{"id":10686,"date":"2024-09-20T05:51:00","date_gmt":"2024-09-19T21:51:00","guid":{"rendered":"https:\/\/app11147.cloudwayssites.com\/?p=10686"},"modified":"2024-11-15T17:13:39","modified_gmt":"2024-11-15T09:13:39","slug":"hardness","status":"publish","type":"post","link":"https:\/\/steelprogroup.com\/vi\/stainless-steel\/properties\/hardness\/","title":{"rendered":"Gi\u1ea3i th\u00edch \u0111\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 v\u00e0 bi\u1ec3u \u0111\u1ed3 \u0111\u1ed9 c\u1ee9ng"},"content":{"rendered":"<p class=\"wp-block-paragraph\">L\u00e0 m\u1ed9t ch\u1ec9 s\u1ed1 quan tr\u1ecdng v\u1ec1 kh\u1ea3 n\u0103ng v\u1eadt li\u1ec7u, \u0111\u1ed9 c\u1ee9ng r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi vi\u1ec7c \u0111\u00e1nh gi\u00e1 hi\u1ec7u su\u1ea5t v\u00e0 l\u1ef1a ch\u1ecdn \u1ee9ng d\u1ee5ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9. Ch\u00fang t\u00f4i gi\u1ea3i th\u00edch chi ti\u1ebft kh\u00e1i ni\u1ec7m, ph\u01b0\u01a1ng ph\u00e1p \u0111o l\u01b0\u1eddng, c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng, \u00fd ngh\u0129a v\u00e0 ph\u01b0\u01a1ng ph\u00e1p c\u1ea3i thi\u1ec7n \u0111\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 v\u00e0 so s\u00e1nh v\u1edbi th\u00e9p cacbon \u0111\u1ec3 b\u1ea1n c\u00f3 th\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 th\u00e9p kh\u00f4ng g\u1ec9. Cu\u1ed1i c\u00f9ng, b\u1ea3ng \u0111\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 \u0111\u01b0\u1ee3c \u0111\u00ednh k\u00e8m \u0111\u1ec3 tham kh\u1ea3o.<\/p><h2 class=\"wp-block-heading\">\u0110\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 l\u00e0 bao nhi\u00eau?<\/h2><p class=\"wp-block-paragraph\">\u0110\u1ed9 c\u1ee9ng l\u00e0 kh\u1ea3 n\u0103ng c\u1ee7a v\u1eadt li\u1ec7u ch\u1ed1ng l\u1ea1i bi\u1ebfn d\u1ea1ng \u00e1p su\u1ea5t c\u1ee5c b\u1ed9 ho\u1eb7c tr\u1ea7y x\u01b0\u1edbc. \u0110\u1ed9 c\u1ee9ng kh\u00f4ng ph\u1ea3i l\u00e0 \u0111\u1eb7c t\u00ednh v\u1ed1n c\u00f3 c\u1ee7a v\u1eadt li\u1ec7u v\u00e0 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi ph\u01b0\u01a1ng ph\u00e1p v\u00e0 \u0111i\u1ec1u ki\u1ec7n th\u1eed nghi\u1ec7m. \u0110o \u0111\u1ed9 c\u1ee9ng l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n, hi\u1ec7u su\u1ea5t x\u1eed l\u00fd v\u00e0 tu\u1ed5i th\u1ecd c\u1ee7a v\u1eadt li\u1ec7u. \u0110\u1ed1i v\u1edbi th\u00e9p kh\u00f4ng g\u1ec9, \u0111\u1ed9 c\u1ee9ng li\u00ean quan tr\u1ef1c ti\u1ebfp \u0111\u1ebfn ph\u1ea1m vi \u1ee9ng d\u1ee5ng v\u00e0 \u0111\u1ed9 b\u1ec1n c\u1ee7a n\u00f3.<\/p><h2 class=\"wp-block-heading\">\u0110\u1ed9 c\u1ee9ng ti\u00eau chu\u1ea9n c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 l\u00e0 bao nhi\u00eau?<\/h2><p class=\"wp-block-paragraph\">\u0110\u1ed9 c\u1ee9ng ti\u00eau chu\u1ea9n c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 thay \u0111\u1ed5i theo t\u1eebng lo\u1ea1i:<\/p><ul class=\"wp-block-list\"><li>Th\u00e9p kh\u00f4ng g\u1ec9 austenit (nh\u01b0 304 v\u00e0 316) th\u01b0\u1eddng c\u00f3 HRB t\u1eeb 70 \u0111\u1ebfn 90 (Rockwell B).<\/li>\n\n<li>Th\u00e9p kh\u00f4ng g\u1ec9 martensitic (nh\u01b0 410 v\u00e0 420) c\u00f3 th\u1ec3 \u0111\u1ea1t t\u1edbi 40 \u0111\u1ebfn 60 HRC (Rockwell C) sau khi x\u1eed l\u00fd nhi\u1ec7t v\u00e0 c\u00f3 th\u1ec3 c\u1ee9ng h\u01a1n.<\/li>\n\n<li>Th\u00e9p kh\u00f4ng g\u1ec9 Ferritic (nh\u01b0 430) th\u01b0\u1eddng c\u00f3 HRB t\u1eeb 60 \u0111\u1ebfn 90.<\/li><\/ul><p class=\"wp-block-paragraph\">Nh\u1eefng gi\u00e1 tr\u1ecb n\u00e0y c\u00f3 th\u1ec3 thay \u0111\u1ed5i t\u00f9y thu\u1ed9c v\u00e0o th\u00e0nh ph\u1ea7n h\u1ee3p kim c\u1ee5 th\u1ec3 v\u00e0 ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd.<\/p><h2 class=\"wp-block-heading\">Ph\u01b0\u01a1ng ph\u00e1p ki\u1ec3m tra \u0111\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9<\/h2><h3 class=\"wp-block-heading\">\u0110\u1ed9 c\u1ee9ng Brinell<\/h3><p class=\"wp-block-paragraph\">Ki\u1ec3m tra \u0111\u1ed9 c\u1ee9ng Brinell l\u00e0 ph\u01b0\u01a1ng ph\u00e1p \u0111\u00e1nh gi\u00e1 \u0111\u1ed9 c\u1ee9ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng, ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c v\u1eadt li\u1ec7u m\u1ec1m h\u01a1n. Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y t\u00ednh \u0111\u1ed9 c\u1ee9ng theo k\u00edch th\u01b0\u1edbc v\u1ebft l\u00f5m do vi\u00ean bi th\u00e9p \u0111\u1ec3 l\u1ea1i khi \u1ea5n v\u00e0o v\u1eadt li\u1ec7u. \u0110\u1ed9 c\u1ee9ng \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n b\u1eb1ng HB, gi\u00e1 tr\u1ecb c\u00e0ng l\u1edbn th\u00ec v\u1eadt li\u1ec7u c\u00e0ng c\u1ee9ng. Tuy nhi\u00ean, do v\u1ebft l\u00f5m l\u1edbn n\u00ean ph\u01b0\u01a1ng ph\u00e1p n\u00e0y kh\u00f4ng ph\u00f9 h\u1ee3p \u0111\u1ec3 \u0111o c\u00e1c t\u1ea5m m\u1ecfng ho\u1eb7c c\u00e1c b\u1ed9 ph\u1eadn nh\u1ecf.<\/p><h3 class=\"wp-block-heading\">\u0110\u1ed9 c\u1ee9ng Rockwell<\/h3><p class=\"wp-block-paragraph\">Ki\u1ec3m tra \u0111\u1ed9 c\u1ee9ng Rockwell \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i cho nhi\u1ec1u lo\u1ea1i v\u1eadt li\u1ec7u. \u0110\u1ea7u kim c\u01b0\u01a1ng h\u00ecnh n\u00f3n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u1ea5n nh\u1eb9 b\u1ec1 m\u1eb7t v\u1eadt li\u1ec7u v\u00e0 \u0111o \u0111\u1ed9 s\u00e2u c\u1ee7a v\u1ebft l\u00f5m \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c \u0111\u1ed9 c\u1ee9ng. C\u00f3 c\u00e1c thang \u0111o HRA, HRB, HRC v\u00e0 c\u00e1c thang \u0111o kh\u00e1c. Thang \u0111o HRC th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho th\u00e9p kh\u00f4ng g\u1ec9. Gi\u00e1 tr\u1ecb HRC c\u00e0ng l\u1edbn th\u00ec v\u1eadt li\u1ec7u c\u00e0ng c\u1ee9ng.<\/p><h3 class=\"wp-block-heading\">\u0110\u1ed9 c\u1ee9ng Vickers<\/h3><p class=\"wp-block-paragraph\">\u0110\u1ed9 c\u1ee9ng Vickers (HV) l\u00e0 m\u1ed9t k\u1ef9 thu\u1eadt ph\u1ed5 bi\u1ebfn \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 \u0111\u1ed9 c\u1ee9ng c\u1ee7a kim lo\u1ea1i (nh\u01b0 th\u00e9p kh\u00f4ng g\u1ec9) v\u00e0 v\u1eadt li\u1ec7u phi kim lo\u1ea1i. M\u1ed9t \u0111\u1ea7u \u0111o h\u00ecnh n\u00f3n vu\u00f4ng kim c\u01b0\u01a1ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u00e1c d\u1ee5ng l\u1ef1c l\u00ean v\u1eadt li\u1ec7u v\u00e0 \u0111\u1ed9 c\u1ee9ng \u0111\u01b0\u1ee3c \u0111\u1ecbnh l\u01b0\u1ee3ng b\u1eb1ng c\u00e1ch \u0111o chi\u1ec1u d\u00e0i \u0111\u01b0\u1eddng ch\u00e9o c\u1ee7a v\u1ebft l\u00f5m nh\u1ecf. V\u1ebft l\u00f5m c\u00e0ng nh\u1ecf th\u00ec v\u1eadt li\u1ec7u c\u00e0ng c\u1ee9ng. K\u1ef9 thu\u1eadt n\u00e0y \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u1edbi \u0111\u1ed9 ch\u00ednh x\u00e1c cao, v\u1ebft l\u00f5m nh\u1ecf v\u00e0 kh\u1ea3 n\u0103ng l\u1eb7p l\u1ea1i t\u1ed1t, nh\u01b0ng c\u1ea7n ph\u1ea3i \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1eabu ph\u1eb3ng v\u00e0 c\u00e1c \u0111i\u1ec1u ki\u1ec7n th\u1eed nghi\u1ec7m \u1ed5n \u0111\u1ecbnh \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o k\u1ebft qu\u1ea3 ch\u00ednh x\u00e1c.<\/p><h3 class=\"wp-block-heading\">\u0110\u1ed9 c\u1ee9ng Mohs<\/h3><p class=\"wp-block-paragraph\">\u0110\u1ed9 c\u1ee9ng Mohs l\u00e0 ph\u01b0\u01a1ng ph\u00e1p ki\u1ec3m tra \u0111\u1ed9 c\u1ee9ng t\u01b0\u01a1ng \u0111\u1ed1i so s\u00e1nh kh\u1ea3 n\u0103ng ch\u1ed1ng tr\u1ea7y x\u01b0\u1edbc c\u1ee7a v\u1eadt li\u1ec7u. N\u00f3 \u0111\u01b0\u1ee3c chia th\u00e0nh m\u01b0\u1eddi c\u1ea5p \u0111\u1ed9, v\u1edbi c\u1ea5p \u0111\u1ed9 1 l\u00e0 m\u1ec1m nh\u1ea5t, ch\u1eb3ng h\u1ea1n nh\u01b0 talc, v\u00e0 c\u1ea5p \u0111\u1ed9 10 l\u00e0 c\u1ee9ng nh\u1ea5t, ch\u1eb3ng h\u1ea1n nh\u01b0 kim c\u01b0\u01a1ng. B\u00e0i ki\u1ec3m tra n\u00e0y \u0111\u01a1n gi\u1ea3n nh\u01b0ng mang t\u00ednh ch\u1ee7 quan cao v\u00e0 kh\u00f4ng ph\u00f9 h\u1ee3p \u0111\u1ec3 \u0111o ch\u00ednh x\u00e1c \u0111\u1ed9 c\u1ee9ng c\u1ee7a kim lo\u1ea1i nh\u01b0 th\u00e9p kh\u00f4ng g\u1ec9.<\/p><h2 class=\"wp-block-heading\">Nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0o \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9?<\/h2><p class=\"wp-block-paragraph\">\u0110\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi nhi\u1ec1u y\u1ebfu t\u1ed1, ch\u1ee7 y\u1ebfu bao g\u1ed3m th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc, quy tr\u00ecnh x\u1eed l\u00fd nhi\u1ec7t, m\u1ee9c \u0111\u1ed9 l\u00e0m vi\u1ec7c ngu\u1ed9i v\u00e0 c\u1ea5u tr\u00fac vi m\u00f4.<\/p><h3 class=\"wp-block-heading\">Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc<\/h3><p class=\"wp-block-paragraph\">Trong th\u00e9p kh\u00f4ng g\u1ec9, h\u00e0m l\u01b0\u1ee3ng crom, niken v\u00e0 molypden \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 c\u1ee9ng v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n c\u1ee7a n\u00f3. Nhi\u1ec1u carbon h\u01a1n l\u00e0m t\u0103ng \u0111\u1ed9 c\u1ee9ng, nh\u01b0ng l\u00e0m gi\u1ea3m kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n.<\/p><h3 class=\"wp-block-heading\">Qu\u00e1 tr\u00ecnh x\u1eed l\u00fd nhi\u1ec7t<\/h3><p class=\"wp-block-paragraph\">C\u1ea5u tr\u00fac vi m\u00f4 c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 c\u00f3 th\u1ec3 thay \u0111\u1ed5i th\u00f4ng qua c\u00e1c ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd nhi\u1ec7t nh\u01b0 l\u00e0m ngu\u1ed9i v\u00e0 ram, do \u0111\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 c\u1ee9ng c\u1ee7a n\u00f3. L\u00e0m ngu\u1ed9i c\u00f3 th\u1ec3 l\u00e0m t\u0103ng \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9, nh\u01b0ng d\u1ec5 l\u00e0m t\u0103ng \u0111\u1ed9 gi\u00f2n; ram c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 d\u1ebbo dai c\u1ee7a v\u1eadt li\u1ec7u trong khi v\u1eabn duy tr\u00ec \u0111\u1ed9 c\u1ee9ng nh\u1ea5t \u0111\u1ecbnh.<\/p><h3 class=\"wp-block-heading\">B\u1eb1ng c\u1ea5p l\u00e0m vi\u1ec7c l\u1ea1nh<\/h3><p class=\"wp-block-paragraph\">Gia c\u00f4ng ngu\u1ed9i nh\u01b0 c\u00e1n ngu\u1ed9i v\u00e0 k\u00e9o ngu\u1ed9i s\u1ebd khi\u1ebfn th\u00e9p kh\u00f4ng g\u1ec9 t\u1ea1o ra s\u1ef1 c\u1ee9ng khi gia c\u00f4ng, t\u1ee9c l\u00e0 khi l\u01b0\u1ee3ng bi\u1ebfn d\u1ea1ng t\u0103ng l\u00ean, \u0111\u1ed9 c\u1ee9ng c\u0169ng t\u0103ng d\u1ea7n. Tuy nhi\u00ean, gia c\u00f4ng ngu\u1ed9i qu\u00e1 m\u1ee9c c\u00f3 th\u1ec3 khi\u1ebfn v\u1eadt li\u1ec7u tr\u1edf n\u00ean gi\u00f2n v\u00e0 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c \u0111\u1eb7c t\u00ednh c\u1ee7a n\u00f3.<\/p><h3 class=\"wp-block-heading\">C\u1ea5u tr\u00fac vi m\u00f4<\/h3><p class=\"wp-block-paragraph\">C\u1ea5u tr\u00fac vi m\u00f4 c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9, ch\u1eb3ng h\u1ea1n nh\u01b0 k\u00edch th\u01b0\u1edbc h\u1ea1t v\u00e0 th\u00e0nh ph\u1ea7n pha, c\u00f3 t\u00e1c \u0111\u1ed9ng \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn \u0111\u1ed9 c\u1ee9ng c\u1ee7a n\u00f3. Tinh ch\u1ebf h\u1ea1t v\u00e0 t\u1ed1i \u01b0u h\u00f3a th\u00e0nh ph\u1ea7n pha l\u00e0 nh\u1eefng c\u00e1ch hi\u1ec7u qu\u1ea3 \u0111\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9.<\/p><h2 class=\"wp-block-heading\">T\u1ea7m quan tr\u1ecdng c\u1ee7a \u0111\u1ed9 c\u1ee9ng th\u00e9p kh\u00f4ng g\u1ec9<\/h2><p class=\"wp-block-paragraph\">\u0110\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 c\u00f3 \u1ea3nh h\u01b0\u1edfng quan tr\u1ecdng \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a n\u00f3 trong <strong>\u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf<\/strong>. V\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 c\u1ee9ng cao th\u01b0\u1eddng c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n v\u00e0 ch\u1ed1ng tr\u1ea7y x\u01b0\u1edbc t\u1ed1t h\u01a1n, ph\u00f9 h\u1ee3p v\u1edbi nh\u1eefng tr\u01b0\u1eddng h\u1ee3p y\u00eau c\u1ea7u kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n cao nh\u01b0 d\u1ee5ng c\u1ee5, \u1ed5 tr\u1ee5c, khu\u00f4n m\u1eabu, v.v. Th\u00e9p kh\u00f4ng g\u1ec9 c\u00f3 \u0111\u1ed9 c\u1ee9ng th\u1ea5p h\u01a1n c\u00f3 \u0111\u1ed9 d\u1ebbo v\u00e0 kh\u1ea3 n\u0103ng gia c\u00f4ng t\u1ed1t h\u01a1n, ph\u00f9 h\u1ee3p v\u1edbi nh\u1eefng tr\u01b0\u1eddng h\u1ee3p y\u00eau c\u1ea7u gia c\u00f4ng t\u1ea1o h\u00ecnh nh\u01b0 \u1ed1ng, th\u00f9ng ch\u1ee9a, v.v.<\/p><p class=\"wp-block-paragraph\">\u0110\u1ed9 c\u1ee9ng c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn <strong><a href=\"https:\/\/steelprogroup.com\/vi\/stainless-steel\/production\/cut\/\">c\u1eaft<\/a> hi\u1ec7u su\u1ea5t<\/strong> c\u1ee7a v\u1eadt li\u1ec7u. V\u1eadt li\u1ec7u c\u00f3 \u0111\u1ed9 c\u1ee9ng cao d\u1ec5 b\u1ecb m\u00e0i m\u00f2n d\u1ee5ng c\u1ee5 trong qu\u00e1 tr\u00ecnh c\u1eaft, nh\u01b0ng ch\u1ea5t l\u01b0\u1ee3ng b\u1ec1 m\u1eb7t gia c\u00f4ng t\u1ed1t h\u01a1n. \u0110\u1ed1i v\u1edbi c\u00e1c b\u1ed9 ph\u1eadn \u0111\u00f2i h\u1ecfi \u0111\u1ed9 ch\u00ednh x\u00e1c gia c\u00f4ng cao h\u01a1n, c\u1ea7n c\u00f3 \u0111\u1ed9 c\u1ee9ng ph\u00f9 h\u1ee3p.<\/p><h2 class=\"wp-block-heading\">L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9?<\/h2><p class=\"wp-block-paragraph\">C\u00f3 nhi\u1ec1u c\u00e1ch \u0111\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9, ch\u1ee7 y\u1ebfu bao g\u1ed3m \u0111i\u1ec1u ch\u1ec9nh th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc, t\u1ed1i \u01b0u h\u00f3a qu\u00e1 tr\u00ecnh x\u1eed l\u00fd nhi\u1ec7t, t\u0103ng m\u1ee9c \u0111\u1ed9 x\u1eed l\u00fd ngu\u1ed9i v\u00e0 s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 x\u1eed l\u00fd b\u1ec1 m\u1eb7t.<\/p><h3 class=\"wp-block-heading\">\u0110i\u1ec1u ch\u1ec9nh th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc<\/h3><p class=\"wp-block-paragraph\">\u0110\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n b\u1eb1ng c\u00e1ch t\u0103ng h\u00e0m l\u01b0\u1ee3ng cacbon, th\u00eam c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim (nh\u01b0 molypden, vanadi, v.v.) ho\u1eb7c s\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 h\u1ee3p kim \u0111\u1eb7c bi\u1ec7t. Tuy nhi\u00ean, c\u1ea7n l\u01b0u \u00fd r\u1eb1ng vi\u1ec7c t\u0103ng h\u00e0m l\u01b0\u1ee3ng cacbon c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n c\u1ee7a v\u1eadt li\u1ec7u.<\/p><h3 class=\"wp-block-heading\">T\u1ed1i \u01b0u h\u00f3a qu\u00e1 tr\u00ecnh x\u1eed l\u00fd nhi\u1ec7t<\/h3><p class=\"wp-block-paragraph\">B\u1eb1ng c\u00e1ch ki\u1ec3m so\u00e1t ch\u00ednh x\u00e1c c\u00e1c th\u00f4ng s\u1ed1 nh\u01b0 nhi\u1ec7t \u0111\u1ed9 t\u00f4i, th\u1eddi gian gi\u1eef v\u00e0 t\u1ed1c \u0111\u1ed9 l\u00e0m ngu\u1ed9i, c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c c\u1ea5u tr\u00fac vi m\u00f4 v\u00e0 \u0111\u1ed9 c\u1ee9ng l\u00fd t\u01b0\u1edfng. \u0110\u1ed3ng th\u1eddi, x\u1eed l\u00fd t\u00f4i h\u1ee3p l\u00fd c\u00f3 th\u1ec3 duy tr\u00ec \u0111\u1ed9 c\u1ee9ng nh\u1ea5t \u0111\u1ecbnh trong khi t\u0103ng \u0111\u1ed9 d\u1ebbo dai c\u1ee7a v\u1eadt li\u1ec7u.<\/p><h3 class=\"wp-block-heading\">T\u0103ng c\u01b0\u1eddng m\u1ee9c \u0111\u1ed9 ch\u1ebf bi\u1ebfn l\u1ea1nh<\/h3><p class=\"wp-block-paragraph\">Th\u00f4ng qua c\u00e1c ph\u01b0\u01a1ng ph\u00e1p gia c\u00f4ng ngu\u1ed9i nh\u01b0 c\u00e1n ngu\u1ed9i, k\u00e9o ngu\u1ed9i, th\u00e9p kh\u00f4ng g\u1ec9 \u0111\u01b0\u1ee3c t\u00f4i luy\u1ec7n, do \u0111\u00f3 t\u0103ng \u0111\u1ed9 c\u1ee9ng. Tuy nhi\u00ean, c\u1ea7n ki\u1ec3m so\u00e1t kh\u1ed1i l\u01b0\u1ee3ng gia c\u00f4ng \u0111\u1ec3 tr\u00e1nh gia c\u00f4ng qu\u00e1 m\u1ee9c khi\u1ebfn v\u1eadt li\u1ec7u tr\u1edf n\u00ean gi\u00f2n.<\/p><h3 class=\"wp-block-heading\">S\u1eed d\u1ee5ng c\u00f4ng ngh\u1ec7 x\u1eed l\u00fd b\u1ec1 m\u1eb7t<\/h3><p class=\"wp-block-paragraph\">Ch\u1eb3ng h\u1ea1n nh\u01b0 th\u1ea5m cacbon, th\u1ea5m nit\u01a1, x\u1eed l\u00fd l\u00e0m c\u1ee9ng b\u1ec1 m\u1eb7t, v.v., c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 \u0111\u1ed9 c\u1ee9ng v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n c\u1ee7a b\u1ec1 m\u1eb7t v\u1eadt li\u1ec7u m\u00e0 kh\u00f4ng l\u00e0m thay \u0111\u1ed5i hi\u1ec7u su\u1ea5t c\u1ee7a n\u1ec1n th\u00e9p kh\u00f4ng g\u1ec9.<\/p><h2 class=\"wp-block-heading\">Th\u00e9p kh\u00f4ng g\u1ec9 c\u00f3 ph\u1ea3i l\u00e0 th\u00e9p c\u1ee9ng kh\u00f4ng?<\/h2><p class=\"wp-block-paragraph\">Th\u00e9p kh\u00f4ng g\u1ec9 kh\u00f4ng ph\u1ea3i l\u00fac n\u00e0o c\u0169ng l\u00e0 th\u00e9p c\u1ee9ng. M\u1eb7c d\u00f9 m\u1ed9t s\u1ed1 lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9, ch\u1eb3ng h\u1ea1n nh\u01b0 th\u00e9p kh\u00f4ng g\u1ec9 martensitic, c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u1ed9 c\u1ee9ng r\u1ea5t cao khi x\u1eed l\u00fd nhi\u1ec7t th\u00edch h\u1ee3p, nh\u01b0ng h\u1ea7u h\u1ebft c\u00e1c lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9, ch\u1eb3ng h\u1ea1n nh\u01b0 th\u00e9p kh\u00f4ng g\u1ec9 austenitic, th\u01b0\u1eddng c\u00f3 \u0111\u1ed9 c\u1ee9ng th\u1ea5p h\u01a1n v\u00e0 t\u1eadp trung nhi\u1ec1u h\u01a1n v\u00e0o kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n. Th\u00e9p c\u1ee9ng th\u01b0\u1eddng d\u00f9ng \u0111\u1ec3 ch\u1ec9 th\u00e9p cacbon cao ho\u1eb7c th\u00e9p c\u00f4ng c\u1ee5 h\u1ee3p kim, c\u00f3 \u0111\u1ed9 c\u1ee9ng v\u00e0 \u0111\u1ed9 b\u1ec1n cao h\u01a1n nhi\u1ec1u so v\u1edbi h\u1ea7u h\u1ebft c\u00e1c lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9.<\/p><h2 class=\"wp-block-heading\">Bi\u1ec3u \u0111\u1ed3 \u0111\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9<\/h2><p class=\"wp-block-paragraph\">Sau \u0111\u00e2y l\u00e0 c\u00e1c gi\u00e1 tr\u1ecb \u0111\u1ed9 c\u1ee9ng \u0111i\u1ec3n h\u00ecnh c\u1ee7a m\u1ed9t s\u1ed1 lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 th\u00f4ng d\u1ee5ng. Xin l\u01b0u \u00fd r\u1eb1ng c\u00e1c gi\u00e1 tr\u1ecb \u0111\u1ed9 c\u1ee9ng c\u1ee5 th\u1ec3 c\u00f3 th\u1ec3 thay \u0111\u1ed5i do qu\u00e1 tr\u00ecnh x\u1eed l\u00fd v\u1eadt li\u1ec7u v\u00e0 quy tr\u00ecnh x\u1eed l\u00fd nhi\u1ec7t kh\u00e1c nhau. Ch\u00fang ch\u1ec9 mang t\u00ednh ch\u1ea5t tham kh\u1ea3o. Trong c\u00e1c \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf, n\u00ean x\u00e1c \u0111\u1ecbnh ch\u00fang d\u1ef1a tr\u00ean k\u1ebft qu\u1ea3 th\u1eed nghi\u1ec7m c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u c\u1ee5 th\u1ec3.<\/p><figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>C\u1ea5p<\/td><td>\u0110\u1ed9 c\u1ee9ng Brinell (HB)<\/td><td>\u0110\u1ed9 c\u1ee9ng Rockwell (HRB\/HRC)<\/td><td>\u0110\u1ed9 c\u1ee9ng Vickers (HV)<\/td><\/tr><tr><td>304<\/td><td>123<\/td><td>70 HRB<\/td><td>129<\/td><\/tr><tr><td>304L<\/td><td>123<\/td><td>70 HRB<\/td><td>129<\/td><\/tr><tr><td>316<\/td><td>123<\/td><td>70 HRB<\/td><td>129<\/td><\/tr><tr><td>316L<\/td><td>123<\/td><td>70 HRB<\/td><td>129<\/td><\/tr><tr><td>317L<\/td><td>146<\/td><td>80 HRB<\/td><td>152<\/td><\/tr><tr><td>321<\/td><td>123<\/td><td>70 HRB<\/td><td>129<\/td><\/tr><tr><td>347<\/td><td>123<\/td><td>70 HRB<\/td><td>129<\/td><\/tr><tr><td>405<\/td><td>183<\/td><td>88 HRB<\/td><td>190<\/td><\/tr><tr><td>410<\/td><td>217<\/td><td>95 HRB \/ 22 HRC<\/td><td>229<\/td><\/tr><tr><td>416<\/td><td>262<\/td><td>28 HRC<\/td><td>275<\/td><\/tr><tr><td>420<\/td><td>248<\/td><td>96 HRB \/ 50 HRC<\/td><td>255<\/td><\/tr><tr><td>430<\/td><td>183<\/td><td>88 HRB<\/td><td>190<\/td><\/tr><tr><td>440C<\/td><td>285<\/td><td>29HRC\/58HRC<\/td><td>296<\/td><\/tr><tr><td>17-4PH<\/td><td>353<\/td><td>37 HRC<\/td><td>372<\/td><\/tr><tr><td>2205<\/td><td>293<\/td><td>31 HRC<\/td><td>304<\/td><\/tr><tr><td>2507<\/td><td>277<\/td><td>28 HRC<\/td><td>290<\/td><\/tr><tr><td>S32750<\/td><td>293<\/td><td>31 HRC<\/td><td>304<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\">\u0110\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 so v\u1edbi th\u00e9p cacbon<\/h2><p class=\"wp-block-paragraph\">Th\u00e9p kh\u00f4ng g\u1ec9 v\u00e0 th\u00e9p cacbon c\u00f3 m\u1ed9t s\u1ed1 kh\u00e1c bi\u1ec7t nh\u1ea5t \u0111\u1ecbnh v\u1ec1 \u0111\u1ed9 c\u1ee9ng, ch\u1ee7 y\u1ebfu xu\u1ea5t ph\u00e1t t\u1eeb th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc v\u00e0 c\u1ea5u tr\u00fac vi m\u00f4 kh\u00e1c nhau c\u1ee7a ch\u00fang.<\/p><p class=\"wp-block-paragraph\"><strong>Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc:<\/strong> Th\u00e9p cacbon ch\u1ee7 y\u1ebfu bao g\u1ed3m s\u1eaft v\u00e0 cacbon v\u00e0 c\u00f3 th\u1ec3 ch\u1ee9a m\u1ed9t s\u1ed1 nguy\u00ean t\u1ed1 h\u1ee3p kim \u0111\u1ec3 c\u1ea3i thi\u1ec7n t\u00ednh ch\u1ea5t. Ngo\u00e0i s\u1eaft v\u00e0 cacbon, th\u00e9p kh\u00f4ng g\u1ec9 c\u00f2n b\u1ed5 sung th\u00eam c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim nh\u01b0 crom v\u00e0 niken, c\u00f3 \u1ea3nh h\u01b0\u1edfng quan tr\u1ecdng \u0111\u1ebfn kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n v\u00e0 \u0111\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9.<\/p><p class=\"wp-block-paragraph\"><strong>Ph\u1ea1m vi \u0111\u1ed9 c\u1ee9ng:<\/strong> Th\u00e9p cacbon c\u00f3 ph\u1ea1m vi \u0111\u1ed9 c\u1ee9ng r\u1ed9ng, t\u1eeb th\u1ea5p \u0111\u1ebfn cao. Th\u00e9p kh\u00f4ng g\u1ec9 c\u00f3 \u0111\u1ed9 c\u1ee9ng kh\u00e1c nhau, t\u1eeb th\u1ea5p \u0111\u1ed1i v\u1edbi austenit \u0111\u1ebfn cao \u0111\u1ed1i v\u1edbi martensite v\u00e0 t\u00f4i k\u1ebft t\u1ee7a.<\/p><p class=\"wp-block-paragraph\"><strong>L\u0129nh v\u1ef1c \u1ee9ng d\u1ee5ng:<\/strong> Do kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n tuy\u1ec7t v\u1eddi v\u00e0 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc t\u1ed1t, th\u00e9p kh\u00f4ng g\u1ec9 \u0111\u00e3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p c\u1ea7n xem x\u00e9t kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n v\u00e0 \u0111\u1ed9 c\u1ee9ng c\u00f9ng m\u1ed9t l\u00fac (nh\u01b0 thi\u1ebft b\u1ecb h\u00f3a ch\u1ea5t, m\u00e1y m\u00f3c ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m, v.v.). Th\u00e9p cacbon ph\u1ed5 bi\u1ebfn h\u01a1n trong nh\u1eefng tr\u01b0\u1eddng h\u1ee3p kh\u00f4ng \u0111\u1eb7c bi\u1ec7t quan t\u00e2m \u0111\u1ebfn kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n (nh\u01b0 k\u1ebft c\u1ea5u x\u00e2y d\u1ef1ng, c\u1ea7u, v.v.) v\u00ec chi ph\u00ed th\u1ea5p v\u00e0 hi\u1ec7u su\u1ea5t gia c\u00f4ng t\u1ed1t.<\/p><h2 class=\"wp-block-heading\">\u0110\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 so v\u1edbi nh\u00f4m<\/h2><p class=\"wp-block-paragraph\"><strong>Nh\u00f4m<\/strong>: Th\u01b0\u1eddng m\u1ec1m h\u01a1n th\u00e9p kh\u00f4ng g\u1ec9, v\u1edbi gi\u00e1 tr\u1ecb \u0111\u1ed9 c\u1ee9ng t\u00f9y thu\u1ed9c v\u00e0o h\u1ee3p kim. V\u00ed d\u1ee5, h\u1ee3p kim th\u00f4ng th\u01b0\u1eddng nh\u01b0 6061 c\u00f3 \u0111\u1ed9 c\u1ee9ng kho\u1ea3ng <strong>60 \u0111\u1ebfn 70 HRB<\/strong>, trong khi c\u00e1c h\u1ee3p kim c\u1ee9ng h\u01a1n nh\u01b0 7075 c\u00f3 th\u1ec3 \u0111\u1ea1t t\u1edbi kho\u1ea3ng <strong>90 HRB<\/strong>.<\/p><p class=\"wp-block-paragraph\"><strong>Th\u00e9p kh\u00f4ng g\u1ec9<\/strong>: N\u00f3i chung c\u00f3 \u0111\u1ed9 c\u1ee9ng cao h\u01a1n so v\u1edbi nh\u00f4m. C\u00e1c lo\u1ea1i ph\u1ed5 bi\u1ebfn nh\u01b0 304 v\u00e0 316 th\u01b0\u1eddng c\u00f3 ph\u1ea1m vi t\u1eeb <strong>70 \u0111\u1ebfn 90 HRB<\/strong> (Rockwell B) trong \u0111i\u1ec1u ki\u1ec7n \u1ee7 c\u1ee7a ch\u00fang, trong khi c\u00e1c lo\u1ea1i m\u00e1c th\u00e9p martensitic nh\u01b0 420 v\u00e0 440C c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c <strong>50 \u0111\u1ebfn 65 HRC<\/strong> (Rockwell C) sau khi x\u1eed l\u00fd nhi\u1ec7t.<\/p><h2 class=\"wp-block-heading\">\u0110\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 316 l\u00e0 bao nhi\u00eau?<\/h2><p class=\"wp-block-paragraph\">\u0110\u1ed9 c\u1ee9ng c\u1ee7a <a href=\"https:\/\/steelprogroup.com\/vi\/stainless-steel\/grades\/grade-316\/\">th\u00e9p kh\u00f4ng g\u1ec9 316<\/a> th\u01b0\u1eddng dao \u0111\u1ed9ng t\u1eeb 70 \u0111\u1ebfn 90 HRB (Rockwell B) trong \u0111i\u1ec1u ki\u1ec7n \u1ee7. Khi ch\u1ecbu t\u00e1c \u0111\u1ed9ng c\u1ee7a qu\u00e1 tr\u00ecnh gia c\u00f4ng ngu\u1ed9i ho\u1eb7c c\u00e1c qu\u00e1 tr\u00ecnh kh\u00e1c, \u0111\u1ed9 c\u1ee9ng c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 t\u0103ng l\u00ean, \u0111\u1ea1t kho\u1ea3ng 30 \u0111\u1ebfn 40 HRC (Rockwell C). \u0110\u1ed9 c\u1ee9ng ch\u00ednh x\u00e1c c\u00f3 th\u1ec3 thay \u0111\u1ed5i t\u00f9y theo ph\u01b0\u01a1ng ph\u00e1p gia c\u00f4ng c\u1ee5 th\u1ec3 v\u00e0 t\u00ecnh tr\u1ea1ng c\u1ee7a v\u1eadt li\u1ec7u.<\/p><h2 class=\"wp-block-heading\">\u0110\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 304 l\u00e0 bao nhi\u00eau?<\/h2><p class=\"wp-block-paragraph\">\u0110\u1ed9 c\u1ee9ng c\u1ee7a <a href=\"https:\/\/steelprogroup.com\/vi\/stainless-steel\/grades\/grade-304\/\">th\u00e9p kh\u00f4ng g\u1ec9 304<\/a> th\u01b0\u1eddng dao \u0111\u1ed9ng t\u1eeb 70 \u0111\u1ebfn 90 HRB (Rockwell B) trong \u0111i\u1ec1u ki\u1ec7n \u1ee7. T\u01b0\u01a1ng t\u1ef1 nh\u01b0 th\u00e9p kh\u00f4ng g\u1ec9 316, n\u1ebfu th\u00e9p kh\u00f4ng g\u1ec9 304 tr\u1ea3i qua qu\u00e1 tr\u00ecnh l\u00e0m ngu\u1ed9i ho\u1eb7c c\u00e1c quy tr\u00ecnh kh\u00e1c, \u0111\u1ed9 c\u1ee9ng c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 t\u0103ng l\u00ean, c\u00f3 kh\u1ea3 n\u0103ng \u0111\u1ea1t kho\u1ea3ng 30 \u0111\u1ebfn 40 HRC (Rockwell C). \u0110\u1ed9 c\u1ee9ng ch\u00ednh x\u00e1c c\u00f3 th\u1ec3 thay \u0111\u1ed5i t\u00f9y theo c\u00e1c ph\u01b0\u01a1ng ph\u00e1p v\u00e0 \u0111i\u1ec1u ki\u1ec7n x\u1eed l\u00fd c\u1ee5 th\u1ec3.<\/p><h2 class=\"wp-block-heading\">\u0110\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 18-8 l\u00e0 bao nhi\u00eau?<\/h2><p class=\"wp-block-paragraph\">\u0110\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 304, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 th\u00e9p kh\u00f4ng g\u1ec9 18-8 do th\u00e0nh ph\u1ea7n c\u1ee7a n\u00f3 bao g\u1ed3m kho\u1ea3ng 18% crom v\u00e0 8% niken, th\u01b0\u1eddng dao \u0111\u1ed9ng t\u1eeb 70 \u0111\u1ebfn 90 HRB (Rockwell B) trong \u0111i\u1ec1u ki\u1ec7n \u1ee7. N\u1ebfu gia c\u00f4ng ngu\u1ed9i, \u0111\u1ed9 c\u1ee9ng c\u00f3 th\u1ec3 t\u0103ng l\u00ean kho\u1ea3ng 30 \u0111\u1ebfn 40 HRC (Rockwell C). \u0110\u1ed9 c\u1ee9ng c\u1ee5 th\u1ec3 c\u00f3 th\u1ec3 thay \u0111\u1ed5i t\u00f9y theo ph\u01b0\u01a1ng ph\u00e1p gia c\u00f4ng v\u00e0 t\u00ecnh tr\u1ea1ng c\u1ee7a v\u1eadt li\u1ec7u.<\/p><h2 class=\"wp-block-heading\">\u0110\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 420 l\u00e0 bao nhi\u00eau?<\/h2><p class=\"wp-block-paragraph\">\u0110\u1ed9 c\u1ee9ng c\u1ee7a <a href=\"https:\/\/steelprogroup.com\/vi\/stainless-steel\/grades\/grade-420\/\">th\u00e9p kh\u00f4ng g\u1ec9 420<\/a> th\u01b0\u1eddng dao \u0111\u1ed9ng t\u1eeb <strong>50 \u0111\u1ebfn 60 HRC<\/strong> (Rockwell C) sau khi x\u1eed l\u00fd nhi\u1ec7t. Trong \u0111i\u1ec1u ki\u1ec7n \u1ee7, n\u00f3 th\u01b0\u1eddng c\u00f3 \u0111\u1ed9 c\u1ee9ng kho\u1ea3ng <strong>30 \u0111\u1ebfn 40 HRC<\/strong>\u0110\u1ed9 c\u1ee9ng ch\u00ednh x\u00e1c c\u00f3 th\u1ec3 thay \u0111\u1ed5i t\u00f9y theo ph\u01b0\u01a1ng ph\u00e1p x\u1eed l\u00fd nhi\u1ec7t v\u00e0 ch\u1ebf bi\u1ebfn c\u1ee5 th\u1ec3.<\/p><h2 class=\"wp-block-heading\">Lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 c\u1ee9ng nh\u1ea5t l\u00e0 lo\u1ea1i n\u00e0o?<\/h2><p class=\"wp-block-paragraph\">Lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 c\u1ee9ng nh\u1ea5t th\u01b0\u1eddng \u0111\u01b0\u1ee3c coi l\u00e0 <strong>440C<\/strong>, m\u1ed9t lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 martensitic. N\u00f3 c\u00f3 th\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 c\u1ee9ng kho\u1ea3ng 58 \u0111\u1ebfn 62 HRC (Rockwell C) sau khi x\u1eed l\u00fd nhi\u1ec7t th\u00edch h\u1ee3p. C\u00e1c lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 c\u1ee9ng kh\u00e1c bao g\u1ed3m <strong>420<\/strong> V\u00e0 <strong>AISI 630<\/strong>, nh\u01b0ng 440C th\u01b0\u1eddng \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn nh\u1edd \u0111\u1ed9 c\u1ee9ng v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n v\u01b0\u1ee3t tr\u1ed9i, ph\u00f9 h\u1ee3p cho c\u00e1c \u1ee9ng d\u1ee5ng nh\u01b0 dao v\u00e0 c\u00e1c d\u1ee5ng c\u1ee5 c\u1eaft kh\u00e1c.<\/p><h2 class=\"wp-block-heading\">Nh\u1eadn \u0111\u01b0\u1ee3c th\u00e9p kh\u00f4ng g\u1ec9 nh\u01b0 mong mu\u1ed1n!<\/h2><p class=\"wp-block-paragraph\">SteelPRO Group cung c\u1ea5p cho b\u1ea1n c\u00e1c s\u1ea3n ph\u1ea9m v\u00e0 d\u1ecbch v\u1ee5 ch\u1ea5t l\u01b0\u1ee3ng. Ch\u00fang t\u00f4i c\u00f3 th\u1ec3 s\u1ea3n xu\u1ea5t nhi\u1ec1u lo\u1ea1i <a href=\"https:\/\/steelprogroup.com\/vi\/stainless-steel\/\">th\u00e9p kh\u00f4ng g\u1ec9<\/a> \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u v\u1ec1 \u0111\u1ed9 c\u1ee9ng kh\u00e1c nhau c\u1ee7a b\u1ea1n. N\u1ebfu b\u1ea1n c\u1ea7n mua ho\u1eb7c t\u00f9y ch\u1ec9nh, vui l\u00f2ng <a href=\"https:\/\/steelprogroup.com\/vi\/contact-us\/\">li\u00ean h\u1ec7 v\u1edbi ch\u00fang t\u00f4i<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>L\u00e0 m\u1ed9t ch\u1ec9 s\u1ed1 quan tr\u1ecdng v\u1ec1 kh\u1ea3 n\u0103ng c\u1ee7a v\u1eadt li\u1ec7u, \u0111\u1ed9 c\u1ee9ng r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u00e1nh gi\u00e1 hi\u1ec7u su\u1ea5t v\u00e0 l\u1ef1a ch\u1ecdn \u1ee9ng d\u1ee5ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9. [\u2026]<\/p>","protected":false},"author":1,"featured_media":10668,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_eb_attr":"","rank_math_lock_modified_date":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[4202,112],"tags":[4275],"class_list":["post-10686","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-properties","category-stainless-steel","tag-featured"],"acf":[],"_links":{"self":[{"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/posts\/10686","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/comments?post=10686"}],"version-history":[{"count":0,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/posts\/10686\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/media\/10668"}],"wp:attachment":[{"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/media?parent=10686"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/categories?post=10686"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/tags?post=10686"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}