{"id":3980,"date":"2026-09-15T23:59:45","date_gmt":"2026-09-15T20:59:45","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3980"},"modified":"2026-09-17T23:06:36","modified_gmt":"2026-09-17T20:06:36","slug":"hastelloy-x-inconel-625-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/hastelloy-x-inconel-625-difference\/","title":{"rendered":"What Is the Difference Between Hastelloy X and Inconel 625?"},"content":{"rendered":"<p><strong>Hastelloy X<\/strong> and <strong>Inconel 625<\/strong> often appear on the same drawing in the hot sections of gas turbines and combustion systems. Both are solid solution alloys and neither requires heat treatment. The difference is in which condition they were optimised for.<\/p>\n<h3>High iron, low molybdenum<\/h3>\n<p>According to our datasheets, Hastelloy X has nickel at <strong>47.5\u201361%<\/strong>, chromium at <strong>20.5\u201323.0%<\/strong>, iron at <strong>17\u201320%<\/strong> and molybdenum at <strong>8.0\u201310.0%<\/strong>. Inconel 625 has nickel at <strong>min 58.0%<\/strong>, chromium 20.0\u201323.0%, iron <strong>max 5.00%<\/strong> and molybdenum 8.00\u201310.0%.<\/p>\n<p>Chromium and molybdenum are almost identical. The decisive difference is in <strong>iron<\/strong>: 17\u201320% in Hastelloy X against below 5% in 625. Iron lowers the cost and contributes to structural stability at high temperature; in exchange it weakens resistance to aqueous corrosion.<\/p>\n<p>The second difference is niobium. Inconel 625 contains <strong>3.15\u20134.15% niobium + tantalum<\/strong>; Hastelloy X contains none. Niobium gives 625 solid solution strength and stability after welding.<\/p>\n<p>The result: Hastelloy X is a <strong>furnace and combustion chamber<\/strong> alloy designed for oxidation resistance and creep strength at temperatures reaching 1200 \u00b0C. Inconel 625 is a far more broadly used alloy that withstands both high temperature and aqueous corrosion.<\/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;\">Hastelloy X<\/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;\">Nickel (Ni)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">47.5 \u2013 61%<\/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;\">20.5 \u2013 23.0%<\/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;\">Iron (Fe)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">17 \u2013 20%<\/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;\">Molybdenum (Mo)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">8.0 \u2013 10.0%<\/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;\">Carbon (C)<\/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;\">max 0.10%<\/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;\">Present<\/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;\">Aluminium (Al)<\/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;\">max 0.40%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Titanium (Ti)<\/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;\">max 0.40%<\/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;\">N06002<\/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;\">W.Nr (DIN\/EN)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">2.4665<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">2.4856<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">EN chemical symbol<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">NiCr22Fe18Mo<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">NiCr22Mo9Nb<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">AMS<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">5536 \u00b7 5754<\/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>Hastelloy X is required<\/strong> \u2014 gas turbine combustion chamber liners, transition ducts, flame holders, industrial furnace muffles and retorts, heat treatment fixtures. Where oxidation and creep resistance at very high temperature come first. If the specification calls out <strong>AMS 5536<\/strong> or <strong>AMS 5754<\/strong>, this is the grade being asked for.<\/p>\n<p><strong>Inconel 625 is required<\/strong> \u2014 marine and chemical equipment, exhaust and fuel systems, flue gas desulphurisation, offshore pipelines, parts where temperature and aqueous corrosion occur together. If there is an aqueous environment, the iron in Hastelloy X becomes a problem.<\/p>\n<h3>Neighbouring alloys<\/h3>\n<p>For precipitation hardening alternatives at high temperature, see our <a href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/inconel-625-inconel-718-difference\/\">Inconel 625 \u2013 718<\/a> and <a href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/inconel-718-waspaloy-difference\/\">Inconel 718 \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\/hastelloy-x\/\">Hastelloy X \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>Hastelloy X is optimised for oxidation and creep at high temperature, Inconel 625 for corrosion and strength.<\/p>\n","protected":false},"author":1,"featured_media":3487,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3980","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 Hastelloy X and Inconel 625? 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