{"id":1585,"date":"2026-01-23T00:34:05","date_gmt":"2026-01-22T17:34:05","guid":{"rendered":"https:\/\/inoxcuongthinh.com\/inox-304l-va-304h-la-gi-khac-gi-so-voi-inox-304-tieu-chuan\/"},"modified":"2026-01-23T00:34:05","modified_gmt":"2026-01-22T17:34:05","slug":"inox-304l-va-304h-la-gi-khac-gi-so-voi-inox-304-tieu-chuan","status":"publish","type":"post","link":"https:\/\/inoxcuongthinh.com\/inox-304l-va-304h-la-gi-khac-gi-so-voi-inox-304-tieu-chuan\/","title":{"rendered":"Inox 304L v\u00e0 304H l\u00e0 g\u00ec? Kh\u00e1c g\u00ec so v\u1edbi Inox 304 ti\u00eau chu\u1ea9n"},"content":{"rendered":"<div class=\"custom-toc\">\n<h3>N\u1ed9i dung ch\u00ednh<\/h3>\n<ul>\n<li><a href=\"#toc-0-khai-niem-nhanh-va-tieu-chuan-tuong-duong\">Kh\u00e1i ni\u1ec7m nhanh v\u00e0 ti\u00eau chu\u1ea9n t\u01b0\u01a1ng \u0111\u01b0\u01a1ng<\/a><\/li>\n<li><a href=\"#toc-1-diem-khac-biet-cot-loi-giua-304-304l-va-304h\">\u0110i\u1ec3m kh\u00e1c bi\u1ec7t c\u1ed1t l\u00f5i gi\u1eefa 304, 304L v\u00e0 304H<\/a><\/li>\n<li><a href=\"#toc-2-thong-so-co-tinh-dien-hinh-nhiet-do-phong\">Th\u00f4ng s\u1ed1 c\u01a1 t\u00ednh \u0111i\u1ec3n h\u00ecnh (nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng)<\/a><\/li>\n<li><a href=\"#toc-3-khi-nao-chon-304l-304h-hay-304\">Khi n\u00e0o ch\u1ecdn 304L, 304H hay 304?<\/a><\/li>\n<li><a href=\"#toc-4-han-vat-lieu-han-va-xu-ly-nhiet\">H\u00e0n, v\u1eadt li\u1ec7u h\u00e0n v\u00e0 x\u1eed l\u00fd nhi\u1ec7t<\/a><\/li>\n<li><a href=\"#toc-5-hieu-nang-an-mon-va-luu-y-moi-truong-viet-nam\">Hi\u1ec7u n\u0103ng \u0103n m\u00f2n v\u00e0 l\u01b0u \u00fd m\u00f4i tr\u01b0\u1eddng Vi\u1ec7t Nam<\/a><\/li>\n<li><a href=\"#toc-6-so-sanh-nhanh-theo-nhu-cau\">So s\u00e1nh nhanh theo nhu c\u1ea7u<\/a><\/li>\n<li><a href=\"#toc-7-tieu-chuan-ma-va-dinh-danh-can-biet\">Ti\u00eau chu\u1ea9n, m\u00e3 v\u00e0 \u0111\u1ecbnh danh c\u1ea7n bi\u1ebft<\/a><\/li>\n<li><a href=\"#toc-8-cau-hoi-thuong-gap\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/a><\/li>\n<li><a href=\"#toc-9-ket-luan\">K\u1ebft lu\u1eadn<\/a><\/li>\n<\/ul>\n<\/div>\n<p>Inox 304L v\u00e0 304H l\u00e0 hai bi\u1ebfn th\u1ec3 c\u1ee7a m\u00e1c inox 304 austenit r\u1ea5t ph\u1ed5 bi\u1ebfn trong c\u00f4ng nghi\u1ec7p. Kh\u00e1c bi\u1ec7t tr\u1ecdng y\u1ebfu n\u1eb1m \u1edf h\u00e0m l\u01b0\u1ee3ng Cacbon, k\u00e9o theo thay \u0111\u1ed5i v\u1ec1 kh\u1ea3 n\u0103ng h\u00e0n v\u00e0 \u0111\u1ed9 b\u1ec1n \u1edf nhi\u1ec7t \u0111\u1ed9 cao. B\u00e0i vi\u1ebft n\u00e0y ph\u00e2n t\u00edch \u0111\u1ea7y \u0111\u1ee7 kh\u00e1i ni\u1ec7m, ti\u00eau chu\u1ea9n, t\u00ednh ch\u1ea5t, v\u00e0 c\u00e1ch ch\u1ecdn 304L\/304H so v\u1edbi 304 th\u01b0\u1eddng, gi\u00fap k\u1ef9 s\u01b0 v\u00e0 ch\u1ee7 x\u01b0\u1edfng ra quy\u1ebft \u0111\u1ecbnh \u0111\u00fang v\u1eadt li\u1ec7u ngay t\u1eeb \u0111\u1ea7u d\u1ef1 \u00e1n.<\/p>\n<h2 id=\"toc-0-khai-niem-nhanh-va-tieu-chuan-tuong-duong\">Kh\u00e1i ni\u1ec7m nhanh v\u00e0 ti\u00eau chu\u1ea9n t\u01b0\u01a1ng \u0111\u01b0\u01a1ng<\/h2>\n<p>&#8211; Inox 304 (UNS S30400, EN 1.4301): m\u00e1c chu\u1ea9n, c\u00e2n b\u1eb1ng gi\u1eefa \u0111\u1ed9 b\u1ec1n \u2013 ch\u1ed1ng \u0103n m\u00f2n \u2013 gia c\u00f4ng.<br \/>\n&#8211; Inox 304L (UNS S30403, EN 1.4307): \u201cL\u201d = Low Carbon (C \u2264 0,03%), t\u1ed1i \u01b0u ch\u1ed1ng \u0103n m\u00f2n li\u00ean k\u1ebft h\u1ea1t sau h\u00e0n m\u00e0 kh\u00f4ng c\u1ea7n \u1ee7 sau h\u00e0n.<br \/>\n&#8211; Inox 304H (UNS S30409, EN 1.4948): \u201cH\u201d = High Carbon (th\u01b0\u1eddng 0,04\u20130,10% C), t\u0103ng \u0111\u1ed9 b\u1ec1n r\u00e3o\/\u0111\u1ed9 b\u1ec1n ph\u00e1 h\u1ee7y theo th\u1eddi gian \u1edf nhi\u1ec7t \u0111\u1ed9 cao.<\/p>\n<p>Ti\u00eau chu\u1ea9n s\u1ea3n ph\u1ea9m ph\u1ed5 bi\u1ebfn:<br \/>\n&#8211; T\u1ea5m\/cu\u1ed9n: ASTM A240\/A240M<br \/>\n&#8211; \u1ed0ng \u0111\u00fac\/h\u00e0n: ASTM A312\/A358; \u1ed0ng ch\u1ecbu nhi\u1ec7t: ASTM A213<br \/>\n&#8211; Thanh, tr\u00f2n \u0111\u1eb7c: ASTM A276\/A479<br \/>\n&#8211; R\u00e8n: ASTM A182<\/p>\n<h3>Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc \u0111i\u1ec3n h\u00ecnh (theo ASTM A240)<\/h3>\n<p>&#8211; Cr: 18,0\u201320,0%<br \/>\n&#8211; Ni: 8,0\u201311,0% (m\u1ed9t s\u1ed1 nh\u00e0 SX c\u00f3 th\u1ec3 t\u1edbi ~12\u201313%)<br \/>\n&#8211; Mn \u2264 2,0%; Si \u2264 1,0%; P \u2264 0,045%; S \u2264 0,030%; N \u2264 ~0,10%<br \/>\n&#8211; Cacbon:<br \/>\n  &#8211; 304: C \u2264 0,08%<br \/>\n  &#8211; 304L: C \u2264 0,03%<br \/>\n  &#8211; 304H: C trong kho\u1ea3ng cao h\u01a1n, t\u1ed1i thi\u1ec3u 0,04% (th\u01b0\u1eddng 0,04\u20130,10%)<\/p>\n<p>Ngu\u1ed3n tham kh\u1ea3o: ASTM A240; Atlas Steels Technical Handbook; ATI 304\/304L\/304H Data Sheet.<\/p>\n<h2 id=\"toc-1-diem-khac-biet-cot-loi-giua-304-304l-va-304h\">\u0110i\u1ec3m kh\u00e1c bi\u1ec7t c\u1ed1t l\u00f5i gi\u1eefa 304, 304L v\u00e0 304H<\/h2>\n<p>&#8211; H\u00e0m l\u01b0\u1ee3ng Cacbon v\u00e0 h\u1eadu qu\u1ea3 k\u1ef9 thu\u1eadt:<br \/>\n  &#8211; 304L: C th\u1ea5p h\u1ea1n ch\u1ebf t\u1ea1o Cr-carbide \u1edf v\u00f9ng \u1ea3nh h\u01b0\u1edfng nhi\u1ec7t khi h\u00e0n \u2192 gi\u1ea3m nh\u1ea1y c\u1ea3m \u0103n m\u00f2n li\u00ean k\u1ebft h\u1ea1t; c\u01a1 t\u00ednh t\u1ea1i nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng h\u01a1i th\u1ea5p h\u01a1n 304 m\u1ed9t ch\u00fat.<br \/>\n  &#8211; 304H: C cao t\u0103ng \u0111\u1ed9 b\u1ec1n r\u00e3o v\u00e0 \u1ee9ng x\u1eed l\u00e2u d\u00e0i \u1edf nhi\u1ec7t \u0111\u1ed9 cao (th\u01b0\u1eddng > 500\u2013550\u00b0C); nh\u01b0ng nh\u1ea1y c\u1ea3m \u0103n m\u00f2n li\u00ean k\u1ebft h\u1ea1t h\u01a1n n\u1ebfu h\u00e0n m\u00e0 kh\u00f4ng x\u1eed l\u00fd ph\u00f9 h\u1ee3p.<br \/>\n&#8211; Kh\u1ea3 n\u0103ng h\u00e0n:<br \/>\n  &#8211; 304L l\u00e0 l\u1ef1a ch\u1ecdn m\u1eb7c \u0111\u1ecbnh cho k\u1ebft c\u1ea5u h\u00e0n d\u00e0y, ph\u1ee9c t\u1ea1p, kh\u00f4ng \u1ee7 sau h\u00e0n.<br \/>\n  &#8211; 304\/304H h\u00e0n \u0111\u01b0\u1ee3c, nh\u01b0ng c\u1ea7n ki\u1ec3m so\u00e1t nhi\u1ec7t, ch\u1ecdn v\u1eadt li\u1ec7u h\u00e0n ph\u00f9 h\u1ee3p (308\/308H\/347), v\u00e0 c\u00e2n nh\u1eafc \u1ee7 h\u00f2a tan khi y\u00eau c\u1ea7u ch\u1ed1ng \u0103n m\u00f2n li\u00ean k\u1ebft h\u1ea1t kh\u1eaft khe.<br \/>\n&#8211; \u1ee8ng x\u1eed \u1edf nhi\u1ec7t \u0111\u1ed9 cao:<br \/>\n  &#8211; 304 ti\u00eau chu\u1ea9n d\u00f9ng t\u1ed1t t\u1edbi kho\u1ea3ng 870\u00b0C cho ti\u1ebfp x\u00fac gi\u00e1n \u0111o\u1ea1n (\u00f4xy h\u00f3a), nh\u01b0ng \u0111\u1ec3 ch\u1ecbu t\u1ea3i l\u00e2u d\u00e0i \u1edf nhi\u1ec7t \u0111\u1ed9 cao, 304H c\u00f3 gi\u00e1 tr\u1ecb \u1ee9ng su\u1ea5t cho ph\u00e9p cao h\u01a1n trong c\u00e1c m\u00e3 ASME.<br \/>\n  &#8211; 304L kh\u00f4ng khuy\u1ebfn ngh\u1ecb cho \u1ee9ng d\u1ee5ng ch\u1ecbu t\u1ea3i li\u00ean t\u1ee5c \u1edf nhi\u1ec7t \u0111\u1ed9 cao do \u0111\u1ed9 b\u1ec1n r\u00e3o th\u1ea5p h\u01a1n.<br \/>\n&#8211; Kh\u1ea3 n\u0103ng ch\u1ed1ng \u0103n m\u00f2n t\u1ed5ng qu\u00e1t:<br \/>\n  &#8211; 304\/304L\/304H t\u01b0\u01a1ng \u0111\u01b0\u01a1ng trong m\u00f4i tr\u01b0\u1eddng trung t\u00ednh\/nh\u1eb9; PREN t\u01b0\u01a1ng t\u1ef1 (~18, kh\u00f4ng c\u00f3 Mo).<br \/>\n  &#8211; Trong m\u00f4i tr\u01b0\u1eddng clorua (ven bi\u1ec3n, h\u00f3a ch\u1ea5t ch\u1ee9a Cl-), nguy c\u01a1 r\u1ed7\/khe v\u00e0 SCC t\u0103ng, \u0111\u1eb7c bi\u1ec7t khi > 60\u00b0C. Khi \u0111\u00f3 n\u00ean c\u00e2n nh\u1eafc 316\/316L.<br \/>\n&#8211; C\u1ea5p ch\u1ee9ng ch\u1ec9 v\u00e0 thi\u1ebft k\u1ebf theo m\u00e3:<br \/>\n  &#8211; 304H th\u01b0\u1eddng \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh khi c\u1ea7n allowable stress theo ASME \u1edf nhi\u1ec7t \u0111\u1ed9 cao. 304L \u01b0u ti\u00ean trong b\u00ecnh b\u1ed3n h\u00e0n kh\u00f4ng \u1ee7.<\/p>\n<p>Ngu\u1ed3n tham kh\u1ea3o: ASME BPVC Section II (allowable stresses); ASSDA; Outokumpu Stainless Steel Handbook.<\/p>\n<h2 id=\"toc-2-thong-so-co-tinh-dien-hinh-nhiet-do-phong\">Th\u00f4ng s\u1ed1 c\u01a1 t\u00ednh \u0111i\u1ec3n h\u00ecnh (nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng)<\/h2>\n<p>&#8211; Gi\u1edbi h\u1ea1n ch\u1ea3y Rp0.2: \u2248 205 MPa (304\/304L\/304H)<br \/>\n&#8211; \u0110\u1ed9 b\u1ec1n k\u00e9o: \u2248 515\u2013620 MPa<br \/>\n&#8211; \u0110\u1ed9 gi\u00e3n d\u00e0i: \u2248 40% (A50)<br \/>\n&#8211; \u0110\u1ed9 c\u1ee9ng: \u2264 ~201 HB<br \/>\nL\u01b0u \u00fd: 304L c\u00f3 xu h\u01b0\u1edbng gi\u1edbi h\u1ea1n b\u1ec1n\/\u0111\u1ed9 c\u1ee9ng th\u1ea5p h\u01a1n ch\u00fat so v\u1edbi 304 do C th\u1ea5p; kh\u00e1c bi\u1ec7t nh\u1ecf trong th\u1ef1c t\u1ebf gia c\u00f4ng ngu\u1ed9i.<\/p>\n<p>Ngu\u1ed3n tham kh\u1ea3o: ASTM A240; ATI\/AK Steel 304\/304L\/304H datasheets; Atlas Steels.<\/p>\n<h2 id=\"toc-3-khi-nao-chon-304l-304h-hay-304\">Khi n\u00e0o ch\u1ecdn 304L, 304H hay 304?<\/h2>\n<p>&#8211; Ch\u1ecdn 304L n\u1ebfu:<br \/>\n  &#8211; K\u1ebft c\u1ea5u c\u00f3 nhi\u1ec1u m\u1ed1i h\u00e0n, chi\u1ec1u d\u00e0y l\u1edbn, kh\u00f4ng th\u1ec3 \u1ee7 sau h\u00e0n.<br \/>\n  &#8211; B\u1ed3n ch\u1ee9a, \u0111\u01b0\u1eddng \u1ed1ng n\u01b0\u1edbc s\u1ea1ch, th\u1ef1c ph\u1ea9m, d\u01b0\u1ee3c, thi\u1ebft b\u1ecb c\u00f4ng nghi\u1ec7p nhi\u1ec7t \u0111\u1ed9 th\u01b0\u1eddng \u0111\u1ebfn ~400\u00b0C.<br \/>\n  &#8211; Y\u00eau c\u1ea7u ch\u1ed1ng \u0103n m\u00f2n li\u00ean k\u1ebft h\u1ea1t nghi\u00eam ng\u1eb7t sau h\u00e0n.<br \/>\n&#8211; Ch\u1ecdn 304H n\u1ebfu:<br \/>\n  &#8211; D\u1ecbch v\u1ee5 t\u1ea3i tr\u1ecdng \u1edf nhi\u1ec7t \u0111\u1ed9 cao (kho\u1ea3ng 500\u2013800\u00b0C), c\u1ea7n \u0111\u1ed9 b\u1ec1n r\u00e3o\/\u1ee9ng su\u1ea5t cho ph\u00e9p cao h\u01a1n.<br \/>\n  &#8211; B\u1ed9 ph\u1eadn l\u00f2, n\u1ed3i h\u01a1i, \u1ed1ng sinh h\u01a1i, b\u1ed9 qu\u00e1 nhi\u1ec7t, \u1ed1ng g\u00f3p, trao \u0111\u1ed5i nhi\u1ec7t nhi\u1ec7t \u0111\u1ed9 cao.<br \/>\n&#8211; D\u00f9ng 304 ti\u00eau chu\u1ea9n n\u1ebfu:<br \/>\n  &#8211; \u1ee8ng d\u1ee5ng chung, \u00edt m\u1ed1i h\u00e0n ph\u1ee9c t\u1ea1p, kh\u00f4ng l\u00e0m vi\u1ec7c \u1edf nhi\u1ec7t \u0111\u1ed9 cao k\u00e9o d\u00e0i.<br \/>\n&#8211; C\u00e2n nh\u1eafc 316\/316L n\u1ebfu:<br \/>\n  &#8211; M\u00f4i tr\u01b0\u1eddng c\u00f3 clorua (ven bi\u1ec3n, n\u01b0\u1edbc m\u1eb7n, h\u00f3a ch\u1ea5t Cl-) ho\u1eb7c nhi\u1ec7t \u0111\u1ed9 d\u1ecbch > 60\u00b0C c\u00f3 clorua.<\/p>\n<h2 id=\"toc-4-han-vat-lieu-han-va-xu-ly-nhiet\">H\u00e0n, v\u1eadt li\u1ec7u h\u00e0n v\u00e0 x\u1eed l\u00fd nhi\u1ec7t<\/h2>\n<p>&#8211; V\u1eadt li\u1ec7u h\u00e0n g\u1ee3i \u00fd:<br \/>\n  &#8211; 304\/304L: ER308L\/E308L (h\u00e0n h\u1ed3 quang\/\u0111i\u1ec7n c\u1ef1c que 308L) \u0111\u1ec3 ki\u1ec3m so\u00e1t C th\u1ea5p trong m\u1ed1i h\u00e0n.<br \/>\n  &#8211; 304H: ER308H\/E308H; trong m\u1ed9t s\u1ed1 tr\u01b0\u1eddng h\u1ee3p nhi\u1ec7t \u0111\u1ed9 cao v\u00e0 ch\u1ed1ng nh\u1ea1y c\u1ea3m, c\u00e2n nh\u1eafc ER347 (Niobium \u1ed5n \u0111\u1ecbnh carbide).<br \/>\n&#8211; Quy t\u1eafc c\u01a1 b\u1ea3n:<br \/>\n  &#8211; Gi\u1ea3m nhi\u1ec7t \u0111\u01b0a v\u00e0o, h\u1ea1n ch\u1ebf th\u1eddi gian trong v\u00f9ng 425\u2013870\u00b0C (v\u00f9ng nh\u1ea1y c\u1ea3m).<br \/>\n  &#8211; 304L cho ph\u00e9p b\u1ecf qua \u1ee7 sau h\u00e0n ph\u1ea7n l\u1edbn tr\u01b0\u1eddng h\u1ee3p. 304\/304H c\u00f3 th\u1ec3 c\u1ea7n \u1ee7 h\u00f2a tan 1010\u20131065\u00b0C r\u1ed3i l\u00e0m ngu\u1ed9i nhanh n\u1ebfu ti\u00eau chu\u1ea9n ch\u1ed1ng \u0103n m\u00f2n li\u00ean k\u1ebft h\u1ea1t kh\u1eaft khe.<br \/>\n&#8211; Gia c\u00f4ng ngu\u1ed9i v\u00e0 h\u00f3a b\u1ec1n:<br \/>\n  &#8211; Kh\u00f4ng th\u1ec3 t\u00f4i c\u1ee9ng b\u1eb1ng nhi\u1ec7t; ch\u1ec9 t\u0103ng b\u1ec1n b\u1eb1ng bi\u1ebfn d\u1ea1ng ngu\u1ed9i.<br \/>\n&#8211; Gia c\u00f4ng c\u1eaft g\u1ecdt:<br \/>\n  &#8211; D\u00f9ng dao h\u1ee3p kim ph\u00f9 h\u1ee3p, t\u1ed1c \u0111\u1ed9 c\u1eaft trung b\u00ecnh-th\u1ea5p, t\u01b0\u1edbi ngu\u1ed9i t\u1ed1t \u0111\u1ec3 h\u1ea1n ch\u1ebf k\u1eb9t d\u00ednh.<\/p>\n<p>Ngu\u1ed3n tham kh\u1ea3o: ASSDA Fabrication Guidelines; Atlas Steels; Outokumpu welding recommendations.<\/p>\n<h2 id=\"toc-5-hieu-nang-an-mon-va-luu-y-moi-truong-viet-nam\">Hi\u1ec7u n\u0103ng \u0103n m\u00f2n v\u00e0 l\u01b0u \u00fd m\u00f4i tr\u01b0\u1eddng Vi\u1ec7t Nam<\/h2>\n<p>&#8211; N\u01b0\u1edbc m\u00e1y\/n\u01b0\u1edbc s\u1ea1ch: 304\/304L \u0111\u00e1p \u1ee9ng t\u1ed1t; tr\u00e1nh k\u1ebd h\u1edf, thi\u1ebft k\u1ebf tho\u00e1t n\u01b0\u1edbc \u0111\u1ec3 h\u1ea1n ch\u1ebf \u0103n m\u00f2n k\u1ebd.<br \/>\n&#8211; Ven bi\u1ec3n\/\u1ea9m m\u1eb7n: S\u01b0\u01a1ng mu\u1ed1i, gi\u00f3 bi\u1ec3n l\u00e0m t\u0103ng r\u1ed7; n\u1ebfu b\u1eaft bu\u1ed9c d\u00f9ng 304\/304L, ch\u1ecdn b\u1ec1 m\u1eb7t \u0111\u00e1nh b\u00f3ng t\u1ed1t (No.4\/BA), r\u1eeda \u0111\u1ecbnh k\u1ef3. L\u00fd t\u01b0\u1edfng l\u00e0 316\/316L.<br \/>\n&#8211; H\u00f3a ch\u1ea5t: Tr\u00e1nh m\u00f4i tr\u01b0\u1eddng ch\u1ee9a Cl- \u0111\u1eadm \u0111\u1eb7c, axit m\u1ea1nh (HCl); 304 kh\u00f4ng ph\u00f9 h\u1ee3p.<br \/>\n&#8211; Nhi\u1ec7t \u0111\u1ed9 cao c\u00f3 t\u1ea3i: \u01afu ti\u00ean 304H; ki\u1ec3m tra \u1ee9ng su\u1ea5t cho ph\u00e9p theo ASME cho nhi\u1ec7t \u0111\u1ed9 l\u00e0m vi\u1ec7c th\u1ef1c t\u1ebf.<\/p>\n<h2 id=\"toc-6-so-sanh-nhanh-theo-nhu-cau\">So s\u00e1nh nhanh theo nhu c\u1ea7u<\/h2>\n<p>&#8211; \u01afu ti\u00ean h\u00e0n, kh\u00f4ng \u1ee7 sau h\u00e0n \u2192 304L.<br \/>\n&#8211; \u01afu ti\u00ean ch\u1ecbu t\u1ea3i \u1edf nhi\u1ec7t \u0111\u1ed9 cao \u2192 304H.<br \/>\n&#8211; \u1ee8ng d\u1ee5ng chung, chi ph\u00ed t\u1ed1i \u01b0u \u2192 304.<br \/>\n&#8211; M\u00f4i tr\u01b0\u1eddng clorua cao \u2192 c\u00e2n nh\u1eafc 316\/316L.<\/p>\n<h2 id=\"toc-7-tieu-chuan-ma-va-dinh-danh-can-biet\">Ti\u00eau chu\u1ea9n, m\u00e3 v\u00e0 \u0111\u1ecbnh danh c\u1ea7n bi\u1ebft<\/h2>\n<p>&#8211; UNS: S30400 (304), S30403 (304L), S30409 (304H)<br \/>\n&#8211; EN: 1.4301 (304), 1.4307 (304L), 1.4948 (304H)<br \/>\n&#8211; ASTM s\u1ea3n ph\u1ea9m: A240 (t\u1ea5m\/cu\u1ed9n), A312\/A213 (\u1ed1ng), A276\/A479 (thanh), A182 (r\u00e8n)<br \/>\n&#8211; M\u00e3 ASME: ki\u1ec3m tra Section II, Part D cho allowable stresses; Section VIII v\u00e0 B31.3 khi thi\u1ebft k\u1ebf b\u00ecnh b\u1ed3n\/\u0111\u01b0\u1eddng \u1ed1ng.<\/p>\n<p>Ngu\u1ed3n tham kh\u1ea3o ti\u00eau bi\u1ec3u:<br \/>\n&#8211; ASTM A240\/A312\/A276: https:\/\/www.astm.org<br \/>\n&#8211; ASME BPVC Section II, VIII; B31.3: https:\/\/www.asme.org<br \/>\n&#8211; Atlas Steels Technical Handbook: https:\/\/www.atlassteels.com.au<br \/>\n&#8211; ATI 304\/304L\/304H Data Sheet: https:\/\/www.atimetals.com<br \/>\n&#8211; Outokumpu Stainless Steel Handbook: https:\/\/www.outokumpu.com\/handbook<br \/>\n&#8211; ASSDA Technical Resources: https:\/\/www.assda.asn.au<\/p>\n<h2 id=\"toc-8-cau-hoi-thuong-gap\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<p>&#8211; 304L c\u00f3 k\u00e9m b\u1ec1n h\u01a1n 304 kh\u00f4ng?<br \/>\n  &#8211; Ch\u00eanh l\u1ec7ch nh\u1ecf \u1edf nhi\u1ec7t \u0111\u1ed9 ph\u00f2ng; 304L th\u01b0\u1eddng c\u00f3 gi\u1edbi h\u1ea1n b\u1ec1n th\u1ea5p h\u01a1n ch\u00fat do C th\u1ea5p, nh\u01b0ng \u0111\u1ee7 cho ph\u1ea7n l\u1edbn k\u1ebft c\u1ea5u.<br \/>\n&#8211; D\u00f9ng 304H cho chi ti\u1ebft h\u00e0n c\u00f3 \u1ed5n kh\u00f4ng?<br \/>\n  &#8211; H\u00e0n \u0111\u01b0\u1ee3c, nh\u01b0ng c\u1ea7n v\u1eadt li\u1ec7u h\u00e0n ph\u00f9 h\u1ee3p, ki\u1ec3m so\u00e1t nhi\u1ec7t \u0111\u1ea7u v\u00e0o, v\u00e0 c\u00f3 th\u1ec3 ph\u1ea3i \u1ee7 h\u00f2a tan n\u1ebfu y\u00eau c\u1ea7u ch\u1ed1ng \u0103n m\u00f2n li\u00ean k\u1ebft h\u1ea1t cao. N\u1ebfu nhi\u1ec1u m\u1ed1i h\u00e0n, \u01b0u ti\u00ean 304L tr\u1eeb khi \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t \u0111\u1ed9 bu\u1ed9c ph\u1ea3i d\u00f9ng 304H.<br \/>\n&#8211; 304L c\u00f3 d\u00f9ng t\u1ed1t tr\u00ean 500\u00b0C?<br \/>\n  &#8211; C\u00f3 th\u1ec3 ch\u1ecbu \u00f4xy h\u00f3a, nh\u01b0ng cho chi ti\u1ebft ch\u1ecbu t\u1ea3i li\u00ean t\u1ee5c\/\u0111\u01b0\u1eddng \u1ed1ng \u00e1p l\u1ef1c, 304H \u0111\u01b0\u1ee3c \u01b0u ti\u00ean v\u00ec c\u00f3 \u1ee9ng su\u1ea5t cho ph\u00e9p\/\u0111\u1ed9 b\u1ec1n r\u00e3o t\u1ed1t h\u01a1n theo ASME.<\/p>\n<h2 id=\"toc-9-ket-luan\">K\u1ebft lu\u1eadn<\/h2>\n<p>&#8211; 304L l\u00e0 bi\u1ebfn th\u1ec3 C th\u1ea5p c\u1ee7a 304, t\u1ed1i \u01b0u sau h\u00e0n nh\u1edd ch\u1ed1ng \u0103n m\u00f2n li\u00ean k\u1ebft h\u1ea1t t\u1ed1t; ph\u00f9 h\u1ee3p b\u1ed3n b\u1ec3, \u0111\u01b0\u1eddng \u1ed1ng, thi\u1ebft b\u1ecb th\u1ef1c ph\u1ea9m \u2013 d\u01b0\u1ee3c v\u00e0 d\u1ecbch v\u1ee5 \u0111\u1ebfn kho\u1ea3ng 400\u00b0C.<br \/>\n&#8211; 304H l\u00e0 bi\u1ebfn th\u1ec3 C cao, ph\u00e1t huy khi l\u00e0m vi\u1ec7c c\u00f3 t\u1ea3i \u1edf nhi\u1ec7t \u0111\u1ed9 cao (kho\u1ea3ng 500\u2013800\u00b0C) v\u1edbi \u0111\u1ed9 b\u1ec1n r\u00e3o v\u01b0\u1ee3t tr\u1ed9i; th\u01b0\u1eddng \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh theo c\u00e1c m\u00e3 ASME.<br \/>\n&#8211; 304 ti\u00eau chu\u1ea9n c\u00e2n b\u1eb1ng cho \u1ee9ng d\u1ee5ng chung. Khi m\u00f4i tr\u01b0\u1eddng c\u00f3 clorua ho\u1eb7c nhi\u1ec7t \u0111\u1ed9 cao, c\u1ea7n c\u00e2n nh\u1eafc chuy\u1ec3n m\u00e1c (316\/316L ho\u1eb7c 304H) t\u01b0\u01a1ng \u1ee9ng.<\/p>\n<p>B\u1ea1n c\u1ea7n t\u01b0 v\u1ea5n ch\u1ecdn m\u00e1c, \u0111\u1ed9 d\u00e0y, ti\u00eau chu\u1ea9n \u1ed1ng\/t\u1ea5m v\u00e0 ch\u1ee9ng ch\u1ec9 nhi\u1ec7t? Li\u00ean h\u1ec7 Inox C\u01b0\u1eddng Th\u1ecbnh \u0111\u1ec3 \u0111\u01b0\u1ee3c \u0111\u1ec1 xu\u1ea5t k\u1ef9 thu\u1eadt t\u1ed1i \u01b0u v\u00e0 b\u00e1o gi\u00e1 t\u1ed1t nh\u1ea5t.<br \/>\nContact Inox Cuong Thinh for more advice and the best price. Hotline: 0343.417.281. Email: inoxcongnghiep.cuongthinh@gmail.com<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Gi\u1ea3i th\u00edch r\u00f5 304L v\u00e0 304H: th\u00e0nh ph\u1ea7n, c\u01a1 t\u00ednh, h\u00e0n v\u00e0 ch\u1ecbu nhi\u1ec7t; so s\u00e1nh chi ti\u1ebft v\u1edbi 304 ti\u00eau chu\u1ea9n, ti\u00eau chu\u1ea9n ASTM\/EN v\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf.<\/p>\n","protected":false},"author":7,"featured_media":1063,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[23],"tags":[],"class_list":["post-1585","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc"],"acf":[],"_links":{"self":[{"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/posts\/1585","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/comments?post=1585"}],"version-history":[{"count":0,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/posts\/1585\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/media\/1063"}],"wp:attachment":[{"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/media?parent=1585"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/categories?post=1585"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/tags?post=1585"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}