{"id":3983,"date":"2026-09-16T00:02:53","date_gmt":"2026-09-15T21:02:53","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3983"},"modified":"2026-09-17T23:06:33","modified_gmt":"2026-09-17T20:06:33","slug":"haynes-25-l-605-inconel-625-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/16\/haynes-25-l-605-inconel-625-difference\/","title":{"rendered":"What Is the Difference Between Haynes 25 (L-605) and Inconel 625?"},"content":{"rendered":"<p><strong>Haynes 25<\/strong> (also known as <strong>L-605<\/strong>) and <strong>Inconel 625<\/strong> are both solid solution hardened alloys and both work at high temperature. The fundamental difference is what the base metal is: one is <strong>cobalt<\/strong> based, the other <strong>nickel<\/strong> based.<\/p>\n<h3>What does a cobalt matrix bring?<\/h3>\n<p>According to our datasheets, the main element of Haynes 25 is <strong>cobalt<\/strong>; alongside it are <strong>~20% chromium<\/strong>, <strong>~15% nickel<\/strong> and <strong>~10% tungsten<\/strong>. Inconel 625 is nickel based with <strong>min 58% nickel<\/strong>; chromium 20.0\u201323.0%, molybdenum 8.00\u201310.0%, niobium + tantalum 3.15\u20134.15%.<\/p>\n<p>A cobalt matrix has three clear advantages. The first is <strong>temperature<\/strong>: cobalt-based alloys retain their strength at higher temperatures than nickel-based ones. Our datasheet gives Haynes 25 <strong>strength up to 980 \u00b0C<\/strong> and <strong>creep stability up to 815 \u00b0C<\/strong>.<\/p>\n<p>The second is <strong>wear and galling resistance<\/strong>: cobalt alloys are far more resistant to seizing and tearing under sliding contact. The third is <strong>sulphur-bearing environments<\/strong>: cobalt is more resistant to sulphidation corrosion than nickel.<\/p>\n<p>The advantage of Inconel 625 is in aqueous corrosion \u2014 thanks to molybdenum and niobium it is well ahead of Haynes 25 in seawater and acid environments. It is also far more economical and easier to source.<\/p>\n<h3>Comparison in numbers<\/h3>\n<div style=\"overflow-x:auto;border:1px solid #d7dfe4;background:#fff;margin:10px 0 26px;\">\n<table style=\"border-collapse:collapse;width:100%;font-size:15px;\">\n<thead>\n<tr style=\"background:#DD3333;\">\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">PROPERTY<\/th>\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">Haynes 25 (L-605)<\/th>\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">Inconel 625<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Base metal<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">Cobalt<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">Nickel<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Cobalt (Co)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">Balance<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 1.00%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Nickel (Ni)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">~15%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">min 58.0%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Chromium (Cr)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">~20%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">20.0 \u2013 23.0%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Tungsten (W)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">~10%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2014<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Molybdenum (Mo)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2014<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">8.00 \u2013 10.0%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Niobium + Tantalum<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2014<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">3.15 \u2013 4.15%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Iron (Fe)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">Trace<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 5.00%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Tensile strength (room temp.)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">~960 MPa<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2014<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Yield strength (room temp.)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">~400 MPa<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2014<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Service temperature<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">strength up to 980 \u00b0C<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2014<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Creep resistance<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">stable up to 815 \u00b0C<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">\u2014<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Hardening mechanism<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">Solid solution<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">Solid solution<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">UNS<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">R30605<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">N06625<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">AMS \/ ASTM<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">5537 \u00b7 5759 \u00b7 ASTM F90<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">5599 \u00b7 5666 \u00b7 5837<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<p style=\"font-size:13px;color:#6b7a84;margin-top:-16px;\">Values are taken from our product datasheets; section thickness and the applied heat treatment regime change the result.<\/p>\n<h3>Which one, and when?<\/h3>\n<p><strong>Haynes 25 is required<\/strong> \u2014 gas turbine combustion chambers and transition pieces, afterburner components, high-temperature springs, sliding contact surfaces, medical implant and stent applications (ASTM F90 covers that use). Parts carrying load above 900 \u00b0C or exposed to wear.<\/p>\n<p><strong>Inconel 625 is required<\/strong> \u2014 seawater and chemical environment equipment, exhaust and fuel systems, welded structures, offshore pipelines. If there is aqueous corrosion and the temperature is below 900 \u00b0C, 625 is both better and far more economical.<\/p>\n<h3>Neighbouring alloys<\/h3>\n<p>For nickel-based alternatives at high temperature, see our <a href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/hastelloy-x-inconel-625-difference\/\">Hastelloy X \u2013 Inconel 625<\/a> and <a href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/16\/nimonic-80a-waspaloy-difference\/\">Nimonic 80A \u2013 Waspaloy<\/a> comparisons.<\/p>\n<div style=\"border:1px solid #d7dfe4;border-left:4px solid #24BEE5;background:#f7fafb;padding:18px 20px;margin:26px 0;\">\n<p style=\"margin:0 0 10px;font-weight:700;color:#20303c;\">Technical datasheets<\/p>\n<p style=\"margin:0 0 6px;\"><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/haynes-25\/\">Haynes 25 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n<p style=\"margin:0 0 12px;\"><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/inconel-625\/\">Inconel 625 \u2014 chemical composition, mechanical values, standard equivalents<\/a><\/p>\n<p style=\"margin:0;color:#6b7a84;font-size:14px;\">Both grades are supplied to order in round bar, flat bar, plate, sheet, pipe and forged forms. <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/contact\/\">Contact us<\/a> for a quotation.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Haynes 25 is cobalt based and works at higher temperature; Inconel 625 is nickel based with broader corrosion resistance.<\/p>\n","protected":false},"author":1,"featured_media":3497,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3983","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-comparisons"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What Is the Difference Between Haynes 25 (L-605) and Inconel 625? 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