{"id":1042,"date":"2026-04-22T03:37:42","date_gmt":"2026-04-22T07:37:42","guid":{"rendered":"https:\/\/www.songhaiflange.com\/?p=1042"},"modified":"2026-04-22T20:20:45","modified_gmt":"2026-04-23T00:20:45","slug":"duplex-stainless-steel-flanges-2205-vs-2507-super-duplex-applications","status":"publish","type":"post","link":"https:\/\/www.songhaiflange.com\/vi\/2026\/04\/22\/duplex-stainless-steel-flanges-2205-vs-2507-super-duplex-applications\/","title":{"rendered":"\u1ed0ng n\u1ed1i th\u00e9p kh\u00f4ng g\u1ec9 hai pha 2205 so v\u1edbi 2507: \u1ee8ng d\u1ee5ng c\u1ee7a th\u00e9p kh\u00f4ng g\u1ec9 si\u00eau hai pha"},"content":{"rendered":"<h2>Duplex Stainless Steel Flanges Guide<\/h2>\n<p>Duplex stainless steels combine the best properties of austenitic and ferritic stainless steels, offering superior strength and corrosion resistance for demanding applications.<\/p>\n<h3>What is Duplex Stainless Steel<\/h3>\n<p>Duplex stainless steel has a two-phase microstructure consisting of approximately 50% austenite and 50% ferrite. This unique structure provides:<\/p>\n<ul>\n<li>Higher strength than 304\/316 austenitic steels<\/li>\n<li>Excellent chloride stress corrosion cracking resistance<\/li>\n<li>Good weldability and formability<\/li>\n<li>Cost-effective alternative to high-nickel alloys<\/li>\n<\/ul>\n<h3>2205 Duplex (UNS S32205\/S31803)<\/h3>\n<h4>Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc<\/h4>\n<ul>\n<li>Chromium: 21-23%<\/li>\n<li>Nickel: 4.5-6.5%<\/li>\n<li>Molybdenum: 2.5-3.5%<\/li>\n<li>Nitrogen: 0.08-0.20%<\/li>\n<\/ul>\n<h4>Key Properties<\/h4>\n<ul>\n<li>Yield Strength: 450 MPa (2x higher than 316)<\/li>\n<li>Pitting Resistance Equivalent (PREN): 32-38<\/li>\n<li>Excellent chloride stress corrosion cracking resistance<\/li>\n<li>Good fatigue and wear resistance<\/li>\n<\/ul>\n<h4>C\u00e1c \u1ee9ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/h4>\n<ul>\n<li>Oil and gas production equipment<\/li>\n<li>Chemical tankers and process vessels<\/li>\n<li>Nh\u00e0 m\u00e1y kh\u1eed mu\u1ed1i<\/li>\n<li>Pulp and paper industry<\/li>\n<li>Flue gas desulfurization systems<\/li>\n<\/ul>\n<h3>2507 Super Duplex (UNS S32750)<\/h3>\n<h4>Th\u00e0nh ph\u1ea7n h\u00f3a h\u1ecdc<\/h4>\n<ul>\n<li>Chromium: 24-26%<\/li>\n<li>Nickel: 6-8%<\/li>\n<li>Molybdenum: 3-5%<\/li>\n<li>Nitrogen: 0.24-0.32%<\/li>\n<\/ul>\n<h4>Key Properties<\/h4>\n<ul>\n<li>Yield Strength: 550 MPa<\/li>\n<li>Pitting Resistance Equivalent (PREN): 40-45<\/li>\n<li>Superior chloride pitting and crevice corrosion resistance<\/li>\n<li>Excellent mechanical properties at elevated temperatures<\/li>\n<\/ul>\n<h4>C\u00e1c \u1ee9ng d\u1ee5ng \u0111i\u1ec3n h\u00ecnh<\/h4>\n<ul>\n<li>C\u00e1c gi\u00e0n khoan d\u1ea7u kh\u00ed ngo\u00e0i kh\u01a1i<\/li>\n<li>H\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t b\u1eb1ng n\u01b0\u1edbc bi\u1ec3n<\/li>\n<li>Chemical processing with aggressive media<\/li>\n<li>Marine equipment and shipbuilding<\/li>\n<li>Heat exchangers in corrosive environments<\/li>\n<\/ul>\n<h3>B\u1ea3ng so s\u00e1nh<\/h3>\n<table>\n<tr>\n<th>Property<\/th>\n<th>316L<\/th>\n<th>2205<\/th>\n<th>2507<\/th>\n<\/tr>\n<tr>\n<td>Yield Strength (MPa)<\/td>\n<td>205<\/td>\n<td>450<\/td>\n<td>550<\/td>\n<\/tr>\n<tr>\n<td>Tensile Strength (MPa)<\/td>\n<td>515<\/td>\n<td>650<\/td>\n<td>800<\/td>\n<\/tr>\n<tr>\n<td>PREN Number<\/td>\n<td>24-26<\/td>\n<td>32-38<\/td>\n<td>40-45<\/td>\n<\/tr>\n<tr>\n<td>Cost Index<\/td>\n<td>1.0<\/td>\n<td>1.3-1.5<\/td>\n<td>1.8-2.2<\/td>\n<\/tr>\n<\/table>\n<h3>Advantages Over Austenitic Steels<\/h3>\n<ol>\n<li><strong>Higher Strength:<\/strong> Allows thinner sections and weight reduction<\/li>\n<li><strong>Better Corrosion Resistance:<\/strong> Especially in chloride environments<\/li>\n<li><strong>Stress Corrosion Cracking:<\/strong> Superior resistance to SCC<\/li>\n<li><strong>Cost Effective:<\/strong> Lower lifecycle cost despite higher initial price<\/li>\n<\/ol>\n<h3>Fabrication Considerations<\/h3>\n<ul>\n<li>Requires controlled heat input during welding<\/li>\n<li>Post-weld heat treatment may be necessary<\/li>\n<li>Avoid contamination with carbon steel tools<\/li>\n<li>Use duplex-compatible filler materials<\/li>\n<\/ul>\n<h3>Ti\u00eau chu\u1ea9n v\u00e0 Th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt<\/h3>\n<ul>\n<li>ASTM A182: F51 (2205), F53 (2507)<\/li>\n<li>ASTM A479: Bar and billet<\/li>\n<li>NACE MR0175: Sour service approved<\/li>\n<li>ASME B16.5: Ti\u00eau chu\u1ea9n k\u00edch th\u01b0\u1edbc<\/li>\n<\/ul>\n<p>Duplex stainless steel flanges offer an optimal balance of performance and cost for challenging corrosive environments where 316 is inadequate but high-nickel alloys are too expensive.<\/p>\n<p><strong>WhatsApp:<\/strong>\u00a0+86-18658777855<br \/>\n<strong>Email:<\/strong>\u00a01007788887@qq.com<br \/>\n<a href=\"https:\/\/www.720yun.com\/vr\/a6ajt7ynrw0\" target=\"_blank\" rel=\"noopener\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-884\" src=\"http:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4.webp\" alt=\"\" width=\"1290\" height=\"2317\" title=\"\" srcset=\"https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4.webp 1290w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-167x300.webp 167w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-570x1024.webp 570w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-768x1379.webp 768w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-855x1536.webp 855w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-1140x2048.webp 1140w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-7x12.webp 7w, https:\/\/www.songhaiflange.com\/wp-content\/uploads\/2026\/04\/4-416x747.webp 416w\" sizes=\"auto, (max-width: 1290px) 100vw, 1290px\" \/><\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Duplex Stainless Steel Flanges Guide Duplex stainless steels combine the best properties of austenitic and ferritic stainless steels, offering superior strength and corrosion resistance for demanding applications. What is Duplex Stainless Steel Duplex stainless steel has a two-phase microstructure consisting of approximately 50% austenite and 50% ferrite. This unique structure provides: Higher strength than 304\/316 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[66,80,78,70],"class_list":["post-1042","post","type-post","status-publish","format-standard","hentry","category-blog","tag-flange","tag-forged","tag-stainless","tag-standard"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/posts\/1042","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/comments?post=1042"}],"version-history":[{"count":2,"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/posts\/1042\/revisions"}],"predecessor-version":[{"id":1053,"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/posts\/1042\/revisions\/1053"}],"wp:attachment":[{"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/media?parent=1042"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/categories?post=1042"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.songhaiflange.com\/vi\/wp-json\/wp\/v2\/tags?post=1042"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}