{"id":3951,"date":"2026-09-15T22:32:45","date_gmt":"2026-09-15T19:32:45","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3951"},"modified":"2026-09-24T19:43:50","modified_gmt":"2026-09-24T16:43:50","slug":"aisi-321-aisi-316ti-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-321-aisi-316ti-difference\/","title":{"rendered":"What Is the Difference Between AISI 321 and AISI 316Ti?"},"content":{"rendered":"<p><strong>AISI 321<\/strong> and <strong>AISI 316Ti<\/strong> are two austenitic stainless steels produced on the same principle: both are <strong>stabilised with titanium<\/strong>. The difference between them lies in the grade they are based on \u2014 321 is a 304 derivative, 316Ti a 316 derivative.<\/p>\n<h3>What does stabilisation mean?<\/h3>\n<p>When austenitic stainless steels spend a long time in the 450\u2013850 \u00b0C range, carbon combines with chromium and forms chromium carbides at the grain boundaries. Chromium is depleted in that zone and intergranular corrosion begins. Lowering the carbon (the L grades) is one solution; the second is <strong>adding titanium<\/strong>. Titanium ties up the carbon, chromium stays free and the protective layer is not damaged.<\/p>\n<p>The difference from the L grades is this: low carbon provides protection after welding, but it is not enough if the part is going to work at high temperature <em>continuously<\/em>. Titanium-stabilised grades stay stable under those conditions too. That is why 321 and 316Ti are preferred for exhaust systems, heat exchangers and furnace components.<\/p>\n<h3>What makes the difference: molybdenum<\/h3>\n<p>There is no molybdenum in the composition of AISI 321; chromium is 17.00\u201319.00% and nickel 9.00\u201312.00%. AISI 316Ti contains <strong>2.00\u20132.50% molybdenum<\/strong> and its nickel rises to 10.50\u201313.50%. Molybdenum provides resistance to pitting corrosion in chloride-bearing environments.<\/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;\">AISI 321<\/th>\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">AISI 316Ti<\/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;\">Carbon (C)<\/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;\">Chromium (Cr)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">17.00 \u2013 19.00%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">16.50 \u2013 18.50%<\/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;\">9.00 \u2013 12.00%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">10.50 \u2013 13.50%<\/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;\">2.00 \u2013 2.50%<\/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 0.03%<\/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;\">Tensile strength Rm<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">515 MPa<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">500 \u2013 700 MPa<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Yield strength Rp0.2<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">205 MPa<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">&gt; 200 MPa<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Elongation A50<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">40%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">40 \/ 30%<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Hardness<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 217 HB<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 215 HB<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Thermal conductivity<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">16.1 W\/m\u00b7K<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">15 W\/m\u00b7K<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">Thermal expansion<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">16.6 \u00b5m\/m\u00b7K<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">15.9 \u00d7 10\u207b\u2076\/K<\/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;\">S32100<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">S31635<\/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;\">1.4541<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1.4571<\/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;\">5510 \u00b7 5557 \u00b7 5559 \u00b7 5570 \u00b7 5576 \u00b7 5645<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">5507 \u00b7 5524 \u00b7 5573 \u00b7 5584 \u00b7 5648 \u00b7 5649 \u00b7 5653<\/td>\n<\/tr>\n<tr>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;font-weight:600;color:#20303c;\">ASTM<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">A240 \u00b7 A276 \u00b7 A314 \u00b7 A484<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">A276 \u00b7 A479 \u00b7 A484 \u00b7 A240<\/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>AISI 321 is sufficient<\/strong> \u2014 exhaust manifolds, heat exchanger tubes, furnace and boiler components, hot air lines in aerospace. It is the right choice for high-temperature applications without a chloride load. If the specification calls out <strong>AMS 5510<\/strong> or <strong>AMS 5557<\/strong>, the grade being asked for is 321.<\/p>\n<p><strong>AISI 316Ti is required<\/strong> \u2014 where high temperature and a chloride or acid load occur together: chemical plants, the paper industry, hot lines in marine environments, process equipment.<\/p>\n<h3>Neighbouring grades<\/h3>\n<p>For the low-carbon approach instead of stabilisation, see our <a href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-316-aisi-316l-difference\/\">AISI 316 \u2013 AISI 316L comparison<\/a>; for the effect of molybdenum, see our <a href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-304-aisi-316-difference\/\">AISI 304 \u2013 AISI 316 comparison<\/a>. For higher temperatures there are <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-310\/\">AISI 310<\/a> and <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-314\/\">AISI 314<\/a>.<\/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\/aisi-321\/\">AISI 321 \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\/aisi-316ti\/\">AISI 316Ti \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>AISI 321 and AISI 316Ti are both titanium-stabilised; the difference between them is the molybdenum content.<\/p>\n","protected":false},"author":1,"featured_media":3315,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3951","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 AISI 321 and AISI 316Ti? 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