{"id":3964,"date":"2026-09-15T23:39:44","date_gmt":"2026-09-15T20:39:44","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3964"},"modified":"2026-09-17T23:06:55","modified_gmt":"2026-09-17T20:06:55","slug":"hastelloy-c-276-hastelloy-c-22-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/hastelloy-c-276-hastelloy-c-22-difference\/","title":{"rendered":"What Is the Difference Between Hastelloy C-276 and Hastelloy C-22?"},"content":{"rendered":"<p><strong>Hastelloy C-276<\/strong> and <strong>Hastelloy C-22<\/strong> are the two most widely used members of the nickel\u2013chromium\u2013molybdenum family. Both were developed for the most demanding environments in the chemical industry. The choice between them is made by asking whether the environment is <strong>oxidising or reducing<\/strong>.<\/p>\n<h3>Chromium, or molybdenum?<\/h3>\n<p>According to our datasheets, molybdenum in C-276 is <strong>15\u201317%<\/strong> and chromium <strong>14.5\u201316.5%<\/strong>. In C-22 that balance is reversed: molybdenum falls to <strong>12.5\u201314.5%<\/strong> while chromium rises to <strong>20.0\u201322.5%<\/strong>.<\/p>\n<p>This is not a simple preference but a design decision aimed at two different corrosion mechanisms. <strong>Molybdenum<\/strong> provides protection in reducing environments (hydrochloric acid, sulphuric acid, phosphoric acid). <strong>Chromium<\/strong> is effective in oxidising environments (nitric acid, chlorine-bearing oxidising solutions, wet chlorine gas).<\/p>\n<p>The high chromium of C-22 gives it the wider working window of the two \u2014 it performs reasonably in both oxidising and reducing conditions. C-276 is the stronger on the reducing side. Tungsten is present in both: <strong>3.0\u20134.5%<\/strong> in C-276 and <strong>2.5\u20133.5%<\/strong> in C-22.<\/p>\n<p>Another difference is in iron: <strong>4.0\u20137.0%<\/strong> in C-276 and <strong>2.0\u20136.0%<\/strong> in C-22. C-22 also has tighter impurity limits (phosphorus and sulphur max 0.02%; 0.04% and 0.03% in C-276).<\/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;color:#fff;\">\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 C-276<\/th>\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">Hastelloy C-22<\/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;\">Chromium (Cr)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">14.5 \u2013 16.5%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">20.0 \u2013 22.5%<\/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;\">15 \u2013 17%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">12.5 \u2013 14.5%<\/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;\">3.0 \u2013 4.5%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">2.5 \u2013 3.5%<\/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;\">4.0 \u2013 7.0%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">2.0 \u2013 6.0%<\/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;\">max 2.5%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 2.5%<\/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;\">max 0.01%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.015%<\/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 1.00%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.5%<\/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 0.08%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.08%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Phosphorus (P)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.04%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.02%<\/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 0.03%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.02%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Vanadium (V)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.35%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.35%<\/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;\">N10276<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">N06022<\/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;\">2.4819<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">2.4602<\/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;\">NiMo16Cr15W<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">NiCr21Mo14W<\/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;\">5530 \u00b7 5750<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">5766<\/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 C-276 is preferred<\/strong> \u2014 hydrochloric and sulphuric acid processes, fluids containing sulphur compounds, pulp bleaching, waste treatment, flue gas desulphurisation. Anywhere reducing conditions dominate. If the specification calls out <strong>AMS 5530<\/strong> or <strong>AMS 5750<\/strong>, this is the grade being asked for.<\/p>\n<p><strong>Hastelloy C-22 is required<\/strong> \u2014 processes where oxidising and reducing conditions alternate, nitric + hydrofluoric acid mixtures, wet chlorine environments, pharmaceutical and agrochemical reactors. Where the environment is unknown or variable, C-22 is the safer choice.<\/p>\n<h3>The other members of the family<\/h3>\n<p>There is <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/hastelloy-c-2000\/\">Hastelloy C-2000<\/a>, whose acid resistance is widened further by a copper addition, and <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/hastelloy-b-3\/\">Hastelloy B-3<\/a>, developed for purely reducing environments. For high-temperature applications, <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/hastelloy-x\/\">Hastelloy X<\/a> is 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\/hastelloy-c-276\/\">Hastelloy C-276 \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\/hastelloy-c-22\/\">Hastelloy C-22 \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>C-276 is molybdenum-weighted and C-22 chromium-weighted; one excels in reducing, the other in oxidising environments.<\/p>\n","protected":false},"author":1,"featured_media":3401,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3964","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 C-276 and Hastelloy C-22? 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