{"id":7937,"date":"2024-08-08T06:54:00","date_gmt":"2024-08-07T22:54:00","guid":{"rendered":"https:\/\/app11147.cloudwayssites.com\/?p=7937"},"modified":"2024-12-05T18:31:30","modified_gmt":"2024-12-05T10:31:30","slug":"grade-308","status":"publish","type":"post","link":"https:\/\/steelprogroup.com\/vi\/stainless-steel\/308\/","title":{"rendered":"Th\u00e9p kh\u00f4ng g\u1ec9 308: \u0110\u1ecbnh ngh\u0129a, Th\u00e0nh ph\u1ea7n, T\u00ednh ch\u1ea5t, X\u1eed l\u00fd, \u01afu v\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m, \u1ee8ng d\u1ee5ng v\u00e0 h\u01a1n th\u1ebf n\u1eefa"},"content":{"rendered":"

SteelPRO Group cung c\u1ea5p th\u00e9p kh\u00f4ng g\u1ec9 308 c\u00e1n n\u00f3ng\/l\u1ea1nh theo ti\u00eau chu\u1ea9n ASTM \u1edf d\u1ea1ng t\u1ea5m, l\u00e1, cu\u1ed9n, d\u1ea3i, thanh, que, \u1ed1ng, \u1ed1ng, d\u00e2y, v.v. Ch\u00fang t\u00f4i c\u0169ng c\u00f3 th\u1ec3 s\u1ea3n xu\u1ea5t theo c\u00e1c ti\u00eau chu\u1ea9n qu\u1ed1c t\u1ebf kh\u00e1c nh\u01b0 GB\/T, EN, DIN v\u00e0 JIS theo y\u00eau c\u1ea7u. B\u1ea1n c\u00f3 th\u1ec3 ch\u1ecdn t\u1eeb nhi\u1ec1u lo\u1ea1i b\u1ec1 m\u1eb7t ho\u00e0n thi\u1ec7n, bao g\u1ed3m No.1, 2D, 2B, BA, No.3, No.4, HL, 8K, v.v. C\u00f3 th\u1ec3 giao h\u00e0ng \u1edf d\u1ea1ng c\u00e1n n\u00f3ng (+HR), c\u00e1n ngu\u1ed9i (+CR), \u1ee7 (+A), \u1ee7 dung d\u1ecbch (+SA) v\u00e0 c\u00e1c tr\u1ea1ng th\u00e1i kh\u00e1c. H\u1ea7u h\u1ebft \u0111\u1ec1u c\u00f3 th\u1ec3 t\u00f9y ch\u1ec9nh v\u00e0 ch\u00fang t\u00f4i r\u1ea5t c\u00f3 kh\u1ea3 n\u0103ng t\u00f9y ch\u1ec9nh cho b\u1ea1n.<\/strong> <\/p>

Nh\u1ea5p v\u00e0o \u0111\u00e2y \u0111\u1ec3 duy\u1ec7t qua ph\u1ea1m vi c\u1ee7a ch\u00fang t\u00f4i th\u00e9p kh\u00f4ng g\u1ec9<\/a> c\u00e1c s\u1ea3n ph\u1ea9m.<\/strong><\/p>

Th\u00e9p kh\u00f4ng g\u1ec9 308 l\u00e0 g\u00ec?<\/h2>

308, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 S30800 (UNS), l\u00e0 m\u1ed9t lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 austenit trong d\u00f2ng 300, ch\u1ee7 y\u1ebfu bao g\u1ed3m crom 20% v\u00e0 niken 10%. N\u00f3 tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n nh\u01b0 ASTM A240 (cho t\u1ea5m, l\u00e1 v\u00e0 d\u1ea3i) v\u00e0 AWS A5.9 (cho v\u1eadt li\u1ec7u h\u00e0n ph\u1ee5). C\u00e1c c\u1ea5p t\u01b0\u01a1ng \u0111\u01b0\u01a1ng bao g\u1ed3m X6CrNi19-11 (EN). C\u1ea5p 308 SS \u0111\u01b0\u1ee3c bi\u1ebft \u0111\u1ebfn v\u1edbi kh\u1ea3 n\u0103ng h\u00e0n tuy\u1ec7t v\u1eddi v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m v\u1eadt li\u1ec7u h\u00e0n ph\u1ee5, ch\u1eb3ng h\u1ea1n nh\u01b0 que h\u00e0n ho\u1eb7c d\u00e2y h\u00e0n, \u0111\u1eb7c bi\u1ec7t l\u00e0 \u0111\u1ec3 h\u00e0n 304 ho\u1eb7c c\u00e1c lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 t\u01b0\u01a1ng t\u1ef1. <\/p>

\"T\u1ea5m<\/figure>

<\/p>

T\u1ea1i sao th\u00e9p kh\u00f4ng g\u1ec9 308 \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n?<\/h3>

Th\u00e9p kh\u00f4ng g\u1ec9 308 \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 t\u0103ng kh\u1ea3 n\u0103ng h\u00e0n v\u00e0 \u0111\u00f3ng vai tr\u00f2 l\u00e0 kim lo\u1ea1i ph\u1ee5 hi\u1ec7u qu\u1ea3 trong c\u00e1c \u1ee9ng d\u1ee5ng h\u00e0n. N\u00f3 \u0111\u1eb7c bi\u1ec7t ph\u00f9 h\u1ee3p \u0111\u1ec3 gh\u00e9p th\u00e9p kh\u00f4ng g\u1ec9 304 v\u00e0 c\u00e1c lo\u1ea1i th\u00e9p austenit kh\u00e1c. M\u1ee5c ti\u00eau l\u00e0 s\u1ea3n xu\u1ea5t m\u1ed9t lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 duy tr\u00ec kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n v\u00e0 c\u00e1c \u0111\u1eb7c t\u00ednh c\u01a1 h\u1ecdc tuy\u1ec7t v\u1eddi trong khi v\u1eabn \u0111\u1ea3m b\u1ea3o m\u1ed1i h\u00e0n ch\u1eafc ch\u1eafn v\u00e0 b\u1ec1n. S\u1ef1 ph\u00e1t tri\u1ec3n n\u00e0y c\u00f3 th\u1ec3 di\u1ec5n ra v\u00e0o nh\u1eefng n\u0103m 1950 ho\u1eb7c 1960, th\u1eddi \u0111i\u1ec3m m\u00e0 c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p ng\u00e0y c\u00e0ng c\u1ea7n v\u1eadt li\u1ec7u th\u00e9p kh\u00f4ng g\u1ec9 \u0111\u00e1ng tin c\u1eady v\u00e0 b\u1ec1n b\u1ec9 \u0111\u1ec3 ch\u1ebf t\u1ea1o v\u00e0 x\u00e2y d\u1ef1ng.<\/p>

Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 308<\/h2>

Th\u00e9p kh\u00f4ng g\u1ec9 308 ch\u1ee7 y\u1ebfu bao g\u1ed3m s\u1eaft, crom v\u00e0 niken. S\u1eaft l\u00e0 nguy\u00ean t\u1ed1 c\u01a1 b\u1ea3n t\u1ea1o n\u00ean s\u1ef1 c\u00e2n b\u1eb1ng c\u1ee7a h\u1ee3p kim. Crom l\u00e0 nguy\u00ean t\u1ed1 h\u1ee3p kim cao nh\u1ea5t, dao \u0111\u1ed9ng t\u1eeb 19% \u0111\u1ebfn 21%. Ti\u1ebfp theo l\u00e0 niken, t\u1ea1o n\u00ean 9-11%. Ngo\u00e0i ra, c\u00f2n c\u00f3 m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf mangan, silic v\u00e0 cacbon, c\u00f9ng v\u1edbi m\u1ed9t l\u01b0\u1ee3ng nh\u1ecf ph\u1ed1t pho v\u00e0 l\u01b0u hu\u1ef3nh.<\/p>

Crom, Cr<\/strong><\/td>Niken, Ni<\/strong><\/td>Cacbon, C<\/strong><\/td>Mangan, Mn<\/strong><\/td>Silic, Si<\/strong><\/td>Ph\u1ed1t pho, P<\/strong><\/td>L\u01b0u hu\u1ef3nh, S<\/strong><\/td>S\u1eaft, Fe<\/strong><\/td><\/tr>
20%<\/td>11.0%<\/td>\u22640,08%<\/td>\u22642.00%<\/td>\u22641,0%<\/td>\u22640,045%<\/td>\u22640,030%<\/td>S\u1ef1 c\u00e2n b\u1eb1ng<\/td><\/tr><\/tbody><\/table><\/figure>

T\u00ednh ch\u1ea5t c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 308<\/h2>

Sau \u0111\u00e2y l\u00e0 ba l\u00fd do ch\u00ednh khi\u1ebfn th\u00e9p kh\u00f4ng g\u1ec9 308 tr\u1edf n\u00ean \u0111\u1ed9c \u0111\u00e1o:<\/p>

  1. Kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n tuy\u1ec7t v\u1eddi, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong m\u00f4i tr\u01b0\u1eddng clorua.<\/li>\n\n
  2. \u0110\u1ed9 b\u1ec1n v\u00e0 \u0111\u1ed9 ch\u1ecbu k\u00e9o cao l\u00e0m cho s\u1ea3n ph\u1ea9m n\u00e0y tr\u1edf n\u00ean l\u00fd t\u01b0\u1edfng cho c\u00e1c \u1ee9ng d\u1ee5ng k\u1ebft c\u1ea5u.<\/li>\n\n
  3. Kh\u1ea3 n\u0103ng h\u00e0n t\u1ed1t gi\u00fap gi\u1ea3m thi\u1ec3u nguy c\u01a1 m\u1ed1i h\u00e0n b\u1ecb ph\u00e2n h\u1ee7y.<\/li><\/ol>

    T\u00ednh ch\u1ea5t v\u1eadt l\u00fd<\/h3>

    Ki\u1ec3m tra b\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y \u0111\u1ec3 bi\u1ebft c\u00e1c t\u00ednh ch\u1ea5t v\u1eadt l\u00fd c\u1ed1t l\u00f5i c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 308:<\/p>

    T\u00e0i s\u1ea3n<\/strong><\/td>Gi\u00e1 tr\u1ecb<\/strong><\/td>Hi\u1ec7u su\u1ea5t<\/strong><\/td><\/tr>
    T\u1ec9 tr\u1ecdng<\/td>7,9 g\/cm\u00b3 (0,285 lb\/in\u00b3)<\/td>T\u1ef7 l\u1ec7 \u0111\u1ed9 b\u1ec1n tr\u00ean tr\u1ecdng l\u01b0\u1ee3ng t\u1ed1t g\u00f3p ph\u1ea7n t\u1ea1o n\u00ean s\u1ef1 \u1ed5n \u0111\u1ecbnh v\u00e0 \u0111\u1ed9 b\u1ec1n c\u1ee7a v\u1eadt li\u1ec7u.<\/td><\/tr>
    \u0110i\u1ec3m n\u00f3ng ch\u1ea3y<\/td>1400 \u2013 1455 \u00b0C (2552 \u2013 2651 \u00b0F)<\/td>Cao; th\u00edch h\u1ee3p cho c\u00e1c \u1ee9ng d\u1ee5ng nhi\u1ec7t \u0111\u1ed9 cao.<\/td><\/tr>
    CTE, Tuy\u1ebfn t\u00ednh (0-100\u2103)<\/td>17,3 \u00b5m\/m\u00b0C (9,61 \u00b5in\/in\u00b0F)<\/td>Trung b\u00ecnh; \u0111\u1ea3m b\u1ea3o \u0111\u1ed9 \u1ed5n \u0111\u1ecbnh v\u1ec1 k\u00edch th\u01b0\u1edbc khi nhi\u1ec7t \u0111\u1ed9 thay \u0111\u1ed5i.<\/td><\/tr>
    Nhi\u1ec7t dung ri\u00eang (0-100\u00b0C)<\/td>500 J\/kg\u00b7K (0,119 Btu\/lb\u00b7\u00b0F)<\/td>Hi\u1ec7u qu\u1ea3; th\u00edch h\u1ee3p cho c\u00e1c \u1ee9ng d\u1ee5ng nhi\u1ec7t.<\/td><\/tr>
    \u0110\u1ed9 d\u1eabn nhi\u1ec7t (100\u00b0C)<\/td>15,2 W\/m\u00b7K (8,79 Btu\u00b7ft\/h\u00b7ft\u00b2\u00b7\u00b0F)<\/td>V\u1eeba ph\u1ea3i; c\u00e2n b\u1eb1ng gi\u1eefa s\u1ee9c m\u1ea1nh v\u00e0 hi\u1ec7u su\u1ea5t nhi\u1ec7t.<\/td><\/tr>
    \u0110\u1ed9 d\u1eabn \u0111i\u1ec7n<\/td>1,45 x 10\u2076 S\/m (2,51 % IACS)<\/td>\u0110\u1ed9 d\u1eabn \u0111i\u1ec7n th\u1ea5p; th\u00edch h\u1ee3p \u0111\u1ec3 c\u00e1ch \u0111i\u1ec7n<\/td><\/tr>
    T\u00ednh ch\u1ea5t t\u1eeb t\u00ednh<\/td>Kh\u00f4ng c\u00f3 t\u1eeb t\u00ednh trong \u0111i\u1ec1u ki\u1ec7n \u1ee7; c\u00f3 t\u1eeb t\u00ednh nh\u1eb9 trong \u0111i\u1ec1u ki\u1ec7n gia c\u00f4ng ngu\u1ed9i<\/td>L\u00fd t\u01b0\u1edfng cho c\u00e1c \u1ee9ng d\u1ee5ng kh\u00f4ng t\u1eeb t\u00ednh<\/td><\/tr><\/tbody><\/table><\/figure>

    *CTE, Tuy\u1ebfn t\u00ednh<\/em><\/strong> \u0111\u1ec1 c\u1eadp \u0111\u1ebfn H\u1ec7 s\u1ed1 gi\u00e3n n\u1edf v\u00ec nhi\u1ec7t, tuy\u1ebfn t\u00ednh.<\/em><\/p>

    T\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc<\/h3>

    Ki\u1ec3m tra b\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y \u0111\u1ec3 bi\u1ebft c\u00e1c t\u00ednh ch\u1ea5t c\u01a1 h\u1ecdc c\u1ed1t l\u00f5i c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 308:<\/p>

    T\u00e0i s\u1ea3n<\/strong><\/td>Gi\u00e1 tr\u1ecb<\/strong><\/td>Hi\u1ec7u su\u1ea5t<\/strong><\/td><\/tr>
    \u0110\u1ed9 b\u1ec1n k\u00e9o<\/td>585 MPa (84,8 ksi)<\/td>Trung b\u00ecnh; cao h\u01a1n th\u00e9p m\u1ec1m; th\u1ea5p h\u01a1n th\u00e9p c\u01b0\u1eddng \u0111\u1ed9 cao<\/td><\/tr>
    S\u1ee9c ch\u1ecbu l\u1ef1c<\/td>205 MPa (29,7 ksi)<\/td>Trung b\u00ecnh; cao h\u01a1n h\u1ee3p kim nh\u00f4m; th\u1ea5p h\u01a1n m\u1ed9t s\u1ed1 lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 kh\u00e1c<\/td><\/tr>
    \u0110\u1ed9 c\u1ee9ng Brinell<\/td>150 HB<\/td>V\u1eeba ph\u1ea3i; \u0111i\u1ec3n h\u00ecnh cho th\u00e9p kh\u00f4ng g\u1ec9 austenit; m\u1ec1m h\u01a1n th\u00e9p kh\u00f4ng g\u1ec9 martensitic<\/td><\/tr>
    \u0110\u1ed9 c\u1ee9ng Rockwell<\/td>80 HRB<\/td><\/tr>
    \u0110\u1ed9 c\u1ee9ng Vickers<\/td>157 HV<\/td><\/tr>
    \u0110\u1ed9 gi\u00e3n d\u00e0i khi \u0111\u1ee9t<\/td>55%<\/td>Cao; bi\u1ec3u th\u1ecb \u0111\u1ed9 d\u1ebbo t\u1ed1t, t\u01b0\u01a1ng t\u1ef1 nh\u01b0 c\u00e1c lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 austenit kh\u00e1c<\/td><\/tr>
    M\u00f4 \u0111un Young<\/td>195 GPa (28,3 msi)<\/td>\u0110i\u1ec3n h\u00ecnh; ph\u00f9 h\u1ee3p v\u1edbi h\u1ea7u h\u1ebft th\u00e9p kh\u00f4ng g\u1ec9; c\u1ee9ng h\u01a1n h\u1ee3p kim nh\u00f4m<\/td><\/tr><\/tbody><\/table><\/figure>

    T\u00ednh ch\u1ea5t h\u00f3a h\u1ecdc<\/h3>

    Ki\u1ec3m tra b\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y \u0111\u1ec3 bi\u1ebft c\u00e1c t\u00ednh ch\u1ea5t h\u00f3a h\u1ecdc c\u1ed1t l\u00f5i c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 308:<\/p>

    T\u00ednh ch\u1ea5t h\u00f3a h\u1ecdc<\/strong><\/td>S\u1ef1 mi\u00eau t\u1ea3<\/strong><\/td>Hi\u1ec7u su\u1ea5t<\/strong><\/td><\/tr>
    Ch\u1ed1ng \u0103n m\u00f2n<\/td>Kh\u1ea3 n\u0103ng ch\u1ed1ng oxy h\u00f3a ho\u1eb7c ph\u1ea3n \u1ee9ng h\u00f3a h\u1ecdc<\/td>Cao; t\u1ed1t h\u01a1n th\u00e9p m\u1ec1m, th\u1ea5p h\u01a1n th\u00e9p kh\u00f4ng g\u1ec9 316 m\u1ed9t ch\u00fat trong m\u00f4i tr\u01b0\u1eddng clorua<\/td><\/tr>
    \u0110\u1ed9 nh\u1ea1y pH<\/td>Ph\u1ea3n \u1ee9ng v\u1edbi m\u1ee9c \u0111\u1ed9 pH kh\u00e1c nhau<\/td>Trung b\u00ecnh; \u1ed5n \u0111\u1ecbnh trong \u0111i\u1ec1u ki\u1ec7n trung t\u00ednh \u0111\u1ebfn h\u01a1i axit\/ki\u1ec1m, k\u00e9m \u1ed5n \u0111\u1ecbnh h\u01a1n trong \u0111i\u1ec1u ki\u1ec7n pH kh\u1eafc nghi\u1ec7t<\/td><\/tr>
    Ph\u1ea3n \u1ee9ng<\/td>Xu h\u01b0\u1edbng tr\u1ea3i qua c\u00e1c ph\u1ea3n \u1ee9ng h\u00f3a h\u1ecdc<\/td>Th\u1ea5p; th\u01b0\u1eddng tr\u01a1, nh\u01b0ng ph\u1ea3n \u1ee9ng v\u1edbi axit m\u1ea1nh<\/td><\/tr>
    Kh\u1ea3 n\u0103ng ch\u1ed1ng oxy h\u00f3a<\/td>Kh\u1ea3 n\u0103ng ch\u1ed1ng oxy h\u00f3a b\u1ec1 m\u1eb7t \u1edf nhi\u1ec7t \u0111\u1ed9 cao<\/td>Cao; hi\u1ec7u qu\u1ea3 l\u00ean \u0111\u1ebfn 800\u00b0C, \u00edt h\u01a1n so v\u1edbi h\u1ee3p kim ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao<\/td><\/tr>
    th\u1ee5 \u0111\u1ed9ng h\u00f3a<\/td>S\u1ef1 h\u00ecnh th\u00e0nh l\u1edbp oxit b\u1ea3o v\u1ec7<\/td>Tuy\u1ec7t v\u1eddi; t\u1ea1o th\u00e0nh l\u1edbp m\u00e0ng th\u1ee5 \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh, t\u1ef1 ph\u1ee5c h\u1ed3i<\/td><\/tr>
    Kh\u1ea3 n\u0103ng ch\u00e1y<\/td>Kh\u1ea3 n\u0103ng b\u1eaft l\u1eeda<\/td>Kh\u00f4ng ch\u00e1y<\/td><\/tr>
    T\u00ednh d\u1ec5 ch\u00e1y<\/td>D\u1ec5 d\u00e0ng \u0111\u00e1nh l\u1eeda<\/td>Kh\u00f4ng ch\u00e1y<\/td><\/tr><\/tbody><\/table><\/figure>

    \u0110\u1eb7c \u0111i\u1ec3m x\u1eed l\u00fd c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 308<\/h2>

    Ch\u00fang ta h\u00e3y c\u00f9ng xem x\u00e9t c\u00e1c \u0111\u1eb7c t\u00ednh gia c\u00f4ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 308, ch\u1ee7 y\u1ebfu t\u1eeb b\u1ed1n kh\u00eda c\u1ea1nh t\u1ea1o h\u00ecnh, h\u00e0n, gia c\u00f4ng v\u00e0 x\u1eed l\u00fd nhi\u1ec7t. Kh\u1ea3 n\u0103ng h\u00e0n ch\u1eafc ch\u1eafn l\u00e0 ph\u1ea7n n\u1ed5i b\u1eadt nh\u1ea5t c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 308.<\/p>

    Kh\u1ea3 n\u0103ng \u0111\u1ecbnh h\u00ecnh<\/h3>

    Th\u00e9p kh\u00f4ng g\u1ec9 308 th\u01b0\u1eddng \u0111\u01b0\u1ee3c coi l\u00e0 d\u1ec5 t\u1ea1o h\u00ecnh do \u0111\u1ed9 d\u1ebbo t\u1ed1t, cho ph\u00e9p t\u1ea1o h\u00ecnh m\u00e0 kh\u00f4ng b\u1ecb n\u1ee9t. Th\u00e0nh ph\u1ea7n c\u1ee7a n\u00f3 h\u1ed7 tr\u1ee3 nhi\u1ec1u quy tr\u00ecnh t\u1ea1o h\u00ecnh kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 u\u1ed1n, k\u00e9o v\u00e0 c\u00e1n. Tuy nhi\u00ean, n\u00f3 c\u00f3 th\u1ec3 c\u1ea7n nhi\u1ec1u l\u1ef1c h\u01a1n so v\u1edbi th\u00e9p cacbon do \u0111\u1ed9 b\u1ec1n cao h\u01a1n. C\u00e1c c\u00f4ng c\u1ee5 v\u00e0 k\u1ef9 thu\u1eadt ph\u00f9 h\u1ee3p l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ec3 \u0111\u1ea1t \u0111\u01b0\u1ee3c k\u1ebft qu\u1ea3 t\u1ed1t nh\u1ea5t khi t\u1ea1o h\u00ecnh th\u00e9p kh\u00f4ng g\u1ec9 308.<\/p>

    \"th\u00e9p<\/figure>

    <\/p>

    Kh\u1ea3 n\u0103ng h\u00e0n<\/h3>

    Th\u00e9p kh\u00f4ng g\u1ec9 308 c\u00f3 \u0111\u1ed9 b\u1ec1n cao c\u00f3 th\u1ec3 h\u00e0n \u0111\u01b0\u1ee3c<\/a> do th\u00e0nh ph\u1ea7n c\u00e2n b\u1eb1ng c\u1ee7a n\u00f3, \u0111\u1eb7c bi\u1ec7t l\u00e0 l\u01b0\u1ee3ng crom v\u00e0 niken t\u1ed1i \u01b0u. C\u00e1c nguy\u00ean t\u1ed1 n\u00e0y l\u00e0m gi\u1ea3m nguy c\u01a1 khuy\u1ebft t\u1eadt m\u1ed1i h\u00e0n nh\u01b0 n\u1ee9t v\u00e0 bi\u1ebfn d\u1ea1ng. Trong qu\u00e1 tr\u00ecnh h\u00e0n, th\u00e9p kh\u00f4ng g\u1ec9 308 t\u1ea1o th\u00e0nh c\u1ea5u tr\u00fac austenit \u1ed5n \u0111\u1ecbnh, gi\u1ea3m thi\u1ec3u c\u00e1c v\u1ea5n \u0111\u1ec1 nh\u01b0 n\u1ee9t n\u00f3ng, th\u01b0\u1eddng g\u1eb7p h\u01a1n \u1edf c\u00e1c lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 kh\u00e1c nh\u01b0 304 ho\u1eb7c 316. <\/p>

    Trong khi th\u00e9p kh\u00f4ng g\u1ec9 304 v\u00e0 316 c\u0169ng l\u00e0 th\u00e9p austenit c\u00f3 c\u1ea3 h\u00e0m l\u01b0\u1ee3ng crom v\u00e0 niken v\u00e0 th\u01b0\u1eddng ch\u1ed1ng n\u1ee9t n\u00f3ng, ch\u00fang c\u00f3 th\u1ec3 d\u1ec5 g\u1eb7p v\u1ea5n \u0111\u1ec1 n\u00e0y h\u01a1n trong m\u1ed9t s\u1ed1 \u0111i\u1ec1u ki\u1ec7n nh\u1ea5t \u0111\u1ecbnh. L\u00fd do n\u1eb1m \u1edf th\u00e0nh ph\u1ea7n c\u1ee7a ch\u00fang. V\u00ed d\u1ee5, 316 ch\u1ee9a molypden, c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn qu\u00e1 tr\u00ecnh \u0111\u00f4ng \u0111\u1eb7c v\u00e0 l\u00e0m t\u0103ng nh\u1eb9 nguy c\u01a1 n\u1ee9t n\u00f3ng trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p h\u00e0n. T\u01b0\u01a1ng t\u1ef1 nh\u01b0 v\u1eady, 304 c\u00f3 th\u1ec3 b\u1ecb n\u1ee9t n\u00f3ng n\u1ebfu m\u1ee9c \u0111\u1ed9 t\u1ea1p ch\u1ea5t c\u1ee7a l\u01b0u hu\u1ef3nh v\u00e0 ph\u1ed1t pho kh\u00f4ng \u0111\u01b0\u1ee3c ki\u1ec3m so\u00e1t t\u1ed1t. <\/p>

    So v\u1edbi th\u00e9p cacbon, th\u00e9p kh\u00f4ng g\u1ec9 308 c\u00f3 \u0111\u1ed9 d\u1eabn nhi\u1ec7t th\u1ea5p h\u01a1n v\u00e0 h\u1ec7 s\u1ed1 gi\u00e3n n\u1edf cao h\u01a1n, c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn l\u01b0\u1ee3ng nhi\u1ec7t \u0111\u1ea7u v\u00e0o \u00edt h\u01a1n v\u00e0 nguy c\u01a1 cong v\u00eanh th\u1ea5p h\u01a1n trong qu\u00e1 tr\u00ecnh h\u00e0n. Ngo\u00e0i ra, kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n c\u1ee7a n\u00f3 v\u1eabn cao ngay c\u1ea3 sau khi h\u00e0n, khi\u1ebfn n\u00f3 tr\u1edf n\u00ean th\u00edch h\u1ee3p cho c\u00e1c \u1ee9ng d\u1ee5ng m\u00e0 c\u1ea3 \u0111\u1ed9 b\u1ec1n v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n \u0111\u1ec1u quan tr\u1ecdng.<\/p>

    \"v\u1ecbt<\/figure>

    <\/p>

    B\u1ea1n c\u00f3 th\u1ec3 h\u00e0n 316 v\u1edbi 308 kh\u00f4ng?<\/h4>

    V\u00e2ng, b\u1ea1n c\u00f3 th\u1ec3 h\u00e0n th\u00e9p kh\u00f4ng g\u1ec9 316<\/a> s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u h\u00e0n 308, nh\u01b0ng kh\u00f4ng l\u00fd t\u01b0\u1edfng. V\u1eadt li\u1ec7u h\u00e0n 308 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 h\u00e0n th\u00e9p kh\u00f4ng g\u1ec9 304 v\u00e0 kh\u00f4ng ch\u1ee9a molypden, c\u00f3 trong th\u00e9p kh\u00f4ng g\u1ec9 316 v\u00e0 cung c\u1ea5p kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n b\u1ed5 sung. Do \u0111\u00f3, m\u1ed1i h\u00e0n s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u h\u00e0n 308 c\u00f3 th\u1ec3 k\u00e9m ch\u1ed1ng \u0103n m\u00f2n h\u01a1n, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong m\u00f4i tr\u01b0\u1eddng kh\u1eafc nghi\u1ec7t. \u0110\u1ec3 c\u00f3 hi\u1ec7u su\u1ea5t v\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n t\u1ed1i \u01b0u, t\u1ed1t h\u01a1n l\u00e0 s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u h\u00e0n 316 ho\u1eb7c 316L khi h\u00e0n th\u00e9p kh\u00f4ng g\u1ec9 316.<\/p>

    B\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng th\u00e9p 308 tr\u00ean th\u00e9p m\u1ec1m kh\u00f4ng?<\/h4>

    Kh\u00f4ng, b\u1ea1n kh\u00f4ng n\u00ean s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u h\u00e0n 308 tr\u00ean th\u00e9p m\u1ec1m. V\u1eadt li\u1ec7u h\u00e0n 308 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 h\u00e0n th\u00e9p kh\u00f4ng g\u1ec9 v\u00e0 kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi th\u00e9p m\u1ec1m. S\u1eed d\u1ee5ng 308 tr\u00ean th\u00e9p m\u1ec1m c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn ch\u1ea5t l\u01b0\u1ee3ng m\u1ed1i h\u00e0n k\u00e9m, bao g\u1ed3m c\u00e1c v\u1ea5n \u0111\u1ec1 nh\u01b0 n\u1ee9t v\u00e0 m\u1ed1i h\u00e0n y\u1ebfu do s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 th\u00e0nh ph\u1ea7n v\u1eadt li\u1ec7u. \u0110\u1ed1i v\u1edbi th\u00e9p m\u1ec1m, t\u1ed1t nh\u1ea5t l\u00e0 s\u1eed d\u1ee5ng v\u1eadt li\u1ec7u h\u00e0n \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf ri\u00eang cho th\u00e9p m\u1ec1m, ch\u1eb3ng h\u1ea1n nh\u01b0 ER70S-6.<\/p>

    Kh\u1ea3 n\u0103ng gia c\u00f4ng<\/h3>

    Th\u00e9p kh\u00f4ng g\u1ec9 308 th\u01b0\u1eddng \u0111\u01b0\u1ee3c coi l\u00e0 kh\u00f3 gia c\u00f4ng do \u0111\u1ed9 b\u1ec1n v\u00e0 xu h\u01b0\u1edbng l\u00e0m c\u1ee9ng khi gia c\u00f4ng. Khi gia c\u00f4ng th\u00e9p kh\u00f4ng g\u1ec9 308, \u0111i\u1ec1u quan tr\u1ecdng l\u00e0 ph\u1ea3i s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng c\u1ee5 s\u1eafc b\u00e9n v\u00e0 duy tr\u00ec t\u1ed1c \u0111\u1ed9 c\u1eaft \u1ed5n \u0111\u1ecbnh \u0111\u1ec3 tr\u00e1nh t\u00edch t\u1ee5 nhi\u1ec7t qu\u00e1 m\u1ee9c. B\u00f4i tr\u01a1n ho\u1eb7c ch\u1ea5t l\u1ecfng c\u1eaft th\u00edch h\u1ee3p c\u0169ng c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n quy tr\u00ecnh gia c\u00f4ng b\u1eb1ng c\u00e1ch gi\u1ea3m nhi\u1ec7t v\u00e0 ma s\u00e1t. Ngo\u00e0i ra, s\u1eed d\u1ee5ng t\u1ed1c \u0111\u1ed9 n\u1ea1p ch\u1eadm gi\u00fap gi\u1ea3m thi\u1ec3u r\u1ee7i ro l\u00e0m c\u1ee9ng khi gia c\u00f4ng, c\u00f3 th\u1ec3 khi\u1ebfn quy tr\u00ecnh gia c\u00f4ng tr\u1edf n\u00ean kh\u00f3 kh\u0103n h\u01a1n v\u00e0 l\u00e0m gi\u1ea3m tu\u1ed5i th\u1ecd c\u1ee7a d\u1ee5ng c\u1ee5.<\/p>

    \u0110\u1ed9 c\u1ee9ng<\/h3>

    Gi\u1ed1ng nh\u01b0 304 v\u00e0 316, 308 kh\u00f4ng th\u1ec3 \u0111\u01b0\u1ee3c l\u00e0m c\u1ee9ng th\u00f4ng qua x\u1eed l\u00fd nhi\u1ec7t. \u0110i\u1ec1u n\u00e0y l\u00e0 do n\u00f3 l\u00e0 th\u00e9p kh\u00f4ng g\u1ec9 austenit, kh\u00f4ng ph\u1ea3n \u1ee9ng v\u1edbi x\u1eed l\u00fd nhi\u1ec7t \u0111\u1ec3 l\u00e0m c\u1ee9ng do c\u1ea5u tr\u00fac tinh th\u1ec3 c\u1ee7a n\u00f3. Thay v\u00e0o \u0111\u00f3, th\u00e9p kh\u00f4ng g\u1ec9 308 duy tr\u00ec ho\u1eb7c t\u0103ng c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a n\u00f3 th\u00f4ng qua c\u00e1c quy tr\u00ecnh l\u00e0m vi\u1ec7c l\u1ea1nh nh\u01b0 c\u00e1n ho\u1eb7c u\u1ed1n.<\/p>

    \u01afu \u0111i\u1ec3m v\u00e0 nh\u01b0\u1ee3c \u0111i\u1ec3m c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 308 l\u00e0 g\u00ec?<\/h2>

    Sau \u0111\u00e2y l\u00e0 nh\u1eefng \u01b0u \u0111i\u1ec3m v\u00e0 l\u1ee3i \u00edch c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 308:<\/p>

    1. Kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n m\u1ea1nh, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong m\u00f4i tr\u01b0\u1eddng c\u00f3 t\u00ednh axit.<\/li>\n\n
    2. Kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t t\u1ed1t, ph\u00f9 h\u1ee3p cho c\u00e1c \u1ee9ng d\u1ee5ng nhi\u1ec7t \u0111\u1ed9 cao.<\/li>\n\n
    3. B\u1ec1n b\u1ec9 v\u00e0 l\u00e2u d\u00e0i, mang l\u1ea1i \u0111\u1ed9 tin c\u1eady theo th\u1eddi gian.<\/li>\n\n
    4. Kh\u1ea3 n\u0103ng h\u00e0n t\u1ed1t, cho ph\u00e9p ch\u1ebf t\u1ea1o v\u00e0 thi c\u00f4ng d\u1ec5 d\u00e0ng h\u01a1n.<\/li>\n\n
    5. \u0110a n\u0103ng, ph\u00f9 h\u1ee3p v\u1edbi nhi\u1ec1u \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p v\u00e0 th\u01b0\u01a1ng m\u1ea1i.<\/li><\/ol>

      Nh\u1eefng nh\u01b0\u1ee3c \u0111i\u1ec3m v\u00e0 h\u1ea1n ch\u1ebf c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 308 \u0111\u01b0\u1ee3c li\u1ec7t k\u00ea d\u01b0\u1edbi \u0111\u00e2y:<\/p>

      1. D\u1ec5 b\u1ecb n\u1ee9t do \u0103n m\u00f2n \u1ee9ng su\u1ea5t trong m\u1ed9t s\u1ed1 m\u00f4i tr\u01b0\u1eddng nh\u1ea5t \u0111\u1ecbnh.<\/li>\n\n
      2. Kh\u00f4ng ph\u00f9 h\u1ee3p v\u1edbi m\u00f4i tr\u01b0\u1eddng c\u00f3 h\u00e0m l\u01b0\u1ee3ng clorua cao v\u00ec c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn hi\u1ec7n t\u01b0\u1ee3ng r\u1ed7.<\/li>\n\n
      3. Chi ph\u00ed cao h\u01a1n so v\u1edbi c\u00e1c lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 kh\u00e1c.<\/li>\n\n
      4. C\u1ea7n c\u00f3 k\u1ef9 thu\u1eadt h\u00e0n c\u1ee5 th\u1ec3 \u0111\u1ec3 duy tr\u00ec c\u00e1c \u0111\u1eb7c t\u00ednh c\u1ee7a n\u00f3, l\u00e0m t\u0103ng \u0111\u1ed9 ph\u1ee9c t\u1ea1p khi ch\u1ebf t\u1ea1o.<\/li>\n\n
      5. Kh\u1ea3 n\u0103ng t\u1ea1o h\u00ecnh k\u00e9m h\u01a1n, khi\u1ebfn vi\u1ec7c t\u1ea1o h\u00ecnh ho\u1eb7c \u0111\u00fac khu\u00f4n tr\u1edf n\u00ean kh\u00f3 kh\u0103n h\u01a1n.<\/li><\/ol>

        \u1ee8ng d\u1ee5ng ph\u1ed5 bi\u1ebfn c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 308<\/h2>

        \u0110\u1ec3 thu\u1eadn ti\u1ec7n, h\u00e3y ki\u1ec3m tra b\u1ea3ng b\u00ean d\u01b0\u1edbi \u0111\u1ec3 hi\u1ec3u nhanh:<\/p>

        Ng\u00e0nh c\u00f4ng nghi\u1ec7p<\/strong><\/td>\u1ee8ng d\u1ee5ng<\/strong><\/td>T\u1ea1i sao l\u1ea1i l\u00e0 308 Suits<\/strong><\/td><\/tr>
        H\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5<\/td>Khung m\u00e1y bay, \u0111\u1ed9ng c\u01a1 ph\u1ea3n l\u1ef1c, b\u00e1nh \u0111\u00e1p, h\u1ec7 th\u1ed1ng x\u1ea3<\/td>\u0110\u1ed9 b\u1ec1n cao \u1edf nhi\u1ec7t \u0111\u1ed9 cao, kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n tuy\u1ec7t v\u1eddi.<\/td><\/tr>
        \u00d4 t\u00f4<\/td>\u1ed0ng x\u1ea3, b\u1ed9 chuy\u1ec3n \u0111\u1ed5i x\u00fac t\u00e1c, \u1ed1ng gi\u1ea3m thanh, b\u00ecnh nhi\u00ean li\u1ec7u<\/td>Kh\u1ea3 n\u0103ng ch\u1ed1ng oxy h\u00f3a t\u1ed1t, l\u00fd t\u01b0\u1edfng cho c\u00e1c b\u1ed9 ph\u1eadn \u00f4 t\u00f4 ch\u1ecbu nhi\u1ec7t \u0111\u1ed9 cao.<\/td><\/tr>
        S\u1ef1 thi c\u00f4ng<\/td>Th\u00e0nh ph\u1ea7n k\u1ebft c\u1ea5u, m\u1eb7t ti\u1ec1n, m\u00e1i, d\u1ea7m \u0111\u1ee1<\/td>\u0110\u1ed9 b\u1ec1n k\u00e9o cao, \u0111\u1ed9 b\u1ec1n v\u00e0 t\u00ednh to\u00e0n v\u1eb9n v\u1ec1 m\u1eb7t c\u1ea5u tr\u00fac.<\/td><\/tr>
        X\u1eed l\u00fd h\u00f3a h\u1ecdc<\/td>B\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t, b\u1ed3n ch\u1ee9a, \u0111\u01b0\u1eddng \u1ed1ng, b\u00ecnh ch\u1ecbu \u00e1p su\u1ea5t<\/td>Ch\u1ed1ng \u0103n m\u00f2n h\u00f3a h\u1ecdc, ch\u1ecbu \u0111\u01b0\u1ee3c \u00e1p su\u1ea5t cao.<\/td><\/tr><\/tbody><\/table><\/figure>

        308 ph\u00f9 h\u1ee3p nh\u1ea5t v\u1edbi m\u1ee5c \u0111\u00edch g\u00ec?<\/h3>

        Th\u00e9p kh\u00f4ng g\u1ec9 308 l\u00e0 lo\u1ea1i th\u00e9p t\u1ed1t nh\u1ea5t cho c\u00e1c \u1ee9ng d\u1ee5ng h\u00e0n, \u0111\u1eb7c bi\u1ec7t l\u00e0 khi h\u00e0n th\u00e9p kh\u00f4ng g\u1ec9 c\u00f3 th\u00e0nh ph\u1ea7n t\u01b0\u01a1ng t\u1ef1, nh\u01b0 th\u00e9p kh\u00f4ng g\u1ec9 304. N\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong s\u1ea3n xu\u1ea5t que h\u00e0n v\u00e0 d\u00e2y h\u00e0n.<\/p>

        C\u00e1c c\u1ea5p \u0111\u1ed9 t\u01b0\u01a1ng \u0111\u01b0\u01a1ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 308 \u1edf c\u00e1c qu\u1ed1c gia v\u00e0 khu v\u1ef1c kh\u00e1c nhau<\/h2>

        Sau \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 c\u1ea5p t\u01b0\u01a1ng \u0111\u01b0\u01a1ng ph\u1ed5 bi\u1ebfn c\u1ee7a 308 SS \u1edf c\u00e1c qu\u1ed1c gia v\u00e0 khu v\u1ef1c kh\u00e1c nhau:<\/p>

        Qu\u1ed1c gia<\/strong><\/td>Ti\u00eau chu\u1ea9n\/\u0110\u1eb7c \u0111i\u1ec3m k\u1ef9 thu\u1eadt<\/strong><\/td>L\u1edbp t\u01b0\u01a1ng \u0111\u01b0\u01a1ng<\/strong><\/td><\/tr>
        Trung Qu\u1ed1c<\/td>GB\/T3280<\/td>0Cr21Ni10<\/td><\/tr>
        Hoa K\u1ef3<\/td>Ti\u00eau chu\u1ea9n ASTMA240<\/td>308<\/td><\/tr>
        \u0110\u1ee9c<\/td>Ti\u00eau chu\u1ea9n DIN EN 10088-2<\/td>1.4316 (X6CrNi19-11)<\/td><\/tr>
        Nga<\/td>TI\u00caU CHU\u1ea8N 5632<\/td>12X19H9<\/td><\/tr>
        Ch\u00e2u \u00c2u<\/td>EN 10088-2<\/td>X6CrNi19-11 (1.4316)<\/td><\/tr>
        Nh\u1eadt B\u1ea3n<\/td>Ti\u00eau chu\u1ea9n JIS G4303<\/td>Th\u00e9p kh\u00f4ng g\u1ec9 308<\/td><\/tr>
        Anh qu\u1ed1c<\/td>BS 1449<\/td>308S25<\/td><\/tr><\/tbody><\/table><\/figure>

        So s\u00e1nh gi\u1eefa th\u00e9p kh\u00f4ng g\u1ec9 308 so v\u1edbi 304 so v\u1edbi 316<\/h2>

        H\u00e3y xem b\u1ea3ng d\u01b0\u1edbi \u0111\u00e2y \u0111\u1ec3 c\u00f3 s\u1ef1 so s\u00e1nh nhanh gi\u1eefa ba lo\u1ea1i:<\/p>

        T\u00e0i s\u1ea3n<\/strong><\/td>308<\/strong><\/td>304<\/a><\/strong><\/td>316<\/a><\/strong><\/td><\/tr>
        Ki\u1ec3u<\/td>Austenit<\/td>Austenit<\/td>Austenit<\/td><\/tr>
        C\u1ea5u tr\u00fac tinh th\u1ec3<\/td>FCC (Kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng t\u00e2m m\u1eb7t)<\/td>FCC (Kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng t\u00e2m m\u1eb7t)<\/td>FCC (Kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng t\u00e2m m\u1eb7t)<\/td><\/tr>
        Th\u00e0nh ph\u1ea7n ch\u00ednh<\/td>Cr: 20%, Ni: 11%<\/td>Cr: 18-20%, Ni: 8-10,5%<\/td>Cr: \uff0818%, Mo: \uff083%, Ni: \uff0814%<\/td><\/tr>
        Ch\u1ed1ng \u0103n m\u00f2n<\/td>V\u1eeba ph\u1ea3i<\/td>T\u1ed1t<\/td>Xu\u1ea5t s\u1eafc<\/td><\/tr>
        S\u1ee9c m\u1ea1nh<\/td>T\u1ed1t<\/td>T\u1ed1t<\/td>Cao h\u01a1n<\/td><\/tr>
        \u0110\u1ed9 c\u1ee9ng<\/td>V\u1eeba ph\u1ea3i<\/td>V\u1eeba ph\u1ea3i<\/td>V\u1eeba ph\u1ea3i<\/td><\/tr>
        Kh\u1ea3 n\u0103ng h\u00e0n<\/td>T\u1ed1t<\/td>Xu\u1ea5t s\u1eafc<\/td>T\u1ed1t<\/td><\/tr>
        T\u00ednh ch\u1ea5t t\u1eeb t\u00ednh<\/td>Kh\u00f4ng t\u1eeb t\u00ednh<\/td>Kh\u00f4ng t\u1eeb t\u00ednh<\/td>Kh\u00f4ng t\u1eeb t\u00ednh<\/td><\/tr>
        Tr\u1ecb gi\u00e1<\/td>Cao h\u01a1n 304<\/td>\u0110\u01b0\u1eddng c\u01a1 s\u1edf<\/td>Cao h\u01a1n 304<\/td><\/tr>
        \u1ee8ng d\u1ee5ng<\/td>H\u00e0n, ch\u1ebf t\u1ea1o, trao \u0111\u1ed5i nhi\u1ec7t<\/td>\u1ee8ng d\u1ee5ng m\u1ee5c \u0111\u00edch chung<\/td>H\u00e0ng h\u1ea3i, ch\u1ebf bi\u1ebfn h\u00f3a ch\u1ea5t, thi\u1ebft b\u1ecb y t\u1ebf<\/td><\/tr><\/tbody><\/table><\/figure>

        Nh\u1eefng g\u00ec b\u1ea1n c\u0169ng c\u00f3 th\u1ec3 quan t\u00e2m<\/h2>

        B\u00e2y gi\u1edd b\u1ea1n \u0111\u00e3 hi\u1ec3u s\u00e2u h\u01a1n v\u1ec1 th\u00e9p kh\u00f4ng g\u1ec9 308, v\u1eabn c\u00f2n m\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 ph\u1ed5 bi\u1ebfn \u0111\u00e1ng \u0111\u1ec3 b\u1ea1n l\u01b0u \u00fd:<\/p>

        Th\u00e9p kh\u00f4ng g\u1ec9 308 c\u00f3 t\u1eeb t\u00ednh kh\u00f4ng?<\/h3>

        Th\u00e9p kh\u00f4ng g\u1ec9 308 th\u01b0\u1eddng kh\u00f4ng t\u1eeb t\u00ednh<\/a> v\u00ec n\u00f3 c\u00f3 c\u1ea5u tr\u00fac tinh th\u1ec3 austenit, \u0111\u01b0\u1ee3c \u1ed5n \u0111\u1ecbnh b\u1eb1ng c\u00e1ch b\u1ed5 sung niken. C\u1ea5u tr\u00fac n\u00e0y kh\u00f4ng c\u00f3 t\u00ednh ch\u1ea5t t\u1eeb t\u00ednh \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y trong c\u00e1c lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9 kh\u00e1c, nh\u01b0 c\u00e1c lo\u1ea1i ferritic ho\u1eb7c martensitic. Tuy nhi\u00ean, n\u00f3 c\u00f3 th\u1ec3 tr\u1edf n\u00ean h\u01a1i t\u1eeb t\u00ednh sau khi l\u00e0m ngu\u1ed9i.<\/p>

        Th\u00e9p kh\u00f4ng g\u1ec9 304 hay 308 t\u1ed1t h\u01a1n?<\/h3>

        Th\u00e9p kh\u00f4ng g\u1ec9 304 th\u01b0\u1eddng t\u1ed1t h\u01a1n cho h\u1ea7u h\u1ebft c\u00e1c \u1ee9ng d\u1ee5ng do t\u00ednh linh ho\u1ea1t v\u00e0 chi ph\u00ed th\u1ea5p h\u01a1n. Tuy nhi\u00ean, 308 \u0111\u01b0\u1ee3c \u01b0a chu\u1ed9ng h\u01a1n cho c\u00e1c \u1ee9ng d\u1ee5ng h\u00e0n do h\u00e0m l\u01b0\u1ee3ng crom v\u00e0 niken cao h\u01a1n, mang l\u1ea1i kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t v\u00e0 ch\u1ed1ng \u0103n m\u00f2n t\u1ed1t h\u01a1n \u1edf c\u00e1c m\u1ed1i h\u00e0n.<\/p>

        <\/p>","protected":false},"excerpt":{"rendered":"

        SteelPRO Group cung c\u1ea5p th\u00e9p kh\u00f4ng g\u1ec9 308 c\u00e1n n\u00f3ng\/l\u1ea1nh theo ti\u00eau chu\u1ea9n ASTM d\u01b0\u1edbi d\u1ea1ng t\u1ea5m, l\u00e1, cu\u1ed9n, d\u1ea3i, thanh, que, \u1ed1ng, d\u00e2y, v.v. [\u2026]<\/p>","protected":false},"author":1,"featured_media":7939,"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":[4191,112],"tags":[4275],"class_list":["post-7937","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-grades","category-stainless-steel","tag-featured"],"acf":[],"_links":{"self":[{"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/posts\/7937","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=7937"}],"version-history":[{"count":0,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/posts\/7937\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/media\/7939"}],"wp:attachment":[{"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/media?parent=7937"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/categories?post=7937"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/steelprogroup.com\/vi\/wp-json\/wp\/v2\/tags?post=7937"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}