{"id":21213,"date":"2025-03-03T07:26:00","date_gmt":"2025-03-02T23:26:00","guid":{"rendered":"https:\/\/steelprogroup.com\/?p=21213"},"modified":"2025-03-04T17:56:15","modified_gmt":"2025-03-04T09:56:15","slug":"4340-steel","status":"publish","type":"post","link":"https:\/\/steelprogroup.com\/vi\/alloy-steel\/4340-steel\/","title":{"rendered":"Th\u00e9p AISI 4340: T\u00ednh ch\u1ea5t, S\u1ea3n ph\u1ea9m v\u00e0 C\u00f4ng d\u1ee5ng"},"content":{"rendered":"<p>Th\u00e9p h\u1ee3p kim 4340 \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u1edbi t\u00ednh linh ho\u1ea1t v\u00e0 \u0111\u1ed9 b\u1ec1n, khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn l\u00fd t\u01b0\u1edfng cho c\u00e1c th\u00e0nh ph\u1ea7n hi\u1ec7u su\u1ea5t cao nh\u01b0 b\u00e1nh r\u0103ng v\u00e0 tr\u1ee5c. T\u1ea1i SteelPro Group, ch\u00fang t\u00f4i \u0111\u00e3 d\u00e0nh nhi\u1ec1u th\u1eadp k\u1ef7 \u0111\u1ec3 tinh ch\u1ec9nh quy tr\u00ecnh s\u1ea3n xu\u1ea5t c\u1ee7a m\u00ecnh \u0111\u1ec3 khai th\u00e1c h\u1ebft ti\u1ec1m n\u0103ng c\u1ee7a th\u00e9p 4340.<\/p><p>Trong c\u00e1c ph\u1ea7n ti\u1ebfp theo, ch\u00fang ta s\u1ebd \u0111i s\u00e2u v\u00e0o nh\u1eefng \u0111i\u1ec3m t\u1ea1o n\u00ean s\u1ef1 kh\u00e1c bi\u1ec7t c\u1ee7a th\u00e9p 4340. T\u1eeb nh\u1eefng \u0111\u1eb7c \u0111i\u1ec3m ri\u00eang bi\u1ec7t \u0111\u1ebfn ph\u1ea1m vi s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i, b\u1ea1n s\u1ebd bi\u1ebft \u0111\u01b0\u1ee3c l\u00fd do t\u1ea1i sao v\u1eadt li\u1ec7u n\u00e0y \u0111\u01b0\u1ee3c c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p tr\u00ean to\u00e0n c\u1ea7u tin d\u00f9ng.&nbsp;&nbsp;<\/p><h2 class=\"wp-block-heading\">Th\u00e9p 4340 l\u00e0 g\u00ec?<\/h2><p>Th\u00e9p 4340 l\u00e0 kim lo\u1ea1i h\u1ee3p kim th\u1ea5p, c\u01b0\u1eddng \u0111\u1ed9 cao \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn v\u1ec1 \u0111\u1ed9 b\u1ec1n, kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ecfi v\u00e0 kh\u1ea3 n\u0103ng ch\u1ecbu m\u00e0i m\u00f2n. \u0110\u00e2y l\u00e0 th\u00e9p cacbon trung b\u00ecnh, th\u01b0\u1eddng ch\u1ee9a 0,40% \u0111\u1ebfn 0,42% cacbon, c\u00f9ng v\u1edbi niken, crom v\u00e0 molypden, mang l\u1ea1i cho n\u00f3 \u0111\u1ed9 b\u1ec1n v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n \u0111\u1eb7c bi\u1ec7t. \u0110i\u1ec1u n\u00e0y l\u00e0m cho n\u00f3 ho\u00e0n h\u1ea3o cho c\u00e1c \u1ee9ng d\u1ee5ng \u0111\u00f2i h\u1ecfi kh\u1eaft khe trong c\u00e1c l\u0129nh v\u1ef1c nh\u01b0 h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5, \u00f4 t\u00f4 v\u00e0 s\u1ea3n xu\u1ea5t thi\u1ebft b\u1ecb h\u1ea1ng n\u1eb7ng.<\/p><p>\u1ede tr\u1ea1ng th\u00e1i \u1ee7, th\u00e9p 4340 d\u1ec5 gia c\u00f4ng v\u00e0 l\u00e0m ngu\u1ed9i, mang l\u1ea1i s\u1ef1 linh ho\u1ea1t trong s\u1ea3n xu\u1ea5t. N\u00f3 c\u0169ng c\u00f3 kh\u1ea3 n\u0103ng h\u00e0n tuy\u1ec7t v\u1eddi, l\u00fd t\u01b0\u1edfng cho c\u00e1c th\u00e0nh ph\u1ea7n h\u00e0n ph\u1ee9c t\u1ea1p. Sau khi t\u00f4i v\u00e0 ram d\u1ea7u, n\u00f3 \u0111\u1ea1t \u0111\u01b0\u1ee3c s\u1ef1 k\u1ebft h\u1ee3p m\u1ea1nh m\u1ebd gi\u1eefa \u0111\u1ed9 b\u1ec1n v\u00e0 \u0111\u1ed9 d\u1ebbo. N\u00f3 c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u00e0m c\u1ee9ng th\u00eam th\u00f4ng qua qu\u00e1 tr\u00ecnh t\u00f4i b\u1eb1ng ng\u1ecdn l\u1eeda ho\u1eb7c c\u1ea3m \u1ee9ng v\u00e0 th\u1ea5m nit\u01a1, t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 b\u1ec1n cho c\u00e1c m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng kh\u1eaft khe.<\/p><h2 class=\"wp-block-heading\">Th\u00e9p 4340 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u00e0m g\u00ec?<\/h2><ul class=\"wp-block-list\"><li><strong>H\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5<\/strong>: Linh ki\u1ec7n m\u00e1y bay qu\u00e2n s\u1ef1, tr\u1ee5c tua bin, thanh gi\u1eb1ng c\u00e1nh<\/li>\n\n<li><strong>\u00d4 t\u00f4<\/strong>: Tr\u1ee5c khu\u1ef7u, tr\u1ee5c b\u00e1nh xe, tr\u1ee5c cam, b\u1ed9 vi sai<strong>S<\/strong><\/li>\n\n<li><strong>H\u00e0ng h\u1ea3i<\/strong>: Tr\u1ee5c ch\u00e2n v\u1ecbt, b\u00e1nh l\u00e1i, b\u00e1nh r\u0103ng t\u1eddi<\/li>\n\n<li><strong>N\u0103ng l\u01b0\u1ee3ng gi\u00f3<\/strong>: V\u00f2ng bi nghi\u00eang v\u00e0 l\u1eafc, v\u00f2ng b\u00e1nh r\u0103ng cho h\u1ed9p s\u1ed1<\/li>\n\n<li><strong>M\u00e1y m\u00f3c h\u1ea1ng n\u1eb7ng<\/strong>: Xi lanh th\u1ee7y l\u1ef1c, b\u00e1nh x\u00edch m\u00e1y \u1ee7i, b\u00e1nh r\u0103ng thi\u1ebft b\u1ecb khai th\u00e1c m\u1ecf<\/li>\n\n<li><strong>D\u1ea7u kh\u00ed<\/strong>: C\u1ed5 khoan, tr\u1ee5c b\u01a1m, th\u00e2n van, thi\u1ebft b\u1ecb \u0111\u1ea7u gi\u1ebfng<\/li><\/ul><h2 class=\"wp-block-heading\">4340 C\u00e1c lo\u1ea1i th\u00e9p t\u01b0\u01a1ng \u0111\u01b0\u01a1ng<\/h2><p>B\u1ea3ng sau \u0111\u00e2y ph\u00e1c th\u1ea3o c\u00e1c c\u1ea5p \u0111\u1ed9 v\u00e0 ti\u00eau chu\u1ea9n t\u01b0\u01a1ng \u0111\u01b0\u01a1ng cho th\u00e9p 4340 tr\u00ean c\u00e1c h\u1ec7 th\u1ed1ng to\u00e0n c\u1ea7u kh\u00e1c nhau. T\u1ea1i SteelPro Group, ch\u00fang t\u00f4i cung c\u1ea5p th\u00e9p 4340 ch\u1ea5t l\u01b0\u1ee3ng cao tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c c\u00f4ng nh\u1eadn n\u00e0y.<\/p><figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Qu\u1ed1c gia\/Khu v\u1ef1c<\/strong><\/td><td><strong>Ti\u00eau chu\u1ea9n<\/strong><\/td><td><strong>C\u1ea5p<\/strong><\/td><\/tr><tr><td>Trung Qu\u1ed1c<\/td><td>Anh<\/td><td>40CrNiMo<\/td><\/tr><tr><td rowspan=\"2\">Hoa K\u1ef3<\/td><td>Ti\u00eau chu\u1ea9n ASTM<\/td><td>4340<\/td><\/tr><tr><td>Li\u00ean Hi\u1ec7p Qu\u1ed1c<\/td><td>G43400<\/td><\/tr><tr><td>Li\u00ean minh ch\u00e2u \u00c2u<\/td><td>VI<\/td><td>34CrNiMo6<\/td><\/tr><tr><td rowspan=\"2\">\u0110\u1ee9c<\/td><td>\u0110\u1ea0I H\u1eccC<\/td><td>1.6582<\/td><\/tr><tr><td>S\u1ed1 W<\/td><td>1.6511<\/td><\/tr><tr><td>Nh\u1eadt B\u1ea3n<\/td><td>Ti\u00eau chu\u1ea9n Nh\u1eadt B\u1ea3n<\/td><td>SNCM447<\/td><\/tr><tr><td>Ph\u00e1p<\/td><td>NF EN\/NF<\/td><td>35NCD6<\/td><\/tr><tr><td>Anh<\/td><td>C\u1eed nh\u00e2n Anh\/B\u1eb1ng C\u1eed nh\u00e2n<\/td><td>817M40<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\">Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc c\u1ee7a th\u00e9p 4340<\/h2><figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Y\u1ebfu t\u1ed1<\/strong><\/td><td><strong>N\u1ed9i dung<\/strong><\/td><\/tr><tr><td>Cacbon (C)<\/td><td>0.38 &#8211; 0.43%<\/td><\/tr><tr><td>Silic (Si)<\/td><td>0.15 &#8211; 0.35%<\/td><\/tr><tr><td>Mangan (Mn)<\/td><td>0.60 &#8211; 0.80%<\/td><\/tr><tr><td>Ph\u1ed1t pho (P)<\/td><td>\u2264 0,035%<\/td><\/tr><tr><td>L\u01b0u hu\u1ef3nh (S)<\/td><td>\u2264 0,04%<\/td><\/tr><tr><td>Crom (Cr)<\/td><td>0.70 &#8211; 0.90%<\/td><\/tr><tr><td>Niken (Ni)<\/td><td>1.62 &#8211; 2.00%<\/td><\/tr><tr><td>\u0110\u1ed3ng (Cu)<\/td><td>\u2264 0,35%<\/td><\/tr><tr><td>Molip\u0111en (Mo)<\/td><td>0.20 &#8211; 0.30%<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\">4340 T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc c\u1ee7a th\u00e9p<\/h2><figure class=\"wp-block-table\"><table><tbody><tr><td><strong>T\u00e0i s\u1ea3n<\/strong><\/td><td><strong>Gi\u00e1 tr\u1ecb (\u0110\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng)<\/strong><\/td><td><strong>Gi\u00e1 tr\u1ecb (Anh)<\/strong><\/td><\/tr><tr><td>S\u1ee9c ch\u1ecbu l\u1ef1c<\/td><td>740 \u2013 1860MPa<\/td><td>107 \u2013 270 ksi<\/td><\/tr><tr><td>\u0110\u1ed9 b\u1ec1n k\u00e9o t\u1ed1i \u0111a<\/td><td>860 \u2013 1980MPa<\/td><td>125 \u2013 287 ksi<\/td><\/tr><tr><td>\u0110\u1ed9 gi\u00e3n d\u00e0i<\/td><td>11 &#8211; 23%<\/td><td>11 &#8211; 23%<\/td><\/tr><tr><td>\u0110\u1ed9 b\u1ec1n g\u00e3y bi\u1ebfn d\u1ea1ng ph\u1eb3ng<\/td><td>53 \u2013 110 MPa\u221am<\/td><td>47 \u2013 100 ksi\u221ain<\/td><\/tr><tr><td>M\u00f4 \u0111un kh\u1ed1i<\/td><td>159 GPa<\/td><td>23100 ksi<\/td><\/tr><tr><td>T\u1ef7 s\u1ed1 Poisson<\/td><td>0.29<\/td><td>0.29<\/td><\/tr><tr><td>Kh\u1ea3 n\u0103ng gia c\u00f4ng<\/td><td>57% (\u0110\u00e3 \u1ee7)<\/td><td>57% (\u0110\u00e3 \u1ee7)<\/td><\/tr><tr><td>M\u00f4 \u0111un c\u1eaft<\/td><td>78,0 GPa<\/td><td>11300 kil\u00f4gam<\/td><\/tr><\/tbody><\/table><\/figure><ul class=\"wp-block-list\"><li><strong>Ghi ch\u00fa v\u1ec1 kh\u1ea3 n\u0103ng gia c\u00f4ng<\/strong>: D\u1eef li\u1ec7u n\u00e0y d\u1ef1a tr\u00ean kh\u1ea3 n\u0103ng gia c\u00f4ng 100% cho th\u00e9p AISI 1212. Sau khi \u1ee7 v\u00e0 k\u00e9o ngu\u1ed9i, kh\u1ea3 n\u0103ng gia c\u00f4ng c\u1ee7a th\u00e9p 4340 \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 \u1edf m\u1ee9c 50%.&nbsp;<\/li><\/ul><h2 class=\"wp-block-heading\">4340 T\u00ednh ch\u1ea5t v\u1eadt l\u00fd c\u1ee7a th\u00e9p<\/h2><figure class=\"wp-block-table\"><table><tbody><tr><td><strong>T\u00e0i s\u1ea3n<\/strong><\/td><td><strong>Gi\u00e1 tr\u1ecb (\u0110\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng)<\/strong><\/td><td><strong>Gi\u00e1 tr\u1ecb (Anh)<\/strong><\/td><\/tr><tr><td>T\u1ec9 tr\u1ecdng<\/td><td>7,85g\/cm\u00b3<\/td><td>0,284 lb\/in\u00b3<\/td><\/tr><tr><td>\u0110i\u1ec3m n\u00f3ng ch\u1ea3y<\/td><td>1425\u00b0C<\/td><td>2597\u00b0F<\/td><\/tr><tr><td>\u0110\u1ed9 d\u1eabn nhi\u1ec7t<\/td><td>46 W\/m\u00b7K<\/td><td>32 BTU\/gi\u1edd\u00b7ft\u00b7\u00b0F<\/td><\/tr><tr><td>Nhi\u1ec7t dung ri\u00eang<\/td><td>460 J\/kg\u00b7K<\/td><td>0,11 BTU\/lb\u00b7\u00b0F<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\">T\u00ednh ch\u1ea5t nhi\u1ec7t c\u1ee7a th\u00e9p 4340<\/h2><figure class=\"wp-block-table\"><table><tbody><tr><td><strong>T\u00ednh ch\u1ea5t nhi\u1ec7t<\/strong><\/td><td><strong>H\u1ec7 m\u00e9t<\/strong><\/td><td><strong>\u0110\u1ebf qu\u1ed1c<\/strong><\/td><td><strong>B\u00ecnh lu\u1eadn<\/strong><\/td><\/tr><tr><td rowspan=\"6\">H\u1ec7 s\u1ed1 gi\u00e3n n\u1edf nhi\u1ec7t (CTE)<\/td><td>12,3 \u00b5m\/m-\u00b0C<br>@20\u00b0C<\/td><td>6,83 \u00b5in\/in-\u00b0F<br>@ 68\u00b0F<\/td><td>L\u00e0m c\u1ee9ng b\u1eb1ng d\u1ea7u, nhi\u1ec7t \u0111\u1ed9 600\u00b0C (1110\u00b0F)<\/td><\/tr><tr><td>12,6 \u00b5m\/m-\u00b0C<br>@ 21-260\u00b0C<\/td><td>7,00 \u00b5in\/in-\u00b0F<br>@ 69,8-500\u00b0F<\/td><td>1.88% Ni, \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a v\u00e0 t\u00f4i luy\u1ec7n<\/td><\/tr><tr><td>12,7 \u00b5m\/m-\u00b0C<br>@20\u00b0C<\/td><td>7,06 \u00b5in\/in-\u00b0F<br>@ 68\u00b0F<\/td><td>L\u00e0m c\u1ee9ng b\u1eb1ng d\u1ea7u, nhi\u1ec7t \u0111\u1ed9 600\u00b0C (1110\u00b0F)<\/td><\/tr><tr><td>13,7 \u00b5m\/m-\u00b0C<br>@ 250\u00b0C<\/td><td>7,61 \u00b5in\/in-\u00b0F<br>@ 482\u00b0F<\/td><td>L\u00e0m c\u1ee9ng b\u1eb1ng d\u1ea7u, nhi\u1ec7t \u0111\u1ed9 600\u00b0C (1110\u00b0F)<\/td><\/tr><tr><td>13,7 \u00b5m\/m-\u00b0C<br>@ 21-540\u00b0C<\/td><td>7,61 \u00b5in\/in-\u00b0F<br>@ 69,8-1000\u00b0F<\/td><td>1.88% Ni, \u0111\u01b0\u1ee3c chu\u1ea9n h\u00f3a v\u00e0 t\u00f4i luy\u1ec7n<\/td><\/tr><tr><td>13,9 \u00b5m\/m-\u00b0C<br>@ 21-540\u00b0C<\/td><td>7,72 \u00b5in\/in-\u00b0F<br>@ 69,8-1000\u00b0F<\/td><td>1.90% Ni, t\u00f4i, ram<\/td><\/tr><tr><td>Nhi\u1ec7t dung ri\u00eang<\/td><td>0,475 J\/g-\u00b0C<\/td><td>0,114 BTU\/lb-\u00b0F<\/td><td>Th\u00e9p ti\u00eau bi\u1ec3u lo\u1ea1i 4000<\/td><\/tr><tr><td>\u0110\u1ed9 d\u1eabn nhi\u1ec7t<\/td><td>44,5 W\/mK<\/td><td>309 BTU-in\/gi\u1edd-ft\u00b2-\u00b0F<\/td><td>&#8211;<\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\">\u01afu \u0111i\u1ec3m v\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a th\u00e9p h\u1ee3p kim 4340<\/h2><figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Thu\u1eadn l\u1ee3i<\/strong><\/td><td><strong>Nh\u01b0\u1ee3c \u0111i\u1ec3m<\/strong><\/td><\/tr><tr><td>Kh\u1ea3 n\u0103ng ch\u1ed1ng va \u0111\u1eadp v\u00e0 s\u1ed1c t\u1ed1t.<\/td><td>Nguy c\u01a1 n\u1ee9t khi d\u1eadp t\u1eaft.<\/td><\/tr><tr><td>Kh\u1ea3 n\u0103ng ch\u1ed1ng m\u00e0i m\u00f2n v\u00e0 ch\u1ecbu m\u00e0i m\u00f2n cao.<\/td><td>Y\u00eau c\u1ea7u x\u1eed l\u00fd ch\u00ednh x\u00e1c v\u00e0 chuy\u00ean bi\u1ec7t.<\/td><\/tr><tr><td>\u0110\u1ed9 b\u1ec1n v\u00e0 \u0111\u1ed9 d\u1ebbo dai cao.<\/td><td>D\u1ec5 b\u1ecb \u0103n m\u00f2n.<\/td><\/tr><tr><td>Kh\u1ea3 n\u0103ng ch\u1ed1ng m\u1ecfi tuy\u1ec7t v\u1eddi.<\/td><td><\/td><\/tr><\/tbody><\/table><\/figure><h2 class=\"wp-block-heading\">Th\u00e9p h\u1ee3p kim 4340 \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t nh\u01b0 th\u1ebf n\u00e0o?<\/h2><ol class=\"wp-block-list\"><li>N\u1ea5u ch\u1ea3y v\u00e0 tinh ch\u1ebf<\/li><\/ol><p>Qu\u00e1 tr\u00ecnh n\u00e0y b\u1eaft \u0111\u1ea7u b\u1eb1ng c\u00e1ch n\u1ea5u ch\u1ea3y s\u1eaft, cacbon v\u00e0 c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim trong l\u00f2 h\u1ed3 quang \u0111i\u1ec7n \u1edf <strong>1.400\u00b0C<\/strong> (<strong>2.550\u00b0F<\/strong>). B\u01b0\u1edbc n\u00e0y t\u1ea1o ra h\u1ee3p kim n\u00f3ng ch\u1ea3y \u0111\u1ed3ng nh\u1ea5t. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p tinh ch\u1ebf, ch\u1eb3ng h\u1ea1n nh\u01b0 kh\u1eed kh\u00ed ch\u00e2n kh\u00f4ng l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 l\u00e0m c\u1ee9ng hi\u1ec7u qu\u1ea3.<\/p><ol start=\"2\" class=\"wp-block-list\"><li>\u0110\u00fac v\u00e0 \u0111\u1ecbnh h\u00ecnh<\/li><\/ol><p>Sau khi th\u00e9p \u0111\u01b0\u1ee3c \u0111\u00fac th\u00e0nh ph\u00f4i ho\u1eb7c th\u1ecfi, n\u00f3 \u0111\u01b0\u1ee3c r\u00e8n \u1edf nhi\u1ec7t \u0111\u1ed9 t\u1eeb <strong>427-1.233\u00b0C<\/strong> (<strong>800-2.250\u00b0F<\/strong>). R\u00e8n t\u1ea1o h\u00ecnh th\u00e9p v\u00e0 tinh ch\u1ec9nh c\u1ea5u tr\u00fac h\u1ea1t b\u00ean trong, t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 b\u1ec1n c\u1ee7a th\u00e9p.&nbsp;<\/p><p>Trong giai \u0111o\u1ea1n n\u00e0y, c\u1ea7n ki\u1ec3m so\u00e1t vi\u1ec7c l\u00e0m m\u00e1t \u0111\u1ec3 tr\u00e1nh n\u1ee9t v\u00e0 n\u00ean l\u00e0m m\u00e1t ch\u1eadm trong c\u00e1t ho\u1eb7c v\u00f4i kh\u00f4.<\/p><ol start=\"3\" class=\"wp-block-list\"><li>X\u1eed l\u00fd nhi\u1ec7t \u2013 L\u00e0m ngu\u1ed9i v\u00e0 ram<\/li><\/ol><p>\u0110\u1ea7u ti\u00ean, th\u00e9p \u0111\u01b0\u1ee3c nung n\u00f3ng \u0111\u1ebfn <strong>830-860\u00b0C<\/strong> (<strong>1.525-1.580\u00b0F<\/strong>) v\u00e0 nhanh ch\u00f3ng l\u00e0m ngu\u1ed9i trong d\u1ea7u. \u0110i\u1ec1u n\u00e0y t\u1ea1o ra m\u1ed9t c\u1ea5u tr\u00fac martensitic. Sau \u0111\u00f3, th\u00e9p \u0111\u01b0\u1ee3c t\u00f4i luy\u1ec7n \u1edf <strong>400-600\u00b0C<\/strong> (<strong>750-1.100\u00b0F<\/strong>) \u0111\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 d\u1ebbo dai trong khi v\u1eabn duy tr\u00ec \u0111\u01b0\u1ee3c \u0111\u1ed9 b\u1ec1n.&nbsp;<\/p><ol start=\"4\" class=\"wp-block-list\"><li>\u1ee6 (T\u00f9y ch\u1ecdn)<\/li><\/ol><p>Th\u00e9p 4340 \u0111\u01b0\u1ee3c nung n\u00f3ng \u0111\u1ebfn <strong>844\u00b0C<\/strong> (<strong>1.550\u00b0F<\/strong>) v\u00e0 l\u00e0m ngu\u1ed9i ch\u1eadm trong l\u00f2. Qu\u00e1 tr\u00ecnh n\u00e0y tinh ch\u1ec9nh c\u1ea5u tr\u00fac c\u1ee7a th\u00e9p, gi\u00fap d\u1ec5 gia c\u00f4ng v\u00e0 \u0111\u1ecbnh h\u00ecnh h\u01a1n trong c\u00e1c giai \u0111o\u1ea1n sau.<\/p><ol start=\"5\" class=\"wp-block-list\"><li>Gia c\u00f4ng cu\u1ed1i c\u00f9ng v\u00e0 ho\u00e0n thi\u1ec7n b\u1ec1 m\u1eb7t<\/li><\/ol><p>Sau khi th\u00e9p \u0111\u00e3 tr\u1ea3i qua qu\u00e1 tr\u00ecnh x\u1eed l\u00fd nhi\u1ec7t v\u00e0 b\u1ea5t k\u1ef3 qu\u00e1 tr\u00ecnh l\u00e0m c\u1ee9ng b\u1ec1 m\u1eb7t c\u1ea7n thi\u1ebft n\u00e0o, n\u00f3 \u0111\u00e3 s\u1eb5n s\u00e0ng cho qu\u00e1 tr\u00ecnh gia c\u00f4ng cu\u1ed1i c\u00f9ng. C\u00e1c quy tr\u00ecnh ch\u00ednh x\u00e1c nh\u01b0 ti\u1ec7n, phay v\u00e0 m\u00e0i \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u00edch th\u01b0\u1edbc v\u00e0 \u0111\u1ed9 ho\u00e0n thi\u1ec7n b\u1ec1 m\u1eb7t c\u1ea7n thi\u1ebft, \u0111\u1ea3m b\u1ea3o r\u1eb1ng th\u00e9p \u0111\u00e1p \u1ee9ng c\u00e1c y\u00eau c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a \u1ee9ng d\u1ee5ng.<\/p><p>T\u1ea1i SteelPro Group, ch\u00fang t\u00f4i t\u1eadp trung v\u00e0o vi\u1ec7c cung c\u1ea5p c\u00e1c thanh, t\u1ea5m v\u00e0 thanh th\u00e9p 4340 ch\u1ea5t l\u01b0\u1ee3ng cao. C\u00e1c chuy\u00ean gia c\u1ee7a ch\u00fang t\u00f4i \u0111\u1ea3m b\u1ea3o r\u1eb1ng m\u1ed7i l\u00f4 h\u00e0ng \u0111\u1ec1u tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n nghi\u00eam ng\u1eb7t.&nbsp;<\/p><h2 class=\"wp-block-heading\">Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt s\u1ea3n ph\u1ea9m th\u00e9p 4340<\/h2><figure class=\"wp-block-table\"><table><tbody><tr><td><strong>Lo\u1ea1i s\u1ea3n ph\u1ea9m<\/strong><\/td><td><strong>\u0110\u01b0\u1eddng k\u00ednh\/\u0110\u1ed9 d\u00e0y<\/strong><\/td><td><strong>Chi\u1ec1u d\u00e0i\/Chi\u1ec1u r\u1ed9ng<\/strong><\/td><\/tr><tr><td>Thanh<\/td><td>\u0110\u01b0\u1eddng k\u00ednh t\u1eeb 0,5\u2033 \u0111\u1ebfn 12\u2033 (12,7 mm \u0111\u1ebfn 304,8 mm)<\/td><td>Chi\u1ec1u d\u00e0i l\u00ean \u0111\u1ebfn 20\u2032 (6,1 m)<\/td><\/tr><tr><td>V\u00f2ng tr\u00f2n<\/td><td>\u0110\u01b0\u1eddng k\u00ednh t\u1eeb 0,5\u2033 \u0111\u1ebfn 12\u2033 (12,7 mm \u0111\u1ebfn 304,8 mm)<\/td><td>Chi\u1ec1u d\u00e0i l\u00ean \u0111\u1ebfn 20\u2032 (6,1 m)<\/td><\/tr><tr><td>\u0110\u0129a<\/td><td>\u0110\u1ed9 d\u00e0y t\u1eeb 0,5\u2033 \u0111\u1ebfn 6\u2033 (12,7 mm \u0111\u1ebfn 152,4 mm)<\/td><td>Chi\u1ec1u r\u1ed9ng l\u00ean \u0111\u1ebfn 120\u2033 (3,05 m)<\/td><\/tr><tr><td>T\u1ea5m tr\u1ea3i gi\u01b0\u1eddng<\/td><td>\u0110\u1ed9 d\u00e0y t\u1eeb 0,5\u2033 \u0111\u1ebfn 2\u2033 (12,7 mm \u0111\u1ebfn 50,8 mm)<\/td><td>Chi\u1ec1u r\u1ed9ng l\u00ean \u0111\u1ebfn 120\u2033 (3,05 m)<\/td><\/tr><tr><td>Thanh<\/td><td>\u0110\u01b0\u1eddng k\u00ednh t\u1eeb 0,5\u2033 \u0111\u1ebfn 6\u2033 (12,7 mm \u0111\u1ebfn 152,4 mm)<\/td><td>Chi\u1ec1u d\u00e0i l\u00ean \u0111\u1ebfn 20\u2032 (6,1 m)<\/td><\/tr><tr><td>V\u00f2ng (Gia c\u00f4ng)<\/td><td>\u0110\u01b0\u1eddng k\u00ednh t\u1eeb 0,5\u2033 \u0111\u1ebfn 10\u2033 (12,7 mm \u0111\u1ebfn 254 mm)<\/td><td>Chi\u1ec1u d\u00e0i l\u00ean \u0111\u1ebfn 20\u2032 (6,1 m)<\/td><\/tr><tr><td>Thanh (k\u00e9o ngu\u1ed9i)<\/td><td>\u0110\u01b0\u1eddng k\u00ednh t\u1eeb 0,5\u2033 \u0111\u1ebfn 6\u2033 (12,7 mm \u0111\u1ebfn 152,4 mm)<\/td><td>Chi\u1ec1u d\u00e0i l\u00ean \u0111\u1ebfn 20\u2032 (6,1 m)<\/td><\/tr><\/tbody><\/table><\/figure><p>Ch\u00fang t\u00f4i cung c\u1ea5p k\u00edch th\u01b0\u1edbc t\u00f9y ch\u1ec9nh cho th\u00e9p h\u1ee3p kim 4340 \u0111\u1ec3 \u0111\u00e1p \u1ee9ng nhu c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a b\u1ea1n. Cho d\u00f9 b\u1ea1n y\u00eau c\u1ea7u th\u00e9p c\u00e1n n\u00f3ng, \u1ee7 ho\u1eb7c k\u00e9o ngu\u1ed9i, ch\u00fang t\u00f4i c\u00f3 th\u1ec3 cung c\u1ea5p h\u00ecnh d\u1ea1ng ph\u00f9 h\u1ee3p nh\u1ea5t v\u1edbi \u1ee9ng d\u1ee5ng c\u1ee7a b\u1ea1n.<\/p><ul class=\"wp-block-list\"><li><strong>c\u00e1n n\u00f3ng<\/strong>:Th\u00e9p \u0111\u01b0\u1ee3c x\u1eed l\u00fd \u1edf nhi\u1ec7t \u0111\u1ed9 cao \u0111\u1ec3 t\u0103ng \u0111\u1ed9 d\u1ebbo dai v\u00e0 \u0111\u1ed9 b\u1ec1n, l\u00fd t\u01b0\u1edfng cho c\u00e1c th\u00e0nh ph\u1ea7n l\u1edbn, ch\u1ecbu \u1ee9ng su\u1ea5t cao.<\/li>\n\n<li><strong>\u1ee6<\/strong>:Th\u00e9p \u0111\u01b0\u1ee3c nung n\u00f3ng v\u00e0 l\u00e0m ngu\u1ed9i t\u1eeb t\u1eeb \u0111\u1ec3 tinh ch\u1ec9nh c\u1ea5u tr\u00fac, gi\u00fap d\u1ec5 gia c\u00f4ng v\u00e0 \u0111\u1ecbnh h\u00ecnh h\u01a1n.<\/li>\n\n<li><strong>V\u1ebd ngu\u1ed9i<\/strong>:Th\u00e9p \u0111\u01b0\u1ee3c k\u00e9o qua khu\u00f4n \u1edf nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng, t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 b\u1ec1n, \u0111\u1ed9 ch\u00ednh x\u00e1c v\u00e0 ch\u1ea5t l\u01b0\u1ee3ng b\u1ec1 m\u1eb7t.<\/li><\/ul><h2 class=\"wp-block-heading\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p v\u1ec1 th\u00e9p h\u1ee3p kim 4340<\/h2><h3 class=\"wp-block-heading\">Th\u00e9p 4340 c\u00f3 ph\u1ea3i l\u00e0 th\u00e9p kh\u00f4ng g\u1ec9 kh\u00f4ng?<\/h3><p>Kh\u00f4ng, th\u00e9p 4340 kh\u00f4ng ph\u1ea3i l\u00e0 th\u00e9p kh\u00f4ng g\u1ec9. N\u00f3 kh\u00f4ng ch\u1ee9a h\u00e0m l\u01b0\u1ee3ng crom cao ho\u1eb7c c\u00e1c nguy\u00ean t\u1ed1 kh\u00e1c gi\u00fap n\u00f3 ch\u1ed1ng \u0103n m\u00f2n nh\u01b0 th\u00e9p kh\u00f4ng g\u1ec9.<\/p><h3 class=\"wp-block-heading\">S\u1ef1 kh\u00e1c bi\u1ec7t gi\u1eefa th\u00e9p 4340 v\u00e0 4140 l\u00e0 g\u00ec?<\/h3><p>Th\u00e9p 4340 ch\u1ee9a h\u00e0m l\u01b0\u1ee3ng niken, crom v\u00e0 molypden cao h\u01a1n, khi\u1ebfn n\u00f3 b\u1ec1n h\u01a1n v\u00e0 d\u1ec5 u\u1ed1n h\u01a1n <a href=\"https:\/\/steelprogroup.com\/vi\/steel-bar\/4140\/\">th\u00e9p 4140<\/a>.<\/p><p>Th\u00e9p 4340 l\u00fd t\u01b0\u1edfng cho c\u00e1c \u1ee9ng d\u1ee5ng ch\u1ecbu \u1ee9ng su\u1ea5t cao, ch\u1ecbu t\u1ea3i n\u1eb7ng, ch\u1eb3ng h\u1ea1n nh\u01b0 trong c\u00e1c th\u00e0nh ph\u1ea7n h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5, \u00f4 t\u00f4 v\u00e0 qu\u00e2n s\u1ef1. Ng\u01b0\u1ee3c l\u1ea1i, th\u00e9p 4140, v\u1edbi h\u00e0m l\u01b0\u1ee3ng h\u1ee3p kim th\u1ea5p h\u01a1n, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c b\u1ed9 ph\u1eadn \u0111\u00f2i h\u1ecfi \u0111\u1ed9 b\u1ec1n v\u1eeba ph\u1ea3i, ch\u1eb3ng h\u1ea1n nh\u01b0 tr\u1ee5c, b\u00e1nh r\u0103ng v\u00e0 bu l\u00f4ng.<\/p><h2 class=\"wp-block-heading\">Kh\u00e1m ph\u00e1 s\u1ee9c m\u1ea1nh c\u1ee7a th\u00e9p h\u1ee3p kim 4340 cho d\u1ef1 \u00e1n ti\u1ebfp theo c\u1ee7a b\u1ea1n<\/h2><p>SteelPro Group chuy\u00ean cung c\u1ea5p c\u00e1c gi\u1ea3i ph\u00e1p th\u00e9p 4340 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf ri\u00eang \u0111\u00e1p \u1ee9ng nhu c\u1ea7u ri\u00eang bi\u1ec7t c\u1ee7a ng\u00e0nh c\u00f4ng nghi\u1ec7p c\u1ee7a b\u1ea1n. Cho d\u00f9 b\u1ea1n \u0111ang t\u00ecm ki\u1ebfm l\u1eddi khuy\u00ean c\u1ee7a chuy\u00ean gia, khuy\u1ebfn ngh\u1ecb s\u1ea3n ph\u1ea9m ch\u00ednh x\u00e1c hay quy tr\u00ecnh \u0111\u1eb7t h\u00e0ng li\u1ec1n m\u1ea1ch, nh\u00f3m c\u1ee7a ch\u00fang t\u00f4i lu\u00f4n s\u1eb5n s\u00e0ng tr\u1ee3 gi\u00fap. H\u00e3y li\u00ean h\u1ec7 ngay h\u00f4m nay \u0111\u1ec3 kh\u00e1m ph\u00e1 c\u00e1ch th\u00e9p h\u1ee3p kim 4340 c\u00f3 th\u1ec3 n\u00e2ng cao hi\u1ec7u su\u1ea5t d\u1ef1 \u00e1n c\u1ee7a b\u1ea1n v\u00e0 th\u00fac \u0111\u1ea9y th\u00e0nh c\u00f4ng c\u1ee7a b\u1ea1n.<\/p><p><\/p>","protected":false},"excerpt":{"rendered":"<p>4340 alloy steel is known for its versatility and strength, making it an ideal choice for high-performance components like gears [&hellip;]<\/p>","protected":false},"author":12,"featured_media":21201,"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":[4308],"tags":[],"class_list":["post-21213","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-alloy-steel"],"acf":[],"_links":{"self":[{"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/posts\/21213","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=21213"}],"version-history":[{"count":0,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/posts\/21213\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/media\/21201"}],"wp:attachment":[{"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/media?parent=21213"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/categories?post=21213"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/tags?post=21213"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}