{"id":2497,"date":"2025-09-30T15:09:07","date_gmt":"2025-09-30T15:09:07","guid":{"rendered":"https:\/\/productionscrews.com\/"},"modified":"2025-09-30T15:09:07","modified_gmt":"2025-09-30T15:09:07","slug":"expert-guide-steel-annealing-process-explained-from-science-to-solutions","status":"publish","type":"post","link":"https:\/\/productionscrews.com\/vi\/expert-guide-steel-annealing-process-explained-from-science-to-solutions\/","title":{"rendered":"H\u01b0\u1edbng D\u1eabn Chuy\u00ean Gia: Qu\u00e1 Tr\u00ecnh Luy\u1ec7n Kim Th\u00e9p Gi\u1ea3i Th\u00edch \u2013 T\u1eeb Khoa H\u1ecdc \u0111\u1ebfn Gi\u1ea3i Ph\u00e1p"},"content":{"rendered":"<h2>H\u01b0\u1edbng D\u1eabn v\u1ec1 Luy\u1ec7n Kim Th\u00e9p<\/h2>\n<p>Luy\u1ec7n kim th\u00e9p l\u00e0 qu\u00e1 tr\u00ecnh nung n\u00f3ng thay \u0111\u1ed5i c\u1ea5u tr\u00fac nh\u1ecf b\u00ean trong th\u00e9p \u0111\u1ec3 c\u1ea3i thi\u1ec7n c\u00e1ch n\u00f3 ho\u1ea1t \u0111\u1ed9ng. M\u1ee5c ti\u00eau ch\u00ednh c\u1ee7a qu\u00e1 tr\u00ecnh n\u00e0y r\u1ea5t quan tr\u1ecdng trong c\u00f4ng vi\u1ec7c v\u1edbi kim lo\u1ea1i: l\u00e0m cho th\u00e9p d\u1ec5 u\u1ed1n cong h\u01a1n, l\u00e0m m\u1ec1m \u0111\u1ec3 \u0111\u1ecbnh h\u00ecnh, gi\u1ea3m c\u0103ng th\u1eb3ng b\u00ean trong kim lo\u1ea1i, v\u00e0 l\u00e0m cho vi\u1ec7c c\u1eaft d\u1ec5 d\u00e0ng h\u01a1n. N\u1ebfu kh\u00f4ng c\u00f3 qu\u00e1 tr\u00ecnh luy\u1ec7n kim \u0111\u00fang c\u00e1ch, nhi\u1ec1u s\u1ea3n ph\u1ea9m th\u00e9p ch\u00fang ta s\u1eed d\u1ee5ng h\u00e0ng ng\u00e0y\u2014nh\u01b0 b\u1ed9 ph\u1eadn \u00f4 t\u00f4, linh ki\u1ec7n m\u00e1y bay, d\u1ee5ng c\u1ee5 c\u1ea7m tay v\u00e0 d\u1ea7m x\u00e2y d\u1ef1ng\u2014s\u1ebd d\u1ec5 b\u1ecb g\u00e3y, ho\u1ea1t \u0111\u1ed9ng k\u00e9m ho\u1eb7c t\u1ed1n qu\u00e1 nhi\u1ec1u \u0111\u1ec3 s\u1ea3n xu\u1ea5t. \u0110i\u1ec1u n\u00e0y <a href=\"https:\/\/productionscrews.com\/vi\/the-ultimate-guide-to-cold-heading-steel-science-behind-metal-forming\/\"  data-wpil-monitor-id=\"323\" target=\"_blank\">h\u01b0\u1edbng d\u1eabn gi\u1ea3i th\u00edch v\u1ec1<\/a> khoa h\u1ecdc \u0111\u1eb1ng sau luy\u1ec7n kim, ph\u00e2n t\u00edch c\u00e1c quy tr\u00ecnh nh\u00e0 m\u00e1y kh\u00e1c nhau, ch\u1ec9 ra c\u00e1ch ki\u1ec3m so\u00e1t c\u00e1c b\u01b0\u1edbc quan tr\u1ecdng, v\u00e0 cung c\u1ea5p h\u1ed7 tr\u1ee3 th\u1ef1c t\u1ebf \u0111\u1ec3 kh\u1eafc ph\u1ee5c c\u00e1c v\u1ea5n \u0111\u1ec1 ph\u1ed5 bi\u1ebfn. Hi\u1ec3u nh\u1eefng \u00fd t\u01b0\u1edfng n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi b\u1ea5t k\u1ef3 k\u1ef9 s\u01b0 ho\u1eb7c c\u00f4ng nh\u00e2n n\u00e0o mu\u1ed1n th\u00e0nh th\u1ea1o c\u00e1ch c\u00e1c v\u1eadt li\u1ec7u ho\u1ea1t \u0111\u1ed9ng.<\/p>\n<h2>Khoa H\u1ecdc c\u1ee7a Luy\u1ec7n Kim<\/h2>\n<p>\u0110\u1ec3 th\u1ef1c s\u1ef1 hi\u1ec3u luy\u1ec7n kim, ch\u00fang ta c\u1ea7n xem x\u00e9t nh\u1eefng g\u00ec x\u1ea3y ra b\u00ean trong th\u00e9p \u1edf c\u1ea5p \u0111\u1ed9 c\u1ef1c nh\u1ecf. Qu\u00e1 tr\u00ecnh kh\u00f4ng ch\u1ec9 \u0111\u01a1n thu\u1ea7n l\u00e0 nung n\u00f3ng v\u00e0 l\u00e0m ngu\u1ed9i; \u0111\u00f3 l\u00e0 s\u1ef1 thay \u0111\u1ed5i c\u1ea9n th\u1eadn c\u1ea5u tr\u00fac tinh th\u1ec3 c\u1ee7a th\u00e9p. S\u1ef1 thay \u0111\u1ed5i n\u00e0y c\u00f3 th\u1ec3 ph\u00e2n th\u00e0nh ba giai \u0111o\u1ea1n r\u00f5 r\u00e0ng: ph\u1ee5c h\u1ed3i, t\u00e1i k\u1ebft tinh, v\u00e0 ph\u00e1t tri\u1ec3n h\u1ea1t. Th\u00e0nh c\u00f4ng c\u1ee7a b\u1ea5t k\u1ef3 chu tr\u00ecnh luy\u1ec7n kim n\u00e0o ph\u1ee5 thu\u1ed9c v\u00e0o vi\u1ec7c qu\u1ea3n l\u00fd c\u1ea9n th\u1eadn qu\u00e1 tr\u00ecnh di chuy\u1ec3n qua c\u00e1c giai \u0111o\u1ea1n n\u00e0y. H\u00ecnh dung s\u1ef1 thay \u0111\u1ed5i n\u00e0y l\u00e0 ch\u00eca kh\u00f3a; m\u1ed9t s\u01a1 \u0111\u1ed3 \u0111\u01a1n gi\u1ea3n s\u1ebd th\u1ec3 hi\u1ec7n s\u1ef1 chuy\u1ec3n \u0111\u1ed5i t\u1eeb c\u1ea5u tr\u00fac h\u1ea1t xo\u1eafn, k\u00e9o d\u00e0i \u0111\u1eb7c tr\u01b0ng c\u1ee7a th\u00e9p gia c\u00f4ng l\u1ea1nh sang c\u1ea5u tr\u00fac \u0111\u1ed3ng \u0111\u1ec1u, \u0111\u1ec1u sau khi t\u00e1i k\u1ebft tinh th\u00e0nh c\u00f4ng.<\/p>\n<h3>Giai \u0111o\u1ea1n 1: Ph\u1ee5c h\u1ed3i<\/h3>\n<p>Giai \u0111o\u1ea1n \u0111\u1ea7u ti\u00ean, ph\u1ee5c h\u1ed3i, b\u1eaft \u0111\u1ea7u khi th\u00e9p \u0111\u01b0\u1ee3c nung n\u00f3ng. Giai \u0111o\u1ea1n n\u00e0y di\u1ec5n ra \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p h\u01a1n \u0111i\u1ec3m bi\u1ebfn \u0111\u1ed5i quan tr\u1ecdng c\u1ee7a th\u00e9p (A1). M\u1ee5c \u0111\u00edch ch\u00ednh l\u00e0 gi\u1ea3m c\u0103ng th\u1eb3ng. C\u00e1c qu\u00e1 tr\u00ecnh tr\u01b0\u1edbc \u0111\u00f3 <a href=\"https:\/\/productionscrews.com\/vi\/ultimate-guide-to-stud-screw-process-manufacturing-excellence-revealed\/\"  data-wpil-monitor-id=\"326\" target=\"_blank\">quy tr\u00ecnh s\u1ea3n xu\u1ea5t<\/a> nh\u01b0 c\u00e1n ngu\u1ed9i, k\u00e9o ho\u1eb7c r\u00e8n t\u1ea1o ra nhi\u1ec1u khuy\u1ebft t\u1eadt g\u1ecdi l\u00e0 dislocations trong c\u1ea5u tr\u00fac tinh th\u1ec3 c\u1ee7a th\u00e9p. Nh\u1eefng dislocations n\u00e0y gi\u1ed1ng nh\u01b0 nh\u1eefng r\u1ed1i nh\u1ecf l\u00e0m cho v\u1eadt li\u1ec7u c\u1ee9ng v\u00e0 gi\u00f2n.<\/p>\n<p>Trong giai \u0111o\u1ea1n ph\u1ee5c h\u1ed3i, n\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t b\u1ed5 sung cho ph\u00e9p c\u00e1c dislocations di chuy\u1ec3n, s\u1eafp x\u1ebfp l\u1ea1i v\u00e0 h\u1ee7y b\u1ecf l\u1eabn nhau. Qu\u00e1 tr\u00ecnh n\u00e0y gi\u1ea3m \u0111\u00e1ng k\u1ec3 c\u0103ng th\u1eb3ng n\u1ed9i b\u1ed9 t\u00edch t\u1ee5 trong v\u1eadt li\u1ec7u. Tuy nhi\u00ean, c\u1ea5u tr\u00fac h\u1ea1t v\u00e0 ranh gi\u1edbi c\u1ee7a n\u00f3 v\u1eabn ch\u1ee7 y\u1ebfu kh\u00f4ng \u0111\u1ed5i. Do \u0111\u00f3, ph\u1ee5c h\u1ed3i mang l\u1ea1i s\u1ef1 \u1ed5n \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc l\u1edbn h\u01a1n v\u1edbi ch\u1ec9 gi\u1ea3m nh\u1ecf v\u1ec1 \u0111\u1ed9 c\u1ee9ng v\u00e0 \u0111\u1ed9 b\u1ec1n. \u0110\u00e2y l\u00e0 b\u01b0\u1edbc \u201cgi\u1ea3i t\u1ecfa r\u1ed1i\u201d ban \u0111\u1ea7u c\u1ee7a c\u1ea5u tr\u00fac nh\u1ecf tr\u01b0\u1edbc khi c\u00e1c thay \u0111\u1ed5i l\u1edbn h\u01a1n x\u1ea3y ra.<\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-2501\" src=\"https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-Gh2KRL-S2X4.jpg\" alt=\"ng\u01b0\u1eddi c\u1ea7m d\u1ee5ng c\u1ee5 kim lo\u1ea1i m\u00e0u xanh l\u00e1 c\u00e2y v\u00e0 n\u00e2u\" width=\"1600\" height=\"1200\" srcset=\"https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-Gh2KRL-S2X4.jpg 1600w, https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-Gh2KRL-S2X4-300x225.jpg 300w, https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-Gh2KRL-S2X4-768x576.jpg 768w, https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-Gh2KRL-S2X4-1536x1152.jpg 1536w, https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-Gh2KRL-S2X4-16x12.jpg 16w\" sizes=\"(max-width: 1600px) 100vw, 1600px\" \/><\/p>\n<h3>Giai \u0111o\u1ea1n 2: T\u00e1i k\u1ebft tinh<\/h3>\n<p>T\u00e1i k\u1ebft tinh l\u00e0 giai \u0111o\u1ea1n quan tr\u1ecdng nh\u1ea5t c\u1ee7a qu\u00e1 tr\u00ecnh luy\u1ec7n kim v\u00e0 g\u00e2y ra nh\u1eefng thay \u0111\u1ed5i l\u1edbn nh\u1ea5t trong c\u00e1ch v\u1eadt li\u1ec7u ho\u1ea1t \u0111\u1ed9ng. Khi nhi\u1ec7t \u0111\u1ed9 t\u0103ng \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 t\u00e1i k\u1ebft tinh, th\u01b0\u1eddng n\u1eb1m gi\u1eefa 40% v\u00e0 60% c\u1ee7a \u0111i\u1ec3m n\u00f3ng ch\u1ea3y tuy\u1ec7t \u0111\u1ed1i c\u1ee7a th\u00e9p (\u0111\u01b0\u1ee3c \u0111o b\u1eb1ng Kelvin), m\u1ed9t s\u1ef1 thay \u0111\u1ed5i l\u1edbn b\u1eaft \u0111\u1ea7u.<\/p>\n<p>L\u00fac n\u00e0y, c\u00e1c h\u1ea1t m\u1edbi, ho\u00e0n to\u00e0n kh\u00f4ng c\u00f3 c\u0103ng th\u1eb3ng b\u1eaft \u0111\u1ea7u h\u00ecnh th\u00e0nh t\u1ea1i c\u00e1c \u0111i\u1ec3m c\u00f3 n\u0103ng l\u01b0\u1ee3ng n\u1ed9i b\u1ed9 cao, ch\u1eb3ng h\u1ea1n nh\u01b0 ranh gi\u1edbi c\u1ee7a c\u00e1c h\u1ea1t c\u0169 b\u1ecb h\u01b0 h\u1ecfng. C\u00e1c h\u1ea1t m\u1edbi n\u00e0y ph\u00e1t tri\u1ec3n v\u00e0 thay th\u1ebf c\u1ea5u tr\u00fac tinh th\u1ec3 xo\u1eafn ban \u0111\u1ea7u cho \u0111\u1ebfn khi to\u00e0n b\u1ed9 c\u1ea5u tr\u00fac nh\u1ecf \u0111\u00e3 \u0111\u01b0\u1ee3c thay th\u1ebf. K\u1ebft qu\u1ea3 l\u00e0 m\u1ed9t v\u1eadt li\u1ec7u v\u1edbi b\u1ed9 h\u1ea1t m\u1edbi ho\u00e0n to\u00e0n, c\u00f3 k\u00edch th\u01b0\u1edbc \u0111\u1ec1u (g\u1ea7n nh\u01b0 \u0111\u1ec1u nhau theo m\u1ecdi h\u01b0\u1edbng) v\u00e0 kh\u00f4ng c\u00f2n c\u0103ng th\u1eb3ng n\u1ed9i b\u1ed9 t\u1eeb qu\u00e1 tr\u00ecnh gia c\u00f4ng l\u1ea1nh tr\u01b0\u1edbc \u0111\u00f3. \u0110\u00e2y l\u00e0 qu\u00e1 tr\u00ecnh l\u00e0m gi\u1ea3m \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 c\u1ee9ng v\u00e0 \u0111\u1ed9 b\u1ec1n c\u1ee7a th\u00e9p trong khi t\u0103ng kh\u1ea3 n\u0103ng u\u1ed1n cong v\u00e0 \u0111\u1ed9 d\u1ebbo dai, l\u00e0m cho n\u00f3 ph\u00f9 h\u1ee3p \u0111\u1ec3 \u0111\u1ecbnh h\u00ecnh ho\u1eb7c s\u1eed d\u1ee5ng ti\u1ebfp theo.<\/p>\n<h3>Giai \u0111o\u1ea1n 3: Ph\u00e1t tri\u1ec3n h\u1ea1t<\/h3>\n<p>Giai \u0111o\u1ea1n cu\u1ed1i c\u00f9ng, ph\u00e1t tri\u1ec3n h\u1ea1t, x\u1ea3y ra n\u1ebfu th\u00e9p gi\u1eef \u1edf nhi\u1ec7t \u0111\u1ed9 luy\u1ec7n kim qu\u00e1 l\u00e2u sau khi qu\u00e1 tr\u00ecnh t\u00e1i k\u1ebft tinh ho\u00e0n t\u1ea5t, g\u1ecdi l\u00e0 qu\u00e1 ng\u00e2m. Nhi\u1ec7t n\u0103ng ti\u1ebfp t\u1ee5c th\u00fac \u0111\u1ea9y s\u1ef1 thay \u0111\u1ed5i c\u1ea5u tr\u00fac nh\u1ecf, nh\u01b0ng thay v\u00ec h\u00ecnh th\u00e0nh c\u00e1c h\u1ea1t m\u1edbi, c\u00e1c h\u1ea1t \u0111\u00e3 t\u00e1i k\u1ebft tinh b\u1eaft \u0111\u1ea7u h\u1ee3p nh\u1ea5t v\u00e0 l\u1edbn h\u01a1n.<\/p>\n<p>Qu\u00e1 tr\u00ecnh n\u00e0y l\u00e0m gi\u1ea3m th\u00eam \u0111\u1ed9 b\u1ec1n v\u00e0 \u0111\u1ed9 c\u1ee9ng, nh\u01b0ng th\u01b0\u1eddng mang l\u1ea1i k\u1ebft qu\u1ea3 kh\u00f4ng t\u1ed1t. C\u00e1c h\u1ea1t qu\u00e1 l\u1edbn c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn b\u1ec1 m\u1eb7t k\u00e9m ch\u1ea5t l\u01b0\u1ee3ng, th\u00f4 r\u00e1p g\u1ecdi l\u00e0 \u201cv\u1ecf cam\u201d khi v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c \u0111\u1ecbnh h\u00ecnh sau n\u00e0y. Quan tr\u1ecdng h\u01a1n, c\u1ea5u tr\u00fac h\u1ea1t l\u1edbn c\u00f3 th\u1ec3 gi\u1ea3m kh\u1ea3 n\u0103ng ch\u1ed1ng g\u00e3y c\u1ee7a v\u1eadt li\u1ec7u, l\u00e0m cho n\u00f3 d\u1ec5 b\u1ecb h\u1ecfng \u0111\u1ed9t ng\u1ed9t, \u0111\u1eb7c bi\u1ec7t \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p. Do \u0111\u00f3, ki\u1ec3m so\u00e1t s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a h\u1ea1t b\u1eb1ng c\u00e1ch qu\u1ea3n l\u00fd c\u1ea9n th\u1eadn th\u1eddi gian ng\u00e2m v\u00e0 nhi\u1ec7t \u0111\u1ed9 l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng c\u1ee7a chu tr\u00ecnh luy\u1ec7n kim th\u00e0nh c\u00f4ng.<\/p>\n<ul>\n<li>Ph\u1ee5c h\u1ed3i: Gi\u1ea3m c\u0103ng th\u1eb3ng n\u1ed9i b\u1ed9.<\/li>\n<li>T\u00e1i k\u1ebft tinh: H\u00ecnh th\u00e0nh c\u00e1c h\u1ea1t m\u1edbi kh\u00f4ng c\u00f3 c\u0103ng th\u1eb3ng, t\u0103ng kh\u1ea3 n\u0103ng u\u1ed1n cong v\u00e0 m\u1ec1m d\u1ebbo.<\/li>\n<li>Ph\u00e1t tri\u1ec3n h\u1ea1t: L\u00e0m l\u1edbn c\u00e1c h\u1ea1t, c\u00f3 th\u1ec3 gi\u1ea3m \u0111\u1ed9 b\u1ec1n v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng b\u1ec1 m\u1eb7t.<\/li>\n<\/ul>\n<h2>Qu\u00e1 tr\u00ecnh T annealing th\u00e9p<\/h2>\n<p>Annealing\u201d l\u00e0 thu\u1eadt ng\u1eef chung bao g\u1ed3m m\u1ed9t lo\u1ea1t c\u00e1c ph\u01b0\u01a1ng ph\u00e1p nhi\u1ec7t luy\u1ec7n c\u1ee5 th\u1ec3 <a href=\"https:\/\/productionscrews.com\/vi\/ultimate-guide-to-metal-heat-treatment-transform-metal-properties-like-a-pro\/\"  data-wpil-monitor-id=\"327\" target=\"_blank\">qu\u00e1 tr\u00ecnh nhi\u1ec7t luy\u1ec7n<\/a>. Qu\u00e1 tr\u00ecnh ch\u1ecdn l\u1ef1a ph\u1ee5 thu\u1ed9c ho\u00e0n to\u00e0n v\u00e0o th\u00e0nh ph\u1ea7n c\u1ee7a th\u00e9p, tr\u1ea1ng th\u00e1i tr\u01b0\u1edbc khi x\u1eed l\u00fd, v\u00e0 c\u00e1c \u0111\u1eb7c t\u00ednh cu\u1ed1i c\u00f9ng mong mu\u1ed1n. M\u1ed7i qu\u00e1 tr\u00ecnh s\u1eed d\u1ee5ng s\u1ef1 k\u1ebft h\u1ee3p \u0111\u1ed9c \u0111\u00e1o gi\u1eefa nhi\u1ec7t \u0111\u1ed9, th\u1eddi gian gi\u1eef v\u00e0 t\u1ed1c \u0111\u1ed9 l\u00e0m m\u00e1t \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 c\u1ea5u tr\u00fac nh\u1ecf ch\u00ednh x\u00e1c. Hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa c\u00e1c qu\u00e1 tr\u00ecnh n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 ch\u1ecdn \u0111\u00fang ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd ph\u00f9 h\u1ee3p v\u1edbi m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 ph\u00e2n t\u00edch c\u00e1c qu\u00e1 tr\u00ecnh annealing ph\u1ed5 bi\u1ebfn nh\u1ea5t t\u1ea1i nh\u00e0 m\u00e1y.<\/p>\n<h3>L\u00e0m ngu\u1ed9i ho\u00e0n to\u00e0n<\/h3>\n<p>Annealing ho\u00e0n to\u00e0n \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 t\u1ea1o ra tr\u1ea1ng th\u00e1i m\u1ec1m nh\u1ea5t, d\u1ec5 u\u1ed1n v\u00e0 d\u1ec5 gia c\u00f4ng nh\u1ea5t c\u00f3 th\u1ec3 cho th\u00e9p carbon th\u1ea5p v\u00e0 trung b\u00ecnh. Th\u01b0\u1eddng \u0111\u01b0\u1ee3c d\u00f9ng nh\u01b0 b\u01b0\u1edbc chu\u1ea9n b\u1ecb cho c\u00e1c ho\u1ea1t \u0111\u1ed9ng t\u1ea1o h\u00ecnh l\u1ea1nh nghi\u00eam tr\u1ecdng nh\u01b0 k\u00e9o s\u00e2u.<\/p>\n<ul>\n<li>M\u1ee5c ti\u00eau: \u0110\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 m\u1ec1m v\u00e0 kh\u1ea3 n\u0103ng u\u1ed1n t\u1ed1i \u0111a.<\/li>\n<li>Qu\u00e1 tr\u00ecnh: Th\u00e9p \u0111\u01b0\u1ee3c nung \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 kho\u1ea3ng 50\u00b0C (90\u00b0F) cao h\u01a1n nhi\u1ec7t \u0111\u1ed9 t\u1edbi h\u1ea1n tr\u00ean (A3 \u0111\u1ed1i v\u1edbi th\u00e9p hypoeutectoid, Acm \u0111\u1ed1i v\u1edbi th\u00e9p hypereutectoid). N\u00f3 \u0111\u01b0\u1ee3c gi\u1eef \u1edf nhi\u1ec7t \u0111\u1ed9 n\u00e0y \u0111\u1ee7 l\u00e2u \u0111\u1ec3 to\u00e0n b\u1ed9 ph\u1ea7n bi\u1ebfn \u0111\u1ed5i th\u00e0nh pha austenite \u0111\u1ed3ng nh\u1ea5t. Ch\u00eca kh\u00f3a c\u1ee7a qu\u00e1 tr\u00ecnh annealing ho\u00e0n to\u00e0n l\u00e0 qu\u00e1 tr\u00ecnh l\u00e0m m\u00e1t ch\u1eadm r\u1ea5t, th\u01b0\u1eddng l\u00e0 t\u1eaft l\u00f2 nung v\u00e0 \u0111\u1ec3 c\u00e1c b\u1ed9 ph\u1eadn ngu\u1ed9i c\u00f9ng kh\u1ed1i nhi\u1ec7t c\u1ee7a l\u00f2.<\/li>\n<li>K\u1ebft qu\u1ea3: Qu\u00e1 tr\u00ecnh l\u00e0m m\u00e1t ch\u1eadm n\u00e0y cho ph\u00e9p austenite chuy\u1ec3n \u0111\u1ed5i th\u00e0nh c\u1ea5u tr\u00fac nh\u1ecf th\u00f4 c\u1ee7a pearlite v\u00e0 ferrite. C\u1ea5u tr\u00fac th\u00f4 n\u00e0y c\u00f3 \u0111\u1ed9 c\u1ee9ng th\u1ea5p v\u00e0 kh\u1ea3 n\u0103ng u\u1ed1n cao.<\/li>\n<\/ul>\n<p><img decoding=\"async\" src=\"https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-cVjZeA1eEBk.jpg\" height=\"1200\" width=\"801\" class=\"alignnone size-full wp-image-2500\" alt=\"Tia l\u1eeda h\u00e0n bay ra khi kim lo\u1ea1i \u0111\u01b0\u1ee3c nung n\u00f3ng v\u00e0 \u0111\u1ecbnh h\u00ecnh, minh h\u1ecda qu\u00e1 tr\u00ecnh luy\u1ec7n kim th\u00e9p \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong s\u1ea3n xu\u1ea5t v\u00edt v\u00e0 ph\u1ee5 ki\u1ec7n c\u00f4ng nghi\u1ec7p ch\u1ea5t l\u01b0\u1ee3ng cao.\" srcset=\"https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-cVjZeA1eEBk.jpg 801w, https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-cVjZeA1eEBk-200x300.jpg 200w, https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-cVjZeA1eEBk-768x1151.jpg 768w, https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-cVjZeA1eEBk-8x12.jpg 8w\" sizes=\"(max-width: 801px) 100vw, 801px\" \/> <\/p>\n<h3>Annealing qu\u00e1 tr\u00ecnh<\/h3>\n<p>Annealing qu\u00e1 tr\u00ecnh, c\u00f2n g\u1ecdi l\u00e0 annealing trung gian ho\u1eb7c annealing d\u01b0\u1edbi ng\u01b0\u1ee1ng, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 kh\u00f4i ph\u1ee5c kh\u1ea3 n\u0103ng u\u1ed1n cho m\u1ed9t b\u1ed9 ph\u1eadn \u0111\u00e3 \u0111\u01b0\u1ee3c l\u00e0m c\u1ee9ng b\u1eb1ng gia c\u00f4ng l\u1ea1nh. Th\u01b0\u1eddng \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n nh\u01b0 m\u1ed9t b\u01b0\u1edbc trung gian trong qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t nhi\u1ec1u giai \u0111o\u1ea1n, ch\u1eb3ng h\u1ea1n nh\u01b0 <a href=\"https:\/\/productionscrews.com\/vi\/essential-guide-to-wire-drawing-from-metal-rod-to-precision-wire\/\"  data-wpil-monitor-id=\"324\" target=\"_blank\">k\u00e9o d\u00e2y ho\u1eb7c d\u1eadp t\u1ea5m kim lo\u1ea1i<\/a> cho ph\u00e9p u\u1ed1n th\u00eam m\u00e0 kh\u00f4ng b\u1ecb g\u00e3y.<\/p>\n<ul>\n<li>M\u1ee5c ti\u00eau: Kh\u00f4i ph\u1ee5c kh\u1ea3 n\u0103ng u\u1ed1n \u0111\u1ec3 ti\u1ebfp t\u1ee5c gia c\u00f4ng.<\/li>\n<li>Qu\u00e1 tr\u00ecnh: Th\u00e9p \u0111\u01b0\u1ee3c nung \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 ngay d\u01b0\u1edbi nhi\u1ec7t \u0111\u1ed9 t\u1edbi h\u1ea1n th\u1ea5p (A1), th\u01b0\u1eddng trong kho\u1ea3ng 550-650\u00b0C (1022-1202\u00b0F). V\u00ec nhi\u1ec7t \u0111\u1ed9 gi\u1eef d\u01b0\u1edbi \u0111\u01b0\u1eddng A1, kh\u00f4ng x\u1ea3y ra s\u1ef1 bi\u1ebfn \u0111\u1ed5i pha th\u00e0nh austenite. Qu\u00e1 tr\u00ecnh ch\u1ee7 y\u1ebfu li\u00ean quan \u0111\u1ebfn ph\u1ee5c h\u1ed3i v\u00e0 t\u00e1i k\u1ebft tinh pha ferrite. Kh\u00f4ng c\u1ea7n l\u00e0m m\u00e1t ch\u1eadm, c\u00e1c b\u1ed9 ph\u1eadn th\u01b0\u1eddng \u0111\u01b0\u1ee3c l\u00e0m ngu\u1ed9i b\u1eb1ng kh\u00f4ng kh\u00ed.<\/li>\n<li>K\u1ebft qu\u1ea3: Gi\u1ea3m c\u0103ng th\u1eb3ng, c\u1ea5u tr\u00fac h\u1ea1t u\u1ed1n cong \u0111\u01b0\u1ee3c thay th\u1ebf b\u1eb1ng c\u00e1c h\u1ea1t ferrite m\u1edbi c\u00f3 k\u00edch th\u01b0\u1edbc \u0111\u1ec1u nhau, kh\u00f4i ph\u1ee5c kh\u1ea3 n\u0103ng u\u1ed1n v\u1edbi t\u00e1c \u0111\u1ed9ng t\u1ed1i thi\u1ec3u \u0111\u1ebfn th\u00e0nh ph\u1ea7n pha t\u1ed5ng th\u1ec3.<\/li>\n<\/ul>\n<h3>Spheroidizing<\/h3>\n<p>Spheroidizing l\u00e0 qu\u00e1 tr\u00ecnh annealing \u0111\u1eb7c bi\u1ec7t ch\u1ee7 y\u1ebfu \u00e1p d\u1ee5ng cho th\u00e9p carbon cao (th\u01b0\u1eddng &gt;0.61% C) v\u00e0 th\u00e9p d\u1ee5ng c\u1ee5. M\u1ee5c ti\u00eau kh\u00f4ng ch\u1ec9 l\u00e0 l\u00e0m m\u1ec1m m\u00e0 c\u00f2n t\u1ea1o ra c\u1ea5u tr\u00fac nh\u1ecf \u0111\u1eb7c bi\u1ec7t gi\u00fap c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng gia c\u00f4ng tr\u01b0\u1edbc khi th\u00e9p tr\u1ea3i qua chu tr\u00ecnh c\u1ee9ng h\u00f3a v\u00e0 nhi\u1ec7t luy\u1ec7n cu\u1ed1i c\u00f9ng.<\/p>\n<ul>\n<li>M\u1ee5c ti\u00eau: T\u1ea1o ra c\u1ea5u tr\u00fac spheroidite \u0111\u1ec3 t\u1ed1i \u0111a h\u00f3a kh\u1ea3 n\u0103ng gia c\u00f4ng.<\/li>\n<li>Qu\u00e1 tr\u00ecnh: Qu\u00e1 tr\u00ecnh n\u00e0y bao g\u1ed3m nung th\u00e9p \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 ngay d\u01b0\u1edbi ho\u1eb7c quanh nhi\u1ec7t \u0111\u1ed9 t\u1edbi h\u1ea1n th\u1ea5p (A1) trong th\u1eddi gian r\u1ea5t d\u00e0i, th\u01b0\u1eddng t\u1eeb 15 \u0111\u1ebfn 25 gi\u1edd ho\u1eb7c h\u01a1n. Th\u1eddi gian gi\u1eef l\u00e2u n\u00e0y cho ph\u00e9p cementite (carbua s\u1eaft) trong c\u1ea5u tr\u00fac pearlite ph\u00e2n r\u00e3 v\u00e0 h\u00ecnh th\u00e0nh c\u00e1c h\u1ea1t nh\u1ecf, tr\u00f2n ho\u1eb7c spheroids trong m\u1ed9t ma tr\u1eadn ferrite m\u1ec1m.<\/li>\n<li>K\u1ebft qu\u1ea3: C\u1ea5u tr\u00fac spheroidite thu \u0111\u01b0\u1ee3c c\u1ef1c k\u1ef3 m\u1ec1m m\u1ea1i v\u00e0 \u00edt c\u1ea3n tr\u1edf d\u1ee5ng c\u1ee5 c\u1eaft, gi\u00fap th\u00e9p carbon cao kh\u00f3 gia c\u00f4ng tr\u1edf n\u00ean d\u1ec5 x\u1eed l\u00fd h\u01a1n nhi\u1ec1u.<\/li>\n<\/ul>\n<h3>L\u00e0m m\u1ec1m gi\u1ea3m \u1ee9ng su\u1ea5t<\/h3>\n<p>L\u00e0m m\u1ec1m gi\u1ea3m \u1ee9ng su\u1ea5t l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh nhi\u1ec7t \u0111\u1ed9 th\u1ea5p ch\u1ec9 nh\u1eb1m m\u1ee5c \u0111\u00edch gi\u1ea3m thi\u1ec3u c\u00e1c \u1ee9ng su\u1ea5t n\u1ed9i sinh b\u1ecb kh\u00f3a trong th\u00e0nh ph\u1ea7n do c\u00e1c qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t tr\u01b0\u1edbc \u0111\u00f3 nh\u01b0 h\u00e0n, gia c\u00f4ng n\u1eb7ng, \u0111\u00fac ho\u1eb7c th\u1eadm ch\u00ed l\u00e0m ngu\u1ed9i nhanh. Nh\u1eefng \u1ee9ng su\u1ea5t n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn s\u1ef1 kh\u00f4ng \u1ed5n \u0111\u1ecbnh v\u1ec1 k\u00edch th\u01b0\u1edbc, bi\u1ebfn d\u1ea1ng theo th\u1eddi gian ho\u1eb7c h\u1ecfng s\u1edbm.<\/p>\n<ul>\n<li>M\u1ee5c ti\u00eau: Gi\u1ea3m thi\u1ec3u \u1ee9ng su\u1ea5t n\u1ed9i sinh v\u1edbi s\u1ef1 thay \u0111\u1ed5i t\u1ed1i thi\u1ec3u v\u1ec1 \u0111\u1eb7c t\u00ednh c\u01a1 h\u1ecdc.<\/li>\n<li>Quy tr\u00ecnh: Ph\u1ea7n \u0111\u01b0\u1ee3c nung \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 th\u1ea5p h\u01a1n nhi\u1ec1u so v\u1edbi \u0111i\u1ec3m t\u1edbi h\u1ea1n th\u1ea5p (A1), th\u01b0\u1eddng t\u1eeb 480-650\u00b0C (900-1200\u00b0F). N\u00f3 \u0111\u01b0\u1ee3c gi\u1eef \u1edf nhi\u1ec7t \u0111\u1ed9 n\u00e0y \u0111\u1ee7 l\u00e2u \u0111\u1ec3 th\u00e0nh ph\u1ea7n \u0111\u01b0\u1ee3c nung \u0111\u1ec1u, cho ph\u00e9p gi\u1ea3m \u1ee9ng su\u1ea5t th\u00f4ng qua qu\u00e1 tr\u00ecnh ph\u1ee5c h\u1ed3i. Sau \u0111\u00f3, ph\u1ea7n ph\u1ea3i \u0111\u01b0\u1ee3c l\u00e0m ngu\u1ed9i ch\u1eadm \u0111\u1ec3 tr\u00e1nh t\u1ea1o ra c\u00e1c \u1ee9ng su\u1ea5t nhi\u1ec7t m\u1edbi.<\/li>\n<li>K\u1ebft qu\u1ea3: Th\u00e0nh ph\u1ea7n tr\u1edf n\u00ean \u1ed5n \u0111\u1ecbnh v\u1ec1 k\u00edch th\u01b0\u1edbc h\u01a1n v\u00e0 \u00edt c\u00f3 kh\u1ea3 n\u0103ng b\u1ecb bi\u1ebfn d\u1ea1ng ho\u1eb7c n\u1ee9t, v\u1edbi \u00edt ho\u1eb7c kh\u00f4ng thay \u0111\u1ed5i v\u1ec1 \u0111\u1ed9 c\u1ee9ng ho\u1eb7c \u0111\u1ed9 b\u1ec1n.<\/li>\n<\/ul>\n<h3>B\u1ea3ng 1: Ph\u00e2n t\u00edch so s\u00e1nh c\u00e1c qu\u00e1 tr\u00ecnh l\u00e0m m\u1ec1m th\u00e9p ch\u00ednh<\/h3>\n<table>\n<tbody>\n<tr>\n<td width=\"96\">Lo\u1ea1i quy tr\u00ecnh<\/td>\n<td width=\"96\">Ph\u1ea1m vi nhi\u1ec7t \u0111\u1ed9 \u0111i\u1ec3n h\u00ecnh (li\u00ean quan \u0111\u1ebfn A1, A3)<\/td>\n<td width=\"96\">Ph\u01b0\u01a1ng ph\u00e1p l\u00e0m m\u00e1t<\/td>\n<td width=\"96\">C\u1ea5u tr\u00fac vi m\u00f4 sau khi x\u1eed l\u00fd<\/td>\n<td width=\"96\">Thay \u0111\u1ed5i ch\u00ednh v\u1ec1 \u0111\u1eb7c t\u00ednh<\/td>\n<td width=\"96\">Ph\u00f9 h\u1ee3p cho (\u1ee9ng d\u1ee5ng)<\/td>\n<\/tr>\n<tr>\n<td width=\"96\">L\u00e0m ngu\u1ed9i ho\u00e0n to\u00e0n<\/td>\n<td width=\"96\">Tr\u00ean A3\/Acm<\/td>\n<td width=\"96\">R\u1ea5t ch\u1eadm (L\u00e0m m\u00e1t trong l\u00f2 nung)<\/td>\n<td width=\"96\">Perlite th\u00f4 &amp; S\u1eaft t\u1eeb<\/td>\n<td width=\"96\">\u0110\u1ed9 m\u1ec1m t\u1ed1i \u0111a &amp; kh\u1ea3 n\u0103ng u\u1ed1n cong<\/td>\n<td width=\"96\">Chu\u1ea9n b\u1ecb cho th\u00e9p th\u1ea5p\/trung b\u00ecnh <a href=\"https:\/\/productionscrews.com\/vi\/carbon-steel-screws\/\"  data-wpil-monitor-id=\"328\" target=\"_blank\">th\u00e9p carbon<\/a> cho c\u00e1c qu\u00e1 tr\u00ecnh t\u1ea1o h\u00ecnh l\u1ea1nh nghi\u00eam tr\u1ecdng.<\/td>\n<\/tr>\n<tr>\n<td width=\"96\">Annealing qu\u00e1 tr\u00ecnh<\/td>\n<td width=\"96\">D\u01b0\u1edbi A1<\/td>\n<td width=\"96\">L\u00e0m m\u00e1t b\u1eb1ng kh\u00ed ho\u1eb7c trong l\u00f2 nung<\/td>\n<td width=\"96\">Ferro recrystallized<\/td>\n<td width=\"96\">Kh\u00f4i ph\u1ee5c kh\u1ea3 n\u0103ng u\u1ed1n cong<\/td>\n<td width=\"96\">Trong c\u00e1c b\u01b0\u1edbc trung gian c\u1ee7a qu\u00e1 tr\u00ecnh k\u00e9o ho\u1eb7c d\u1eadp nhi\u1ec1u giai \u0111o\u1ea1n.<\/td>\n<\/tr>\n<tr>\n<td width=\"96\">Spheroidizing<\/td>\n<td width=\"96\">Kho\u1ea3ng A1 (gi\u1eef l\u00e2u)<\/td>\n<td width=\"96\">L\u00e0m m\u00e1t ch\u1eadm<\/td>\n<td width=\"96\">H\u00ecnh c\u1ea7u (h\u00ecnh c\u1ea7u cementite trong Ferrite)<\/td>\n<td width=\"96\">Kh\u1ea3 n\u0103ng l\u00e0m vi\u1ec7c t\u1ed1i \u0111a<\/td>\n<td width=\"96\">Chu\u1ea9n b\u1ecb th\u00e9p cacbon cao (&gt;0,6% C) v\u00e0 th\u00e9p d\u1ee5ng c\u1ee5 \u0111\u1ec3 gia c\u00f4ng.<\/td>\n<\/tr>\n<tr>\n<td width=\"96\">Gi\u1ea3m c\u0103ng th\u1eb3ng<\/td>\n<td width=\"96\">R\u1ea5t th\u1ea5p d\u01b0\u1edbi A1<\/td>\n<td width=\"96\">L\u00e0m m\u00e1t ch\u1eadm<\/td>\n<td width=\"96\">Martensit t\u00f4i luy\u1ec7n (n\u1ebfu t\u00f4i c\u1ee9ng) ho\u1eb7c kh\u00f4ng \u0111\u1ed5i<\/td>\n<td width=\"96\">Gi\u1ea3m thi\u1ec3u \u1ee9ng su\u1ea5t n\u1ed9i b\u1ed9<\/td>\n<td width=\"96\">\u1ed4n \u0111\u1ecbnh c\u00e1c k\u1ebft c\u1ea5u v\u1ea3i h\u00e0n, b\u1ed9 ph\u1eadn \u0111\u00fac ho\u1eb7c c\u00e1c th\u00e0nh ph\u1ea7n gia c\u00f4ng n\u1eb7ng.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>\u0110i\u1ec1u khi\u1ec3n c\u00e1c th\u00f4ng s\u1ed1 quy tr\u00ecnh<\/h2>\n<p>Luy\u1ec7n anne th\u00e0nh c\u00f4ng l\u00e0 m\u1ed9t khoa h\u1ecdc c\u1ee7a vi\u1ec7c ki\u1ec3m so\u00e1t ch\u00ednh x\u00e1c. Nh\u1eefng thay \u0111\u1ed5i nh\u1ecf trong b\u1ea5t k\u1ef3 bi\u1ebfn s\u1ed1 ch\u00ednh n\u00e0o c\u1ee7a qu\u00e1 tr\u00ecnh c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn c\u00e1c c\u1ea5u tr\u00fac nh\u1ecf v\u00e0 \u0111\u1eb7c t\u00ednh c\u01a1 h\u1ecdc r\u1ea5t kh\u00e1c nhau, g\u00e2y ra c\u00e1c b\u1ed9 ph\u1eadn b\u1ecb l\u1ed7i v\u00e0 l\u00e3ng ph\u00ed v\u1eadt li\u1ec7u. Ba tr\u1ee5 c\u1ed9t c\u1ee7a vi\u1ec7c ki\u1ec3m so\u00e1t trong b\u1ea5t k\u1ef3 chu tr\u00ecnh anne n\u00e0o l\u00e0 nhi\u1ec7t \u0111\u1ed9, th\u1eddi gian ng\u00e2m v\u00e0 t\u1ed1c \u0111\u1ed9 l\u00e0m m\u00e1t. L\u00e0m ch\u1ee7 c\u00e1c bi\u1ebfn s\u1ed1 n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 nh\u1ea5t qu\u00e1n v\u00e0 d\u1ef1 \u0111o\u00e1n \u0111\u01b0\u1ee3c.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/pixabay-6967964.jpg\" height=\"853\" width=\"1280\" class=\"alignnone size-full wp-image-2499\" alt=\"\u1ed0ng th\u00e9p \u0111en x\u1ebfp ch\u1ed3ng th\u00e0nh t\u1eebng b\u00f3 b\u00ean ngo\u00e0i c\u01a1 s\u1edf s\u1ea3n xu\u1ea5t, s\u1eb5n s\u00e0ng cho c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p v\u00e0 ph\u00e2n ph\u1ed1i.\" srcset=\"https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/pixabay-6967964.jpg 1280w, https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/pixabay-6967964-300x200.jpg 300w, https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/pixabay-6967964-768x512.jpg 768w, https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/pixabay-6967964-18x12.jpg 18w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/> <\/p>\n<h3>Vai tr\u00f2 c\u1ee7a nhi\u1ec7t \u0111\u1ed9<\/h3>\n<p>Nhi\u1ec7t \u0111\u1ed9 c\u00f3 l\u1ebd l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng nh\u1ea5t trong b\u1ea5t k\u1ef3 <a href=\"https:\/\/productionscrews.com\/vi\/5-secrets-of-heat-treatment-process-engineering-metal-properties-revealed\/\"  data-wpil-monitor-id=\"322\" target=\"_blank\">gia c\u00f4ng nhi\u1ec7t<\/a>N\u00f3 quy\u1ebft \u0111\u1ecbnh c\u00e1c pha bi\u1ebfn \u0111\u1ed5i x\u1ea3y ra v\u00e0 c\u1ea5u tr\u00fac nh\u1ecf cu\u1ed1i c\u00f9ng c\u1ee7a th\u00e9p. B\u1ea3n \u0111\u1ed3 pha s\u1eaft-Carbon \u0111\u00f3ng vai tr\u00f2 nh\u01b0 b\u1ea3n \u0111\u1ed3 \u0111\u01b0\u1eddng \u0111i c\u1ee7a nh\u00e0 luy\u1ec7n kim, x\u00e1c \u0111\u1ecbnh r\u00f5 c\u00e1c nhi\u1ec7t \u0111\u1ed9 t\u1edbi h\u1ea1n (A1, A3, Acm) t\u1ea1i \u0111\u00f3 c\u00e1c thay \u0111\u1ed5i n\u00e0y b\u1eaft \u0111\u1ea7u v\u00e0 k\u1ebft th\u00fac cho c\u00e1c h\u00e0m l\u01b0\u1ee3ng carbon kh\u00e1c nhau.<\/p>\n<p>L\u00e0m n\u00f3ng \u0111\u1ebfn m\u1ee9c th\u1ea5p h\u01a1n A1 gi\u00fap gi\u1ea3m c\u0103ng th\u1eb3ng v\u00e0 recrystallization m\u00e0 kh\u00f4ng x\u1ea3y ra s\u1ef1 bi\u1ebfn \u0111\u1ed5i pha. L\u00e0m n\u00f3ng tr\u00ean A3 ho\u1eb7c Acm \u0111\u1ec3 th\u1ef1c hi\u1ec7n qu\u00e1 tr\u00ecnh \u1ee7 ho\u00e0n to\u00e0n \u0111\u1ea3m b\u1ea3o s\u1ef1 chuy\u1ec3n \u0111\u1ed5i ho\u00e0n to\u00e0n th\u00e0nh austenite. Vi\u1ec7c ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ed9 ch\u00ednh x\u00e1c l\u00e0 c\u1ea7n thi\u1ebft. \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n l\u00f2 nung \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp ch\u00ednh x\u00e1c, c\u00e1c thi\u1ebft b\u1ecb \u0111o nhi\u1ec7t \u0111\u1ed9 v\u00e0 thermocouple. \u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng quan tr\u1ecdng, thermocouple n\u00ean \u0111\u01b0\u1ee3c \u0111\u1eb7t tr\u1ef1c ti\u1ebfp tr\u00ean chi ti\u1ebft gia c\u00f4ng ho\u1eb7c m\u1ed9t m\u1eabu th\u1eed \u0111\u1ea1i di\u1ec7n, kh\u00f4ng ch\u1ec9 \u0111o kh\u00f4ng kh\u00ed xung quanh l\u00f2 nung, \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o ph\u1ea7n chi ti\u1ebft \u0111\u1ea1t \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 m\u1ee5c ti\u00eau.<\/p>\n<h3>T\u1ea7m quan tr\u1ecdng c\u1ee7a Th\u1eddi gian ng\u00e2m<\/h3>\n<p>Khi th\u00e9p \u0111\u1ea1t \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 \u1ee7 m\u1ee5c ti\u00eau, n\u00f3 ph\u1ea3i \u0111\u01b0\u1ee3c gi\u1eef \u1edf \u0111\u00f3 trong m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh. \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 th\u1eddi gian ng\u00e2m ho\u1eb7c gi\u1eef nhi\u1ec7t. M\u1ee5c \u0111\u00edch c\u1ee7a vi\u1ec7c ng\u00e2m l\u00e0 hai m\u1ee5c \u0111\u00edch: th\u1ee9 nh\u1ea5t, \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o nhi\u1ec7t \u0111\u1ed9 \u0111\u1ec1u kh\u1eafp to\u00e0n b\u1ed9 m\u1eb7t c\u1eaft c\u1ee7a chi ti\u1ebft, t\u1eeb b\u1ec1 m\u1eb7t \u0111\u1ebfn l\u00f5i; v\u00e0 th\u1ee9 hai, \u0111\u1ec3 \u0111\u1ee7 th\u1eddi gian cho c\u00e1c bi\u1ebfn \u0111\u1ed5i kim lo\u1ea1i h\u1ecdc mong mu\u1ed1n, nh\u01b0 austenit h\u00f3a ho\u1eb7c recrystallization, ho\u00e0n t\u1ea5t.<\/p>\n<p>Th\u1eddi gian ng\u00e2m ch\u1ee7 y\u1ebfu d\u1ef1a tr\u00ean \u0111\u1ed9 d\u00e0y t\u1ed1i \u0111a c\u1ee7a b\u1ed9 ph\u1eadn. Ng\u00e2m kh\u00f4ng \u0111\u1ee7 s\u1ebd d\u1eabn \u0111\u1ebfn s\u1ef1 bi\u1ebfn \u0111\u1ed5i kh\u00f4ng ho\u00e0n ch\u1ec9nh, g\u00e2y ra c\u1ea5u tr\u00fac kh\u00f4ng \u0111\u1ec1u v\u00e0 c\u00e1c \u0111i\u1ec3m c\u1ee9ng. H\u01b0\u1edbng d\u1eabn chung l\u00e0 ng\u00e2m trong 1 gi\u1edd cho m\u1ed7i inch (25mm) \u0111\u1ed9 d\u00e0y, v\u1edbi t\u1ed1i thi\u1ec3u 30 ph\u00fat cho c\u00e1c b\u1ed9 ph\u1eadn m\u1ecfng h\u01a1n. Tuy nhi\u00ean, \u0111\u00e2y ch\u1ec9 l\u00e0 \u0111i\u1ec3m kh\u1edfi \u0111\u1ea7u, v\u00e0 th\u1eddi gian t\u1ed1i \u01b0u c\u00f3 th\u1ec3 thay \u0111\u1ed5i d\u1ef1a tr\u00ean hi\u1ec7u qu\u1ea3 c\u1ee7a l\u00f2 nung, m\u1eadt \u0111\u1ed9 t\u1ea3i v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 c\u1ee5 th\u1ec3. <a href=\"https:\/\/productionscrews.com\/vi\/ultimate-guide-alloy-steel-screws-raw-material-selection-for-maximum-strength\/\"  data-wpil-monitor-id=\"325\" target=\"_blank\">h\u1ee3p kim th\u00e9p<\/a>.<\/p>\n<h3>\u1ea2nh h\u01b0\u1edfng c\u1ee7a t\u1ed1c \u0111\u1ed9 l\u00e0m m\u00e1t<\/h3>\n<p>T\u1ed1c \u0111\u1ed9 l\u00e0m ngu\u1ed9i th\u00e9p t\u1eeb nhi\u1ec7t \u0111\u1ed9 \u1ee7 l\u00e0 y\u1ebfu t\u1ed1 quy\u1ebft \u0111\u1ecbnh ph\u00e2n bi\u1ec7t qu\u00e1 tr\u00ecnh \u1ee7 v\u1edbi c\u00e1c ph\u01b0\u01a1ng ph\u00e1p nhi\u1ec7t luy\u1ec7n kh\u00e1c nh\u01b0 t\u00f4i luy\u1ec7n ho\u1eb7c t\u00f4i nhi\u1ec7t. T\u1ed1c \u0111\u1ed9 l\u00e0m ngu\u1ed9i \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn c\u1ea5u tr\u00fac nh\u1ecf cu\u1ed1i c\u00f9ng h\u00ecnh th\u00e0nh t\u1eeb pha austenit.<\/p>\n<ul>\n<li>L\u00e0m ngu\u1ed9i ho\u00e0n to\u00e0n: T\u1ed1c \u0111\u1ed9 l\u00e0m ngu\u1ed9i r\u1ea5t ch\u1eadm, \u0111\u1ea1t \u0111\u01b0\u1ee3c b\u1eb1ng c\u00e1ch \u0111\u1ec3 chi ti\u1ebft trong l\u00f2 nung khi n\u00f3 ngu\u1ed9i \u0111i, cho ph\u00e9p \u0111\u1ee7 th\u1eddi gian \u0111\u1ec3 carbon di chuy\u1ec3n. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn s\u1ef1 h\u00ecnh th\u00e0nh c\u1ee7a c\u00e1c c\u1ea5u tr\u00fac m\u1ec1m, th\u00f4 nh\u01b0 perlite v\u00e0 ferrite.<\/li>\n<li>Chu\u1ea9n h\u00f3a (\u0111\u1ec3 t\u1ea1o \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n): T\u1ed1c \u0111\u1ed9 l\u00e0m ngu\u1ed9i v\u1eeba ph\u1ea3i, ch\u1eb3ng h\u1ea1n nh\u01b0 l\u00e0m ngu\u1ed9i trong kh\u00f4ng kh\u00ed y\u00ean t\u0129nh, \u00edt th\u1eddi gian h\u01a1n cho s\u1ef1 di chuy\u1ec3n. \u0110i\u1ec1u n\u00e0y d\u1eabn \u0111\u1ebfn c\u1ea5u tr\u00fac perlite m\u1ecbn h\u01a1n, \u0111\u1ed3ng \u0111\u1ec1u h\u01a1n, c\u00f3 \u0111\u1ed9 c\u1ee9ng v\u00e0 \u0111\u1ed9 b\u1ec1n cao h\u01a1n m\u1ed9t ch\u00fat so v\u1edbi c\u1ea5u tr\u00fac \u0111\u00e3 \u0111\u01b0\u1ee3c l\u00e0m ngu\u1ed9i ho\u00e0n to\u00e0n.<\/li>\n<li>L\u00e0m c\u1ee9ng (\u0111\u1ec3 t\u1ea1o \u0111\u1ed9 t\u01b0\u01a1ng ph\u1ea3n): T\u1ed1c \u0111\u1ed9 l\u00e0m ngu\u1ed9i c\u1ef1c k\u1ef3 nhanh, \u0111\u1ea1t \u0111\u01b0\u1ee3c b\u1eb1ng c\u00e1ch nh\u00fang chi ti\u1ebft v\u00e0o n\u01b0\u1edbc ho\u1eb7c d\u1ea7u, ng\u0103n ch\u1eb7n ho\u00e0n to\u00e0n s\u1ef1 di chuy\u1ec3n. \u0110i\u1ec1u n\u00e0y gi\u1eef carbon trong m\u1ea1ng tinh th\u1ec3 xo\u1eafn, h\u00ecnh th\u00e0nh martensite, m\u1ed9t pha c\u1ef1c k\u1ef3 c\u1ee9ng v\u00e0 gi\u00f2n.<\/li>\n<\/ul>\n<p>Vi\u1ec7c l\u00e0m ngu\u1ed9i ch\u1eadm, ki\u1ec3m so\u00e1t c\u1ee7a qu\u00e1 tr\u00ecnh l\u00e0m ngu\u1ed9i ho\u00e0n to\u00e0n l\u00e0 \u0111i\u1ec1u \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 m\u1ec1m m\u1ea1i v\u00e0 d\u1ec5 u\u1ed1n t\u1ed1i \u0111a.<\/p>\n<h3>B\u1ea3ng 2: Tham s\u1ed1 \u0111\u1ec1 xu\u1ea5t cho qu\u00e1 tr\u00ecnh l\u00e0m ngu\u1ed9i ho\u00e0n to\u00e0n c\u00e1c lo\u1ea1i th\u00e9p ph\u1ed5 bi\u1ebfn<\/h3>\n<table>\n<tbody>\n<tr>\n<td width=\"115\">Lo\u1ea1i th\u00e9p (AISI\/SAE)<\/td>\n<td width=\"115\">Quy tr\u00ecnh ph\u1ed5 bi\u1ebfn<\/td>\n<td width=\"115\">Nhi\u1ec7t \u0111\u1ed9 nung (\u00b0C \/ \u00b0F)<\/td>\n<td width=\"115\">Th\u1eddi gian ng\u00e2m t\u1ed1i thi\u1ec3u (theo inch)<\/td>\n<td width=\"115\">Ph\u01b0\u01a1ng ph\u00e1p l\u00e0m ngu\u1ed9i \u0111\u1ec1 xu\u1ea5t<\/td>\n<\/tr>\n<tr>\n<td width=\"115\">1018 (Carbon th\u1ea5p)<\/td>\n<td width=\"115\">L\u00e0m ngu\u1ed9i ho\u00e0n to\u00e0n<\/td>\n<td width=\"115\">870-910\u00b0C \/ 1600-1670\u00b0F<\/td>\n<td width=\"115\">1 gi\u1edd<\/td>\n<td width=\"115\">L\u00e0m ngu\u1ed9i trong l\u00f2 \u1edf &lt; 50\u00b0C\/gi\u1edd<\/td>\n<\/tr>\n<tr>\n<td width=\"115\">1045 (Carbon trung b\u00ecnh)<\/td>\n<td width=\"115\">L\u00e0m ngu\u1ed9i ho\u00e0n to\u00e0n<\/td>\n<td width=\"115\">L\u00e0m ngu\u1ed9i ho\u00e0n to\u00e0n<\/td>\n<td width=\"115\">1 gi\u1edd<\/td>\n<td width=\"115\">800-840\u00b0C \/ 1475-1550\u00b0F<\/td>\n<\/tr>\n<tr>\n<td width=\"115\">4140 (<a href=\"https:\/\/productionscrews.com\/vi\/ultimate-guide-alloy-steel-screws-material-selection-and-best-practices-2024\/\"  data-wpil-monitor-id=\"329\" target=\"_blank\">Th\u00e9p h\u1ee3p kim<\/a>)<\/td>\n<td width=\"115\">L\u00e0m ngu\u1ed9i ho\u00e0n to\u00e0n<\/td>\n<td width=\"115\">L\u00e0m ngu\u1ed9i trong l\u00f2 \u1edf &lt; 40\u00b0C\/gi\u1edd<\/td>\n<td width=\"115\">1 gi\u1edd<\/td>\n<td width=\"115\">840-870\u00b0C \/ 1550-1600\u00b0F<\/td>\n<\/tr>\n<tr>\n<td width=\"115\">Th\u00e9p d\u1ee5ng c\u1ee5 O1<\/td>\n<td width=\"115\">Luy\u1ec7n quang h\u1ee3p d\u1ea1ng c\u1ea7u<\/td>\n<td width=\"115\">740-760\u00b0C \/ 1360-1400\u00b0F<\/td>\n<td width=\"115\">2-4 gi\u1edd<\/td>\n<td width=\"115\">L\u00e0m m\u00e1t ch\u1eadm r\u1ea5t ch\u1eadm (&lt; 10\u00b0C\/gi\u1edd)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>X\u1eed l\u00fd s\u1ef1 c\u1ed1 trong qu\u00e1 tr\u00ecnh \u1ee7<\/h2>\n<p>Ngay c\u1ea3 v\u1edbi c\u00e1c quy tr\u00ecnh r\u00f5 r\u00e0ng, c\u00e1c v\u1ea5n \u0111\u1ec1 c\u00f3 th\u1ec3 ph\u00e1t sinh trong qu\u00e1 tr\u00ecnh \u1ee7. Vi\u1ec7c ph\u00e1t hi\u1ec7n v\u00e0 kh\u1eafc ph\u1ee5c nh\u1eefng v\u1ea5n \u0111\u1ec1 n\u00e0y \u0111\u00f2i h\u1ecfi hi\u1ec3u bi\u1ebft v\u1eefng ch\u1eafc v\u1ec1 c\u00e1c nguy\u00ean t\u1eafc kim lo\u1ea1i h\u1ecdc n\u1ec1n t\u1ea3ng. Trong x\u01b0\u1edfng, m\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 ph\u1ed5 bi\u1ebfn c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m ch\u1ea5t l\u01b0\u1ee3ng c\u00e1c th\u00e0nh ph\u1ea7n \u0111\u00e3 \u1ee7. M\u1ed9t th\u00e1ch th\u1ee9c th\u01b0\u1eddng g\u1eb7p c\u1ee7a c\u00e1c nh\u00e0 kim lo\u1ea1i h\u1ecdc l\u00e0 c\u00e2n b\u1eb1ng c\u00e1c y\u1ebfu t\u1ed1 quy tr\u00ecnh \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c c\u00e1c \u0111\u1eb7c t\u00ednh mong mu\u1ed1n m\u00e0 kh\u00f4ng t\u1ea1o ra c\u00e1c l\u1ed7i m\u1edbi. Ph\u1ea7n n\u00e0y cung c\u1ea5p h\u01b0\u1edbng d\u1eabn d\u1ef1a tr\u00ean kinh nghi\u1ec7m \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh v\u00e0 gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 th\u1ef1c t\u1ebf n\u00e0y.<\/p>\n<h3>M\u1ec1m h\u00f3a kh\u00f4ng ho\u00e0n ch\u1ec9nh<\/h3>\n<p>M\u1ed9t trong nh\u1eefng l\u1ed7i ph\u1ed5 bi\u1ebfn nh\u1ea5t trong qu\u00e1 tr\u00ecnh \u1ee7 l\u00e0 ph\u00e1t hi\u1ec7n th\u00e9p kh\u00f4ng m\u1ec1m nh\u01b0 mong \u0111\u1ee3i ho\u1eb7c c\u00f3 c\u00e1c \u0111i\u1ec3m c\u1ee9ng. \u0110i\u1ec1u n\u00e0y cho th\u1ea5y s\u1ef1 thay \u0111\u1ed5i c\u1ea5u tr\u00fac nh\u1ecf mong mu\u1ed1n ch\u01b0a ho\u00e0n th\u00e0nh \u0111\u1ea7y \u0111\u1ee7.<\/p>\n<ul>\n<li>Nguy\u00ean nh\u00e2n:<\/li>\n<li>Nhi\u1ec7t \u0111\u1ed9 \u1ee7 qu\u00e1 th\u1ea5p. V\u1eadt li\u1ec7u c\u00f3 th\u1ec3 ch\u01b0a ho\u00e0n to\u00e0n v\u00e0o ph\u1ea1m vi t\u00e1i k\u1ebft tinh ho\u1eb7c austenit h\u00f3a.<\/li>\n<li>Th\u1eddi gian ng\u00e2m kh\u00f4ng \u0111\u1ee7. Ph\u1ea7n l\u00f5i c\u1ee7a m\u1ed9t b\u1ed9 ph\u1eadn d\u00e0y c\u00f3 th\u1ec3 ch\u01b0a \u0111\u1ea1t \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 m\u1ee5c ti\u00eau ho\u1eb7c ch\u01b0a \u0111\u1ee7 th\u1eddi gian \u0111\u1ec3 thay \u0111\u1ed5i.<\/li>\n<li>\u0110o nhi\u1ec7t \u0111\u1ed9 kh\u00f4ng ch\u00ednh x\u00e1c. M\u1ed9t c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 k\u00e9m ch\u1ea5t l\u01b0\u1ee3ng ho\u1eb7c \u0111\u1eb7t kh\u00f4ng \u0111\u00fang v\u1ecb tr\u00ed trong l\u00f2 c\u00f3 th\u1ec3 cho k\u1ebft qu\u1ea3 \u0111\u1ecdc sai, khi\u1ebfn nhi\u1ec7t \u0111\u1ed9 th\u1ef1c t\u1ebf c\u1ee7a b\u1ed9 ph\u1eadn th\u1ea5p h\u01a1n so v\u1edbi \u0111i\u1ec3m \u0111\u1eb7t.<\/li>\n<li>D\u1ea3i h\u1ee3p kim ph\u00e2n t\u00e1ch. Trong m\u1ed9t s\u1ed1 th\u00e9p, s\u1ef1 ph\u00e2n t\u00e1ch c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim c\u00f3 th\u1ec3 t\u1ea1o th\u00e0nh c\u00e1c d\u1ea3i ch\u1ed1ng m\u1ec1m h\u00f3a \u1edf nhi\u1ec7t \u0111\u1ed9 \u1ee7 th\u00f4ng th\u01b0\u1eddng.<\/li>\n<li>Gi\u1ea3i ph\u00e1p:<\/li>\n<li>Ki\u1ec3m tra hi\u1ec7u chu\u1ea9n c\u1ee7a t\u1ea5t c\u1ea3 c\u00e1c thi\u1ebft b\u1ecb \u0111o nhi\u1ec7t \u0111\u1ed9 l\u00f2 v\u00e0 c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9.<\/li>\n<li>T\u0103ng \u0111i\u1ec3m \u0111\u1eb7t nhi\u1ec7t \u0111\u1ed9 c\u1ee7a l\u00f2 \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o n\u1eb1m trong ph\u1ea1m vi khuy\u1ebfn ngh\u1ecb cho lo\u1ea1i th\u00e9p c\u1ee5 th\u1ec3.<\/li>\n<li>T\u0103ng th\u1eddi gian ng\u00e2m d\u1ef1a tr\u00ean ti\u1ebft di\u1ec7n l\u1edbn nh\u1ea5t c\u1ee7a b\u1ed9 ph\u1eadn.<\/li>\n<li>\u0110\u1ea3m b\u1ea3o t\u1ea3i l\u00f2 \u0111\u00fang c\u00e1ch \u0111\u1ec3 cho ph\u00e9p tu\u1ea7n ho\u00e0n nhi\u1ec7t \u0111\u1ec1u quanh t\u1ea5t c\u1ea3 c\u00e1c b\u1ed9 ph\u1eadn.<\/li>\n<\/ul>\n<h3>T\u0103ng tr\u01b0\u1edfng h\u1ea1t qu\u00e1 m\u1ee9c<\/h3>\n<p>Nh\u01b0 \u0111\u00e3 th\u1ea3o lu\u1eadn tr\u01b0\u1edbc \u0111\u00f3, gi\u1eef th\u00e9p \u1edf nhi\u1ec7t \u0111\u1ed9 \u1ee7 qu\u00e1 l\u00e2u ho\u1eb7c \u1edf nhi\u1ec7t \u0111\u1ed9 qu\u00e1 cao c\u00f3 th\u1ec3 khi\u1ebfn c\u00e1c h\u1ea1t m\u1edbi h\u00ecnh th\u00e0nh ph\u00e1t tri\u1ec3n qu\u00e1 l\u1edbn.<\/p>\n<ul>\n<li>H\u1eadu qu\u1ea3: L\u1ed7i n\u00e0y g\u00e2y h\u1ea1i cho hi\u1ec7u su\u1ea5t cu\u1ed1i c\u00f9ng c\u1ee7a chi ti\u1ebft. C\u00e1c h\u1ea1t l\u1edbn d\u1eabn \u0111\u1ebfn b\u1ec1 m\u1eb7t c\u00f3 k\u1ebft c\u1ea5u \u201cv\u1ecf cam\u201d th\u00f4 r\u00e1p sau c\u00e1c qu\u00e1 tr\u00ecnh gia c\u00f4ng sau n\u00e0y, c\u00f3 th\u1ec3 c\u1ea7n m\u00e0i ho\u1eb7c \u0111\u00e1nh b\u00f3ng t\u1ed1n k\u00e9m \u0111\u1ec3 s\u1eeda ch\u1eefa. Quan tr\u1ecdng h\u01a1n, c\u1ea5u tr\u00fac h\u1ea1t qu\u00e1 th\u00f4 l\u00e0m gi\u1ea3m kh\u1ea3 n\u0103ng ch\u1ed1ng g\u00e3y v\u00e0 ch\u1ecbu t\u00e1c \u0111\u1ed9ng c\u1ee7a v\u1eadt li\u1ec7u, khi\u1ebfn n\u00f3 d\u1ec5 b\u1ecb h\u1ecfng \u0111\u1ed9t ng\u1ed9t d\u01b0\u1edbi t\u1ea3i tr\u1ecdng.<\/li>\n<li>Gi\u1ea3i ph\u00e1p:<\/li>\n<li>C\u1ea3i thi\u1ec7n c\u00e1c y\u1ebfu t\u1ed1 quy tr\u00ecnh. Gi\u1ea3m th\u1eddi gian ng\u00e2m \u0111\u1ec3 \u0111\u1ea1t m\u1ee9c t\u1ed1i thi\u1ec3u c\u1ea7n thi\u1ebft cho s\u1ef1 bi\u1ebfn \u0111\u1ed5i ho\u00e0n to\u00e0n qua to\u00e0n b\u1ed9 m\u1eb7t c\u1eaft c\u1ee7a chi ti\u1ebft.<\/li>\n<li>Gi\u1ea3m nhi\u1ec7t \u0111\u1ed9 \u1ee7 xu\u1ed1ng m\u1ee9c th\u1ea5p h\u01a1n trong ph\u1ea1m vi khuy\u1ebfn ngh\u1ecb. Nhi\u1ec7t \u0111\u1ed9 th\u1ea5p h\u01a1n s\u1ebd l\u00e0m ch\u1eadm t\u1ed1c \u0111\u1ed9 ph\u00e1t tri\u1ec3n c\u1ee7a h\u1ea1t.<\/li>\n<li>\u0110\u1ed1i v\u1edbi m\u1ed9t s\u1ed1 lo\u1ea1i th\u00e9p, quy tr\u00ecnh hai b\u01b0\u1edbc g\u1ed3m x\u1eed l\u00fd b\u00ecnh th\u01b0\u1eddng (\u0111\u1ec3 tinh ch\u1ebf h\u1ea1t) sau \u0111\u00f3 \u1ee7 c\u00f3 th\u1ec3 t\u1ea1o ra c\u1ea5u tr\u00fac h\u1ea1t m\u1ecbn, m\u1ec1m m\u1ea1i.<\/li>\n<\/ul>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-uVmVzxYNQUg.jpg\" height=\"1067\" width=\"1600\" class=\"alignnone size-full wp-image-2498\" alt=\"Luy\u1ec7n kim th\u00e9p li\u00ean quan \u0111\u1ebfn vi\u1ec7c nung n\u00f3ng kim lo\u1ea1i \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 nh\u1ea5t \u0111\u1ecbnh \u0111\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 d\u1ebbo v\u00e0 gi\u1ea3m \u0111\u1ed9 c\u1ee9ng, \u0111i\u1ec1u c\u1ea7n thi\u1ebft trong vi\u1ec7c s\u1ea3n xu\u1ea5t v\u00edt v\u00e0 bu l\u00f4ng c\u00f4ng nghi\u1ec7p ch\u1ea5t l\u01b0\u1ee3ng cao.\" srcset=\"https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-uVmVzxYNQUg.jpg 1600w, https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-uVmVzxYNQUg-300x200.jpg 300w, https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-uVmVzxYNQUg-768x512.jpg 768w, https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-uVmVzxYNQUg-1536x1024.jpg 1536w, https:\/\/productionscrews.com\/wp-content\/uploads\/2025\/09\/unsplash-uVmVzxYNQUg-18x12.jpg 18w\" sizes=\"(max-width: 1600px) 100vw, 1600px\" \/> <\/p>\n<h3>L\u1ed7i b\u1ec1 m\u1eb7t<\/h3>\n<p>Nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 kh\u00ed quy\u1ec3n ph\u1ea3n \u1ee9ng b\u00ean trong l\u00f2 nung c\u00f3 th\u1ec3 g\u00e2y ra nh\u1eefng bi\u1ebfn \u0111\u1ed5i kh\u00f4ng mong mu\u1ed1n tr\u00ean b\u1ec1 m\u1eb7t th\u00e9p. Hai l\u1ed7i b\u1ec1 m\u1eb7t ph\u1ed5 bi\u1ebfn nh\u1ea5t l\u00e0 m\u1ea5t cacbon v\u00e0 oxy h\u00f3a.<\/p>\n<ul>\n<li>M\u1ea5t cacbon: \u0110\u00e2y l\u00e0 s\u1ef1 m\u1ea5t cacbon t\u1eeb l\u1edbp b\u1ec1 m\u1eb7t c\u1ee7a th\u00e9p. X\u1ea3y ra khi c\u00e1c nguy\u00ean t\u1eed cacbon tr\u00ean b\u1ec1 m\u1eb7t ph\u1ea3n \u1ee9ng v\u1edbi oxy ho\u1eb7c h\u01a1i n\u01b0\u1edbc trong kh\u00ed quy\u1ec3n c\u1ee7a l\u00f2 nung. \u0110i\u1ec1u n\u00e0y \u0111\u1ec3 l\u1ea1i m\u1ed9t l\u1edbp s\u1eaft m\u1ec1m, y\u1ebfu, \u00edt cacbon tr\u00ean b\u1ec1 m\u1eb7t, kh\u00f4ng ph\u1ea3n \u1ee9ng v\u1edbi c\u00e1c qu\u00e1 tr\u00ecnh t\u00f4i c\u1ee9ng sau n\u00e0y v\u00e0 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n k\u00e9m.<\/li>\n<li>Oxy h\u00f3a (M\u00e0ng oxit): \u0110\u00e2y l\u00e0 s\u1ef1 h\u00ecnh th\u00e0nh c\u1ee7a m\u1ed9t l\u1edbp d\u00e0y, d\u1ec5 v\u1ee1 c\u1ee7a oxit s\u1eaft tr\u00ean b\u1ec1 m\u1eb7t. M\u00e0ng oxit ph\u1ea3i \u0111\u01b0\u1ee3c lo\u1ea1i b\u1ecf b\u1eb1ng c\u00e1c quy tr\u00ecnh t\u1ed1n k\u00e9m nh\u01b0 phun c\u00e1t ho\u1eb7c ng\u00e2m axit tr\u01b0\u1edbc khi ti\u1ebfp t\u1ee5c gia c\u00f4ng. N\u00f3 c\u0169ng g\u00e2y m\u1ea5t v\u1eadt li\u1ec7u v\u00e0 c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn b\u1ec1 m\u1eb7t k\u00e9m ch\u1ea5t l\u01b0\u1ee3ng.<\/li>\n<li>Gi\u1ea3i ph\u00e1p:<\/li>\n<li>S\u1eed d\u1ee5ng kh\u00ed quy\u1ec3n l\u00f2 nung \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t. Th\u00eam kh\u00ed tr\u01a1 (nh\u01b0 nit\u01a1 ho\u1eb7c argon) ho\u1eb7c kh\u00ed gi\u1ea3m (nh\u01b0 h\u1ed7n h\u1ee3p nit\u01a1 v\u00e0 hydro) c\u00f3 th\u1ec3 thay th\u1ebf oxy v\u00e0 ng\u0103n ch\u1eb7n c\u00e1c ph\u1ea3n \u1ee9ng n\u00e0y.<\/li>\n<li>\u0110\u1ed1i v\u1edbi c\u00e1c thi\u1ebft l\u1eadp l\u00f2 nung \u0111\u01a1n gi\u1ea3n h\u01a1n, c\u00e1c chi ti\u1ebft c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u00f3ng g\u00f3i trong container ch\u1ee9a m\u1ea3nh gang c\u0169 ho\u1eb7c v\u1eadt li\u1ec7u ch\u1ee9a cacbon kh\u00e1c, s\u1ebd ti\u00eau th\u1ee5 oxy c\u00f3 s\u1eb5n.<\/li>\n<li>\u00c1p d\u1ee5ng l\u1edbp ph\u1ee7 ch\u1ed1ng oxit \u0111\u1eb7c bi\u1ec7t cho c\u00e1c chi ti\u1ebft tr\u01b0\u1edbc khi nung.<\/li>\n<li>Gi\u1ea3m thi\u1ec3u th\u1eddi gian ti\u1ebfp x\u00fac \u1edf nhi\u1ec7t \u0111\u1ed9 cao \u0111\u1ec3 gi\u1ea3m thi\u1ec3u c\u00e1c ph\u1ea3n \u1ee9ng b\u1ec1 m\u1eb7t n\u00e0y.<\/li>\n<\/ul>\n<h3>B\u1ea3ng 3: H\u01b0\u1edbng d\u1eabn x\u1eed l\u00fd s\u1ef1 c\u1ed1 khi \u1ee7 th\u00e9p<\/h3>\n<table>\n<tbody>\n<tr>\n<td width=\"192\">L\u1ed7i \/ V\u1ea5n \u0111\u1ec1<\/td>\n<td width=\"192\">Nguy\u00ean nh\u00e2n ti\u1ec1m n\u0103ng<\/td>\n<td width=\"192\">H\u00e0nh \u0111\u1ed9ng kh\u1eafc ph\u1ee5c<\/td>\n<\/tr>\n<tr>\n<td width=\"192\">M\u1ec1m h\u00f3a kh\u00f4ng ho\u00e0n ch\u1ec9nh<\/td>\n<td width=\"192\">1. Nhi\u1ec7t \u0111\u1ed9 qu&aacute; th\u1ea5p. &lt;br&gt; 2. Th\u1eddi gian ng&acirc;m qu&aacute; ng\u1eafn. &lt;br&gt; 3. \u0110o nhi\u1ec7t \u0111\u1ed9 kh&ocirc;ng ch&iacute;nh x&aacute;c.<\/td>\n<td width=\"192\">1. T\u0103ng \u0111i\u1ec3m \u0111\u1eb7t l&ograve; nung. &lt;br&gt; 2. T\u0103ng th\u1eddi gian ng&acirc;m d\u1ef1a tr&ecirc;n \u0111\u1ed9 d&agrave;y. &lt;br&gt; 3. Ki\u1ec3m tra \u0111\u1ed9 hi\u1ec7u ch\u1ec9nh v&agrave; v\u1ecb tr&iacute; c\u1ee7a thi\u1ebft b\u1ecb \u0111o nhi\u1ec7t \u0111\u1ed9.<\/td>\n<\/tr>\n<tr>\n<td width=\"192\">T\u0103ng tr\u01b0\u1edfng h\u1ea1t qu\u00e1 m\u1ee9c<\/td>\n<td width=\"192\">1. Nhi\u1ec7t \u0111\u1ed9 qu&aacute; cao. &lt;br&gt; 2. Th\u1eddi gian ng&acirc;m qu&aacute; l&acirc;u.<\/td>\n<td width=\"192\">1. Gi\u1ea3m nhi\u1ec7t \u0111\u1ed9 \u1ee7. &lt;br&gt; 2. Gi\u1ea3m th\u1eddi gian ng&acirc;m xu\u1ed1ng m\u1ee9c t\u1ed1i thi\u1ec3u c\u1ea7n thi\u1ebft.<\/td>\n<\/tr>\n<tr>\n<td width=\"192\">M\u1ea5t cacbon b\u1ec1 m\u1eb7t<\/td>\n<td width=\"192\">1. Kh&ocirc;ng ki\u1ec3m so&aacute;t \u0111\u01b0\u1ee3c kh&iacute; quy\u1ec3n trong l&ograve; nung (oxy d\u01b0 th\u1eeba). &lt;br&gt; 2. Th\u1eddi gian \u1edf nhi\u1ec7t \u0111\u1ed9 cao qu&aacute; l&acirc;u.<\/td>\n<td width=\"192\">1. S\u1eed d\u1ee5ng m&ocirc;i tr\u01b0\u1eddng ki\u1ec3m so&aacute;t (kh&iacute; tr\u01a1\/kh&iacute; gi\u1ea3m). &lt;br&gt; 2. Gi\u1ea3m thi\u1ec3u th\u1eddi gian tr&ecirc;n nhi\u1ec7t \u0111\u1ed9 t\u1edbi h\u1ea1n.<\/td>\n<\/tr>\n<tr>\n<td width=\"192\">Oxy h\u00f3a \/ M\u00e0ng oxit d\u00e0y<\/td>\n<td width=\"192\">1. M&ocirc;i tr\u01b0\u1eddng l&ograve; nung kh&ocirc;ng ki\u1ec3m so&aacute;t. &lt;br&gt; 2. C\u1eeda l&ograve; b\u1ecb r&ograve; r\u1ec9.<\/td>\n<td width=\"192\">1. S\u1eed d\u1ee5ng kh&iacute; ki\u1ec3m so&aacute;t ho\u1eb7c l\u1edbp ph\u1ee7 ch\u1ed1ng \u0111&oacute;ng c\u1eb7n. &lt;br&gt; 2. Ki\u1ec3m tra v&agrave; s\u1eeda ch\u1eefa c&aacute;c k&iacute;n c\u1ee7a l&ograve; nung.<\/td>\n<\/tr>\n<tr>\n<td width=\"192\">Bi\u1ebfn d\u1ea1ng \/ Cong v\u00eanh<\/td>\n<td width=\"192\">1. Improper support in the furnace. &lt;br&gt; 2. Cooling or heating too rapidly. &lt;br&gt; 3. High leftover stresses from earlier operations.<\/td>\n<td width=\"192\">1. S\u1eed d\u1ee5ng d\u1ee5ng c\u1ee5 ph&ugrave; h\u1ee3p \u0111\u1ec3 h\u1ed7 tr\u1ee3 chi ti\u1ebft. &lt;br&gt; 2. Gi\u1ea3m t\u1ed1c \u0111\u1ed9 l&agrave;m n&oacute;ng\/l&agrave;m m&aacute;t. &lt;br&gt; 3. Th&ecirc;m chu tr&igrave;nh gi\u1ea3m \u1ee9ng su\u1ea5t ri&ecirc;ng bi\u1ec7t.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>L\u00e0m ch\u1ee7 \u0111\u1eb7c t\u00ednh c\u1ee7a th\u00e9p<\/h2>\n<p>\u1ee6 th\u00e9p l\u00e0 h\u01a1n c\u1ea3 vi\u1ec7c \u201cl\u00e0m n\u00f3ng v\u00e0 l\u00e0m ngu\u1ed9i\u201d. \u0110\u00f3 l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh luy\u1ec7n kim ch\u00ednh x\u00e1c cho ph\u00e9p ch\u00fang ta \u0111i\u1ec1u ch\u1ec9nh c\u00e1c \u0111\u1eb7c t\u00ednh c\u1ee7a v\u1eadt li\u1ec7u \u0111\u1ec3 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u c\u1ee7a m\u1ed9t m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng c\u1ee5 th\u1ec3. T\u1eeb vi\u1ec7c \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 u\u1ed1n cong c\u1ef1c cao c\u1ea7n thi\u1ebft \u0111\u1ec3 d\u1eadp s\u00e2u m\u1ed9t t\u1ea5m th\u00e2n xe \u0111\u1ebfn t\u1ed1i \u01b0u h\u00f3a kh\u1ea3 n\u0103ng gia c\u00f4ng c\u1ee7a m\u1ed9t th\u00e0nh ph\u1ea7n th\u00e9p d\u1ee5ng c\u1ee5 ph\u1ee9c t\u1ea1p, \u1ee7 c\u00f3 ki\u1ec3m so\u00e1t l\u00e0 ch\u00eca kh\u00f3a. Hi\u1ec3u r\u00f5 c\u00e1c nguy\u00ean l\u00fd \u0111\u00e3 th\u1ea3o lu\u1eadn l\u00e0 \u0111i\u1ec1u ph\u00e2n bi\u1ec7t gi\u1eefa x\u1eed l\u00fd nhi\u1ec7t \u0111\u01a1n gi\u1ea3n v\u00e0 k\u1ef9 thu\u1eadt v\u1eadt li\u1ec7u th\u1ef1c s\u1ef1.<\/p>\n<p>Ch\u00fang t\u00f4i \u0111\u00e3 kh\u00e1m ph\u00e1 c\u00e1c khoa h\u1ecdc c\u01a1 b\u1ea3n, quy tr\u00ecnh nh\u00e0 m\u00e1y, c\u00e1c ki\u1ec3m so\u00e1t quan tr\u1ecdng v\u00e0 c\u00e1c gi\u1ea3i ph\u00e1p th\u1ef1c t\u1ebf cho c\u00e1c v\u1ea5n \u0111\u1ec1 ph\u1ed5 bi\u1ebfn. C\u00e1c tr\u1ee5 c\u1ed9t ch\u00ednh \u0111\u1ec3 th\u00e0nh c\u00f4ng v\u1eabn kh\u00f4ng \u0111\u1ed5i:<\/p>\n<ul>\n<li>C\u00e1c giai \u0111o\u1ea1n khoa h\u1ecdc c\u1ee7a Ph\u1ee5c h\u1ed3i, T\u00e1i k\u1ebft tinh v\u00e0 Qu\u00e1 tr\u00ecnh Ph\u00e1t tri\u1ec3n H\u1ea1t ki\u1ec3m so\u00e1t s\u1ef1 ti\u1ebfn h\u00f3a c\u1ea5u tr\u00fac nh\u1ecf b\u00e9.<\/li>\n<li>L\u1ef1a ch\u1ecdn m\u1ed9t quy tr\u00ecnh c\u1ee5 th\u1ec3\u2014Ho\u00e0n ch\u1ec9nh, Quy tr\u00ecnh, Spheroidizing ho\u1eb7c Gi\u1ea3m \u1ee9ng\u2014ph\u1ea3i ph\u00f9 h\u1ee3p v\u1edbi v\u1eadt li\u1ec7u v\u00e0 m\u1ee5c ti\u00eau s\u1ea3n xu\u1ea5t.<\/li>\n<li>Ki\u1ec3m so\u00e1t tuy\u1ec7t \u0111\u1ed1i ba y\u1ebfu t\u1ed1 quan tr\u1ecdng\u2014Nhi\u1ec7t \u0111\u1ed9, Th\u1eddi gian v\u00e0 T\u1ed1c \u0111\u1ed9 L\u00e0m m\u00e1t\u2014l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 nh\u1ea5t qu\u00e1n.<\/li>\n<\/ul>\n<p>B\u1eb1ng c\u00e1ch l\u00e0m ch\u1ee7 c\u00e1c kh\u00e1i ni\u1ec7m n\u00e0y, c\u00e1c k\u1ef9 s\u01b0, nh\u00e0 luy\u1ec7n kim v\u00e0 nh\u00e0 s\u1ea3n xu\u1ea5t c\u00f3 th\u1ec3 khai th\u00e1c to\u00e0n b\u1ed9 ti\u1ec1m n\u0103ng c\u1ee7a th\u00e9p. Hi\u1ec3u bi\u1ebft s\u00e2u s\u1eafc v\u00e0 ki\u1ec3m so\u00e1t ch\u00ednh x\u00e1c qu\u00e1 tr\u00ecnh \u1ee7 nhi\u1ec7t gi\u00fap ch\u00fang ta bi\u1ebfn m\u1ed9t h\u1ee3p kim ti\u00eau chu\u1ea9n th\u00e0nh v\u1eadt li\u1ec7u hi\u1ec7u su\u1ea5t cao, \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t t\u1ed1i \u01b0u, \u0111\u1ed9 tin c\u1eady v\u00e0 kh\u1ea3 n\u0103ng s\u1ea3n xu\u1ea5t trong v\u00f4 s\u1ed1 \u1ee9ng d\u1ee5ng t\u1ea1o n\u00ean n\u1ec1n t\u1ea3ng c\u1ee7a th\u1ebf gi\u1edbi hi\u1ec7n \u0111\u1ea1i c\u1ee7a ch\u00fang ta.<\/p>\n<ul>\n<li class=\"whitespace-normal break-words\"><strong>Electroplating \u2013 Wikipedia<\/strong> <a class=\"underline\" href=\"https:\/\/en.wikipedia.org\/wiki\/Electroplating\" target=\"_blank\" rel=\"noopener\">https:\/\/en.wikipedia.org\/wiki\/Electroplating<\/a><\/li>\n<li class=\"whitespace-normal break-words\"><strong>Anodizing \u2013 Wikipedia<\/strong> <a class=\"underline\" href=\"https:\/\/en.wikipedia.org\/wiki\/Anodizing\" target=\"_blank\" rel=\"noopener\">https:\/\/en.wikipedia.org\/wiki\/Anodizing<\/a><\/li>\n<li class=\"whitespace-normal break-words\"><strong>Chuy\u00ean \u0111\u1ec1 ScienceDirect \u2013 X\u1eed l\u00fd b\u1ec1 m\u1eb7t \u0111i\u1ec7n h\u00f3a<\/strong> <a class=\"underline\" href=\"https:\/\/www.sciencedirect.com\/topics\/materials-science\/electrochemical-surface-treatment\" target=\"_blank\" rel=\"noopener\">https:\/\/www.sciencedirect.com\/topics\/materials-science\/electrochemical-surface-treatment<\/a><\/li>\n<li class=\"whitespace-normal break-words\"><strong>Ti\u00eau chu\u1ea9n c\u1ee7a ASTM International \u2013 Ti\u00eau chu\u1ea9n x\u1eed l\u00fd b\u1ec1 m\u1eb7t<\/strong> <a class=\"underline\" href=\"https:\/\/www.astm.org\/\" target=\"_blank\" rel=\"noopener\">https:\/\/www.astm.org\/<\/a><\/li>\n<li class=\"whitespace-normal break-words\"><strong>Hi\u1ec7p h\u1ed9i B\u1ea3o v\u1ec7 v\u00e0 Hi\u1ec7u su\u1ea5t V\u1eadt li\u1ec7u (AMPP)<\/strong> <a class=\"underline\" href=\"https:\/\/ampp.org\/\" target=\"_blank\" rel=\"noopener\">https:\/\/ampp.org\/<\/a><\/li>\n<li class=\"whitespace-normal break-words\"><strong>ASM International \u2013 K\u1ef9 thu\u1eadt b\u1ec1 m\u1eb7t<\/strong> <a class=\"underline\" href=\"https:\/\/www.asminternational.org\/\" target=\"_blank\" rel=\"noopener\">https:\/\/www.asminternational.org\/<\/a><\/li>\n<li class=\"whitespace-normal break-words\"><strong>NIST \u2013 Khoa h\u1ecdc \u0111o l\u01b0\u1eddng v\u1eadt li\u1ec7u<\/strong> <a class=\"underline\" href=\"https:\/\/www.nist.gov\/mml\" target=\"_blank\" rel=\"noopener\">https:\/\/www.nist.gov\/mml<\/a><\/li>\n<li class=\"whitespace-normal break-words\"><strong>SpringerLink \u2013 C\u00f4ng ngh\u1ec7 b\u1ec1 m\u1eb7t v\u00e0 l\u1edbp ph\u1ee7<\/strong> <a class=\"underline\" href=\"https:\/\/link.springer.com\/journal\/11998\" target=\"_blank\" rel=\"noopener\">https:\/\/link.springer.com\/journal\/11998<\/a><\/li>\n<li class=\"whitespace-normal break-words\"><strong>Materials Today \u2013 K\u1ef9 thu\u1eadt b\u1ec1 m\u1eb7t<\/strong> <a class=\"underline\" href=\"https:\/\/www.materialstoday.com\/\" target=\"_blank\" rel=\"noopener\">https:\/\/www.materialstoday.com\/<\/a><\/li>\n<li class=\"whitespace-normal break-words\"><strong>SAE International \u2013 Ti\u00eau chu\u1ea9n x\u1eed l\u00fd b\u1ec1 m\u1eb7t<\/strong> <a class=\"underline\" href=\"https:\/\/www.sae.org\/\" target=\"_blank\" rel=\"noopener\">https:\/\/www.sae.org\/<\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>A Guide to Steel Annealing Steel annealing is a heating process that changes the tiny structure inside steel to improve how it works. The main goals of this process are important for working with metal: to make steel easier to bend, soften it for shaping, reduce stress inside the metal, and make it easier to [&hellip;]<\/p>","protected":false},"author":1,"featured_media":2501,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[],"class_list":["post-2497","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-5g-communication-fasteners"],"_links":{"self":[{"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/posts\/2497","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/comments?post=2497"}],"version-history":[{"count":3,"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/posts\/2497\/revisions"}],"predecessor-version":[{"id":2857,"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/posts\/2497\/revisions\/2857"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/media\/2501"}],"wp:attachment":[{"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/media?parent=2497"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/categories?post=2497"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/productionscrews.com\/vi\/wp-json\/wp\/v2\/tags?post=2497"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}