{"id":6727,"date":"2023-12-21T11:53:42","date_gmt":"2023-12-21T03:53:42","guid":{"rendered":"https:\/\/xzfastener.com\/?p=6727"},"modified":"2026-06-22T11:55:26","modified_gmt":"2026-06-22T03:55:26","slug":"a2-vs-a4-fasteners-how-to-choose-for-corrosion-resistance","status":"publish","type":"post","link":"https:\/\/xzfastener.com\/vi\/a2-vs-a4-fasteners-how-to-choose-for-corrosion-resistance\/","title":{"rendered":"Ch\u1ed1t A2 v\u00e0 A4: C\u00e1ch ch\u1ecdn kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n"},"content":{"rendered":"<p>\u1ed0c v\u00edt A2 v\u00e0 A4 \u0111\u1ec1u l\u00e0 \u1ed1c v\u00edt b\u1eb1ng th\u00e9p kh\u00f4ng g\u1ec9, nh\u01b0ng ch\u00fang kh\u00f4ng \u0111\u01b0\u1ee3c ch\u1ecdn cho c\u00f9ng m\u1ed9t m\u00f4i tr\u01b0\u1eddng. S\u1ef1 kh\u00e1c bi\u1ec7t ch\u00ednh l\u00e0 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n.<\/p>\n\n\n\n<p>Theo thu\u1eadt ng\u1eef c\u1ee7a ng\u01b0\u1eddi mua, A2 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c \u1ee9ng d\u1ee5ng kh\u00f4ng g\u1ec9 n\u00f3i chung. A4 \u0111\u01b0\u1ee3c ch\u1ecdn khi ti\u1ebfp x\u00fac v\u1edbi clorua, kh\u00f4ng kh\u00ed ven bi\u1ec3n ho\u1eb7c ti\u1ebfp x\u00fac v\u1edbi h\u00f3a ch\u1ea5t tr\u1edf n\u00ean nghi\u00eam tr\u1ecdng h\u01a1n.<\/p>\n\n\n\n<p>L\u1ef1a ch\u1ecdn sai c\u00f3 th\u1ec3 kh\u00f4ng th\u00e0nh c\u00f4ng trong qu\u00e1 tr\u00ecnh c\u00e0i \u0111\u1eb7t. N\u00f3 th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n sau \u0111\u00f3 d\u01b0\u1edbi d\u1ea1ng v\u1ebft \u1ed1, r\u1ed7, s\u1ee3i ch\u1ec9 b\u1ecb k\u1eb9t ho\u1eb7c khi\u1ebfu n\u1ea1i c\u1ee7a kh\u00e1ch h\u00e0ng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00dd ngh\u0129a c\u1ee7a A2 v\u00e0 A4<\/h2>\n\n\n\n<p>Theo ISO 3506, A2 v\u00e0 A4 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn c\u00e1c nh\u00f3m chi ti\u1ebft si\u1ebft ch\u1eb7t b\u1eb1ng th\u00e9p kh\u00f4ng g\u1ec9 austenit. Ng\u01b0\u1eddi mua th\u01b0\u1eddng so s\u00e1nh ch\u00fang v\u1edbi th\u00e9p kh\u00f4ng g\u1ec9 lo\u1ea1i 304 v\u00e0 lo\u1ea1i 316.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>L\u1edbp<\/th><th>T\u00e0i li\u1ec7u tham kh\u1ea3o chung<\/th><th>T\u00ednh n\u0103ng ch\u00ednh<\/th><th>S\u1eed d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/th><\/tr><\/thead><tbody><tr><td>A2<\/td><td>304 lo\u1ea1i kh\u00f4ng g\u1ec9<\/td><td>Ch\u1ed1ng \u0103n m\u00f2n chung<\/td><td>Trong nh\u00e0, m\u00e1y m\u00f3c, s\u1eed d\u1ee5ng ngo\u00e0i tr\u1eddi s\u1ea1ch s\u1ebd<\/td><\/tr><tr><td>A4<\/td><td>316 lo\u1ea1i kh\u00f4ng g\u1ec9<\/td><td>Kh\u00e1ng clorua t\u1ed1t h\u01a1n<\/td><td>C\u00e1c v\u00f9ng bi\u1ec3n, ven bi\u1ec3n, h\u00f3a ch\u1ea5t, \u1ea9m \u01b0\u1edbt<\/td><\/tr><tr><td>A2-70<\/td><td>A2 v\u1edbi l\u1edbp 700 MPa<\/td><td>L\u1edbp c\u01b0\u1eddng \u0111\u1ed9 kh\u00f4ng g\u1ec9 ph\u1ed5 bi\u1ebfn<\/td><td>L\u1eafp r\u00e1p c\u00f4ng nghi\u1ec7p t\u1ed5ng h\u1ee3p<\/td><\/tr><tr><td>A4-80<\/td><td>A4 v\u1edbi l\u1edbp c\u01b0\u1eddng \u0111\u1ed9 cao h\u01a1n<\/td><td>\u0102n m\u00f2n t\u1ed1t h\u01a1n c\u1ed9ng v\u1edbi s\u1ee9c m\u1ea1nh cao h\u01a1n<\/td><td>\u1ee8ng d\u1ee5ng \u0111\u00f2i h\u1ecfi kh\u1eaft khe h\u01a1n<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Ng\u01b0\u1eddi mua c\u00f3 th\u1ec3 xem x\u00e9t <a href=\"https:\/\/xzfastener.com\/vi\/fastener-material\/stainless-steel\/\">\u1ed1c v\u00edt b\u1eb1ng th\u00e9p kh\u00f4ng g\u1ec9<\/a> khi so s\u00e1nh c\u00e1c ph\u01b0\u01a1ng \u00e1n A2 v\u00e0 A4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Khi n\u00e0o n\u00ean ch\u1ecdn \u1ed1c v\u00edt A2<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">S\u1eed d\u1ee5ng c\u00f4ng nghi\u1ec7p chung<\/h3>\n\n\n\n<p>\u1ed0c v\u00edt A2 ph\u00f9 h\u1ee3p v\u1edbi nhi\u1ec1u m\u00f4i tr\u01b0\u1eddng b\u00ecnh th\u01b0\u1eddng.<\/p>\n\n\n\n<p>S\u1eed d\u1ee5ng A2 cho:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>M\u00e1y m\u00f3c trong nh\u00e0<\/li>\n\n\n\n<li>T\u1ee7 \u0111i\u1ec7n<\/li>\n\n\n\n<li>Ph\u1ea7n c\u1ee9ng n\u1ed9i th\u1ea5t<\/li>\n\n\n\n<li>Thi\u1ebft b\u1ecb th\u1ef1c ph\u1ea9m c\u00f3 m\u1ee9c \u0111\u1ed9 ti\u1ebfp x\u00fac nh\u1eb9<\/li>\n\n\n\n<li>L\u00e0m s\u1ea1ch c\u00e1c c\u00f4ng tr\u00ecnh ngo\u00e0i tr\u1eddi<\/li>\n\n\n\n<li>Gi\u00e1 \u0111\u1ee1 v\u00e0 v\u1ecf b\u1ecdc chung<\/li>\n<\/ul>\n\n\n\n<p>A2 th\u01b0\u1eddng d\u1ec5 t\u00ecm ngu\u1ed3n h\u01a1n v\u00e0 ti\u1ebft ki\u1ec7m chi ph\u00ed h\u01a1n A4. \u0110\u1ed1i v\u1edbi k\u00edch th\u01b0\u1edbc ti\u00eau chu\u1ea9n, ng\u01b0\u1eddi mua c\u0169ng c\u00f3 th\u1ec3 ki\u1ec3m tra <a href=\"https:\/\/xzfastener.com\/vi\/products-category\/standard-fasteners\/\">\u1ed1c v\u00edt ti\u00eau chu\u1ea9n<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Khi n\u00e0o n\u00ean ch\u1ecdn \u1ed1c v\u00edt A4<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Ti\u1ebfp x\u00fac v\u1edbi clorua v\u00e0 kh\u1eafc nghi\u1ec7t<\/h3>\n\n\n\n<p>A4 l\u00e0 l\u1ef1a ch\u1ecdn t\u1ed1t h\u01a1n khi nguy c\u01a1 \u0103n m\u00f2n cao h\u01a1n.<\/p>\n\n\n\n<p>S\u1eed d\u1ee5ng A4 cho:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>C\u00f4ng tr\u00ecnh ven bi\u1ec3n<\/li>\n\n\n\n<li>Thi\u1ebft b\u1ecb h\u00e0ng h\u1ea3i<\/li>\n\n\n\n<li>Nh\u00e0 m\u00e1y h\u00f3a ch\u1ea5t<\/li>\n\n\n\n<li>M\u00f4i tr\u01b0\u1eddng \u1ea9m \u01b0\u1edbt ngo\u00e0i tr\u1eddi<\/li>\n\n\n\n<li>Thi\u1ebft b\u1ecb r\u1eeda tr\u00f4i<\/li>\n\n\n\n<li>Xung quanh h\u1ed3 b\u01a1i<\/li>\n\n\n\n<li>Khu v\u1ef1c ti\u1ebfp x\u00fac v\u1edbi mu\u1ed1i \u0111\u01b0\u1eddng<\/li>\n<\/ul>\n\n\n\n<p>A4 kh\u00f4ng tr\u00e1nh kh\u1ecfi s\u1ef1 \u0103n m\u00f2n nh\u01b0ng n\u00f3 cho kh\u1ea3 n\u0103ng ch\u1ed1ng ch\u1ecbu t\u1ed1t h\u01a1n A2 trong m\u00f4i tr\u01b0\u1eddng clorua.<\/p>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c d\u1ef1 \u00e1n c\u00f3 kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n l\u00e0 r\u1ea5t quan tr\u1ecdng, h\u00e3y so s\u00e1nh A4 v\u1edbi <a href=\"https:\/\/xzfastener.com\/vi\/products-category\/various-coated-fasteners\/\">\u1ed1c v\u00edt tr\u00e1ng kh\u00e1c nhau<\/a> tr\u01b0\u1edbc khi ph\u00ea duy\u1ec7t cu\u1ed1i c\u00f9ng.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn c\u1ee7a ng\u01b0\u1eddi mua<\/h2>\n\n\n\n<p>Tr\u00e1nh nh\u1eefng v\u1ea5n \u0111\u1ec1 sau:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>S\u1eed d\u1ee5ng A2 trong c\u00e1c d\u1ef1 \u00e1n bi\u1ec3n ho\u1eb7c ven bi\u1ec3n.<\/li>\n\n\n\n<li>Ch\u1ec9 ch\u1ecdn A4 theo t\u00ean m\u00e0 kh\u00f4ng ki\u1ec3m tra l\u1edbp s\u1ee9c m\u1ea1nh.<\/li>\n\n\n\n<li>Tr\u1ed9n bu l\u00f4ng A2 v\u1edbi \u0111ai \u1ed1c A4 trong c\u00e1c c\u1ee5m l\u1eafp r\u00e1p quan tr\u1ecdng.<\/li>\n\n\n\n<li>B\u1ecf qua hi\u1ec7n t\u01b0\u1ee3ng l\u00f5m ren trong qu\u00e1 tr\u00ecnh l\u1eafp \u0111\u1eb7t th\u00e9p kh\u00f4ng g\u1ec9.<\/li>\n\n\n\n<li>Kh\u00f4ng x\u00e1c nh\u1eadn li\u1ec7u A2-70, A4-70, hay A4-80 l\u00e0 c\u1ea7n thi\u1ebft.<\/li>\n\n\n\n<li>Ch\u1ecdn th\u00e9p kh\u00f4ng g\u1ec9 m\u00e0 kh\u00f4ng ki\u1ec3m tra kim lo\u1ea1i \u0111\u01b0\u1ee3c k\u1ebft n\u1ed1i.<\/li>\n<\/ul>\n\n\n\n<p>\u0110\u1ed1i v\u1edbi c\u00e1c c\u1ee5m l\u1eafp r\u00e1p b\u1eb1ng th\u00e9p kh\u00f4ng g\u1ec9 c\u00f3 t\u1ea3i tr\u1ecdng cao, h\u00e3y xem l\u1ea1i <a href=\"https:\/\/xzfastener.com\/vi\/products-category\/high-strength-fasteners\/\">\u1ed1c v\u00edt c\u01b0\u1eddng \u0111\u1ed9 cao<\/a> v\u00e0 x\u00e1c nh\u1eadn c\u00e1c y\u00eau c\u1ea7u c\u01a1 kh\u00ed.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">RFQ Danh s\u00e1ch ki\u1ec3m tra<\/h2>\n\n\n\n<p>Tr\u01b0\u1edbc khi \u0111\u1eb7t h\u00e0ng, cung c\u1ea5p:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>A2 or A4 grade<\/li>\n\n\n\n<li>L\u1edbp thu\u1ed9c t\u00ednh: 50, 70, ho\u1eb7c 80<\/li>\n\n\n\n<li>Lo\u1ea1i s\u1ea3n ph\u1ea9m: bu l\u00f4ng, \u0111ai \u1ed1c, v\u00f2ng \u0111\u1ec7m, v\u00edt, \u0111inh t\u00e1n<\/li>\n\n\n\n<li>K\u00edch th\u01b0\u1edbc, cao \u0111\u1ed9 v\u00e0 chi\u1ec1u d\u00e0i<\/li>\n\n\n\n<li>\u0110i\u1ec1u ki\u1ec7n b\u1ec1 m\u1eb7t ho\u1eb7c y\u00eau c\u1ea7u th\u1ee5 \u0111\u1ed9ng<\/li>\n\n\n\n<li>M\u00f4i tr\u01b0\u1eddng \u1ee9ng d\u1ee5ng<\/li>\n\n\n\n<li>C\u00e1c lo\u1ea1i h\u1ea1t v\u00e0 v\u00f2ng \u0111\u1ec7m ph\u00f9 h\u1ee3p<\/li>\n\n\n\n<li>C\u00e1c t\u00e0i li\u1ec7u ki\u1ec3m tra c\u1ea7n thi\u1ebft<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\">L\u1eddi khuy\u00ean cu\u1ed1i c\u00f9ng<\/h2>\n\n\n\n<p>Ch\u1ecdn A2 \u0111\u1ec3 bu\u1ed9c ch\u1eb7t b\u1eb1ng th\u00e9p kh\u00f4ng g\u1ec9 th\u00f4ng th\u01b0\u1eddng. Ch\u1ecdn A4 khi kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n quan tr\u1ecdng h\u01a1n, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong m\u00f4i tr\u01b0\u1eddng clorua, ven bi\u1ec3n, bi\u1ec3n v\u00e0 h\u00f3a h\u1ecdc.<\/p>\n\n\n\n<p>RFQ an to\u00e0n nh\u1ea5t x\u00e1c \u0111\u1ecbnh c\u1ea5p \u0111\u1ed9, c\u1ea5p \u0111\u1ed9 b\u1ec1n, k\u00edch th\u01b0\u1edbc, ren, c\u00e1c b\u1ed9 ph\u1eadn ph\u00f9 h\u1ee3p v\u00e0 m\u00f4i tr\u01b0\u1eddng l\u00e0m vi\u1ec7c tr\u01b0\u1edbc khi s\u1ea3n xu\u1ea5t.<\/p>","protected":false},"excerpt":{"rendered":"<p>A2 and A4 fasteners are both stainless steel fasteners, but they are not selected for the same environment. The main difference is corrosion resistance. In buyer terms, A2 is commonly used for general stainless applications. A4 is selected when chloride exposure, coastal air, or chemical contact becomes more serious. The wrong choice may not fail [&hellip;]<\/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":[500],"class_list":["post-6727","post","type-post","status-publish","format-standard","hentry","category-fastener-knowledge-library","tag-fastener-selection-guide"],"acf":[],"_links":{"self":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/posts\/6727","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=6727"}],"version-history":[{"count":1,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/posts\/6727\/revisions"}],"predecessor-version":[{"id":6728,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/posts\/6727\/revisions\/6728"}],"wp:attachment":[{"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/media?parent=6727"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/categories?post=6727"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xzfastener.com\/vi\/wp-json\/wp\/v2\/tags?post=6727"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}