{"id":2028,"date":"2026-05-17T12:33:49","date_gmt":"2026-05-17T05:33:49","guid":{"rendered":"https:\/\/inoxcuongthinh.com\/inox-duplex-la-gi-uu-diem-mac-thep-2205-2507-va-ung-dung\/"},"modified":"2026-05-17T12:33:49","modified_gmt":"2026-05-17T05:33:49","slug":"inox-duplex-la-gi-uu-diem-mac-thep-2205-2507-va-ung-dung","status":"publish","type":"post","link":"https:\/\/inoxcuongthinh.com\/inox-duplex-la-gi-uu-diem-mac-thep-2205-2507-va-ung-dung\/","title":{"rendered":"Inox Duplex l\u00e0 g\u00ec? \u01afu \u0111i\u1ec3m, m\u00e1c th\u00e9p 2205\/2507 v\u00e0 \u1ee9ng d\u1ee5ng"},"content":{"rendered":"<div class=\"custom-toc\">\n<h3>N\u1ed9i dung ch\u00ednh<\/h3>\n<ul>\n<li><a href=\"#toc-0-inox-duplex-la-gi-cau-truc-va-nguyen-ly\">Inox Duplex l\u00e0 g\u00ec? C\u1ea5u tr\u00fac v\u00e0 nguy\u00ean l\u00fd<\/a><\/li>\n<li><a href=\"#toc-1-cac-nhom-duplex-pho-bien-va-mac-thep-tieu-bieu\">C\u00e1c nh\u00f3m Duplex ph\u1ed5 bi\u1ebfn v\u00e0 m\u00e1c th\u00e9p ti\u00eau bi\u1ec3u<\/a><\/li>\n<li><a href=\"#toc-2-dac-tinh-co-ly-va-an-mon-vi-sao-duplex-manh\">\u0110\u1eb7c t\u00ednh c\u01a1 l\u00fd v\u00e0 \u0103n m\u00f2n: v\u00ec sao Duplex \u201cm\u1ea1nh\u201d?<\/a><\/li>\n<li><a href=\"#toc-3-so-sanh-nhanh-duplex-vs-304316430\">So s\u00e1nh nhanh: Duplex vs 304\/316\/430<\/a><\/li>\n<li><a href=\"#toc-4-ung-dung-tieu-bieu-tai-viet-nam\">\u1ee8ng d\u1ee5ng ti\u00eau bi\u1ec3u t\u1ea1i Vi\u1ec7t Nam<\/a><\/li>\n<li><a href=\"#toc-5-huong-dan-chon-mac-duplex-theo-moi-truong\">H\u01b0\u1edbng d\u1eabn ch\u1ecdn m\u00e1c Duplex theo m\u00f4i tr\u01b0\u1eddng<\/a><\/li>\n<li><a href=\"#toc-6-luu-y-ky-thuat-khi-han-lam-sach-va-bao-tri\">L\u01b0u \u00fd k\u1ef9 thu\u1eadt khi h\u00e0n, l\u00e0m s\u1ea1ch v\u00e0 b\u1ea3o tr\u00ec<\/a><\/li>\n<li><a href=\"#toc-7-tieu-chuan-dang-hang-va-ton-kho-dien-hinh\">Ti\u00eau chu\u1ea9n, d\u1ea1ng h\u00e0ng v\u00e0 t\u1ed3n kho \u0111i\u1ec3n h\u00ecnh<\/a><\/li>\n<li><a href=\"#toc-8-chi-phi-va-hieu-qua-vong-doi-lcc\">Chi ph\u00ed v\u00e0 hi\u1ec7u qu\u1ea3 v\u00f2ng \u0111\u1eddi (LCC)<\/a><\/li>\n<li><a href=\"#toc-9-cau-hoi-thuong-gap\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/a><\/li>\n<li><a href=\"#toc-10-nguon-tham-khao\">Ngu\u1ed3n tham kh\u1ea3o<\/a><\/li>\n<li><a href=\"#toc-11-ket-luan\">K\u1ebft lu\u1eadn<\/a><\/li>\n<\/ul>\n<\/div>\n<p>Inox Duplex l\u00e0 nh\u00f3m th\u00e9p kh\u00f4ng g\u1ec9 c\u00f3 t\u1ed5 ch\u1ee9c vi kim lo\u1ea1i hai pha (kho\u1ea3ng 50% austenite v\u00e0 50% ferrite) n\u00ean k\u1ebft h\u1ee3p \u0111\u01b0\u1ee3c \u01b0u \u0111i\u1ec3m c\u1ee7a c\u1ea3 hai \u201ch\u1ecd\u201d inox austenitic v\u00e0 ferritic. Nh\u1edd \u0111\u00f3, Duplex cho c\u01a1 t\u00ednh cao, ch\u1ed1ng \u0103n m\u00f2n khe\/r\u1ed7 clorua v\u01b0\u1ee3t tr\u1ed9i v\u00e0 ch\u1ecbu n\u1ee9t \u0103n m\u00f2n \u1ee9ng su\u1ea5t t\u1ed1t h\u01a1n 304\/316 \u2013 r\u1ea5t h\u1eefu \u00edch cho c\u00f4ng tr\u00ecnh ven bi\u1ec3n, d\u1ea7u kh\u00ed, x\u1eed l\u00fd n\u01b0\u1edbc, h\u00f3a ch\u1ea5t. B\u00e0i vi\u1ebft n\u00e0y gi\u1ea3i th\u00edch tr\u1ecdn v\u1eb9n kh\u00e1i ni\u1ec7m, c\u00e1c m\u00e1c th\u00e9p ph\u1ed5 bi\u1ebfn (2205\/2507\/lean duplex), so s\u00e1nh k\u1ef9 thu\u1eadt, h\u01b0\u1edbng d\u1eabn ch\u1ecdn v\u1eadt li\u1ec7u theo m\u00f4i tr\u01b0\u1eddng Vi\u1ec7t Nam, v\u00e0 l\u01b0u \u00fd h\u00e0n \u2013 gia c\u00f4ng \u0111\u1ec3 \u0111\u1ea1t tu\u1ed5i th\u1ecd t\u1ed1i \u01b0u.<\/p>\n<h2 id=\"toc-0-inox-duplex-la-gi-cau-truc-va-nguyen-ly\">Inox Duplex l\u00e0 g\u00ec? C\u1ea5u tr\u00fac v\u00e0 nguy\u00ean l\u00fd<\/h2>\n<p>&#8211; Kh\u00e1i ni\u1ec7m: Duplex stainless steel l\u00e0 th\u00e9p kh\u00f4ng g\u1ec9 c\u00f3 vi c\u1ea5u tr\u00fac hai pha \u0111\u1ed3ng th\u1eddi: austenite (m\u1eb7t kh\u1ed1i l\u1eadp ph\u01b0\u01a1ng t\u00e2m m\u1eb7t) v\u00e0 ferrite (l\u1eadp ph\u01b0\u01a1ng t\u00e2m kh\u1ed1i). T\u1ec9 l\u1ec7 c\u00e2n b\u1eb1ng th\u01b0\u1eddng 40\u201360% m\u1ed7i pha sau \u1ee7 dung d\u1ecbch v\u00e0 l\u00e0m ngu\u1ed9i nhanh.<br \/>\n&#8211; \u00dd ngh\u0129a c\u1ee7a hai pha:<br \/>\n  &#8211; Pha ferrite: t\u0103ng gi\u1edbi h\u1ea1n ch\u1ea3y, t\u0103ng c\u1ee9ng v\u1eefng, t\u0103ng ch\u1ed1ng n\u1ee9t \u0103n m\u00f2n \u1ee9ng su\u1ea5t do ion Cl-.<br \/>\n  &#8211; Pha austenite: gi\u1eef \u0111\u1ed9 dai va \u0111\u1eadp t\u1ed1t, d\u1ec5 h\u00e0n h\u01a1n ferritic thu\u1ea7n, ch\u1ed1ng \u0103n m\u00f2n t\u1ed5ng qu\u00e1t t\u1ed1t.<br \/>\n&#8211; Nguy\u00ean t\u1ed1 h\u1ee3p kim ch\u1ee7 \u0111\u1ea1o:<br \/>\n  &#8211; Cr cao (\u224821\u201326%) t\u1ea1o m\u00e0ng th\u1ee5 \u0111\u1ed9ng b\u1ec1n; Mo (\u22480.3\u20134%) t\u0103ng ch\u1ed1ng r\u1ed7\/khe; N (\u22480.1\u20130.3%) v\u1eeba \u1ed5n \u0111\u1ecbnh austenite v\u1eeba t\u0103ng ch\u1ed1ng r\u1ed7 v\u00e0 b\u1ec1n ch\u1ea3y.<br \/>\n&#8211; C\u00f4ng ngh\u1ec7 nhi\u1ec7t luy\u1ec7n: \u1ee6 dung d\u1ecbch kho\u1ea3ng 1020\u20131100\u00b0C v\u00e0 l\u00e0m ngu\u1ed9i nhanh \u0111\u1ec3 tr\u00e1nh pha sigma; ki\u1ec3m so\u00e1t c\u00e2n b\u1eb1ng austenite\/ferrite l\u00e0 ch\u00eca kh\u00f3a hi\u1ec7u n\u0103ng.<\/p>\n<h2 id=\"toc-1-cac-nhom-duplex-pho-bien-va-mac-thep-tieu-bieu\">C\u00e1c nh\u00f3m Duplex ph\u1ed5 bi\u1ebfn v\u00e0 m\u00e1c th\u00e9p ti\u00eau bi\u1ec3u<\/h2>\n<p>&#8211; Lean Duplex (ti\u1ebft ki\u1ec7m Mo):<br \/>\n  &#8211; UNS S32101 (EN 1.4162), UNS S32304 (EN 1.4362).<br \/>\n  &#8211; Cr ~21\u201323%, r\u1ea5t \u00edt ho\u1eb7c kh\u00f4ng c\u00f3 Mo, N t\u0103ng; PREN th\u01b0\u1eddng 24\u201328, thay th\u1ebf 304\/316 trong n\u01b0\u1edbc ng\u1ecdt, n\u01b0\u1edbc c\u00f4ng nghi\u1ec7p \u00edt Cl- nh\u01b0ng c\u1ea7n b\u1ec1n ch\u1ea3y cao.<br \/>\n&#8211; Duplex ti\u00eau chu\u1ea9n:<br \/>\n  &#8211; 2205: UNS S32205\/S31803, EN 1.4462. Th\u00e0nh ph\u1ea7n \u0111i\u1ec3n h\u00ecnh: 22%Cr, 3%Mo, 0.14\u20130.20%N. PREN \u2248 34\u201336.<br \/>\n  &#8211; L\u00e0 \u201cworkhorse\u201d c\u1ee7a h\u1ecd Duplex, c\u00e2n b\u1eb1ng gi\u1eefa c\u01a1 t\u00ednh, ch\u1ed1ng r\u1ed7 v\u00e0 chi ph\u00ed.<br \/>\n&#8211; Super Duplex:<br \/>\n  &#8211; 2507: UNS S32750 (EN 1.4410), v\u00e0 UNS S32760. Cr ~25%, Mo ~3.5\u20134%, N ~0.25\u20130.3. PREN \u2248 41\u201345.<br \/>\n  &#8211; D\u00f9ng cho n\u01b0\u1edbc bi\u1ec3n, d\u1ea7u kh\u00ed, n\u01b0\u1edbc mu\u1ed1i \u0111\u1eadm \u0111\u1eb7c, nhi\u1ec7t \u0111\u1ed9 cao h\u01a1n trong m\u00f4i tr\u01b0\u1eddng clorua.<\/p>\n<p>Ghi ch\u00fa PREN (Pitting Resistance Equivalent Number) \u01b0\u1edbc t\u00ednh: PREN = %Cr + 3.3\u00d7%Mo + 16\u00d7%N. PREN c\u00e0ng cao, kh\u1ea3 n\u0103ng ch\u1ed1ng r\u1ed7\/khe c\u00e0ng t\u1ed1t.<\/p>\n<h2 id=\"toc-2-dac-tinh-co-ly-va-an-mon-vi-sao-duplex-manh\">\u0110\u1eb7c t\u00ednh c\u01a1 l\u00fd v\u00e0 \u0103n m\u00f2n: v\u00ec sao Duplex \u201cm\u1ea1nh\u201d?<\/h2>\n<h3>C\u01a1 t\u00ednh<\/h3>\n<p>&#8211; Gi\u1edbi h\u1ea1n ch\u1ea3y Rp0.2:<br \/>\n  &#8211; 2205: kho\u1ea3ng 450\u2013550 MPa (x\u1ea5p x\u1ec9 g\u1ea5p \u0111\u00f4i 304\/316 ~200\u2013240 MPa).<br \/>\n&#8211; \u0110\u1ed9 b\u1ec1n k\u00e9o Rm:<br \/>\n  &#8211; 2205: th\u01b0\u1eddng 620\u2013880 MPa.<br \/>\n&#8211; \u0110\u1ed9 gi\u00e3n d\u00e0i: th\u01b0\u1eddng 20\u201330%, v\u1eabn \u0111\u1ee7 d\u1ebbo dai cho gia c\u00f4ng t\u1ea1o h\u00ecnh h\u1ee3p l\u00fd.<br \/>\n&#8211; \u0110\u1ed9 dai va \u0111\u1eadp: cao h\u01a1n ferritic; ph\u00f9 h\u1ee3p -50\u00b0C t\u1edbi kho\u1ea3ng 250\u00b0C cho 2205 trong \u0111a s\u1ed1 \u1ee9ng d\u1ee5ng.<\/p>\n<h3>Ch\u1ed1ng \u0103n m\u00f2n<\/h3>\n<p>&#8211; \u0102n m\u00f2n t\u1ed5ng qu\u00e1t: t\u1ed1t h\u01a1n 304, x\u1ea5p x\u1ec9 ho\u1eb7c v\u01b0\u1ee3t 316L trong nhi\u1ec1u m\u00f4i tr\u01b0\u1eddng.<br \/>\n&#8211; R\u1ed7\/khe do Cl-: 2205 (PREN ~35) kh\u00e1ng r\u1ed7 t\u1ed1t h\u01a1n 316L (PREN ~24\u201326). Super duplex 2507 (PREN >40) d\u00f9ng cho n\u01b0\u1edbc bi\u1ec3n t\u1ef1 nhi\u00ean, b\u1ed1c h\u01a1i m\u1eb7n.<br \/>\n&#8211; N\u1ee9t \u0103n m\u00f2n \u1ee9ng su\u1ea5t (SCC) trong Cl- n\u00f3ng: Duplex kh\u00e1ng SCC t\u1ed1t h\u01a1n austenitic 304\/316, \u0111\u1eb7c bi\u1ec7t khi c\u00f3 t\u1ea3i k\u00e9o v\u00e0 nhi\u1ec7t \u0111\u1ed9 trung b\u00ecnh-cao.<br \/>\n&#8211; M\u00f4i tr\u01b0\u1eddng chua (H2S): M\u1ed9t s\u1ed1 m\u00e1c Duplex (2205, 2507) c\u00f3 th\u1ec3 \u0111\u00e1p \u1ee9ng ISO 15156\/NACE MR0175 trong \u0111i\u1ec1u ki\u1ec7n \u0111\u01b0\u1ee3c gi\u1edbi h\u1ea1n v\u1ec1 \u0111\u1ed9 b\u1ec1n v\u00e0 vi c\u1ea5u tr\u00fac.<\/p>\n<h3>Nhi\u1ec7t \u0111\u1ed9 l\u00e0m vi\u1ec7c v\u00e0 \u1ed5n \u0111\u1ecbnh pha<\/h3>\n<p>&#8211; Tr\u00e1nh l\u00e0m vi\u1ec7c li\u00ean t\u1ee5c >250\u2013300\u00b0C v\u1edbi 2205; nguy c\u01a1 k\u1ebft t\u1ee7a pha sigma (600\u20131000\u00b0C) g\u00e2y gi\u00f2n, gi\u1ea3m dai v\u00e0 gi\u1ea3m ch\u1ed1ng \u0103n m\u00f2n.<br \/>\n&#8211; Nhi\u1ec7t \u0111\u1ed9 th\u1ea5p: nhi\u1ec1u m\u00e1c Duplex v\u1eadn h\u00e0nh t\u1ed1t t\u1edbi -50\u00b0C; ki\u1ec3m ch\u1ee9ng theo ti\u00eau chu\u1ea9n d\u1ef1 \u00e1n c\u1ee5 th\u1ec3.<\/p>\n<h3>T\u1eeb t\u00ednh, gia c\u00f4ng, t\u1ea1o h\u00ecnh<\/h3>\n<p>&#8211; T\u1eeb t\u00ednh: c\u00f3 t\u1eeb t\u00ednh nh\u1eb9 do pha ferrite (kh\u00e1c 304\/316 g\u1ea7n nh\u01b0 kh\u00f4ng t\u1eeb).<br \/>\n&#8211; T\u1ea1o h\u00ecnh: c\u1ea7n l\u1ef1c l\u1edbn h\u01a1n 304\/316; b\u00e1n k\u00ednh u\u1ed1n t\u1ed1i thi\u1ec3u l\u1edbn h\u01a1n; n\u00ean \u1ee7 dung d\u1ecbch v\u00e0 l\u00e0m s\u1ea1ch sau gia c\u00f4ng n\u1eb7ng.<br \/>\n&#8211; Gia c\u00f4ng c\u1eaft g\u1ecdt: d\u00f9ng dao h\u1ee3p kim c\u1ee9ng, t\u1ed1c \u0111\u1ed9 th\u1ea5p h\u01a1n 304\/316, t\u01b0\u1edbi ngu\u1ed9i d\u1ed3i d\u00e0o, g\u00e1 k\u1eb9p ch\u1eafc \u0111\u1ec3 h\u1ea1n ch\u1ebf h\u00f3a b\u1ec1n bi\u1ebfn d\u1ea1ng.<\/p>\n<h2 id=\"toc-3-so-sanh-nhanh-duplex-vs-304316430\">So s\u00e1nh nhanh: Duplex vs 304\/316\/430<\/h2>\n<p>&#8211; Khi ch\u1ecdn 304\/316:<br \/>\n  &#8211; M\u00f4i tr\u01b0\u1eddng s\u1ea1ch, n\u1ed9i th\u1ea5t, th\u1ef1c ph\u1ea9m nh\u1eb9, t\u1ea3i c\u01a1 kh\u00ed th\u1ea5p, c\u1ea7n b\u1ec1 m\u1eb7t b\u00f3ng g\u01b0\u01a1ng cao.<br \/>\n&#8211; Khi ch\u1ecdn 430 (ferritic):<br \/>\n  &#8211; Y\u00eau c\u1ea7u trang tr\u00ed, t\u1eeb t\u00ednh, chi ph\u00ed th\u1ea5p, m\u00f4i tr\u01b0\u1eddng kh\u00f4 r\u00e1o.<br \/>\n&#8211; Khi n\u00ean ch\u1ecdn Duplex (2205\/lean\/super):<br \/>\n  &#8211; C\u1ea7n gi\u1edbi h\u1ea1n ch\u1ea3y cao \u0111\u1ec3 gi\u1ea3m chi\u1ec1u d\u00e0y t\u1ea5m\/k\u1ebft c\u1ea5u.<br \/>\n  &#8211; C\u00f3 ion Cl- (n\u01b0\u1edbc bi\u1ec3n, s\u01b0\u01a1ng m\u1eb7n ven bi\u1ec3n, th\u00e1p gi\u1ea3i nhi\u1ec7t), nguy c\u01a1 SCC.<br \/>\n  &#8211; T\u1ea3i tr\u1ecdng, \u00e1p su\u1ea5t cao trong b\u1ed3n, \u1ed1ng, trao \u0111\u1ed5i nhi\u1ec7t; y\u00eau c\u1ea7u LCC th\u1ea5p v\u00e0 tu\u1ed5i th\u1ecd d\u00e0i.<\/p>\n<h2 id=\"toc-4-ung-dung-tieu-bieu-tai-viet-nam\">\u1ee8ng d\u1ee5ng ti\u00eau bi\u1ec3u t\u1ea1i Vi\u1ec7t Nam<\/h2>\n<p>&#8211; D\u1ea7u kh\u00ed \u2013 h\u00f3a d\u1ea7u: \u0111\u01b0\u1eddng \u1ed1ng topside, manifold, trao \u0111\u1ed5i nhi\u1ec7t, b\u00ecnh \u00e1p l\u1ef1c, n\u01b0\u1edbc c\u1ee9u h\u1ecfa n\u01b0\u1edbc bi\u1ec3n.<br \/>\n&#8211; X\u1eed l\u00fd n\u01b0\u1edbc \u2013 RO \u2013 kh\u1eed m\u1eb7n: khung k\u1ebft c\u1ea5u, \u1ed1ng cao \u00e1p, b\u1ed3n l\u1ecdc, \u0111\u01b0\u1eddng \u1ed1ng n\u01b0\u1edbc mu\u1ed1i.<br \/>\n&#8211; C\u00f4ng nghi\u1ec7p gi\u1ea5y &#038; b\u1ed9t gi\u1ea5y: thi\u1ebft b\u1ecb r\u1eeda, b\u1ec3 ch\u1ee9a h\u00f3a ch\u1ea5t c\u00f3 Cl-.<br \/>\n&#8211; H\u1ea1 t\u1ea7ng ven bi\u1ec3n: lan can, bu l\u00f4ng neo, c\u00e1p, gi\u00e0n th\u00e9p ven bi\u1ec3n; ch\u1ed1ng r\u1ed7 v\u00e0 SCC t\u1ed1t h\u01a1n 316L.<br \/>\n&#8211; Th\u1ef1c ph\u1ea9m \u2013 \u0111\u1ed3 u\u1ed1ng \u2013 mu\u1ed1i \u2013 h\u1ea3i s\u1ea3n: b\u1ed3n, \u1ed1ng, v\u00edt t\u1ea3i, n\u01a1i c\u00f3 clo, n\u01b0\u1edbc mu\u1ed1i v\u1ec7 sinh.<br \/>\n&#8211; X\u00e2y d\u1ef1ng: c\u1ed1t th\u00e9p duplex cho m\u00f4i tr\u01b0\u1eddng bi\u1ec3n; t\u1ea5m m\u1eb7t d\u1ef1ng, c\u1ea7u \u0111i b\u1ed9 ven bi\u1ec3n.<br \/>\n&#8211; N\u0103ng l\u01b0\u1ee3ng: th\u00e1p gi\u1ea3i nhi\u1ec7t, h\u1ec7 n\u01b0\u1edbc l\u00e0m m\u00e1t c\u00f4ng nghi\u1ec7p c\u00f3 mu\u1ed1i.<\/p>\n<p>V\u00ed d\u1ee5 th\u1ef1c t\u1ebf: H\u1ec7 \u1ed1ng n\u01b0\u1edbc l\u00e0m m\u00e1t tu\u1ea7n ho\u00e0n b\u1eb1ng 316L b\u1ecb r\u1ed7 sau 1\u20132 n\u0103m do Cl- v\u00e0 nhi\u1ec7t \u0111\u1ed9 cao. Chuy\u1ec3n sang 2205 v\u1edbi c\u00f9ng \u0111i\u1ec1u ki\u1ec7n gi\u00fap lo\u1ea1i b\u1ecf r\u1ed7\/khe, t\u0103ng \u0111\u1ed9 an to\u00e0n \u00e1p l\u1ef1c v\u00e0 k\u00e9o d\u00e0i chu k\u1ef3 b\u1ea3o tr\u00ec; nhi\u1ec1u \u0111\u01a1n v\u1ecb c\u00f2n gi\u1ea3m chi\u1ec1u d\u00e0y \u1ed1ng nh\u1edd b\u1ec1n ch\u1ea3y cao h\u01a1n.<\/p>\n<h2 id=\"toc-5-huong-dan-chon-mac-duplex-theo-moi-truong\">H\u01b0\u1edbng d\u1eabn ch\u1ecdn m\u00e1c Duplex theo m\u00f4i tr\u01b0\u1eddng<\/h2>\n<p>&#8211; N\u01b0\u1edbc ng\u1ecdt c\u00f4ng nghi\u1ec7p, Cl- < 200 ppm, nhi\u1ec7t \u0111\u1ed9 < 50\u00b0C:\n  - Lean duplex (S32101\/S32304) ho\u1eb7c 2205 n\u1ebfu c\u00f3 t\u1ea3i cao\/c\u1ea7n tu\u1ed5i th\u1ecd d\u00e0i.\n- N\u01b0\u1edbc gi\u1ea3i nhi\u1ec7t\/n\u01b0\u1edbc mu\u1ed1i trung b\u00ecnh, Cl- 200\u20131000 ppm, t\u1edbi ~70\u00b0C:\n  - 2205 th\u01b0\u1eddng an to\u00e0n; ch\u00fa \u00fd thi\u1ebft k\u1ebf ch\u1ed1ng khe h\u1edf, h\u00e0n \u0111\u00fang quy ph\u1ea1m.\n- N\u01b0\u1edbc bi\u1ec3n t\u1ef1 nhi\u00ean, b\u1ed1c h\u01a1i m\u1eb7n, Cl- > 1000 ppm ho\u1eb7c nhi\u1ec7t \u0111\u1ed9 > 70\u00b0C:<br \/>\n  &#8211; Super duplex 2507\/S32760.<br \/>\n&#8211; M\u00f4i tr\u01b0\u1eddng c\u00f3 H2S\/CO2 (d\u1ecbch chua):<br \/>\n  &#8211; D\u00f9ng 2205\/2507 theo ISO 15156\/NACE MR0175; ki\u1ec3m tra gi\u1edbi h\u1ea1n \u0111\u1ed9 b\u1ec1n v\u00e0 pha ferrite sau h\u00e0n.<br \/>\n&#8211; M\u00f4i tr\u01b0\u1eddng axit m\u1ea1nh\/kh\u1eed \u0111\u1eb7c th\u00f9:<br \/>\n  &#8211; Tham kh\u1ea3o bi\u1ec3u \u0111\u1ed3 \u0103n m\u00f2n; c\u00f3 th\u1ec3 c\u1ea7n h\u1ee3p kim Ni cao (kh\u00f4ng thu\u1ed9c Duplex).<\/p>\n<p>L\u01b0u \u00fd: Thi\u1ebft k\u1ebf tr\u00e1nh khe h\u1edf, ki\u1ec3m so\u00e1t t\u1ed1c \u0111\u1ed9 d\u00f2ng \u0111\u1ec3 ng\u0103n c\u00e1u c\u1eb7n, b\u1ea3o v\u1ec7 b\u1ec1 m\u1eb7t th\u1ee5 \u0111\u1ed9ng.<\/p>\n<h2 id=\"toc-6-luu-y-ky-thuat-khi-han-lam-sach-va-bao-tri\">L\u01b0u \u00fd k\u1ef9 thu\u1eadt khi h\u00e0n, l\u00e0m s\u1ea1ch v\u00e0 b\u1ea3o tr\u00ec<\/h2>\n<p>&#8211; V\u1eadt li\u1ec7u h\u00e0n:<br \/>\n  &#8211; 2205: d\u00f9ng que\/kim lo\u1ea1i \u0111i\u1ec1n 22 09 3 N L (v\u00ed d\u1ee5 ER2209) \u0111\u1ec3 t\u00e1i t\u1ea1o c\u00e2n b\u1eb1ng pha v\u00e0 t\u0103ng N.<br \/>\n  &#8211; 2507: d\u00f9ng 25 10 4 N (v\u00ed d\u1ee5 ER2594).<br \/>\n&#8211; Quy tr\u00ecnh h\u00e0n:<br \/>\n  &#8211; Nhi\u1ec7t \u0111\u1ea7u v\u00e0o v\u1eeba ph\u1ea3i; nhi\u1ec7t \u0111\u1ed9 li\u00ean l\u1edbp th\u01b0\u1eddng < 150\u00b0C cho 2205.\n  - Che kh\u00ed g\u1ed1c (back purging) b\u1eb1ng Ar\/N2 \u0111\u1ec3 gi\u1eef N, ng\u0103n oxy h\u00f3a m\u1eb7t g\u1ed1c.\n  - Tr\u00e1nh nung k\u00e9o d\u00e0i v\u00f9ng 600\u20131000\u00b0C (pha sigma).\n- X\u1eed l\u00fd sau h\u00e0n:\n  - T\u1ea9y g\u1ec9 axit (pickling) \u0111\u1ec3 lo\u1ea1i l\u1edbp oxit gi\u00e0u Cr; sau \u0111\u00f3 th\u1ee5 \u0111\u1ed9ng h\u00f3a.\n  - V\u1ec7 sinh tr\u00e1nh nhi\u1ec5m s\u1eaft cacbon (b\u1ee5i m\u00e0i, k\u1eb9p th\u00e9p \u0111en); d\u00f9ng d\u1ee5ng c\u1ee5 ri\u00eang cho inox.\n- Gia c\u00f4ng t\u1ea1o h\u00ecnh:\n  - T\u00ednh l\u00f2 xo h\u1ed3i l\u1edbn; t\u0103ng b\u00e1n k\u00ednh u\u1ed1n v\u00e0 d\u00f9ng b\u00f4i tr\u01a1n t\u1ed1t.\n- B\u1ea3o tr\u00ec:\n  - R\u1eeda n\u01b0\u1edbc ng\u1ecdt \u0111\u1ecbnh k\u1ef3 trong m\u00f4i tr\u01b0\u1eddng bi\u1ec3n; tr\u00e1nh mu\u1ed1i kh\u00f4 \u0111\u1ecdng l\u1ea1i.\n  - Tr\u00e1nh clo n\u1ed3ng \u0111\u1ed9 cao\/\u0111\u1ecdng c\u1ee5c b\u1ed9 khi nhi\u1ec7t \u0111\u1ed9 cao.\n\n\n\n<h2 id=\"toc-7-tieu-chuan-dang-hang-va-ton-kho-dien-hinh\">Ti\u00eau chu\u1ea9n, d\u1ea1ng h\u00e0ng v\u00e0 t\u1ed3n kho \u0111i\u1ec3n h\u00ecnh<\/h2>\n<p>&#8211; Ti\u00eau chu\u1ea9n v\u1eadt li\u1ec7u\/s\u1ea3n ph\u1ea9m:<br \/>\n  &#8211; T\u1ea5m\/cu\u1ed9n: ASTM A240\/A480; \u1ed0ng h\u00e0n: ASTM A312; \u1ed0ng \u0111\u00fac: ASTM A790; Thanh: ASTM A276; M\u1eb7t b\u00edch: ASTM A182; Ph\u1ee5 ki\u1ec7n h\u00e0n: ASTM A815.<br \/>\n  &#8211; T\u01b0\u01a1ng \u0111\u01b0\u01a1ng EN: 1.4462 (2205), 1.4410 (2507).<br \/>\n&#8211; D\u1ea1ng h\u00e0ng ph\u1ed5 bi\u1ebfn t\u1ea1i Vi\u1ec7t Nam:<br \/>\n  &#8211; T\u1ea5m 2205: d\u00e0y ~3\u201330 mm; b\u1ec1 m\u1eb7t 2B\/No.1.<br \/>\n  &#8211; \u1ed0ng 2205 h\u00e0n\/\u0111\u00fac: DN15\u2013DN300, SCH10S\u201340S.<br \/>\n  &#8211; Ph\u1ee5 ki\u1ec7n h\u00e0n v\u00e0 m\u1eb7t b\u00edch 2205\/2507.<br \/>\n  &#8211; Lean duplex cho k\u1ebft c\u1ea5u\/\u1ed1ng m\u1ecfng y\u00eau c\u1ea7u b\u1ec1n cao.<br \/>\n  &#8211; Li\u00ean h\u1ec7 \u0111\u1ec3 x\u00e1c nh\u1eadn t\u1ed3n kho, ch\u1ee9ng ch\u1ec9 Mill Test Certificate (EN 10204 3.1).<\/p>\n<h2 id=\"toc-8-chi-phi-va-hieu-qua-vong-doi-lcc\">Chi ph\u00ed v\u00e0 hi\u1ec7u qu\u1ea3 v\u00f2ng \u0111\u1eddi (LCC)<\/h2>\n<p>&#8211; Gi\u00e1 v\u1eadt li\u1ec7u Duplex th\u01b0\u1eddng cao h\u01a1n 304\/316, nh\u01b0ng:<br \/>\n  &#8211; C\u00f3 th\u1ec3 gi\u1ea3m chi\u1ec1u d\u00e0y nh\u1edd b\u1ec1n ch\u1ea3y cao \u2192 gi\u1ea3m kh\u1ed1i l\u01b0\u1ee3ng.<br \/>\n  &#8211; Tu\u1ed5i th\u1ecd cao trong m\u00f4i tr\u01b0\u1eddng clorua \u2192 gi\u1ea3m d\u1eebng m\u00e1y, b\u1ea3o tr\u00ec, thay th\u1ebf.<br \/>\n&#8211; T\u1ed5ng chi ph\u00ed v\u00f2ng \u0111\u1eddi th\u01b0\u1eddng th\u1ea5p h\u01a1n khi m\u00f4i tr\u01b0\u1eddng c\u00f3 nguy c\u01a1 r\u1ed7\/SCC.<\/p>\n<h2 id=\"toc-9-cau-hoi-thuong-gap\">C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/h2>\n<p>&#8211; Duplex c\u00f3 b\u1ecb h\u00fat nam ch\u00e2m kh\u00f4ng? C\u00f3, do pha ferrite.<br \/>\n&#8211; 2205 c\u00f3 \u201ckh\u00f4ng g\u1ec9 tuy\u1ec7t \u0111\u1ed1i\u201d kh\u00f4ng? Kh\u00f4ng v\u1eadt li\u1ec7u n\u00e0o \u201ckh\u00f4ng g\u1ec9\u201d tuy\u1ec7t \u0111\u1ed1i; c\u1ea7n thi\u1ebft k\u1ebf \u0111\u00fang, h\u00e0n chu\u1ea9n v\u00e0 b\u1ea3o tr\u00ec.<br \/>\n&#8211; D\u00f9ng cho n\u01b0\u1edbc u\u1ed1ng\/TP th\u1ef1c ph\u1ea9m \u0111\u01b0\u1ee3c kh\u00f4ng? C\u00f3, nhi\u1ec1u m\u00e1c Duplex \u0111\u1ea1t y\u00eau c\u1ea7u v\u1ec7 sinh; tham chi\u1ebfu quy \u0111\u1ecbnh ng\u00e0nh c\u1ee5 th\u1ec3.<br \/>\n&#8211; C\u00f3 \u0111\u00e1nh b\u00f3ng g\u01b0\u01a1ng \u0111\u01b0\u1ee3c kh\u00f4ng? C\u00f3 th\u1ec3, nh\u01b0ng c\u1ee9ng h\u01a1n 304 n\u00ean c\u1ea7n quy tr\u00ecnh m\u00e0i b\u00f3ng ph\u00f9 h\u1ee3p.<br \/>\n&#8211; C\u00f3 nhi\u1ec7t luy\u1ec7n t\u0103ng c\u1ee9ng \u0111\u01b0\u1ee3c kh\u00f4ng? Kh\u00f4ng; ch\u1ec9 \u1ee7 dung d\u1ecbch v\u00e0 l\u00e0m ngu\u1ed9i nhanh \u0111\u1ec3 ph\u1ee5c h\u1ed3i vi c\u1ea5u tr\u00fac.<\/p>\n<h2 id=\"toc-10-nguon-tham-khao\">Ngu\u1ed3n tham kh\u1ea3o<\/h2>\n<p>&#8211; Outokumpu Duplex Stainless Steel Handbook: https:\/\/www.outokumpu.com\/en\/duplex<br \/>\n&#8211; IMOA (International Molybdenum Association) \u2013 Guidelines for Duplex Stainless Steels: https:\/\/www.imoa.info\/molybdenum-uses\/moly-grade-library\/duplex-stainless-steels.php<br \/>\n&#8211; Alleima (Sandvik) Datasheets SAF 2205\/2507: https:\/\/www.alleima.com\/en\/products\/materials-center\/stainless-steel\/duplex-stainless-steel\/<br \/>\n&#8211; Atlas Steels Technical Handbook \u2013 Duplex Stainless Steels: https:\/\/www.atlassteels.com.au\/technical-handbook\/<br \/>\n&#8211; ASTM\/ASME Standards (A240, A312, A790, A182, A815): https:\/\/www.astm.org<br \/>\n&#8211; ISO 15156 \/ NACE MR0175: https:\/\/www.nace.org\/resources\/standards (tham kh\u1ea3o \u0111i\u1ec1u ki\u1ec7n d\u1ecbch chua)<\/p>\n<h2 id=\"toc-11-ket-luan\">K\u1ebft lu\u1eadn<\/h2>\n<p>Inox Duplex l\u00e0 \u201cc\u1ea7u n\u1ed1i\u201d gi\u1eefa austenitic v\u00e0 ferritic: b\u1ec1n ch\u1ea3y cao, ch\u1ed1ng r\u1ed7\/khe clorua v\u01b0\u1ee3t tr\u1ed9i v\u00e0 kh\u00e1ng SCC t\u1ed1t, trong khi v\u1eabn gi\u1eef \u0111\u1ed9 dai v\u00e0 kh\u1ea3 n\u0103ng h\u00e0n ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c. 2205 l\u00e0 m\u00e1c ti\u00eau chu\u1ea9n cho h\u1ea7u h\u1ebft h\u1ec7 th\u1ed1ng c\u00f3 Cl- trung b\u00ecnh; 2507\/super duplex ph\u00f9 h\u1ee3p n\u01b0\u1edbc bi\u1ec3n\/nhi\u1ec7t \u0111\u1ed9 cao; lean duplex t\u1ed1i \u01b0u chi ph\u00ed cho n\u01b0\u1edbc \u00edt mu\u1ed1i nh\u01b0ng c\u1ea7n b\u1ec1n cao. Ch\u1ecdn \u0111\u00fang m\u00e1c theo n\u1ed3ng \u0111\u1ed9 clorua, nhi\u1ec7t \u0111\u1ed9, h\u00ecnh h\u1ecdc chi ti\u1ebft v\u00e0 tu\u00e2n th\u1ee7 h\u00e0n \u2013 l\u00e0m s\u1ea1ch chu\u1ea9n s\u1ebd quy\u1ebft \u0111\u1ecbnh tu\u1ed5i th\u1ecd. <\/p>\n<p>C\u1ea7n t\u01b0 v\u1ea5n m\u00e1c Duplex ph\u00f9 h\u1ee3p, ch\u1ee9ng ch\u1ec9 v\u00e0 t\u1ed3n kho t\u1ea1i H\u00e0 N\u1ed9i? Li\u00ean h\u1ec7 Inox Cuong Thinh \u0111\u1ec3 \u0111\u01b0\u1ee3c b\u00e1o gi\u00e1 t\u1ed1t v\u00e0 h\u1ed7 tr\u1ee3 k\u1ef9 thu\u1eadt:<br \/>\n&#8211; Hotline: 0343.417.281<br \/>\n&#8211; Email: inoxcongnghiep.cuongthinh@gmail.com<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Gi\u1ea3i th\u00edch inox Duplex: c\u1ea5u tr\u00fac hai pha, b\u1ec1n g\u1ea5p \u0111\u00f4i 304, ch\u1ed1ng r\u1ed7 clorua v\u01b0\u1ee3t tr\u1ed9i. So s\u00e1nh 304\/316, m\u00e1c 2205\/2507\/lean, \u1ee9ng d\u1ee5ng v\u00e0 l\u01b0u \u00fd h\u00e0n.<\/p>\n","protected":false},"author":7,"featured_media":1032,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[23],"tags":[],"class_list":["post-2028","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\/2028","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=2028"}],"version-history":[{"count":0,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/posts\/2028\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/media\/1032"}],"wp:attachment":[{"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/media?parent=2028"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/categories?post=2028"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/tags?post=2028"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}