{"id":3693,"date":"2026-09-16T11:21:19","date_gmt":"2026-09-16T08:21:19","guid":{"rendered":"https:\/\/www.defencemetal.com\/index.php\/en\/super-duplex-steels\/"},"modified":"2026-09-24T10:41:02","modified_gmt":"2026-09-24T07:41:02","slug":"super-duplex-steels","status":"publish","type":"page","link":"https:\/\/www.defencemetal.com\/index.php\/en\/super-duplex-steels\/","title":{"rendered":"Super Duplex Stainless Steels"},"content":{"rendered":"<p><!-- dm-ara --><\/p>\n<div data-dmara=\"1\" style=\"border:1px solid #d7dfe4;background:#ffffff;margin:0 0 22px;padding:14px 16px;position:relative;\">\n<div style=\"font-size:10.5px;letter-spacing:.09em;text-transform:uppercase;color:#6b8091;font-weight:600;margin-bottom:9px;\">Search within this group<\/div>\n<p><input type=\"text\" data-dmara-in=\"1\" autocomplete=\"off\" placeholder=\"Alloy name, UNS or W.-Nr. \u2014 e.g. 625, N06625, 2.4856\" style=\"width:100%;box-sizing:border-box;padding:11px 13px;font-size:15px;border:1px solid #c9d5dc;background:#F7FAFB;color:#12303f;outline:none;\"><\/p>\n<div data-dmara-say=\"1\" style=\"font-size:12px;color:#7b8f9b;margin:8px 0 10px;\">3 alloys<\/div>\n<div data-dmara-lst=\"1\"><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-f53\/\" data-dmara-k=\"aisi f53 uns s32750 w.nr. 1.4410 x2crnimon25-7-4\" style=\"display:block;padding:9px 12px;border:1px solid #eceff1;background:#F7FAFB;margin:0 0 6px 0;text-decoration:none;color:#12303f;font-size:14px;line-height:1.45;\"><strong>AISI F53<\/strong><span style=\"font-size:12px;color:#7b8f9b;display:block;margin-top:2px;\">UNS S32750 \u00b7 W.Nr. 1.4410 \u00b7 X2CrNiMoN25-7-4<\/span><\/a><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-f55\/\" data-dmara-k=\"aisi f55 uns s32760 w.nr. 1.4501 x2crnimocuwn25-7-4\" style=\"display:block;padding:9px 12px;border:1px solid #eceff1;background:#F7FAFB;margin:0 0 6px 0;text-decoration:none;color:#12303f;font-size:14px;line-height:1.45;\"><strong>AISI F55<\/strong><span style=\"font-size:12px;color:#7b8f9b;display:block;margin-top:2px;\">UNS S32760 \u00b7 W.Nr. 1.4501 \u00b7 X2CrNiMoCuWN25-7-4<\/span><\/a><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-f255\/\" data-dmara-k=\"aisi f255 uns s32550 w.nr. 1.4507\" style=\"display:block;padding:9px 12px;border:1px solid #eceff1;background:#F7FAFB;margin:0 0 6px 0;text-decoration:none;color:#12303f;font-size:14px;line-height:1.45;\"><strong>AISI F255<\/strong><span style=\"font-size:12px;color:#7b8f9b;display:block;margin-top:2px;\">UNS S32550 \u00b7 W.Nr. 1.4507<\/span><\/a><\/div>\n<div data-dmara-yok=\"1\" style=\"display:none;padding:10px 12px;font-size:13.5px;color:#5b7180;background:#F7FAFB;border:1px solid #eceff1;\">No match on this page. Use the magnifier at the top to search the whole site.<\/div>\n<\/div>\n<p><script>(function(){function kf(s){s=String(s);s=s.split(\"I\").join(\"\u0131\");s=s.split(\"\u0130\").join(\"i\");s=s.toLowerCase();s=s.split(\"\u015f\").join(\"s\");s=s.split(\"\u011f\").join(\"g\");s=s.split(\"\u00fc\").join(\"u\");s=s.split(\"\u00f6\").join(\"o\");s=s.split(\"\u00e7\").join(\"c\");s=s.split(\"\u0131\").join(\"i\");return s;}function kur(kutu){var inp=kutu.querySelector(\"[data-dmara-in]\");if(!inp){return;}var lst=kutu.querySelector(\"[data-dmara-lst]\");var yok=kutu.querySelector(\"[data-dmara-yok]\");var say=kutu.querySelector(\"[data-dmara-say]\");var sat=lst.querySelectorAll(\"[data-dmara-k]\");var tam=sat.length;var bs=say?say.textContent.replace(\/^[0-9]+\\s*\/,\"\"):\"\";function calis(){var q=kf(inp.value).replace(\/\\s+\/g,\" \").replace(\/^\\s|\\s$\/g,\"\");var n=0;Array.prototype.forEach.call(sat,function(el){var g=true;if(q!==\"\"){if(el.getAttribute(\"data-dmara-k\").indexOf(q)===-1){g=false;}}el.style.display=g?\"block\":\"none\";if(g){n=n+1;}});if(yok){yok.style.display=(n===0)?\"block\":\"none\";}if(say){say.textContent=n+\" \"+bs;}}inp.addEventListener(\"input\",calis);inp.addEventListener(\"keydown\",function(e){if(e.key===\"Escape\"){inp.value=\"\";calis();}});calis();}function init(){var l=document.querySelectorAll(\"[data-dmara]\");Array.prototype.forEach.call(l,kur);}if(document.readyState===\"loading\"){document.addEventListener(\"DOMContentLoaded\",init);}else{init();}})();<\/script><!-- \/dm-ara --><\/p>\n<h3>SUPER DUPLEX STAINLESS STEELS<\/h3>\n<p>Super duplex steels are the top class of the duplex family. They are two-phase stainless grades in which the chromium, molybdenum and nitrogen contents have been raised so that the pitting resistance equivalent number (PREN) exceeds 40.<\/p>\n<p>Both their strength and their chloride resistance are higher than those of the standard duplex steels. They show superior performance against pitting, crevice and stress corrosion cracking in hot seawater, in acidic well fluids and in chloride-bearing process environments.<\/p>\n<p>Because of their high alloy content, machining and welding them demand more care, and control of phase balance and heat input during welding is critically important. Offshore platforms, seawater systems, petrochemical equipment and pump and valve bodies are the main applications.<\/p>\n<p><strong>Choosing a grade.<\/strong> The most widely used of the super duplex grades, AISI F53 (1.4410), is the standard choice in seawater and offshore applications. AISI F55 (1.4501), which provides additional resistance in more aggressive environments thanks to its tungsten and copper additions, is used particularly in hot seawater and acidic fluids. AISI F255 (1.4507) offers a balanced alternative between standard duplex and super duplex.<\/p>\n<h5>OUR SUPER DUPLEX STAINLESS STEEL GRADES<\/h5>\n<ul>\n<li><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-f53\/\">AISI F53 \/ (1.4410)<\/a><\/li>\n<li><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-f55\/\">AISI F55 \/ (1.4501)<\/a><\/li>\n<li><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-f255\/\">AISI F255 \/ (1.4507)<\/a><\/li>\n<\/ul>\n<p>Tell us the chloride, temperature and pressure conditions of your application and we will identify the right grade together \u2014 <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/contact\/\">contact us<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Search within this group 3 alloys AISI F53UNS S32750 \u00b7 W.Nr. 1.4410 \u00b7 X2CrNiMoN25-7-4AISI F55UNS S32760 \u00b7 W.Nr. 1.4501 \u00b7 X2CrNiMoCuWN25-7-4AISI F255UNS S32550 \u00b7 W.Nr. 1.4507 No match on this page. Use the magnifier at the top to search the whole site. SUPER DUPLEX STAINLESS STEELS Super duplex steels are the top class of the &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/super-duplex-steels\/\" class=\"more-link\"><span class=\"screen-reader-text\"> &#8220;Super Duplex Stainless Steels&#8221;<\/span>devam\u0131n\u0131 oku<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3526,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_title":"Super Duplex Stainless Steels | Defence Metal","_yoast_wpseo_metadesc":"Super duplex stainless steel grades: AISI F53 (1.4410), AISI F55 (1.4501) and AISI F255 (1.4507), with PREN above 40 for seawater and offshore service.","inspiro_hide_title":false,"inspiro_hide_featured_image":false,"footnotes":""},"dm_sektor":[],"class_list":["post-3693","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - 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