{"id":3978,"date":"2026-09-15T23:58:20","date_gmt":"2026-09-15T20:58:20","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3978"},"modified":"2026-09-17T23:06:39","modified_gmt":"2026-09-17T20:06:39","slug":"incoloy-800h-incoloy-825-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/incoloy-800h-incoloy-825-difference\/","title":{"rendered":"What Is the Difference Between Incoloy 800H and Incoloy 825?"},"content":{"rendered":"<p><strong>Incoloy 800H<\/strong> and <strong>Incoloy 825<\/strong> are two members of the same brand, but they solve different problems. 800H is a <strong>temperature<\/strong> alloy, 825 a <strong>corrosion<\/strong> alloy.<\/p>\n<h3>Molybdenum and copper, nickel and titanium<\/h3>\n<p>According to our datasheets, 800H has nickel at <strong>30.0\u201335.0%<\/strong>, chromium at <strong>19.0\u201323.0%<\/strong> and iron at <strong>min 39.5%<\/strong>. There is no molybdenum or copper. In exchange, carbon is held <strong>deliberately high<\/strong> in the <em>0.05\u20130.10%<\/em> range and aluminium and titanium are added at <strong>0.15\u20130.60%<\/strong>.<\/p>\n<p>The high carbon forms carbides at the grain boundaries and raises <strong>creep strength<\/strong> \u2014 that is the point where 800H departs from standard 800. Aluminium and titanium form a stable oxide layer on the surface and provide resistance to <strong>carburisation and oxidation<\/strong>.<\/p>\n<p>In Incoloy 825 the picture is different: nickel rises to <strong>38.0\u201346.0%<\/strong>, <strong>2.50\u20133.50% molybdenum<\/strong> and <strong>1.50\u20133.00% copper<\/strong> are added, and carbon is reduced to <strong>max 0.05%<\/strong>. Titanium at <strong>0.60\u20131.20%<\/strong> provides stabilisation.<\/p>\n<p>The high nickel gives resistance to stress corrosion cracking, the molybdenum to pitting corrosion, and the copper to sulphuric acid. The low carbon prevents intergranular corrosion after welding. In short, 825 is an <strong>acid and chloride<\/strong> alloy from end to end.<\/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;\">Incoloy 800H<\/th>\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">Incoloy 825<\/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;\">30.0 \u2013 35.0%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">38.0 \u2013 46.0%<\/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;\">19.0 \u2013 23.0%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">19.5 \u2013 23.5%<\/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;\">min 39.5%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">min 22.0%<\/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;\">2.50 \u2013 3.50%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Copper (Cu)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.75%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1.50 \u2013 3.00%<\/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;\">0.05 \u2013 0.10%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.05%<\/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;\">0.15 \u2013 0.60%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.20%<\/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;\">0.15 \u2013 0.60%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.60 \u2013 1.20%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Ti + Al<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">0.30 \u2013 1.2%<\/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;\">Manganese (Mn)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 1.50%<\/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;\">Silicon (Si)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 1.00%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.50%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Sulphur (S)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.015%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.03%<\/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;\">N08810<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">N08825<\/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;\">1.4958<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">2.4858<\/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;\">X10NiCrAlTi32-20<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">NiCr21Mo<\/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>Incoloy 800H is required<\/strong> \u2014 ethylene and hydrogen production furnace tubes, heat treatment furnace internals, petrochemical reformer tubes, steam superheaters, nuclear steam generator components. Any structure <strong>working continuously above 600 \u00b0C<\/strong>.<\/p>\n<p><strong>Incoloy 825 is required<\/strong> \u2014 sulphuric and phosphoric acid equipment, seawater heat exchangers, oil and gas well equipment (especially \u201csour\u201d service containing H\u2082S), nuclear fuel reprocessing, chemical process tanks. <strong>An aggressive chemical environment at room to moderate temperature<\/strong>.<\/p>\n<p>Using one in place of the other does not work: 800H corrodes rapidly in an acid environment, and 825 cannot deliver creep strength at high temperature.<\/p>\n<h3>Neighbouring alloys<\/h3>\n<p>For the precipitation hardening, higher-strength derivative of 825, see our <a href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/incoloy-825-incoloy-925-difference\/\">Incoloy 825 \u2013 925 comparison<\/a>. For superior oxidation resistance at high temperature, <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/inconel-601\/\">Inconel 601<\/a> and <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/hastelloy-x\/\">Hastelloy X<\/a> are used.<\/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\/incoloy-800h\/\">Incoloy 800H \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\/incoloy-825\/\">Incoloy 825 \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>Incoloy 800H is designed for high-temperature strength, Incoloy 825 for acid corrosion resistance.<\/p>\n","protected":false},"author":1,"featured_media":3481,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3978","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 Incoloy 800H and Incoloy 825? 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