{"id":6904,"date":"2022-02-10T01:53:16","date_gmt":"2022-02-09T17:53:16","guid":{"rendered":"https:\/\/xzfastener.com\/?p=6904"},"modified":"2026-06-23T01:55:03","modified_gmt":"2026-06-22T17:55:03","slug":"stainless-steel-bolt-grades-a2-70-a4-70-and-a4-80-explained","status":"publish","type":"post","link":"https:\/\/xzfastener.com\/vi\/stainless-steel-bolt-grades-a2-70-a4-70-and-a4-80-explained\/","title":{"rendered":"C\u00e1c c\u1ea5p \u0111\u1ed9 bu l\u00f4ng b\u1eb1ng th\u00e9p kh\u00f4ng g\u1ec9: A2-70, A4-70 v\u00e0 A4-80 Gi\u1ea3i th\u00edch"},"content":{"rendered":"

C\u00e1c lo\u1ea1i bu l\u00f4ng th\u00e9p kh\u00f4ng g\u1ec9 th\u01b0\u1eddng b\u1ecb hi\u1ec3u nh\u1ea7m khi mua h\u00e0ng. Ng\u01b0\u1eddi mua c\u00f3 th\u1ec3 y\u00eau c\u1ea7u \u201c304 bu l\u00f4ng kh\u00f4ng g\u1ec9\u201d ho\u1eb7c \u201c316 bu l\u00f4ng kh\u00f4ng g\u1ec9,\u201d nh\u01b0ng d\u1ea5u hi\u1ec7u tr\u00ean chi ti\u1ebft si\u1ebft ch\u1eb7t th\u1ef1c t\u1ebf th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n d\u01b0\u1edbi d\u1ea1ng A2-70, A4-70, ho\u1eb7c A4-80.<\/p>\n\n\n\n

Nh\u1eefng d\u1ea5u hi\u1ec7u n\u00e0y cho bi\u1ebft hai \u0111i\u1ec1u: nh\u00f3m th\u00e9p kh\u00f4ng g\u1ec9 v\u00e0 l\u1edbp thu\u1ed9c t\u00ednh c\u01a1 h\u1ecdc. C\u1ea3 hai \u0111\u1ec1u quan tr\u1ecdng.<\/p>\n\n\n\n

\u00dd ngh\u0129a c\u1ee7a A2 v\u00e0 A4<\/h2>\n\n\n\n

Nh\u00f3m th\u00e9p kh\u00f4ng g\u1ec9<\/h3>\n\n\n\n

A2 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c \u1ed1c v\u00edt kh\u00f4ng g\u1ec9 ch\u1ed1ng \u0103n m\u00f2n n\u00f3i chung. N\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p v\u1edbi lo\u1ea1i th\u00e9p kh\u00f4ng g\u1ec9. (304)<\/p>\n\n\n\n

A4 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng khi c\u1ea7n kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n m\u1ea1nh h\u01a1n. N\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c k\u1ebft h\u1ee3p v\u1edbi th\u00e9p kh\u00f4ng g\u1ec9 lo\u1ea1i 316 v\u00e0 \u0111\u01b0\u1ee3c \u01b0a th\u00edch trong m\u00f4i tr\u01b0\u1eddng clorua, bi\u1ec3n, h\u00f3a ch\u1ea5t ho\u1eb7c \u1ea9m \u01b0\u1edbt.<\/p>\n\n\n\n

Ng\u01b0\u1eddi mua c\u00f3 th\u1ec3 xem x\u00e9t \u1ed1c v\u00edt b\u1eb1ng th\u00e9p kh\u00f4ng g\u1ec9<\/a> khi l\u1ef1a ch\u1ecdn gi\u1eefa v\u1eadt li\u1ec7u A2 v\u00e0 A4.<\/p>\n\n\n\n

70 v\u00e0 80 ngh\u0129a l\u00e0 g\u00ec<\/h2>\n\n\n\n

L\u1edbp thu\u1ed9c t\u00ednh c\u01a1 kh\u00ed<\/h3>\n\n\n\n

S\u1ed1 sau d\u1ea5u g\u1ea1ch ngang cho bi\u1ebft lo\u1ea1i thu\u1ed9c t\u00ednh. Trong \u0111i\u1ec1u ki\u1ec7n mua h\u00e0ng th\u1ef1c t\u1ebf, 70 c\u00f3 ngh\u0129a l\u00e0 m\u1ee9c \u0111\u1ed9 b\u1ec1n k\u00e9o t\u1ed1i thi\u1ec3u kho\u1ea3ng 700 MPa, trong khi 80 c\u00f3 ngh\u0129a l\u00e0 kho\u1ea3ng 800 MPa.<\/p>\n\n\n\n

L\u1edbp<\/th>Nh\u00f3m v\u1eadt li\u1ec7u th\u00f4ng d\u1ee5ng<\/th>L\u1edbp s\u1ee9c m\u1ea1nh<\/th>S\u1eed d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/th><\/tr><\/thead>
A2-70<\/td>304 lo\u1ea1i kh\u00f4ng g\u1ec9<\/td>700 MPa class<\/td>M\u00e1y m\u00f3c th\u00f4ng d\u1ee5ng, s\u1eed d\u1ee5ng trong nh\u00e0, ngo\u00e0i tr\u1eddi nh\u1eb9<\/td><\/tr>
A4-70<\/td>316 lo\u1ea1i kh\u00f4ng g\u1ec9<\/td>700 MPa class<\/td>H\u00e0ng h\u1ea3i, \u1ea9m \u01b0\u1edbt, h\u00f3a ch\u1ea5t, s\u1eed d\u1ee5ng ngo\u00e0i tr\u1eddi<\/td><\/tr>
A4-80<\/td>316 lo\u1ea1i kh\u00f4ng g\u1ec9<\/td>800 MPa class<\/td>C\u00e1c c\u1ee5m ch\u1ed1ng \u0103n m\u00f2n ch\u1ecbu t\u1ea3i cao h\u01a1n<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u0110\u1ed1i v\u1edbi c\u00e1c \u1ee9ng d\u1ee5ng ch\u1ecbu t\u1ea3i, ng\u01b0\u1eddi mua n\u00ean so s\u00e1nh c\u00e1c lo\u1ea1i kh\u00f4ng g\u1ec9 v\u1edbi \u1ed1c v\u00edt c\u01b0\u1eddng \u0111\u1ed9 cao<\/a> tr\u01b0\u1edbc khi thay th\u1ebf bu l\u00f4ng th\u00e9p carbon b\u1eb1ng th\u00e9p kh\u00f4ng g\u1ec9.<\/p>\n\n\n\n

A2-70 vs A4-70<\/h2>\n\n\n\n

Kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n l\u00e0 s\u1ef1 kh\u00e1c bi\u1ec7t ch\u00ednh<\/h3>\n\n\n\n

A2-70 ph\u00f9 h\u1ee3p cho nhi\u1ec1u m\u1ee5c \u0111\u00edch s\u1eed d\u1ee5ng c\u00f4ng nghi\u1ec7p n\u00f3i chung. N\u00f3 ho\u1ea1t \u0111\u1ed9ng t\u1ed1t trong m\u00f4i tr\u01b0\u1eddng kh\u00f4 r\u00e1o trong nh\u00e0 v\u00e0 ti\u1ebfp x\u00fac ngo\u00e0i tr\u1eddi v\u1eeba ph\u1ea3i.<\/p>\n\n\n\n

A4-70 s\u1ebd t\u1ed1t h\u01a1n khi nguy c\u01a1 \u0103n m\u00f2n n\u00f3i chung cao h\u01a1n. N\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c ch\u1ecdn cho ph\u1ea7n c\u1ee9ng h\u00e0ng h\u1ea3i, thi\u1ebft b\u1ecb ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m, c\u00f4ng tr\u00ecnh ven bi\u1ec3n v\u00e0 \u1ee9ng d\u1ee5ng nh\u00e0 m\u00e1y h\u00f3a ch\u1ea5t.<\/p>\n\n\n\n

\u0110\u1ed1i v\u1edbi c\u00e1c l\u1ef1a ch\u1ecdn thay th\u1ebf l\u1edbp ph\u1ee7 kh\u00f4ng g\u1ec9, ng\u01b0\u1eddi mua c\u0169ng c\u00f3 th\u1ec3 xem x\u00e9t \u1ed1c v\u00edt tr\u00e1ng kh\u00e1c nhau<\/a>.<\/p>\n\n\n\n

A4-70 vs A4-80<\/h2>\n\n\n\n

C\u00f9ng m\u1ed9t nh\u00f3m \u0103n m\u00f2n, l\u1edbp c\u01b0\u1eddng \u0111\u1ed9 cao h\u01a1n<\/h3>\n\n\n\n

A4-80 mang l\u1ea1i \u0111\u1ed9 b\u1ec1n k\u00e9o cao h\u01a1n A4-70 trong khi v\u1eabn s\u1eed d\u1ee5ng nh\u00f3m inox A4. N\u00f3 r\u1ea5t h\u1eefu \u00edch khi c\u1ea7n c\u1ea3 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n v\u00e0 hi\u1ec7u su\u1ea5t c\u01a1 h\u1ecdc cao h\u01a1n.<\/p>\n\n\n\n

Tuy nhi\u00ean, A4-80 kh\u00f4ng n\u00ean \u0111\u01b0\u1ee3c l\u1ef1a ch\u1ecdn m\u1ed9t c\u00e1ch m\u00f9 qu\u00e1ng. X\u00e1c nh\u1eadn c\u00e1c y\u00eau c\u1ea7u v\u1ec1 ph\u01b0\u01a1ng ph\u00e1p si\u1ebft ch\u1eb7t, kh\u1edbp \u0111ai \u1ed1c, r\u1ee7i ro m\u00f2n, \u0111\u1ed9 kh\u00edt ren v\u00e0 b\u00e1o c\u00e1o ki\u1ec3m tra.<\/p>\n\n\n\n

Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ee7a ng\u01b0\u1eddi mua<\/h2>\n\n\n\n

Tr\u00e1nh nh\u1eefng v\u1ea5n \u0111\u1ec1 sau:<\/p>\n\n\n\n

    \n
  1. Gi\u1ea3 s\u1eed th\u00e9p kh\u00f4ng g\u1ec9 lu\u00f4n b\u1ec1n h\u01a1n th\u00e9p h\u1ee3p kim.<\/li>\n\n\n\n
  2. S\u1eed d\u1ee5ng A2 khi ti\u1ebfp x\u00fac v\u1edbi clorua m\u1ea1nh.<\/li>\n\n\n\n
  3. \u0110\u1eb7t h\u00e0ng \u201c316 bu l\u00f4ng\u201d kh\u00f4ng c\u00f3 l\u1edbp thu\u1ed9c t\u00ednh.<\/li>\n\n\n\n
  4. Tr\u1ed9n bu l\u00f4ng A4 v\u1edbi \u0111ai \u1ed1c ho\u1eb7c v\u00f2ng \u0111\u1ec7m kh\u00f4ng ph\u00f9 h\u1ee3p.<\/li>\n\n\n\n
  5. B\u1ecf qua hi\u1ec7n t\u01b0\u1ee3ng \u0103n m\u00f2n trong qu\u00e1 tr\u00ecnh l\u1eafp r\u00e1p kh\u00f4ng g\u1ec9.<\/li>\n\n\n\n
  6. Qu\u00ean MTC v\u00e0 truy xu\u1ea5t ngu\u1ed3n g\u1ed1c h\u00e0ng lo\u1ea1t cho c\u00e1c \u0111\u01a1n h\u00e0ng d\u1ef1 \u00e1n.<\/li>\n<\/ol>\n\n\n\n

    \u0110\u1ed1i v\u1edbi bu l\u00f4ng kh\u00f4ng g\u1ec9 ti\u00eau chu\u1ea9n, h\u00e3y b\u1eaft \u0111\u1ea7u t\u1eeb \u1ed1c v\u00edt ti\u00eau chu\u1ea9n<\/a>. \u0110\u1ed1i v\u1edbi \u0111\u1ed9 d\u00e0i, s\u1ee3i ho\u1eb7c ki\u1ec3u \u0111\u1ea7u \u0111\u1eb7c bi\u1ec7t, h\u00e3y s\u1eed d\u1ee5ng \u1ed1c v\u00edt phi ti\u00eau chu\u1ea9n t\u00f9y ch\u1ec9nh<\/a>.<\/p>\n\n\n\n

    L\u1eddi khuy\u00ean cu\u1ed1i c\u00f9ng<\/h2>\n\n\n\n

    A2-70, A4-70, v\u00e0 A4-80 kh\u00f4ng ch\u1ec9 l\u00e0 t\u00ean v\u1eadt ch\u1ea5t. H\u1ecd k\u1ebft h\u1ee3p nh\u00f3m th\u00e9p kh\u00f4ng g\u1ec9 v\u00e0 l\u1edbp s\u1ee9c m\u1ea1nh.<\/p>\n\n\n\n

    Ch\u1ecdn A2-70 \u0111\u1ec3 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n n\u00f3i chung, A4-70 \u0111\u1ec3 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n m\u1ea1nh h\u01a1n, v\u00e0 A4-80 khi c\u0169ng c\u1ea7n c\u01b0\u1eddng \u0111\u1ed9 cao h\u01a1n. Lu\u00f4n x\u00e1c nh\u1eadn k\u00edch th\u01b0\u1edbc, ren, \u0111ai \u1ed1c, v\u00f2ng \u0111\u1ec7m, m\u00f4i tr\u01b0\u1eddng \u1ee9ng d\u1ee5ng v\u00e0 t\u00e0i li\u1ec7u ki\u1ec3m tra tr\u01b0\u1edbc khi \u0111\u1eb7t h\u00e0ng.<\/p>","protected":false},"excerpt":{"rendered":"

    Stainless steel bolt grades are often misunderstood in purchasing. Buyers may ask for \u201c304 stainless bolts\u201d or \u201c316 stainless bolts,\u201d but the actual fastener marking often appears as A2-70, A4-70, or A4-80. These markings tell two things: the stainless steel group and the mechanical property class. Both matter. What A2 and A4 Mean Stainless Steel […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[479],"tags":[504],"class_list":["post-6904","post","type-post","status-publish","format-standard","hentry","category-fastener-knowledge-library","tag-strength-grades-mechanical-properties"],"acf":[],"_links":{"self":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/posts\/6904","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/comments?post=6904"}],"version-history":[{"count":1,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/posts\/6904\/revisions"}],"predecessor-version":[{"id":6905,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/posts\/6904\/revisions\/6905"}],"wp:attachment":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/media?parent=6904"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/categories?post=6904"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/tags?post=6904"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}