{"id":2134,"date":"2026-06-13T00:33:43","date_gmt":"2026-06-12T17:33:43","guid":{"rendered":"https:\/\/inoxcuongthinh.com\/bulong-oc-vit-ecu-inox-phan-loai-va-cach-chon-theo-moi-truong\/"},"modified":"2026-06-13T00:33:43","modified_gmt":"2026-06-12T17:33:43","slug":"bulong-oc-vit-ecu-inox-phan-loai-va-cach-chon-theo-moi-truong","status":"publish","type":"post","link":"https:\/\/inoxcuongthinh.com\/bulong-oc-vit-ecu-inox-phan-loai-va-cach-chon-theo-moi-truong\/","title":{"rendered":"Bulong, \u1ed1c v\u00edt, ecu Inox: Ph\u00e2n lo\u1ea1i v\u00e0 c\u00e1ch ch\u1ecdn theo m\u00f4i tr\u01b0\u1eddng"},"content":{"rendered":"<div class=\"custom-toc\">\n<h3>N\u1ed9i dung ch\u00ednh<\/h3>\n<ul>\n<li><a href=\"#toc-0-tong-quan-nhanh-bulong-oc-vit-ecu-inox-gom-nhung-g\">T\u1ed5ng quan nhanh: bulong, \u1ed1c v\u00edt, ecu inox g\u1ed3m nh\u1eefng g\u00ec?<\/a><\/li>\n<li><a href=\"#toc-1-phan-loai-theo-vat-lieu-inox-va-dac-tinh\">Ph\u00e2n lo\u1ea1i theo v\u1eadt li\u1ec7u Inox v\u00e0 \u0111\u1eb7c t\u00ednh<\/a><\/li>\n<li><a href=\"#toc-2-chon-bulong-oc-vit-ecu-inox-theo-moi-truong-su-dun\">Ch\u1ecdn bulong \u2013 \u1ed1c v\u00edt \u2013 ecu inox theo m\u00f4i tr\u01b0\u1eddng s\u1eed d\u1ee5ng<\/a><\/li>\n<li><a href=\"#toc-3-tieu-chuan-quy-cach-kich-thuoc-va-nhan-biet\">Ti\u00eau chu\u1ea9n, quy c\u00e1ch k\u00edch th\u01b0\u1edbc v\u00e0 nh\u1eadn bi\u1ebft<\/a><\/li>\n<li><a href=\"#toc-4-cuong-do-mo-men-siet-va-tranh-ket-ren-galling\">C\u01b0\u1eddng \u0111\u1ed9, m\u00f4-men si\u1ebft v\u00e0 tr\u00e1nh \u201ck\u1eb9t ren\u201d (galling)<\/a><\/li>\n<li><a href=\"#toc-5-an-mon-dien-hoa-va-cac-luu-y-lap-dat\">\u0102n m\u00f2n \u0111i\u1ec7n h\u00f3a v\u00e0 c\u00e1c l\u01b0u \u00fd l\u1eafp \u0111\u1eb7t<\/a><\/li>\n<li><a href=\"#toc-6-lua-chon-theo-ngan-sach-va-chi-phi-vong-doi-lcc\">L\u1ef1a ch\u1ecdn theo ng\u00e2n s\u00e1ch v\u00e0 chi ph\u00ed v\u00f2ng \u0111\u1eddi (LCC)<\/a><\/li>\n<li><a href=\"#toc-7-vi-du-chon-nhanh-theo-ung-dung-tai-viet-nam\">V\u00ed d\u1ee5 ch\u1ecdn nhanh theo \u1ee9ng d\u1ee5ng t\u1ea1i Vi\u1ec7t Nam<\/a><\/li>\n<li><a href=\"#toc-8-faq-ngan\">FAQ ng\u1eafn<\/a><\/li>\n<li><a href=\"#toc-9-nguon-tham-khao\">Ngu\u1ed3n tham kh\u1ea3o<\/a><\/li>\n<li><a href=\"#toc-10-ket-luan\">K\u1ebft lu\u1eadn<\/a><\/li>\n<\/ul>\n<\/div>\n<p>Trong th\u1ebf gi\u1edbi ph\u1ee5 ki\u1ec7n Inox cho x\u00e2y d\u1ef1ng v\u00e0 n\u1ed9i th\u1ea5t, bulong \u2013 \u1ed1c v\u00edt \u2013 ecu (\u0111ai \u1ed1c) l\u00e0 \u201ckh\u1edbp n\u1ed1i\u201d quy\u1ebft \u0111\u1ecbnh \u0111\u1ed9 b\u1ec1n, an to\u00e0n v\u00e0 tu\u1ed5i th\u1ecd c\u00f4ng tr\u00ecnh. B\u00e0i vi\u1ebft n\u00e0y l\u00e0 h\u01b0\u1edbng d\u1eabn \u0111\u1ea7y \u0111\u1ee7 v\u1ec1 ph\u00e2n lo\u1ea1i, ti\u00eau chu\u1ea9n v\u00e0 \u0111\u1eb7c bi\u1ec7t l\u00e0 c\u00e1ch ch\u1ecdn \u0111\u00fang lo\u1ea1i inox theo m\u00f4i tr\u01b0\u1eddng s\u1eed d\u1ee5ng t\u1ea1i Vi\u1ec7t Nam, gi\u00fap b\u1ea1n t\u1ed1i \u01b0u chi ph\u00ed v\u00f2ng \u0111\u1eddi v\u00e0 h\u1ea1n ch\u1ebf r\u1ee7i ro \u0103n m\u00f2n.<\/p>\n<h2 id=\"toc-0-tong-quan-nhanh-bulong-oc-vit-ecu-inox-gom-nhung-g\">T\u1ed5ng quan nhanh: bulong, \u1ed1c v\u00edt, ecu inox g\u1ed3m nh\u1eefng g\u00ec?<\/h2>\n<p>&#8211; Bulong (bolt): th\u00e2n ren (to\u00e0n ph\u1ea7n\/\u0111o\u1ea1n), \u0111\u1ea7u l\u1ee5c gi\u00e1c\/\u0111\u1ea7u tr\u00f2n\/bu l\u00f4ng n\u1edf\u2026 d\u00f9ng v\u1edbi \u0111ai \u1ed1c.<br \/>\n&#8211; \u1ed0c v\u00edt (screw): th\u01b0\u1eddng si\u1ebft tr\u1ef1c ti\u1ebfp v\u00e0o l\u1ed7 ren v\u1eadt li\u1ec7u ho\u1eb7c t\u00e1n ren; nhi\u1ec1u ki\u1ec3u \u0111\u1ea7u (d\u1eb9t, tr\u00f2n, l\u1ee5c gi\u00e1c ch\u00ecm, \u0111\u1ea7u bake\u2026).<br \/>\n&#8211; Ecu (\u0111ai \u1ed1c\/nut): l\u1ee5c gi\u00e1c, m\u0169 (cap), kh\u00f3a nylon (Nyloc), kh\u00f3a kim lo\u1ea1i, b\u01b0\u1edbm\u2026 d\u00f9ng \u0111\u1ec3 k\u1eb9p ch\u1eb7t bulong.<br \/>\n&#8211; Long \u0111en (washer): ph\u1eb3ng, v\u00eanh, v\u00eanh \u0111\u00f4i, v\u00f2ng kh\u00f3a d\u1ea1ng n\u00eam (wedge-lock) t\u0103ng ch\u1ed1ng t\u1ef1 th\u00e1o l\u1ecfng.<\/p>\n<h3>K\u00fd hi\u1ec7u v\u1eadt li\u1ec7u v\u00e0 c\u1ea5p b\u1ec1n th\u01b0\u1eddng g\u1eb7p<\/h3>\n<p>&#8211; Nh\u00f3m austenitic (kh\u00f4ng nhi\u1ec5m t\u1eeb ho\u1eb7c nhi\u1ec5m t\u1eeb r\u1ea5t nh\u1eb9): A2 \u2248 304\/304L, A4 \u2248 316\/316L, A5 \u2248 316Ti\/321; k\u00fd hi\u1ec7u c\u1ea5p b\u1ec1n A2-70, A4-80\u2026<br \/>\n&#8211; Nh\u00f3m martensitic\/ferritic: 410\/420 (c\u00f3 t\u1eeb t\u00ednh, c\u1ee9ng h\u01a1n, ch\u1ed1ng \u0103n m\u00f2n k\u00e9m h\u01a1n 304\/316), 430 (ferritic).<br \/>\n&#8211; Duplex 2205\/2507: b\u1ec1n c\u01a1 h\u1ecdc cao, ch\u1ed1ng r\u1ed7 pitting r\u1ea5t t\u1ed1t \u1edf m\u00f4i tr\u01b0\u1eddng clorua.<br \/>\n&#8211; C\u1ea5p b\u1ec1n theo ISO 3506-1:<br \/>\n  &#8211; \u201c70\u201d ~ gi\u1edbi h\u1ea1n b\u1ec1n k\u00e9o t\u1ed1i thi\u1ec3u 700 MPa; \u201c80\u201d ~ 800 MPa.<br \/>\n  &#8211; V\u00ed d\u1ee5: A2-70 (inox 304, b\u1ec1n k\u00e9o min 700 MPa), A4-80 (inox 316, b\u1ec1n k\u00e9o min 800 MPa).<\/p>\n<h2 id=\"toc-1-phan-loai-theo-vat-lieu-inox-va-dac-tinh\">Ph\u00e2n lo\u1ea1i theo v\u1eadt li\u1ec7u Inox v\u00e0 \u0111\u1eb7c t\u00ednh<\/h2>\n<h3>Austenitic: 201, 304\/304L (A2), 316\/316L (A4)<\/h3>\n<p>&#8211; Inox 201 (Mn\u2013N): gi\u00e1 t\u1ed1t, d\u00f9ng n\u1ed9i th\u1ea5t kh\u00f4; k\u00e9m b\u1ec1n clorua, d\u1ec5 \u201c\u1ed1 tr\u00e0\u201d ngo\u00e0i tr\u1eddi ven bi\u1ec3n.<br \/>\n&#8211; Inox 304\/304L (A2): c\u00e2n b\u1eb1ng gi\u1eefa gi\u00e1 v\u00e0 ch\u1ed1ng \u0103n m\u00f2n, ph\u00f9 h\u1ee3p h\u1ea7u h\u1ebft c\u00f4ng tr\u00ecnh \u0111\u00f4 th\u1ecb, c\u00f4ng nghi\u1ec7p nh\u1eb9, th\u1ef1c ph\u1ea9m kh\u00f4.<br \/>\n&#8211; Inox 316\/316L (A4): th\u00eam Mo (~2\u20132,5%) t\u0103ng ch\u1ed1ng r\u1ed7 pitting trong m\u00f4i tr\u01b0\u1eddng clorua (bi\u1ec3n, h\u00f3a ch\u1ea5t nh\u1eb9), l\u1ef1a ch\u1ecdn chu\u1ea9n cho ven bi\u1ec3n, b\u1ec3 b\u01a1i, m\u00f4i tr\u01b0\u1eddng \u1ea9m m\u1eb7n.<\/p>\n<h3>Martensitic\/Ferritic: 410\/420, 430<\/h3>\n<p>&#8211; \u0110\u1ed9 c\u1ee9ng\/c\u01b0\u1eddng \u0111\u1ed9 t\u01b0\u01a1ng \u0111\u1ed1i cao, ch\u1ecbu m\u00e0i m\u00f2n t\u1ed1t; ch\u1ed1ng \u0103n m\u00f2n ch\u1ec9 \u1edf m\u1ee9c v\u1eeba ph\u1ea3i. D\u00f9ng c\u01a1 kh\u00ed ph\u1ed5 th\u00f4ng, chi ti\u1ebft \u00edt ti\u1ebfp x\u00fac \u1ea9m m\u1eb7n. Kh\u00f4ng khuy\u1ebfn ngh\u1ecb cho b\u1edd bi\u1ec3n, h\u00f3a ch\u1ea5t.<\/p>\n<h3>Duplex 2205 (v\u00e0 Super Duplex)<\/h3>\n<p>&#8211; C\u01b0\u1eddng \u0111\u1ed9 cao, ch\u1ed1ng r\u1ed7 v\u00e0 n\u1ee9t do \u1ee9ng su\u1ea5t trong ion clorua v\u01b0\u1ee3t tr\u1ed9i so v\u1edbi 316. Ph\u00f9 h\u1ee3p khu v\u1ef1c phun s\u00f3ng, n\u01b0\u1edbc m\u1eb7n n\u00f3ng, nh\u00e0 m\u00e1y mu\u1ed1i, nu\u00f4i tr\u1ed3ng th\u1ee7y h\u1ea3i s\u1ea3n, k\u1ebft c\u1ea5u bi\u1ec3n.<\/p>\n<h2 id=\"toc-2-chon-bulong-oc-vit-ecu-inox-theo-moi-truong-su-dun\">Ch\u1ecdn bulong \u2013 \u1ed1c v\u00edt \u2013 ecu inox theo m\u00f4i tr\u01b0\u1eddng s\u1eed d\u1ee5ng<\/h2>\n<h3>1) Trong nh\u00e0 kh\u00f4, n\u1ed9i th\u1ea5t, HVAC<\/h3>\n<p>&#8211; Khuy\u1ebfn ngh\u1ecb: A2-70 (304) ho\u1eb7c 201 cho chi ti\u1ebft th\u1ea9m m\u1ef9, kh\u00f4 r\u00e1o.<br \/>\n&#8211; L\u01b0u \u00fd: n\u01a1i c\u00f3 h\u01a1i \u1ea9m li\u00ean t\u1ee5c\/condensate n\u00ean ch\u1ecdn A2-70 thay v\u00ec 201.<\/p>\n<h3>2) Ngo\u00e0i tr\u1eddi \u0111\u00f4 th\u1ecb, c\u00f4ng tr\u00ecnh d\u00e2n d\u1ee5ng xa bi\u1ec3n (>5 km)<\/h3>\n<p>&#8211; Khuy\u1ebfn ngh\u1ecb: A2-70\/A2-80 (304\/304L).<br \/>\n&#8211; B\u1ea3o tr\u00ec: v\u1ec7 sinh \u0111\u1ecbnh k\u1ef3 3\u20136 th\u00e1ng \u0111\u1ec3 h\u1ea1n ch\u1ebf \u201c\u1ed1 tr\u00e0\u201d.<\/p>\n<h3>3) Ven bi\u1ec3n, \u0111\u1ea3o, khu c\u00f4ng nghi\u1ec7p gi\u00f3 bi\u1ec3n (\u22645 km t\u1eeb b\u1edd ho\u1eb7c s\u01b0\u01a1ng mu\u1ed1i)<\/h3>\n<p>&#8211; Khuy\u1ebfn ngh\u1ecb: A4-70\/A4-80 (316\/316L).<br \/>\n&#8211; V\u00f9ng phun s\u00f3ng tr\u1ef1c di\u1ec7n, c\u00f4ng tr\u00ecnh c\u1ea3ng: c\u00e2n nh\u1eafc Duplex 2205 cho bu l\u00f4ng ch\u00ednh; t\u1ed1i thi\u1ec3u A4-80 cho chi ti\u1ebft ph\u1ee5.<br \/>\n&#8211; B\u1ea3o tr\u00ec: r\u1eeda n\u01b0\u1edbc ng\u1ecdt 1\u20134 tu\u1ea7n\/l\u1ea7n; tr\u00e1nh \u0111\u1ecdng mu\u1ed1i k\u1ebd h\u1edf.<\/p>\n<h3>4) B\u1ec3 b\u01a1i, spa, khu natatorium (c\u00f3 chlorine\/chloramine)<\/h3>\n<p>&#8211; Khuy\u1ebfn ngh\u1ecb: A4-80 (316\/316L) \u1edf khu v\u1ef1c th\u00f4ng tho\u00e1ng; Duplex 2205 cho tr\u1ea7n treo, bu l\u00f4ng ch\u1ecbu t\u1ea3i ph\u00eda tr\u00ean m\u1eb7t n\u01b0\u1edbc\/kh\u00f4ng kh\u00ed ch\u1ee9a chloramine.<br \/>\n&#8211; Tr\u00e1nh d\u00f9ng 201\/304; ki\u1ec3m so\u00e1t th\u00f4ng gi\u00f3 v\u00e0 v\u1ec7 sinh th\u01b0\u1eddng xuy\u00ean.<\/p>\n<h3>5) Th\u1ef1c ph\u1ea9m, d\u01b0\u1ee3c, y t\u1ebf<\/h3>\n<p>&#8211; Khuy\u1ebfn ngh\u1ecb: 304L\/A2-70 cho khu v\u1ef1c kh\u00f4; 316L\/A4-70 cho khu \u1ea9m\/ti\u1ebfp x\u00fac clorua nh\u1eb9. \u01afu ti\u00ean b\u1ec1 m\u1eb7t th\u1ee5 \u0111\u1ed9ng\/electropolish \u0111\u1ec3 gi\u1ea3m b\u00e1m b\u1ea9n.<br \/>\n&#8211; K\u1ebft h\u1ee3p long \u0111en ph\u1eb3ng, tr\u00e1nh long \u0111en v\u00eanh g\u00e2y k\u1ebd h\u1edf b\u00e1m b\u1ea9n.<\/p>\n<h3>6) H\u00f3a ch\u1ea5t nh\u1eb9, n\u01b0\u1edbc th\u1ea3i, xi m\u0103ng \u01b0\u1edbt, g\u1ed7 t\u1ea9m mu\u1ed1i \u0111\u1ed3ng (ACQ\/CCA)<\/h3>\n<p>&#8211; Khuy\u1ebfn ngh\u1ecb: 316L\/A4-70; n\u01a1i c\u00f3 clorua\/ki\u1ec1m cao c\u00e2n nh\u1eafc Duplex 2205.<br \/>\n&#8211; Tr\u00e1nh ti\u1ebfp x\u00fac tr\u1ef1c ti\u1ebfp inox v\u1edbi \u0111\u1ed3ng\/\u0111\u1ed3ng thau trong m\u00f4i tr\u01b0\u1eddng \u1ea9m m\u1eb7n (\u0103n m\u00f2n \u0111i\u1ec7n h\u00f3a): d\u00f9ng \u0111\u1ec7m c\u00e1ch \u0111i\u1ec7n.<\/p>\n<h3>7) Nhi\u1ec7t \u0111\u1ed9 cao<\/h3>\n<p>&#8211; 304\/316 gi\u1eef b\u1ec1n c\u01a1 h\u1ecdc t\u1ed1t \u0111\u1ebfn kho\u1ea3ng 300\u2013400\u00b0C cho k\u1ebft c\u1ea5u ch\u1ecbu t\u1ea3i; tr\u00ean n\u1eefa c\u1ea7n c\u1ea5p \u0111\u1eb7c bi\u1ec7t (321\/347\/310) theo ti\u00eau chu\u1ea9n v\u1eadt li\u1ec7u ch\u1ecbu nhi\u1ec7t.<br \/>\n&#8211; Tham kh\u1ea3o bi\u1ec3u \u0111\u1ed3 t\u1eeb nh\u00e0 s\u1ea3n xu\u1ea5t\/ASTM khi d\u00f9ng cho n\u1ed3i h\u01a1i, l\u00f2.<\/p>\n<h3>8) M\u00f4i tr\u01b0\u1eddng rung \u0111\u1ed9ng, th\u00e1o l\u1eafp nhi\u1ec1u<\/h3>\n<p>&#8211; D\u00f9ng ecu kh\u00f3a kim lo\u1ea1i, Nyloc (\u2264120\u00b0C), ho\u1eb7c v\u00f2ng kh\u00f3a n\u00eam (wedge-lock). Kh\u00f4ng d\u1ef1a ho\u00e0n to\u00e0n v\u00e0o long \u0111en v\u00eanh.<br \/>\n&#8211; Tr\u00e1nh k\u1eb9t ren b\u1eb1ng m\u1ee1 ch\u1ed1ng k\u1eb9t v\u00e0 m\u00f4-men si\u1ebft \u0111\u00fang chu\u1ea9n.<\/p>\n<h2 id=\"toc-3-tieu-chuan-quy-cach-kich-thuoc-va-nhan-biet\">Ti\u00eau chu\u1ea9n, quy c\u00e1ch k\u00edch th\u01b0\u1edbc v\u00e0 nh\u1eadn bi\u1ebft<\/h2>\n<p>&#8211; Ti\u00eau chu\u1ea9n c\u01a1 t\u00ednh v\u00e0 m\u00e1c: ISO 3506-1\/-2 (bulong\/\u0111ai \u1ed1c inox). K\u00fd hi\u1ec7u tr\u00ean \u0111\u1ea7u bulong\/th\u00e2n thanh ren th\u01b0\u1eddng c\u00f3 \u201cA2-70\u201d, \u201cA4-80\u201d\u2026<br \/>\n&#8211; Quy c\u00e1ch h\u00ecnh h\u1ecdc ph\u1ed5 bi\u1ebfn:<br \/>\n  &#8211; Bulong l\u1ee5c gi\u00e1c ren su\u1ed1t DIN\/ISO 933; ren l\u1eedng DIN\/ISO 931.<br \/>\n  &#8211; \u0110ai \u1ed1c l\u1ee5c gi\u00e1c DIN\/ISO 934; \u0111ai \u1ed1c m\u0169 DIN 1587; Nyloc DIN 985.<br \/>\n  &#8211; Long \u0111en ph\u1eb3ng DIN 125\/ISO 7089; l\u00f2 xo DIN 127.<br \/>\n  &#8211; Thanh ren DIN 975\/976.<br \/>\n&#8211; Ti\u00eau chu\u1ea9n ASTM c\u00f4ng nghi\u1ec7p n\u1eb7ng: ASTM A193 (stud B8=304, B8M=316), ASTM A194 (\u0111ai \u1ed1c h\u1ee3p chu\u1ea9n).<br \/>\n&#8211; Ren: h\u1ec7 m\u00e9t (M6, M8, M10\u2026 ren b\u01b0\u1edbc chu\u1ea9n) l\u00e0 ph\u1ed5 bi\u1ebfn t\u1ea1i Vi\u1ec7t Nam; UNC\/UNF d\u00f9ng cho m\u00e1y m\u00f3c nh\u1eadp kh\u1ea9u.<\/p>\n<h2 id=\"toc-4-cuong-do-mo-men-siet-va-tranh-ket-ren-galling\">C\u01b0\u1eddng \u0111\u1ed9, m\u00f4-men si\u1ebft v\u00e0 tr\u00e1nh \u201ck\u1eb9t ren\u201d (galling)<\/h2>\n<h3>C\u1ea5p b\u1ec1n v\u00e0 t\u1ea3i si\u1ebft<\/h3>\n<p>&#8211; A2-70: b\u1ec1n k\u00e9o t\u1ed1i thi\u1ec3u ~700 MPa; A4-80 ~800 MPa. Inox c\u00f3 b\u1ec1n k\u00e9o th\u1ea5p h\u01a1n bulong th\u00e9p carbon 8.8 nh\u01b0ng ch\u1ed1ng \u0103n m\u00f2n v\u01b0\u1ee3t tr\u1ed9i.<br \/>\n&#8211; M\u00f4-men si\u1ebft ph\u1ee5 thu\u1ed9c b\u00f4i tr\u01a1n, \u0111\u01b0\u1eddng k\u00ednh, c\u1ea5p b\u1ec1n. C\u00f4ng th\u1ee9c g\u1ea7n \u0111\u00fang: T \u2248 K \u00d7 D \u00d7 F, v\u1edbi K ~0,18\u20130,22 (\u0111\u00e3 b\u00f4i tr\u01a1n), D: \u0111\u01b0\u1eddng k\u00ednh danh ngh\u0129a, F: l\u1ef1c k\u00e9o mong mu\u1ed1n.<br \/>\n&#8211; Khuy\u1ebfn ngh\u1ecb: tham kh\u1ea3o b\u1ea3ng m\u00f4-men si\u1ebft c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t\/ti\u00eau chu\u1ea9n, v\u00e0 lu\u00f4n th\u1eed nghi\u1ec7m th\u1ef1c t\u1ebf cho m\u1ed1i gh\u00e9p quan tr\u1ecdng.<\/p>\n<h3>Ph\u00f2ng ch\u1ed1ng k\u1eb9t ren (galling) \u2013 l\u1ed7i th\u01b0\u1eddng g\u1eb7p v\u1edbi inox<\/h3>\n<p>&#8211; D\u00f9ng m\u1ee1 ch\u1ed1ng k\u1eb9t ch\u1ee9a molybdenum disulfide ho\u1eb7c nickel\/PTFE.<br \/>\n&#8211; Tr\u00e1nh si\u1ebft t\u1ed1c \u0111\u1ed9 cao li\u00ean t\u1ee5c b\u1eb1ng s\u00fang h\u01a1i tr\u00ean inox; si\u1ebft theo nh\u1ecbp, d\u1eebng ng\u1eafn \u0111\u1ec3 t\u1ea3n nhi\u1ec7t.<br \/>\n&#8211; D\u00f9ng ren kh\u00e1c c\u1ea5p dung sai ph\u00f9 h\u1ee3p (bulong 6g v\u1edbi \u0111ai \u1ed1c 6H), tr\u00e1nh b\u1ec1 m\u1eb7t qu\u00e1 th\u00f4 r\u00e1p.<br \/>\n&#8211; Tr\u1ed9n v\u1eadt li\u1ec7u c\u00f3 \u0111\u00f4i ch\u00fat kh\u00e1c nhau (v\u00ed d\u1ee5 A4 bolt v\u1edbi A2 nut) c\u00f3 th\u1ec3 gi\u1ea3m galling, nh\u01b0ng \u01b0u ti\u00ean gi\u1ea3i ph\u00e1p b\u00f4i tr\u01a1n\/ph\u1ee7 b\u1ec1 m\u1eb7t.<\/p>\n<h2 id=\"toc-5-an-mon-dien-hoa-va-cac-luu-y-lap-dat\">\u0102n m\u00f2n \u0111i\u1ec7n h\u00f3a v\u00e0 c\u00e1c l\u01b0u \u00fd l\u1eafp \u0111\u1eb7t<\/h2>\n<p>&#8211; Tr\u00e1nh gh\u00e9p inox v\u1edbi th\u00e9p carbon tr\u1ea7n trong m\u00f4i tr\u01b0\u1eddng \u1ea9m; n\u1ebfu b\u1eaft bu\u1ed9c, d\u00f9ng s\u01a1n\/\u0111\u1ec7m c\u00e1ch \u0111i\u1ec7n v\u00e0 b\u1ecbt k\u00edn k\u1ebd h\u1edf.<br \/>\n&#8211; Khi gh\u00e9p v\u1edbi nh\u00f4m \u1edf mi\u1ec1n bi\u1ec3n, d\u00f9ng long \u0111en nylon\/nh\u1ef1a ho\u1eb7c ph\u1ee7 c\u00e1ch ly \u0111\u1ec3 gi\u1ea3m pin \u0111i\u1ec7n h\u00f3a.<br \/>\n&#8211; Tr\u00e1nh nhi\u1ec5m b\u1ea9n b\u1ec1 m\u1eb7t inox b\u1edfi b\u1ee5i m\u00e0i th\u00e9p carbon (c\u1ef1c k\u1ef3 d\u1ec5 g\u00e2y r\u1ec9 n\u00e2u). D\u00f9ng d\u1ee5ng c\u1ee5 ri\u00eang cho inox, v\u1ec7 sinh sau thi c\u00f4ng.<br \/>\n&#8211; V\u1ec7 sinh \u0111\u1ecbnh k\u1ef3:<br \/>\n  &#8211; \u0110\u00f4 th\u1ecb xa bi\u1ec3n: 3\u20136 th\u00e1ng\/l\u1ea7n v\u1edbi n\u01b0\u1edbc s\u1ea1ch + ch\u1ea5t t\u1ea9y nh\u1eb9 pH trung t\u00ednh.<br \/>\n  &#8211; Ven bi\u1ec3n\/s\u01b0\u01a1ng mu\u1ed1i: 1\u20134 tu\u1ea7n\/l\u1ea7n; r\u1eeda k\u1ef9 khe k\u1eb9p, lau kh\u00f4.<\/p>\n<h2 id=\"toc-6-lua-chon-theo-ngan-sach-va-chi-phi-vong-doi-lcc\">L\u1ef1a ch\u1ecdn theo ng\u00e2n s\u00e1ch v\u00e0 chi ph\u00ed v\u00f2ng \u0111\u1eddi (LCC)<\/h2>\n<p>&#8211; 201 c\u00f3 gi\u00e1 mua th\u1ea5p nh\u1ea5t nh\u01b0ng r\u1ee7i ro \u1ed1\/r\u1ec9 trong m\u00f4i tr\u01b0\u1eddng \u1ea9m m\u1eb7n l\u00e0m t\u0103ng chi ph\u00ed b\u1ea3o tr\u00ec\/thay th\u1ebf.<br \/>\n&#8211; 304 (A2) l\u00e0 l\u1ef1a ch\u1ecdn \u201cchu\u1ea9n\u201d cho \u0111a s\u1ed1 c\u00f4ng tr\u00ecnh n\u1ed9i \u0111\u1ecba; 316 (A4) \u0111\u00e1ng \u0111\u1ea7u t\u01b0 cho ven bi\u1ec3n, b\u1ec3 b\u01a1i v\u00e0 n\u01a1i c\u00f3 clorua\/h\u00f3a ch\u1ea5t.<br \/>\n&#8211; Duplex cho v\u1ecb tr\u00ed c\u1ef1c kh\u1eafc nghi\u1ec7t gi\u00fap k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd nhi\u1ec1u l\u1ea7n, ph\u00f9 h\u1ee3p h\u1ea1ng m\u1ee5c tr\u1ecdng y\u1ebfu ch\u1ecbu kh\u00f3 thay th\u1ebf.<\/p>\n<h2 id=\"toc-7-vi-du-chon-nhanh-theo-ung-dung-tai-viet-nam\">V\u00ed d\u1ee5 ch\u1ecdn nhanh theo \u1ee9ng d\u1ee5ng t\u1ea1i Vi\u1ec7t Nam<\/h2>\n<p>&#8211; Ban c\u00f4ng nh\u00e0 \u1edf t\u1ea1i H\u00e0 N\u1ed9i, xa bi\u1ec3n: bulong A2-70, \u0111ai \u1ed1c DIN 934, long \u0111en ph\u1eb3ng; v\u1ec7 sinh 6 th\u00e1ng\/l\u1ea7n.<br \/>\n&#8211; M\u00e1i che th\u00e9p \u2013 H\u1ea3i Ph\u00f2ng, c\u00e1ch bi\u1ec3n ~1\u20132 km: A4-70 cho to\u00e0n b\u1ed9 \u1ed1c\/bulong; b\u1ecbt k\u00edn k\u1ebd h\u1edf, r\u1eeda n\u01b0\u1edbc ng\u1ecdt h\u00e0ng th\u00e1ng.<br \/>\n&#8211; Trang tr\u1ea1i nu\u00f4i t\u00f4m \u2013 Kh\u00e1nh H\u00f2a (n\u01b0\u1edbc m\u1eb7n, phun s\u00f3ng): thanh ren v\u00e0 ecu Duplex 2205 cho khung ch\u00ednh; ph\u1ee5 ki\u1ec7n c\u00f2n l\u1ea1i t\u1ed1i thi\u1ec3u A4-80.<br \/>\n&#8211; Nh\u00e0 m\u00e1y th\u1ef1c ph\u1ea9m \u2013 B\u1eafc Ninh: d\u00e2y chuy\u1ec1n r\u1eeda n\u01b0\u1edbc mu\u1ed1i lo\u00e3ng: A4-70; ch\u1ecdn b\u1ec1 m\u1eb7t electropolish \u1edf v\u1ecb tr\u00ed v\u1ec7 sinh CIP.<br \/>\n&#8211; B\u1ec3 b\u01a1i trong nh\u00e0 \u2013 \u0110\u00e0 N\u1eb5ng: k\u1ebft c\u1ea5u treo tr\u1ea7n d\u00f9ng Duplex 2205; h\u1ea1ng m\u1ee5c ph\u1ee5 t\u00f9ng A4-80; t\u0103ng th\u00f4ng gi\u00f3, ch\u1ed1ng ng\u01b0ng t\u1ee5.<\/p>\n<h2 id=\"toc-8-faq-ngan\">FAQ ng\u1eafn<\/h2>\n<p>&#8211; Inox 201 c\u00f3 r\u1ec9 kh\u00f4ng? C\u00f3 th\u1ec3, nh\u1ea5t l\u00e0 trong m\u00f4i tr\u01b0\u1eddng \u1ea9m\/clorua; kh\u00f4ng khuy\u1ebfn ngh\u1ecb cho ven bi\u1ec3n\/b\u1ec3 b\u01a1i.<br \/>\n&#8211; A2 v\u00e0 A4 kh\u00e1c g\u00ec? A2 \u2248 304 (\u0111a d\u1ee5ng), A4 \u2248 316 (th\u00eam Mo, ch\u1ed1ng r\u1ed7 clorua t\u1ed1t h\u01a1n). A4 th\u01b0\u1eddng \u0111\u1eaft h\u01a1n nh\u01b0ng b\u1ec1n h\u01a1n \u1edf ven bi\u1ec3n\/h\u00f3a ch\u1ea5t nh\u1eb9.<br \/>\n&#8211; Inox c\u00f3 t\u1eeb t\u00ednh kh\u00f4ng? Austenitic (304\/316) g\u1ea7n nh\u01b0 kh\u00f4ng t\u1eeb t\u00ednh sau \u1ee7; c\u00f3 th\u1ec3 h\u01a1i nhi\u1ec5m t\u1eeb do gia c\u00f4ng ngu\u1ed9i. 410\/430 c\u00f3 t\u1eeb t\u00ednh r\u00f5 r\u1ec7t.<br \/>\n&#8211; C\u00f3 n\u00ean m\u1ea1 k\u1ebdm inox? Th\u01b0\u1eddng kh\u00f4ng; thay v\u00e0o \u0111\u00f3 d\u00f9ng th\u1ee5 \u0111\u1ed9ng h\u00f3a, electropolish ho\u1eb7c ph\u1ee7 PTFE \u0111\u1ec3 gi\u1ea3m ma s\u00e1t\/ch\u1ed1ng b\u00e1m b\u1ea9n.<\/p>\n<h2 id=\"toc-9-nguon-tham-khao\">Ngu\u1ed3n tham kh\u1ea3o<\/h2>\n<p>&#8211; ISO 3506-1\/-2: Mechanical properties of corrosion-resistant stainless steel fasteners (A2, A4, c\u1ea5p b\u1ec1n 50\/70\/80).<br \/>\n&#8211; Nickel Institute \u2013 Guidelines for selection of stainless steels in chloride environments; Stainless steel in architecture and construction.<br \/>\n&#8211; ASSDA (Australian Stainless Steel Development Association) \u2013 H\u01b0\u1edbng d\u1eabn \u201ctea staining\u201d ven bi\u1ec3n v\u00e0 v\u1ec7 sinh b\u1ea3o tr\u00ec inox.<br \/>\n&#8211; British Stainless Steel Association (BSSA) \u2013 Technical resources on galling and fasteners.<br \/>\n&#8211; ASTM A193\/A194 \u2013 Stainless steel studs and nuts for high-temperature\/pressure service.<\/p>\n<h2 id=\"toc-10-ket-luan\">K\u1ebft lu\u1eadn<\/h2>\n<p>&#8211; Ch\u1ecdn bulong \u2013 \u1ed1c v\u00edt \u2013 ecu inox ph\u1ea3i d\u1ef1a v\u00e0o m\u00f4i tr\u01b0\u1eddng: A2-70 cho n\u1ed9i \u0111\u1ecba\/\u0111\u00f4 th\u1ecb; A4-70\/80 cho ven bi\u1ec3n, b\u1ec3 b\u01a1i, h\u00f3a ch\u1ea5t nh\u1eb9; Duplex 2205 cho khu v\u1ef1c m\u1eb7n kh\u1eafc nghi\u1ec7t.<br \/>\n&#8211; L\u1eafp \u0111\u1eb7t \u0111\u00fang (m\u1ee1 ch\u1ed1ng k\u1eb9t, m\u00f4-men si\u1ebft chu\u1ea9n, c\u00e1ch ly \u0111i\u1ec7n h\u00f3a) v\u00e0 v\u1ec7 sinh \u0111\u1ecbnh k\u1ef3 gi\u00fap k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd, t\u1ed1i \u01b0u chi ph\u00ed v\u00f2ng \u0111\u1eddi.<br \/>\n&#8211; Khi ph\u00e2n v\u00e2n, \u01b0u ti\u00ean v\u1eadt li\u1ec7u c\u00f3 bi\u00ean an to\u00e0n cao h\u01a1n (316 thay cho 304) t\u1ea1i Vi\u1ec7t Nam do kh\u00ed h\u1eadu \u1ea9m v\u00e0 \u00f4 nhi\u1ec5m clorua lan r\u1ed9ng.<\/p>\n<p>Li\u00ean h\u1ec7 Inox C\u01b0\u1eddng Th\u1ecbnh \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u01b0 v\u1ea5n ch\u1ecdn \u0111\u00fang lo\u1ea1i bulong \u2013 \u1ed1c v\u00edt \u2013 ecu inox cho d\u1ef1 \u00e1n c\u1ee7a b\u1ea1n v\u00e0 nh\u1eadn b\u00e1o gi\u00e1 t\u1ed1t nh\u1ea5t.<br \/>\nHotline: 0343.417.281<br \/>\nEmail: inoxcongnghiep.cuongthinh@gmail.com<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Gi\u1ea3i th\u00edch bulong, \u1ed1c v\u00edt, ecu inox: m\u00e1c 201\/304\/316\/410, c\u1ea5p b\u1ec1n A2-70\/A4-80, c\u00e1ch ch\u1ecdn theo t\u1eebng m\u00f4i tr\u01b0\u1eddng, m\u1eb9o ch\u1ed1ng k\u1eb9t ren, ti\u00eau chu\u1ea9n ISO 3506.<\/p>\n","protected":false},"author":7,"featured_media":1016,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[23],"tags":[],"class_list":["post-2134","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\/2134","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=2134"}],"version-history":[{"count":0,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/posts\/2134\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/media\/1016"}],"wp:attachment":[{"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/media?parent=2134"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/categories?post=2134"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/inoxcuongthinh.com\/inct\/wp\/v2\/tags?post=2134"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}