{"id":19858,"date":"2024-12-13T04:40:00","date_gmt":"2024-12-12T20:40:00","guid":{"rendered":"https:\/\/steelprogroup.com\/?p=19858"},"modified":"2024-12-12T17:34:20","modified_gmt":"2024-12-12T09:34:20","slug":"a7","status":"publish","type":"post","link":"https:\/\/steelprogroup.com\/vi\/tool-steel\/grades\/a7\/","title":{"rendered":"Th\u00e9p c\u00f4ng c\u1ee5 AISI A7: T\u00ednh ch\u1ea5t, X\u1eed l\u00fd nhi\u1ec7t, C\u00f4ng d\u1ee5ng, D\u1eef li\u1ec7u ch\u00ednh"},"content":{"rendered":"<p>M\u1ed9t nh\u00f3m th\u00e9p c\u00f4ng c\u1ee5 l\u00e0 th\u00e9p l\u00e0m ngu\u1ed9i h\u1ee3p kim trung b\u00ecnh, t\u00f4i b\u1eb1ng kh\u00f4ng kh\u00ed c\u00f3 h\u00e0m l\u01b0\u1ee3ng cacbon cao (0,5%-2%). Nh\u1eefng lo\u1ea1i th\u00e9p n\u00e0y \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn v\u00ec \u0111\u1ed9 c\u1ee9ng, kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng n\u1ee9t ho\u1eb7c bi\u1ebfn d\u1ea1ng trong qu\u00e1 tr\u00ecnh t\u00f4i.<\/p><p>B\u00e0i vi\u1ebft n\u00e0y t\u1eadp trung v\u00e0o th\u00e9p c\u00f4ng c\u1ee5 A7, bao g\u1ed3m c\u00e1c t\u00ednh ch\u1ea5t, x\u1eed l\u00fd nhi\u1ec7t, \u1ee9ng d\u1ee5ng v\u00e0 c\u00e1c d\u1ea1ng s\u1ea3n ph\u1ea9m c\u00f3 s\u1eb5n.<\/p><h2 class=\"wp-block-heading\">Th\u00e9p c\u00f4ng c\u1ee5 A7 l\u00e0 g\u00ec?<\/h2><p>Th\u00e9p c\u00f4ng c\u1ee5 A7 l\u00e0 th\u00e9p l\u00e0m ngu\u1ed9i, t\u00f4i b\u1eb1ng kh\u00f4ng kh\u00ed, c\u00f3 h\u00e0m l\u01b0\u1ee3ng cacbon cao, \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn v\u00ec kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n v\u01b0\u1ee3t tr\u1ed9i v\u00e0 \u0111\u1ed9 \u0111\u1ed3ng nh\u1ea5t v\u1ec1 k\u00edch th\u01b0\u1edbc \u0111\u1eb7c bi\u1ec7t. \u0110\u01b0\u1ee3c t\u1ea1o th\u00e0nh t\u1eeb coban, crom, vanadi v\u00e0 molypden, n\u00f3 t\u1ea1o th\u00e0nh c\u00e1c h\u1ea1t cacbua vanadi c\u1ee9ng c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n v\u00e0 ti\u1ebfp x\u00fac tr\u01b0\u1ee3t. A7 c\u00f3 \u0111\u1ed9 d\u1ebbo dai th\u1ea5p h\u01a1n so v\u1edbi c\u00e1c lo\u1ea1i th\u00e9p c\u00f4ng c\u1ee5 kh\u00e1c. N\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c c\u00f4ng c\u1ee5 t\u1ea1o h\u00ecnh ngu\u1ed9i, khu\u00f4n \u0111\u00f9n, \u0111\u1ed9t v\u00e0 khu\u00f4n r\u00e8n, v\u1edbi ph\u1ea1m vi \u0111\u1ed9 c\u1ee9ng \u0111i\u1ec3n h\u00ecnh t\u1eeb 50 \u0111\u1ebfn 65 HRC sau khi x\u1eed l\u00fd nhi\u1ec7t.<\/p><p>SteelPro Group cung c\u1ea5p c\u00e1c s\u1ea3n ph\u1ea9m th\u00e9p c\u00f4ng c\u1ee5 A7, t\u01b0\u01a1ng \u0111\u01b0\u01a1ng v\u1edbi UNS T30107 v\u00e0 tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n ASTM A681. C\u00f3 s\u1eb5n \u1edf d\u1ea1ng thanh, t\u1ea5m, tr\u00f2n v\u00e0 t\u1ea5m, c\u00e1c s\u1ea3n ph\u1ea9m n\u00e0y \u0111\u00e1p \u1ee9ng c\u00e1c nhu c\u1ea7u c\u00f4ng nghi\u1ec7p \u0111a d\u1ea1ng. C\u00e1c k\u00edch th\u01b0\u1edbc t\u00f9y ch\u1ec9nh v\u00e0 h\u00ecnh d\u1ea1ng r\u00e8n c\u0169ng c\u00f3 s\u1eb5n theo y\u00eau c\u1ea7u.<\/p><h2 class=\"wp-block-heading\">Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc c\u1ee7a th\u00e9p c\u00f4ng c\u1ee5 A7&nbsp;<\/h2><p>Th\u00e9p c\u00f4ng c\u1ee5 A7 c\u00f3 th\u00e0nh ph\u1ea7n h\u1ee3p kim cao, h\u00e0m l\u01b0\u1ee3ng cacbon cao \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 c\u00f3 \u0111\u1ed9 c\u1ee9ng v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n \u0111\u1eb7c bi\u1ec7t. Vi\u1ec7c b\u1ed5 sung vanadi v\u00e0 vonfram gi\u00fap t\u0103ng kh\u1ea3 n\u0103ng gi\u1eef nguy\u00ean ti\u00ean ti\u1ebfn, trong khi h\u00e0m l\u01b0\u1ee3ng mangan v\u00e0 silic \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t gi\u00fap c\u1ea3i thi\u1ec7n \u0111\u1ed9 b\u1ec1n v\u00e0 kh\u1ea3 n\u0103ng gia c\u00f4ng.&nbsp;<\/p><p>B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y ph\u00e1c th\u1ea3o th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc c\u1ee7a th\u00e9p c\u00f4ng c\u1ee5 A7.<\/p><figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Y\u1ebfu t\u1ed1<\/strong><\/td><td><strong>Th\u00e0nh ph\u1ea7n (%)<\/strong><\/td><\/tr><tr><td>Cacbon (C)<\/td><td>2.0 &#8211; 2.85<\/td><\/tr><tr><td>Crom (Cr)<\/td><td>5.38<\/td><\/tr><tr><td>S\u1eaft (Fe)<\/td><td>84<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>\u2264 0,80<\/td><\/tr><tr><td>Molip\u0111en (Mo)<\/td><td>1.15<\/td><\/tr><tr><td>Ph\u1ed1t pho (P)<\/td><td>\u2264 0,030<\/td><\/tr><tr><td>Silic (Si)<\/td><td>\u2264 0,50<\/td><\/tr><tr><td>L\u01b0u hu\u1ef3nh (S)<\/td><td>\u2264 0,030<\/td><\/tr><tr><td>Vonfram (W)<\/td><td>1, t\u00f9y ch\u1ecdn<\/td><\/tr><tr><td>Vanadi (V)<\/td><td>4.53<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\">T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc c\u1ee7a th\u00e9p c\u00f4ng c\u1ee5 A7&nbsp;<\/h2><p>Th\u00e9p c\u00f4ng c\u1ee5 A7 cung c\u1ea5p s\u1ef1 c\u00e2n b\u1eb1ng m\u1ea1nh m\u1ebd gi\u1eefa \u0111\u1ed9 c\u1ee9ng v\u00e0 \u0111\u1ed9 c\u1ee9ng, mang l\u1ea1i kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n t\u1ed1t nh\u01b0ng \u0111\u00f2i h\u1ecfi ph\u1ea3i gia c\u00f4ng c\u1ea9n th\u1eadn do ph\u1ea1m vi \u0111\u1ed9 c\u1ee9ng c\u1ee7a n\u00f3. \u0110\u1ed9 \u0111\u00e0n h\u1ed3i v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng c\u1eaft c\u1ee7a n\u00f3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 tin c\u1eady khi ch\u1ecbu \u1ee9ng su\u1ea5t.&nbsp;<\/p><p>B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y t\u00f3m t\u1eaft c\u00e1c t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc ch\u00ednh c\u1ee7a n\u00f3.<\/p><figure class=\"wp-block-table\"><table><tbody><tr><td><strong>T\u00e0i s\u1ea3n<\/strong><\/td><td><strong>Gi\u00e1 tr\u1ecb s\u1ed1 li\u1ec7u<\/strong><\/td><td><strong>Gi\u00e1 tr\u1ecb \u0110\u1ebf qu\u1ed1c<\/strong><\/td><\/tr><tr><td>\u0110\u1ed9 c\u1ee9ng, Rockwell C<\/td><td>58.0 &#8211; 66.0<\/td><td>58.0 &#8211; 66.0<\/td><\/tr><tr><td>Kh\u1ea3 n\u0103ng gia c\u00f4ng<\/td><td>65%<\/td><td>65%<\/td><\/tr><tr><td>T\u1ef7 s\u1ed1 Poisson<\/td><td>0.27 &#8211; 0.30<\/td><td>0.27 &#8211; 0.30<\/td><\/tr><tr><td>M\u00f4 \u0111un c\u1eaft<\/td><td>80,0 GPa<\/td><td>11.600 kil\u00f4gam<\/td><\/tr><tr><td>M\u00f4 \u0111un kh\u1ed1i<\/td><td>140 GPa<\/td><td>20.300 kil\u00f4gam<\/td><\/tr><tr><td>M\u00f4 \u0111un \u0111\u00e0n h\u1ed3i<\/td><td>190 \u2013 210 GPa<\/td><td>27.557 \u2013 30.457 ksi<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\">T\u00ednh ch\u1ea5t v\u1eadt l\u00fd c\u1ee7a th\u00e9p c\u00f4ng c\u1ee5 A7<\/h2><p>Th\u00e9p c\u00f4ng c\u1ee5 A7 th\u1ec3 hi\u1ec7n t\u00ednh \u1ed5n \u0111\u1ecbnh v\u1eadt l\u00fd tuy\u1ec7t v\u1eddi, v\u1edbi m\u1eadt \u0111\u1ed9 cao v\u00e0 \u0111\u1ed9 gi\u00e3n n\u1edf nhi\u1ec7t v\u1eeba ph\u1ea3i, \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t \u0111\u00e1ng tin c\u1eady \u1edf nhi\u1ec7t \u0111\u1ed9 kh\u00e1c nhau. \u0110\u1ed9 d\u1eabn nhi\u1ec7t v\u00e0 nhi\u1ec7t dung ri\u00eang c\u1ee7a n\u00f3 h\u1ed7 tr\u1ee3 qu\u1ea3n l\u00fd nhi\u1ec7t hi\u1ec7u qu\u1ea3.<\/p><p>B\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y tr\u00ecnh b\u00e0y t\u1ed5ng quan v\u1ec1 c\u00e1c \u0111\u1eb7c \u0111i\u1ec3m v\u1eadt l\u00fd c\u1ea7n thi\u1ebft c\u1ee7a n\u00f3.<\/p><figure class=\"wp-block-table\"><table><tbody><tr><td><strong>T\u00e0i s\u1ea3n<\/strong><\/td><td><strong>Gi\u00e1 tr\u1ecb s\u1ed1 li\u1ec7u<\/strong><\/td><td><strong>Gi\u00e1 tr\u1ecb \u0110\u1ebf qu\u1ed1c<\/strong><\/td><\/tr><tr><td>T\u1ec9 tr\u1ecdng<\/td><td>7,66g\/cm\u00b3<\/td><td>0,277 lb\/in\u00b3<\/td><\/tr><tr><td>\u0110i\u1ec3m n\u00f3ng ch\u1ea3y<\/td><td>1427\u00b0C<\/td><td>2600\u00b0F<\/td><\/tr><tr><td>H\u1ec7 s\u1ed1 gi\u00e3n n\u1edf nhi\u1ec7t<\/td><td>12,4 \u00b5m\/m\u00b7\u00b0C<\/td><td>6,89 \u00b5in\/in\u00b7\u00b0F<\/td><\/tr><tr><td>\u0110\u1ed9 d\u1eabn nhi\u1ec7t<\/td><td>37 W\/m\u00b7K<\/td><td>21,4 BTU\u00b7in\/ft\u00b2\u00b7h\u00b7\u00b0F<\/td><\/tr><tr><td>Nhi\u1ec7t dung ri\u00eang<\/td><td>470 J\/kg\u00b7K<\/td><td>0,112 BTU\/lb\u00b7\u00b0F<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\">Ch\u1ebf t\u1ea1o th\u00e9p c\u00f4ng c\u1ee5 A7 v\u00e0 x\u1eed l\u00fd nhi\u1ec7t<\/h2><p>X\u1eed l\u00fd nhi\u1ec7t \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn \u0111\u1ed9 c\u1ee9ng v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n c\u1ee7a th\u00e9p c\u00f4ng c\u1ee5 A7. B\u1eb1ng c\u00e1ch thay \u0111\u1ed5i th\u1eddi gian v\u00e0 nhi\u1ec7t \u0111\u1ed9 t\u00f4i luy\u1ec7n, \u0111\u1ed9 c\u1ee9ng c\u1ee7a n\u00f3 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a \u0111\u1ec3 c\u00f3 \u0111\u1ed9 b\u1ec1n v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng bi\u1ebfn d\u1ea1ng.<\/p><p>Ch\u00fang t\u00f4i cung c\u1ea5p th\u00e9p c\u00f4ng c\u1ee5 A7 \u1edf d\u1ea1ng \u1ee7, t\u00f4i v\u00e0 ram, c\u0169ng nh\u01b0 \u1edf tr\u1ea1ng th\u00e1i th\u01b0\u1eddng h\u00f3a v\u00e0 c\u00e1n, \u0111\u1ea3m b\u1ea3o t\u00ednh linh ho\u1ea1t cho nhi\u1ec1u y\u00eau c\u1ea7u gia c\u00f4ng v\u00e0 \u1ee9ng d\u1ee5ng kh\u00e1c nhau.<\/p><h3 class=\"wp-block-heading\">R\u00e8n<\/h3><p>Ph\u1ea1m vi nhi\u1ec7t \u0111\u1ed9 \u0111\u01b0\u1ee3c khuy\u1ebfn ngh\u1ecb cho th\u00e9p c\u00f4ng c\u1ee5 A7 l\u00e0 t\u1eeb 982\u00b0C (1800\u00b0F) \u0111\u1ebfn 1204\u00b0C (2200\u00b0F). Kh\u00f4ng n\u00ean r\u00e8n th\u00e9p d\u01b0\u1edbi 982\u00b0C (1800\u00b0F) v\u00ec v\u1eadt li\u1ec7u s\u1ebd tr\u1edf n\u00ean qu\u00e1 gi\u00f2n v\u00e0 d\u1ec5 n\u1ee9t, l\u00e0m gi\u1ea3m kh\u1ea3 n\u0103ng bi\u1ebfn d\u1ea1ng c\u1ee7a th\u00e9p.<\/p><h3 class=\"wp-block-heading\">\u1ee6<\/h3><p>Sau khi gia c\u00f4ng n\u00f3ng v\u00e0 tr\u01b0\u1edbc khi t\u00f4i l\u1ea1i, th\u00e9p c\u00f4ng c\u1ee5 A7 ph\u1ea3i tr\u1ea3i qua qu\u00e1 tr\u00ecnh \u1ee7 \u0111\u1ec3 gi\u1ea3m \u1ee9ng su\u1ea5t b\u00ean trong v\u00e0 c\u1ea3i thi\u1ec7n kh\u1ea3 n\u0103ng gia c\u00f4ng. \u0110\u1ed9 c\u1ee9ng sau khi \u1ee7 th\u01b0\u1eddng l\u00e0 235-255 HB.<\/p><p>Sau khi gia c\u00f4ng n\u00f3ng v\u00e0 tr\u01b0\u1edbc khi t\u00f4i l\u1ea1i, th\u00e9p c\u00f4ng c\u1ee5 A7 ph\u1ea3i \u0111\u01b0\u1ee3c \u1ee7. L\u00e0m n\u00f3ng \u1edf t\u1ed1c \u0111\u1ed9 100-150\u00b0F (56-83\u00b0C) m\u1ed7i gi\u1edd \u0111\u1ebfn 1600\u00b0F (871\u00b0C). \u0110\u1ed1i v\u1edbi m\u1ed7i \u0111\u1ed9 d\u00e0y 25,4mm (1 inch), duy tr\u00ec nhi\u1ec7t \u0111\u1ed9 trong 1 gi\u1edd. L\u00e0m ngu\u1ed9i ch\u1eadm \u1edf t\u1ed1c \u0111\u1ed9 20-25\u00b0F (11-14\u00b0C) m\u1ed7i gi\u1edd \u0111\u1ec3 tr\u00e1nh s\u1ed1c nhi\u1ec7t, sau \u0111\u00f3 \u0111\u1ec3 th\u00e9p ngu\u1ed9i \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng trong l\u00f2.&nbsp;<\/p><h3 class=\"wp-block-heading\">L\u00e0m c\u1ee9ng<\/h3><ul class=\"wp-block-list\"><li><strong>Austenit h\u00f3a<\/strong><\/li><\/ul><p>L\u00e0m n\u00f3ng \u0111\u1ebfn 1700-1750\u00b0F (927-954\u00b0C). \u0110\u1ec3 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n t\u1ed1i \u0111a, h\u00e3y s\u1eed d\u1ee5ng 1750\u00b0F (954\u00b0C); \u0111\u1ec3 c\u00f3 \u0111\u1ed9 b\u1ec1n t\u1ed1i \u01b0u, h\u00e3y s\u1eed d\u1ee5ng 1700\u00b0F (927\u00b0C). Gi\u1eef trong 30-60 ph\u00fat cho m\u1ed7i 25,4mm (1 inch) \u0111\u1ed9 d\u00e0y.<\/p><ul class=\"wp-block-list\"><li><strong>L\u00e0m ngu\u1ed9i<\/strong><\/li><\/ul><p>Sau khi austenit h\u00f3a, l\u00e0m ngu\u1ed9i \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng (kho\u1ea3ng 70\u00b0F\/21\u00b0C) trong d\u1ea7u ho\u1eb7c kh\u00f4ng kh\u00ed, t\u00f9y thu\u1ed9c v\u00e0o \u0111\u1ed9 d\u00e0y c\u1ee7a ti\u1ebft di\u1ec7n. T\u1ed1c \u0111\u1ed9 l\u00e0m ngu\u1ed9i ph\u1ea3i \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t \u1edf m\u1ee9c 20-25\u00b0F (11-14\u00b0C) m\u1ed7i ph\u00fat \u0111\u1ec3 tr\u00e1nh n\u1ee9t.<\/p><p>\u0110\u1ed1i v\u1edbi c\u00e1c ph\u1ea7n c\u00f3 \u0111\u1ed9 d\u00e0y l\u00ean \u0111\u1ebfn 25,4mm (1 inch), t\u00f4i \u1edf nhi\u1ec7t \u0111\u1ed9 1500\u00b0F (815\u00b0C); \u0111\u1ed1i v\u1edbi c\u00e1c ph\u1ea7n d\u00e0y h\u01a1n tr\u00ean 50,8mm (2 inch), t\u00f4i \u1edf nhi\u1ec7t \u0111\u1ed9 1600\u00b0F (871\u00b0C) \u0111\u1ebfn 1650\u00b0F (899\u00b0C).<\/p><h3 class=\"wp-block-heading\">L\u00e0m ngu\u1ed9i<\/h3><p>Sau khi t\u00f4i, th\u00e9p c\u00f4ng c\u1ee5 A7 tr\u1ea3i qua qu\u00e1 tr\u00ecnh t\u00f4i luy\u1ec7n \u0111\u1ec3 gi\u1ea3m \u0111\u1ed9 gi\u00f2n v\u00e0 \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 c\u1ee9ng m\u1ee5c ti\u00eau. Th\u00e9p ph\u1ea3i \u0111\u01b0\u1ee3c t\u00f4i luy\u1ec7n \u1edf nhi\u1ec7t \u0111\u1ed9 400-1100\u00b0F (204-593\u00b0C) trong 1 gi\u1edd cho m\u1ed7i \u0111\u1ed9 d\u00e0y 25,4mm (1 inch).<\/p><p>N\u1ebfu m\u1ed9t <strong>t\u00f4i luy\u1ec7n th\u1ee9 c\u1ea5p<\/strong> \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n, th\u00f4ng th\u01b0\u1eddng l\u00e0 \u0111\u1ec3 tinh ch\u1ec9nh th\u00eam \u0111\u1ed9 c\u1ee9ng c\u1ee7a th\u00e9p v\u00e0 c\u1ea3i thi\u1ec7n \u0111\u1ed9 d\u1ebbo dai. \u0110\u1ec3 c\u00f3 \u0111\u1ed9 d\u1ebbo dai t\u1ed1i \u0111a, h\u00e3y th\u1ef1c hi\u1ec7n l\u1ea7n t\u00f4i th\u1ee9 hai \u1edf nhi\u1ec7t \u0111\u1ed9 tr\u00ean 900\u00b0F (482\u00b0C) trong 2 gi\u1edd, sau \u0111\u00f3 l\u00e0 chu k\u1ef3 t\u00f4i trong 2 gi\u1edd.<\/p><p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u1ea3ng tr\u00ecnh b\u00e0y d\u1eef li\u1ec7u \u0111\u1ed9 c\u1ee9ng d\u1ef1a tr\u00ean th\u1eddi gian v\u00e0 nhi\u1ec7t \u0111\u1ed9 t\u00f4i luy\u1ec7n:<\/p><figure class=\"wp-block-table\"><table><tbody><tr><td><strong>\u0110\u1ed9 c\u1ee9ng (HRC)<\/strong><\/td><td><strong>Nhi\u1ec7t \u0111\u1ed9<\/strong><\/td><td><strong>Th\u1eddi gian<\/strong><\/td><\/tr><tr><td>44 &#8211; 46<\/td><td>650\u00b0C (1200\u00b0F)<\/td><td>3 gi\u1edd<\/td><\/tr><tr><td>53 &#8211; 55<\/td><td>595\u00b0C (1100\u00b0F)<\/td><td>3 gi\u1edd<\/td><\/tr><tr><td>56 &#8211; 58<\/td><td>540\u00b0C (1000\u00b0F)<\/td><td>3 gi\u1edd<\/td><\/tr><tr><td>59 &#8211; 61<\/td><td>425\u00b0C (797\u00b0F)<\/td><td>3 gi\u1edd<\/td><\/tr><tr><td>61 &#8211; 63<\/td><td>315\u00b0C (599\u00b0F)<\/td><td>3 gi\u1edd<\/td><\/tr><tr><td>62 &#8211; 64<\/td><td>260\u00b0C (500\u00b0F)<\/td><td>3 gi\u1edd<\/td><\/tr><tr><td>64 &#8211; 65<\/td><td>150\u00b0C (302\u00b0F)<\/td><td>3 gi\u1edd<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\">Gia c\u00f4ng th\u00e9p c\u00f4ng c\u1ee5 A7<\/h2><h3 class=\"wp-block-heading\">H\u00ecnh th\u00e0nh<\/h3><p>\u0110\u1ed9 c\u1ee9ng cao c\u1ee7a th\u00e9p c\u00f4ng c\u1ee5 A7 cho ph\u00e9p n\u00f3 duy tr\u00ec h\u00ecnh d\u1ea1ng trong qu\u00e1 tr\u00ecnh t\u1ea1o h\u00ecnh nh\u01b0ng c\u1ea7n ph\u1ea3i gia nhi\u1ec7t c\u1ea9n th\u1eadn \u0111\u1ec3 tr\u00e1nh n\u1ee9t. T\u00ednh ch\u1ea5t l\u00e0m c\u1ee9ng b\u1eb1ng kh\u00f4ng kh\u00ed c\u1ee7a n\u00f3 \u0111\u1ea3m b\u1ea3o t\u00ednh \u1ed5n \u0111\u1ecbnh v\u1ec1 k\u00edch th\u01b0\u1edbc trong qu\u00e1 tr\u00ecnh gia c\u00f4ng.<\/p><h3 class=\"wp-block-heading\">C\u1eaft<\/h3><p>Vi\u1ec7c c\u1eaft A7 r\u1ea5t kh\u00f3 kh\u0103n do \u0111\u1ed9 c\u1ee9ng c\u1ee7a n\u00f3, \u0111\u00f2i h\u1ecfi c\u00e1c c\u00f4ng c\u1ee5 c\u1eaft ch\u1ea5t l\u01b0\u1ee3ng cao v\u00e0 \u0111i\u1ec1u ki\u1ec7n gia c\u00f4ng t\u1ed1i \u01b0u. T\u1ed1c \u0111\u1ed9 v\u00e0 b\u01b0\u1edbc ti\u1ebfn th\u00edch h\u1ee3p l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 tr\u00e1nh m\u00e0i m\u00f2n c\u00f4ng c\u1ee5 v\u00e0 t\u00edch t\u1ee5 nhi\u1ec7t.<\/p><h3 class=\"wp-block-heading\">L\u00e0m vi\u1ec7c l\u1ea1nh<\/h3><p>Kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n c\u1ee7a A7 khi\u1ebfn n\u00f3 ph\u00f9 h\u1ee3p \u0111\u1ec3 gia c\u00f4ng ngu\u1ed9i, m\u1eb7c d\u00f9 \u0111\u1ed9 c\u1ee9ng c\u1ee7a n\u00f3 \u0111\u00f2i h\u1ecfi c\u00e1c c\u00f4ng c\u1ee5 chuy\u00ean d\u1ee5ng. C\u00e1c quy tr\u00ecnh t\u1ea1o h\u00ecnh ngu\u1ed9i nh\u01b0 \u0111\u1ed9t d\u1eadp ho\u1eb7c d\u1eadp c\u1ea7n \u0111\u01b0\u1ee3c x\u1eed l\u00fd c\u1ea9n th\u1eadn \u0111\u1ec3 tr\u00e1nh n\u1ee9t ho\u1eb7c m\u00e0i m\u00f2n d\u1ee5ng c\u1ee5 qu\u00e1 m\u1ee9c.<\/p><h2 class=\"wp-block-heading\">M\u1eabu s\u1ea3n ph\u1ea9m th\u00e9p c\u00f4ng c\u1ee5 A7<\/h2><p>N\u1ed9i dung sau \u0111\u00e2y ph\u00e1c th\u1ea3o c\u00e1c h\u00ecnh d\u1ea1ng v\u00e0 k\u00edch th\u01b0\u1edbc s\u1ea3n ph\u1ea9m ti\u00eau bi\u1ec3u c\u1ee7a th\u00e9p c\u00f4ng c\u1ee5 A7, \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 \u0111\u00e1p \u1ee9ng nhi\u1ec1u \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p kh\u00e1c nhau.&nbsp;<\/p><p>N\u1ebfu b\u1ea1n y\u00eau c\u1ea7u k\u00edch th\u01b0\u1edbc ngo\u00e0i ph\u1ea1m vi ti\u00eau chu\u1ea9n, SteelPro Group c\u00f3 th\u1ec3 th\u1ef1c hi\u1ec7n c\u00e1c \u0111\u01a1n \u0111\u1eb7t h\u00e0ng t\u00f9y ch\u1ec9nh \u0111\u1ec3 \u0111\u00e1p \u1ee9ng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a b\u1ea1n. Ngo\u00e0i ra, n\u1ebfu b\u1ea1n c\u1ea7n h\u00ecnh d\u1ea1ng r\u00e8n theo y\u00eau c\u1ea7u, vui l\u00f2ng li\u00ean h\u1ec7 v\u1edbi ch\u00fang t\u00f4i \u0111\u1ec3 c\u00f3 gi\u1ea3i ph\u00e1p ri\u00eang.<\/p><h3 class=\"wp-block-heading\">Thanh<\/h3><ul class=\"wp-block-list\"><li>\u0110\u01b0\u1eddng k\u00ednh: 20mm (0,8 inch) \u0111\u1ebfn 300mm (12 inch)<\/li>\n\n<li>Chi\u1ec1u d\u00e0i: L\u00ean \u0111\u1ebfn 2000mm (79 inch)<\/li><\/ul><h3 class=\"wp-block-heading\">\u0110\u0129a<\/h3><ul class=\"wp-block-list\"><li>\u0110\u1ed9 d\u00e0y: 10mm (0,4 inch) \u0111\u1ebfn 100mm (4 inch)<\/li>\n\n<li>Chi\u1ec1u r\u1ed9ng: L\u00ean \u0111\u1ebfn 2000mm (79 inch)<\/li>\n\n<li>Chi\u1ec1u d\u00e0i: L\u00ean \u0111\u1ebfn 2000mm (79 inch)<\/li><\/ul><h3 class=\"wp-block-heading\">V\u00f2ng tr\u00f2n<\/h3><ul class=\"wp-block-list\"><li>\u0110\u01b0\u1eddng k\u00ednh: 25mm (1 inch) \u0111\u1ebfn 350mm (14 inch)<\/li>\n\n<li>Chi\u1ec1u d\u00e0i: L\u00ean \u0111\u1ebfn 2000mm (79 inch)<\/li><\/ul><h3 class=\"wp-block-heading\">T\u1ea5m tr\u1ea3i gi\u01b0\u1eddng<\/h3><ul class=\"wp-block-list\"><li>\u0110\u1ed9 d\u00e0y: 5mm (0,2 inch) \u0111\u1ebfn 50mm (2 inch)<\/li>\n\n<li>Chi\u1ec1u r\u1ed9ng: L\u00ean \u0111\u1ebfn 1500mm (59 inch)<\/li>\n\n<li>Chi\u1ec1u d\u00e0i: L\u00ean \u0111\u1ebfn 2000mm (79 inch)<\/li><\/ul><h2 class=\"wp-block-heading\">\u1ee8ng d\u1ee5ng th\u00e9p c\u00f4ng c\u1ee5 A7<\/h2><p>Th\u00e9p c\u00f4ng c\u1ee5 A7 \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u1edbi \u0111\u1ed9 c\u1ee9ng, kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n v\u00e0 \u0111\u1ed9 b\u1ec1n cao, \u0111\u1eb7c bi\u1ec7t ph\u00f9 h\u1ee3p cho c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u00f2i h\u1ecfi \u0111\u1ed9 b\u1ec1n v\u00e0 \u0111\u1ed9 d\u1ebbo dai d\u01b0\u1edbi \u1ee9ng su\u1ea5t c\u01a1 h\u1ecdc l\u1edbn.&nbsp;<\/p><ul class=\"wp-block-list\"><li>Khu\u00f4n \u0111\u00fac v\u00e0 \u0111\u00f9n<\/li>\n\n<li>D\u1ee5ng c\u1ee5 l\u00e0m vi\u1ec7c ngu\u1ed9i<\/li>\n\n<li>Khu\u00f4n r\u00e8n<\/li>\n\n<li>D\u1ee5ng c\u1ee5 c\u1eaft v\u00e0 gia c\u00f4ng<\/li>\n\n<li>D\u1ee5ng c\u1ee5 cho qu\u00e1 tr\u00ecnh n\u00e9n b\u1ed9t<\/li>\n\n<li>Linh ki\u1ec7n m\u00e1y c\u00f4ng c\u1ee5<\/li>\n\n<li>Khu\u00f4n m\u1eabu v\u00e0 \u0111\u1ed3ng h\u1ed3 \u0111o chuy\u00ean d\u1ee5ng<\/li><\/ul><h2 class=\"wp-block-heading\">Ngu\u1ed3n \u0111\u00e1ng tin c\u1eady cho c\u00e1c gi\u1ea3i ph\u00e1p th\u00e9p c\u00f4ng c\u1ee5 A7<\/h2><p>SteelPro Group cung c\u1ea5p m\u1ed9t lo\u1ea1t c\u00e1c s\u1ea3n ph\u1ea9m th\u00e9p c\u00f4ng c\u1ee5 A7 to\u00e0n di\u1ec7n \u0111\u1ec3 \u0111\u00e1p \u1ee9ng c\u00e1c nhu c\u1ea7u c\u00f4ng nghi\u1ec7p \u0111a d\u1ea1ng. C\u00e1c s\u1ea3n ph\u1ea9m c\u1ee7a ch\u00fang t\u00f4i bao g\u1ed3m thanh, t\u1ea5m, tr\u00f2n v\u00e0 t\u1ea5m, c\u00f3 nhi\u1ec1u k\u00edch c\u1ee1 kh\u00e1c nhau \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng kh\u00e1c nhau. \u0110\u1ed1i v\u1edbi kh\u00e1ch h\u00e0ng c\u00f3 y\u00eau c\u1ea7u ri\u00eang, ch\u00fang t\u00f4i chuy\u00ean v\u1ec1 c\u00e1c gi\u1ea3i ph\u00e1p t\u00f9y ch\u1ec9nh.<\/p><p>Ngo\u00e0i ph\u1ea1m vi s\u1ea3n ph\u1ea9m c\u1ee7a ch\u00fang t\u00f4i, SteelPro Group c\u00f2n cung c\u1ea5p d\u1ecbch v\u1ee5 t\u01b0 v\u1ea5n chuy\u00ean m\u00f4n \u0111\u1ec3 gi\u00fap b\u1ea1n l\u1ef1a ch\u1ecdn \u0111\u00fang lo\u1ea1i th\u00e9p c\u00f4ng c\u1ee5 cho \u1ee9ng d\u1ee5ng c\u1ee7a m\u00ecnh. Cho d\u00f9 b\u1ea1n c\u1ea7n h\u1ed7 tr\u1ee3 l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u, \u0111\u01a1n \u0111\u1eb7t h\u00e0ng t\u00f9y ch\u1ec9nh hay h\u1ed7 tr\u1ee3 k\u1ef9 thu\u1eadt, nh\u00f3m c\u1ee7a ch\u00fang t\u00f4i lu\u00f4n \u1edf \u0111\u00e2y \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o d\u1ef1 \u00e1n c\u1ee7a b\u1ea1n th\u00e0nh c\u00f4ng.<\/p><p><\/p>","protected":false},"excerpt":{"rendered":"<p>A group of tool steels are air-hardening, medium-alloy cold-work steels with high carbon content (0.5%-2%). These steels are recognized for [&hellip;]<\/p>","protected":false},"author":12,"featured_media":19841,"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":[4294,4293],"tags":[],"class_list":["post-19858","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-grades-tool-steel","category-tool-steel"],"acf":[],"_links":{"self":[{"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/posts\/19858","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\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/comments?post=19858"}],"version-history":[{"count":0,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/posts\/19858\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/media\/19841"}],"wp:attachment":[{"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/media?parent=19858"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/categories?post=19858"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/tags?post=19858"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}