{"id":18368,"date":"2019-12-14T02:17:37","date_gmt":"2019-12-14T02:17:37","guid":{"rendered":"https:\/\/www.meetyoucarbide.com\/?p=13865"},"modified":"2020-05-07T01:11:17","modified_gmt":"2020-05-07T01:11:17","slug":"what-is-low-alloy-structural-steel","status":"publish","type":"post","link":"https:\/\/www.meetyoucarbide.com\/vi\/thep-hop-kim-thap-la-gi\/","title":{"rendered":"Th\u00e9p k\u1ebft c\u1ea5u h\u1ee3p kim th\u1ea5p l\u00e0 g\u00ec"},"content":{"rendered":"
\n

Th\u00e9p k\u1ebft c\u1ea5u h\u1ee3p kim th\u1ea5p d\u00f9ng \u0111\u1ec3 ch\u1ec9 th\u00e9p k\u1ebft c\u1ea5u h\u1ee3p kim c\u00f3 t\u1ed5ng th\u00e0nh ph\u1ea7n h\u1ee3p kim nh\u1ecf h\u01a1n 5%. H\u00e0m l\u01b0\u1ee3ng carbon c\u1ee7a lo\u1ea1i th\u00e9p n\u00e0y t\u01b0\u01a1ng t\u1ef1 nh\u01b0 th\u00e9p carbon th\u1ea5p, v\u00e0 n\u00f3 ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c t\u0103ng c\u01b0\u1eddng b\u1edfi m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim \u0111\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 d\u1ebbo dai v\u00e0 kh\u1ea3 n\u0103ng h\u00e0n. S\u1ee9c m\u1ea1nh c\u1ee7a n\u00f3 cao h\u01a1n nhi\u1ec1u so v\u1edbi c\u00f9ng lo\u1ea1i th\u00e9p carbon. \u0110\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c b\u00ecnh ch\u1ecbu \u00e1p l\u1ef1c, thi\u1ebft b\u1ecb h\u00f3a h\u1ecdc, n\u1ed3i h\u01a1i, c\u1ea7u, xe c\u1ed9, t\u00e0u v\u00e0 c\u00e1c k\u1ebft c\u1ea5u th\u00e9p l\u1edbn. C\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim nh\u01b0 mangan, silicon v\u00e0 molypden l\u00e0m t\u0103ng c\u01b0\u1eddng dung d\u1ecbch. Vanadi v\u00e0 niobi c\u00f3 th\u1ec3 tinh ch\u1ebf ng\u0169 c\u1ed1c v\u00e0 c\u1ea3i thi\u1ec7n \u0111\u1ed9 d\u1ebbo dai. Molypden c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u1ed9 c\u1ee9ng, c\u1ea5u tr\u00fac bainite v\u00e0 \u0111\u1ed9 b\u1ec1n nhi\u1ec7t.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Th\u01b0\u01a1ng hi\u1ec7u v\u00e0 \u0111\u1ea1i di\u1ec7n c\u1ee7a n\u00f3<\/h2>\n\n\n\n

C\u00e1c lo\u1ea1i th\u00e9p k\u1ebft c\u1ea5u h\u1ee3p kim th\u1ea5p v\u00e0 bi\u1ec3u hi\u1ec7n c\u1ee7a ch\u00fang: c\u00f3 n\u0103m lo\u1ea1i th\u00e9p k\u1ebft c\u1ea5u h\u1ee3p kim th\u1ea5p \u1edf Trung Qu\u1ed1c, v\u00e0 c\u00e1c y\u1ebfu t\u1ed1 ch\u00ednh l\u00e0 mangan, silicon, vanadi, titan, s\u1eafc, cr\u00f4m, niken v\u00e0 c\u00e1c nguy\u00ean t\u1ed1 \u0111\u1ea5t hi\u1ebfm. Nh\u00e3n hi\u1ec7u c\u1ee7a n\u00f3 bao g\u1ed3m ch\u1eef c\u00e1i n\u0103ng su\u1ea5t Q, gi\u00e1 tr\u1ecb \u0111i\u1ec3m n\u0103ng su\u1ea5t v\u00e0 lo\u1ea1i ch\u1ea5t l\u01b0\u1ee3ng (H\u1ea1ng A, B, C, D, e). N\u00f3 \u0111\u01b0\u1ee3c chia th\u00e0nh n\u0103m l\u1edbp, \u0111\u01b0\u1ee3c th\u1ec3 hi\u1ec7n nh\u01b0 sau: \u0111i\u1ec3m n\u0103ng su\u1ea5t - l\u1edbp ch\u1ea5t l\u01b0\u1ee3ng. \u0110i\u1ec3m n\u0103ng su\u1ea5t: q295, Q345, Q390, Q420, Q460.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

y\u00eau c\u1ea7u th\u1ef1c hi\u1ec7n<\/h2>\n\n\n\n

1. T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc to\u00e0n di\u1ec7n t\u1ed1t. Th\u00e9p k\u1ebft c\u1ea5u h\u1ee3p kim th\u1ea5p th\u00f4ng th\u01b0\u1eddng n\u00ean c\u00f3 gi\u1edbi h\u1ea1n n\u0103ng su\u1ea5t cao l\u00fac \u0111\u1ea7u, nh\u01b0ng do s\u1ef1 ph\u1ee9c t\u1ea1p c\u1ee7a \u0111i\u1ec1u ki\u1ec7n l\u00e0m vi\u1ec7c c\u1ee7a n\u00f3, n\u00f3 c\u0169ng ph\u1ea3i c\u00f3 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc to\u00e0n di\u1ec7n t\u1ed1t. V\u00ed d\u1ee5, n\u00f3 c\u00f3 th\u1ec3 ch\u1ecbu t\u00e1c \u0111\u1ed9ng c\u1ee7a c\u00e1c \u1ee9ng su\u1ea5t kh\u00e1c nhau khi s\u1eed d\u1ee5ng (nh\u01b0 \u1ee9ng su\u1ea5t ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9, \u1ee9ng su\u1ea5t sinh ra do t\u1ea3i tr\u1ecdng m\u1ecfi xen k\u1ebd, v.v.) v\u00e0 c\u00f3 th\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c c\u00e1c quy tr\u00ecnh x\u1eed l\u00fd nh\u01b0 c\u1eaft, u\u1ed1n l\u1ea1nh, h\u00e0n, v.v. qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t, c\u0169ng nh\u01b0 \u0111\u1ed9 gi\u00f2n gi\u00e0 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t t\u1eeb \u0111\u00f3.<\/p>\n\n\n\n

2. Hi\u1ec7u su\u1ea5t qu\u00e1 tr\u00ecnh t\u1ed1t. Y\u00eau c\u1ea7u th\u00e9p h\u1ee3p kim th\u1ea5p th\u00f4ng th\u01b0\u1eddng ph\u1ea3i c\u00f3 hi\u1ec7u su\u1ea5t x\u1eed l\u00fd v\u00e0 t\u1ea1o h\u00ecnh t\u1ed1t, v\u00e0 s\u1eed d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p ph\u1ed5 bi\u1ebfn nh\u01b0 c\u1eaft, d\u1eadp, u\u1ed1n n\u00f3ng v\u00e0 h\u00e0n \u0111\u1ec3 s\u1ea3n xu\u1ea5t th\u00e0nh ph\u1ea9m c\u00f3 ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t. \u0110\u1ed1i v\u1edbi n\u1ed3i h\u01a1i, b\u00ecnh ch\u1ecbu \u00e1p l\u1ef1c, k\u1ebft c\u1ea5u th\u00e9p, v.v., ph\u01b0\u01a1ng ph\u00e1p h\u00e0n th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng, do \u0111\u00f3, th\u00e9p ph\u1ea3i c\u00f3 hi\u1ec7u su\u1ea5t c\u1eaft ng\u1ecdn l\u1eeda v\u00e0 hi\u1ec7u su\u1ea5t h\u00e0n t\u1ed1t, s\u1ef1 thay \u0111\u1ed5i hi\u1ec7u su\u1ea5t c\u1ee7a v\u00f9ng ch\u1ecbu \u1ea3nh h\u01b0\u1edfng nhi\u1ec7t g\u1ea7n kh\u1edbp h\u00e0n l\u00e0 nh\u1ecf, m\u1ed1i h\u00e0n v\u00e0 khu v\u1ef1c li\u1ec1n k\u1ec1 kh\u00f4ng \u0111\u01b0\u1ee3c t\u1ea1o ra c\u00e1c v\u1ebft n\u1ee9t, v\u00e0 hi\u1ec7u su\u1ea5t c\u01a1 h\u1ecdc to\u00e0n di\u1ec7n c\u1ee7a m\u1ed1i h\u00e0n kh\u00f4ng \u0111\u01b0\u1ee3c nh\u1ecf h\u01a1n (ho\u1eb7c hi\u1ebfm khi nh\u1ecf h\u01a1n) kim lo\u1ea1i c\u01a1 b\u1ea3n. Ngo\u00e0i ra, th\u00e9p \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u ph\u1ea3i c\u00f3 hi\u1ec7u su\u1ea5t d\u1eadp ngu\u1ed9i t\u1ed1t.<\/p>\n\n\n\n

3. Ch\u1ed1ng \u0103n m\u00f2n t\u1ed1t. B\u1edfi v\u00ec th\u00e9p h\u1ee3p kim th\u1ea5p th\u00f4ng th\u01b0\u1eddng v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a n\u00f3 cao h\u01a1n nhi\u1ec1u so v\u1edbi th\u00e9p carbon, v\u00e0 \u0111\u1ed9 d\u00e0y th\u00e0nh c\u1ee7a b\u00ecnh ch\u1ecbu \u00e1p l\u1ef1c v\u00e0 k\u1ebft c\u1ea5u th\u00e9p l\u00e0m t\u1eeb n\u00f3 nh\u1ecf h\u01a1n nhi\u1ec1u so v\u1edbi th\u00e9p carbon, t\u1ef7 l\u1ec7 t\u1ed5n th\u1ea5t do \u0103n m\u00f2n kh\u00ed quy\u1ec3n (\u0111\u1eb7c bi\u1ec7t l\u00e0 \u0103n m\u00f2n kh\u00ed quy\u1ec3n bi\u1ec3n) ph\u1ea3i \u0111\u01b0\u1ee3c t\u0103ng l\u00ean t\u01b0\u01a1ng \u1ee9ng, \u0111\u1ec3 n\u00f3 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n t\u1ed1t trong c\u00e1c \u0111i\u1ec1u ki\u1ec7n kh\u00ed quy\u1ec3n kh\u00e1c nhau .. Do \u0111\u00f3, vi\u1ec7c ki\u1ec3m tra kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n c\u1ee7a th\u00e9p kh\u00f4ng ch\u1ec9 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n trong ph\u00f2ng th\u00ed nghi\u1ec7m, m\u00e0 c\u1ea3 trong l\u0129nh v\u1ef1c n\u00e0y. T\u1ea5t nhi\u00ean, c\u1ea7n ph\u1ea3i \u00e1p d\u1ee5ng c\u00f4ng ngh\u1ec7 ch\u1ed1ng \u0103n m\u00f2n b\u00ean ngo\u00e0i th\u00edch h\u1ee3p cho th\u00e9p carbon, th\u00e9p h\u1ee3p kim th\u1ea5p v\u00e0 c\u00e1c v\u1eadt li\u1ec7u kh\u00e1c.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Vai tr\u00f2 c\u1ee7a c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim<\/h2>\n\n\n\n

Th\u00e9p h\u1ee3p kim th\u1ea5p ph\u1ed5 bi\u1ebfn \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong b\u00ecnh ch\u1ecbu \u00e1p l\u1ef1c ch\u1ee7 y\u1ebfu l\u00e0 c\u1ea5u tr\u00fac ng\u1ecdc trai ferrite. C\u00e1c t\u00ednh ch\u1ea5t cu\u1ed1i c\u00f9ng thu \u0111\u01b0\u1ee3c b\u1eb1ng c\u00e1ch c\u00e1n n\u00f3ng ho\u1eb7c chu\u1ea9n h\u00f3a, v\u00e0 c\u1ea5u tr\u00fac c\u1ee7a n\u00f3 \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn b\u1edfi c\u1ea5u tr\u00fac c\u00e2n b\u1eb1ng c\u1ee7a th\u00e9p. Nguy\u00ean t\u1ed1 h\u1ee3p kim ch\u00ednh trong th\u00e9p l\u00e0 carbon. T\u0103ng h\u00e0m l\u01b0\u1ee3ng carbon c\u00f3 th\u1ec3 l\u00e0m t\u0103ng s\u1ed1 l\u01b0\u1ee3ng ng\u1ecdc trai v\u00e0 t\u0103ng gi\u1edbi h\u1ea1n n\u0103ng su\u1ea5t v\u00e0 gi\u1edbi h\u1ea1n c\u01b0\u1eddng \u0111\u1ed9. Tuy nhi\u00ean, c\u00f3 m\u1ed9t gi\u1edbi h\u1ea1n nh\u1ea5t \u0111\u1ecbnh \u0111\u1ec3 t\u0103ng h\u00e0m l\u01b0\u1ee3ng carbon, b\u1edfi v\u00ec vi\u1ec7c t\u0103ng h\u00e0m l\u01b0\u1ee3ng carbon s\u1ebd \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t h\u00e0n v\u00e0 c\u00e1c t\u00ednh ch\u1ea5t kh\u00e1c c\u1ee7a th\u00e9p (nh\u01b0 hi\u1ec7u su\u1ea5t d\u1eadp, v.v.), do \u0111\u00f3 nhi\u1ec7t \u0111\u1ed9 chuy\u1ec3n ti\u1ebfp gi\u00f2n t\u0103ng v\u00e0 \u0111\u1ed9 gi\u00f2n l\u1ea1nh chi\u1ec1u h\u01b0\u1edbng kh\u00f4ng t\u1ed1t. Do \u0111\u00f3, h\u00e0m l\u01b0\u1ee3ng carbon c\u1ee7a th\u00e9p k\u1ebft c\u1ea5u h\u1ee3p kim th\u1ea5p cho b\u00ecnh ch\u1ecbu \u00e1p l\u1ef1c th\u01b0\u1eddng b\u1ecb gi\u1edbi h\u1ea1n \u1edf m\u1ee9c d\u01b0\u1edbi 0,0%. Khi h\u00e0m l\u01b0\u1ee3ng carbon b\u1ecb h\u1ea1n ch\u1ebf, vi\u1ec7c t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a lo\u1ea1i th\u00e9p n\u00e0y ch\u1ee7 y\u1ebfu ph\u1ee5 thu\u1ed9c v\u00e0o vi\u1ec7c b\u1ed5 sung m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim kh\u00e1c nhau (t\u1ed5ng c\u1ed9ng l\u00e0 \u00edt h\u01a1n 5%, th\u01b0\u1eddng l\u00e0 d\u01b0\u1edbi 3%, ch\u1ee7 y\u1ebfu l\u00e0 1% - 2%). \u0110\u1ed1i v\u1edbi th\u00e9p k\u1ebft c\u1ea5u h\u1ee3p kim th\u1ea5p c\u00f3 c\u1ea5u tr\u00fac ng\u1ecdc trai ferrite, t\u00e1c \u0111\u1ed9ng c\u1ee7a vi\u1ec7c th\u00eam c\u00e1c y\u1ebfu t\u1ed1 h\u1ee3p kim l\u00ean c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a n\u00f3 nh\u01b0 sau: <\/p>\n\n\n\n

C\u00f9ng m\u1ed9t gi\u1ea3i ph\u00e1p t\u0103ng c\u01b0\u1eddng ferrite; <\/p>\n\n\n\n

T\u0103ng l\u01b0\u1ee3ng ng\u1ecdc trai t\u01b0\u01a1ng \u0111\u1ed1i;<\/p>\n\n\n\n

Ki\u1ec3m so\u00e1t k\u00edch th\u01b0\u1edbc h\u1ea1t; <\/p>\n\n\n\n

\u1ea2nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ef1 ph\u00e2n t\u00e1n c\u1ee7a ng\u1ecdc trai;<\/p>\n\n\n\n

K\u1ebft t\u1ee7a c\u1ee9ng l\u1ea1i.<\/p>\n\n\n\n

Mangan v\u00e0 silicon \u0111\u1ec1u h\u00f2a tan r\u1eafn trong ferrite, c\u00f3 t\u00e1c d\u1ee5ng t\u0103ng c\u01b0\u1eddng dung d\u1ecbch \u0111\u00e1ng k\u1ec3. C\u00e1c y\u1ebfu t\u1ed1 kh\u00e1c bao g\u1ed3m cr\u00f4m, niken, \u0111\u1ed3ng, coban, v.v ... Xem x\u00e9t c\u00e1c \u0111i\u1ec1u ki\u1ec7n ti\u1ebft ki\u1ec7m chi ph\u00ed v\u00e0 ti\u1ebft ki\u1ec7m t\u00e0i nguy\u00ean, mangan v\u00e0 silicon l\u00e0 c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong th\u00e9p h\u1ee3p kim th\u1ea5p \u1edf Trung Qu\u1ed1c. Trong \u0111i\u1ec1u ki\u1ec7n carbon th\u1ea5p, khi h\u00e0m l\u01b0\u1ee3ng mangan nh\u1ecf h\u01a1n 1,8%, kh\u00f4ng ch\u1ec9 \u0111\u1ed9 b\u1ec1n c\u1ee7a th\u00e9p c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n m\u00e0 c\u00f2n c\u00f3 th\u1ec3 duy tr\u00ec \u0111\u1ed9 d\u1ebbo v\u00e0 \u0111\u1ed9 d\u1ebbo. Ngo\u00e0i ra, mangan c\u00f3 th\u1ec3 ph\u00f3ng to v\u00f9ng austenite v\u00e0 l\u00e0m cho \u0111i\u1ec3m eutectoid c\u1ee7a th\u00e9p di chuy\u1ec3n sang tr\u00e1i v\u00e0 xu\u1ed1ng, do \u0111\u00f3 n\u00f3 c\u00f3 c\u1ea5u tr\u00fac ng\u1ecdc trai h\u01a1n v\u1edbi c\u1ea5u tr\u00fac m\u1ecbn h\u01a1n v\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a th\u00e9p \u0111\u01b0\u1ee3c t\u0103ng theo.<\/p>\n\n\n\n

H\u00e0m l\u01b0\u1ee3ng silic trong th\u00e9p k\u1ebft c\u1ea5u h\u1ee3p kim th\u1ea5p th\u01b0\u1eddng n\u1eb1m trong kho\u1ea3ng 0,2% - 1,7%, s\u1ebd l\u00e0m gi\u1ea3m \u0111\u1ed9 d\u1ebbo dai. Crom v\u00e0 niken c\u0169ng l\u00e0 c\u00e1c y\u1ebfu t\u1ed1 t\u0103ng c\u01b0\u1eddng dung d\u1ecbch r\u1eafn c\u1ee7a ferrite v\u00e0 niken c\u00f3 t\u00e1c d\u1ee5ng t\u1ed1t trong vi\u1ec7c c\u1ea3i thi\u1ec7n \u0111\u1ed9 b\u1ec1n nhi\u1ec7t \u0111\u1ed9 th\u1ea5p; Ferrite t\u0103ng c\u01b0\u1eddng ph\u1ed1t pho c\u00f3 t\u00e1c d\u1ee5ng \u0111\u00e1ng k\u1ec3, nh\u01b0ng do s\u1ef1 gia t\u0103ng \u0111\u1ed9 gi\u00f2n l\u1ea1nh, h\u00e0m l\u01b0\u1ee3ng t\u1ed1i \u0111a n\u00ean \u0111\u01b0\u1ee3c gi\u1edbi h\u1ea1n \u1edf m\u1ee9c 0,15%, v\u00e0 t\u1ed5ng h\u00e0m l\u01b0\u1ee3ng ph\u1ed1t pho v\u00e0 carbon n\u00ean \u0111\u01b0\u1ee3c gi\u1edbi h\u1ea1n \u1edf m\u1ee9c d\u01b0\u1edbi 0,25%.<\/p>\n\n\n\n

\u1ee9ng d\u1ee5ng<\/h2>\n\n\n\n

Theo ti\u00eau chu\u1ea9n qu\u1ed1c gia (th\u00e9p k\u1ebft c\u1ea5u c\u01b0\u1eddng \u0111\u1ed9 cao h\u1ee3p kim th\u1ea5p) (GB 1591), th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc v\u00e0 t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc c\u1ee7a t\u1eebng lo\u1ea1i th\u00e9p k\u1ebft c\u1ea5u c\u01b0\u1eddng \u0111\u1ed9 cao h\u1ee3p kim th\u1ea5p \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh. Do t\u00e1c d\u1ee5ng t\u0103ng c\u01b0\u1eddng c\u1ee7a c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim, th\u00e9p k\u1ebft c\u1ea5u h\u1ee3p kim th\u1ea5p kh\u00f4ng ch\u1ec9 c\u00f3 c\u01b0\u1eddng \u0111\u1ed9 cao h\u01a1n m\u00e0 c\u00f2n c\u00f3 \u0111\u1ed9 d\u1ebbo, \u0111\u1ed9 b\u1ec1n v\u00e0 kh\u1ea3 n\u0103ng h\u00e0n t\u1ed1t h\u01a1n. Th\u00e9p Q345 c\u00f3 hi\u1ec7u su\u1ea5t to\u00e0n di\u1ec7n t\u1ed1t v\u00e0 l\u00e0 m\u1ed9t th\u01b0\u01a1ng hi\u1ec7u ph\u1ed5 bi\u1ebfn c\u1ee7a k\u1ebft c\u1ea5u th\u00e9p. L\u1edbp Q390 c\u0169ng l\u00e0 m\u1ed9t th\u01b0\u01a1ng hi\u1ec7u \u0111\u01b0\u1ee3c \u0111\u1ec1 xu\u1ea5t. So v\u1edbi th\u00e9p k\u1ebft c\u1ea5u carbon Q235, th\u00e9p k\u1ebft c\u1ea5u c\u01b0\u1eddng \u0111\u1ed9 cao h\u1ee3p kim th\u1ea5p c\u00f3 th\u1ec3 ti\u1ebft ki\u1ec7m th\u00e9p 20% ~ 30%, v\u00e0 c\u00f3 t\u1ea3i tr\u1ecdng \u0111\u1ed9ng t\u1ed1t v\u00e0 ch\u1ed1ng m\u1ecfi. Th\u00e9p k\u1ebft c\u1ea5u h\u1ee3p kim th\u1ea5p ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 c\u00e1n c\u00e1c ph\u1ea7n kh\u00e1c nhau, th\u00e9p t\u1ea5m, \u1ed1ng th\u00e9p v\u00e0 thanh th\u00e9p. N\u00f3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c k\u1ebft c\u1ea5u th\u00e9p v\u00e0 k\u1ebft c\u1ea5u b\u00ea t\u00f4ng c\u1ed1t th\u00e9p, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong c\u00e1c k\u1ebft c\u1ea5u h\u1ea1ng n\u1eb7ng kh\u00e1c nhau, k\u1ebft c\u1ea5u nh\u1ecbp d\u00e0i, k\u1ebft c\u1ea5u nh\u00e0 cao t\u1ea7ng v\u00e0 c\u00e1c d\u1ef1 \u00e1n c\u1ea7u, c\u00e1c k\u1ebft c\u1ea5u ch\u1ecbu t\u1ea3i tr\u1ecdng \u0111\u1ed9ng v\u00e0 t\u00e1c \u0111\u1ed9ng, v.v.<\/p>\n\n\n\n

Th\u00e9p k\u1ebft c\u1ea5u h\u1ee3p kim th\u1ea5p l\u00e0 m\u1ed9t lo\u1ea1i th\u00e9p k\u1ebft c\u1ea5u carbon th\u1ea5p. H\u00e0m l\u01b0\u1ee3ng c\u1ee7a c\u00e1c nguy\u00ean t\u1ed1 h\u1ee3p kim nh\u1ecf h\u01a1n 3%, ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 tinh ch\u1ebf h\u1ea1t v\u00e0 c\u1ea3i thi\u1ec7n s\u1ee9c m\u1ea1nh. \u0110\u1ed9 b\u1ec1n c\u1ee7a lo\u1ea1i th\u00e9p n\u00e0y cao h\u01a1n \u0111\u00e1ng k\u1ec3 so v\u1edbi th\u00e9p carbon c\u00f3 c\u00f9ng h\u00e0m l\u01b0\u1ee3ng carbon, v\u00ec v\u1eady n\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 th\u00e9p c\u01b0\u1eddng \u0111\u1ed9 cao h\u1ee3p kim th\u1ea5p. N\u00f3 c\u0169ng c\u00f3 \u0111\u1ed9 d\u1ebbo dai, \u0111\u1ed9 d\u1ebbo, kh\u1ea3 n\u0103ng h\u00e0n v\u00e0 ch\u1ed1ng \u0103n m\u00f2n. Ban \u0111\u1ea7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u1ea7u, xe, t\u00e0u v\u00e0 c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p kh\u00e1c, ph\u1ea1m vi \u1ee9ng d\u1ee5ng c\u1ee7a n\u00f3 \u0111\u00e3 \u0111\u01b0\u1ee3c m\u1edf r\u1ed9ng sang n\u1ed3i h\u01a1i, t\u00e0u cao \u00e1p, \u1ed1ng d\u1ea7u, k\u1ebft c\u1ea5u th\u00e9p l\u1edbn, \u00f4 t\u00f4, m\u00e1y k\u00e9o, m\u00e1y m\u00f3c chuy\u1ec3n \u0111\u1ed9ng \u0111\u1ea5t v\u00e0 c\u00e1c s\u1ea3n ph\u1ea9m kh\u00e1c.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Low alloy structural steel refers to the alloy structural steel with total alloy composition less than 5%. The carbon content of this kind of steel is similar to that of low carbon steel, and it is mainly strengthened by a small amount of alloy elements to improve toughness and weldability. Its strength is much higher…<\/p>","protected":false},"author":2,"featured_media":13866,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[79],"tags":[],"jetpack_featured_media_url":"https:\/\/www.meetyoucarbide.com\/wp-content\/uploads\/2019\/12\/\u56fe\u72474.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/18368"}],"collection":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/comments?post=18368"}],"version-history":[{"count":0,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/posts\/18368\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/media\/13866"}],"wp:attachment":[{"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/media?parent=18368"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/categories?post=18368"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.meetyoucarbide.com\/vi\/wp-json\/wp\/v2\/tags?post=18368"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}