{"id":3957,"date":"2026-09-15T23:25:53","date_gmt":"2026-09-15T20:25:53","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3957"},"modified":"2026-09-17T23:07:03","modified_gmt":"2026-09-17T20:07:03","slug":"aisi-430-aisi-304-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-430-aisi-304-difference\/","title":{"rendered":"What Is the Difference Between AISI 430 and AISI 304?"},"content":{"rendered":"<p><strong>AISI 430<\/strong> and <strong>AISI 304<\/strong> represent two different families of stainless steel. From the outside they look the same, but metallurgically they are fundamentally different. The element that separates them is <strong>nickel<\/strong>.<\/p>\n<h3>Ferritic and austenitic<\/h3>\n<p>The composition of AISI 304 contains <strong>8.00\u201310.50% nickel<\/strong>. Nickel keeps the steel in an <strong>austenitic<\/strong> structure at room temperature: that structure is non-magnetic, forms very well and does not become brittle at low temperatures.<\/p>\n<p>In AISI 430 there is practically no nickel (<strong>max 0.50%<\/strong>). The structure is <strong>ferritic<\/strong> \u2014 that is, magnetic, not hardenable, and its deep drawing capability is behind that of 304. In exchange, its coefficient of thermal expansion is much lower (10.4 against 17.2 \u00b5m\/m\u00b7\u00b0C) and its thermal conductivity higher (26.1 against 16.2 W\/m\u00b7K).<\/p>\n<p>There is a difference on the corrosion side as well: the chromium of 430 is close to that of 304 (16\u201318% against 17.50\u201319.50%) but, without nickel, its general corrosion resistance is lower. It causes no trouble indoors and in dry environments; in damp, salty or acidic environments 304 is clearly superior.<\/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 430<\/th>\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">AISI 304<\/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;\">Structure<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">Ferritic (magnetic)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">Austenitic (non-magnetic)<\/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 0.12%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 0.07%<\/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;\">16 \u2013 18%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">17.50 \u2013 19.50%<\/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;\">max 0.50%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">8.00 \u2013 10.50%<\/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;\">483 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;\">260 MPa<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">min 190 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;\">22%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">min 45%<\/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 183 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;\">Density<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">7.75 g\/cm\u00b3<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">8.00 g\/cm\u00b3<\/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;\">26.1 W\/m\u00b7K<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">16.2 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;\">10.4 \u00b5m\/m\u00b7\u00b0C<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">17.2 \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;\">Melting range<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1425 \u2013 1510 \u00b0C<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1450 \u00b0C<\/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;\">S43000<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">S30400<\/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;\">1.4016<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1.4301<\/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;\">5503 \u00b7 5627<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">5511 \u00b7 5513 \u00b7 5560 \u00b7 5565 \u00b7 5639 \u00b7 5647<\/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 430 is sufficient<\/strong> \u2014 white goods panels, interior decoration, lift cabins, kitchen equipment bodies, automotive trim parts, components exposed to heat whose expansion has to stay limited. Since it contains no nickel its cost is markedly lower and it is not affected by swings in the nickel price.<\/p>\n<p><strong>AISI 304 is required<\/strong> \u2014 food and beverage equipment, welded tanks and pipes, exterior fa\u00e7ade applications, parts formed by deep drawing, anything working in a damp environment. Its forming and welding capability is far better than that of 430.<\/p>\n<p>A practical way to tell them apart: <strong>if a magnet sticks it is 430, if it does not it is 304<\/strong>. (Cold-formed 304 can be partly magnetic, so the test should be made on annealed material.)<\/p>\n<h3>Neighbouring grades<\/h3>\n<p>The free-machining version of 430 is <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-430f\/\">AISI 430F<\/a>, and its molybdenum-bearing version is <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-434\/\">AISI 434<\/a>. For the step above 304, 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>.<\/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-430\/\">AISI 430 \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-304\/\">AISI 304 \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 430 is ferritic and magnetic, AISI 304 austenitic; the element that makes the difference is nickel.<\/p>\n","protected":false},"author":1,"featured_media":3387,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3957","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 430 and AISI 304? 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