{"id":3950,"date":"2026-09-15T22:32:34","date_gmt":"2026-09-15T19:32:34","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=3950"},"modified":"2026-09-17T23:07:11","modified_gmt":"2026-09-17T20:07:11","slug":"aisi-304-aisi-304l-difference","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-304-aisi-304l-difference\/","title":{"rendered":"What Is the Difference Between AISI 304 and AISI 304L?"},"content":{"rendered":"<p><strong>AISI 304<\/strong> and <strong>AISI 304L<\/strong> are two versions of the most widely used stainless steel in the world. Their chromium and nickel ranges are exactly the same; the difference is only in carbon. The letter \u201cL\u201d stands for <em>low carbon<\/em>.<\/p>\n<h3>What does the carbon difference do?<\/h3>\n<p>In AISI 304 carbon is <strong>max 0.07%<\/strong>, in AISI 304L <strong>max 0.03%<\/strong>. That difference shows itself during welding.<\/p>\n<p>As the zone beside the weld bead passes through the 450\u2013850 \u00b0C range, carbon combines with chromium and forms <strong>chromium carbides<\/strong> at the grain boundaries. The chromium content falls in that zone and the protective oxide layer on the surface weakens. The result is <strong>intergranular corrosion<\/strong>: a deterioration that begins right beside the weld line and is hard to see with the naked eye.<\/p>\n<p>Because carbon is already very low in 304L, that mechanism is practically switched off. This is why 304L is used for welded parts that cannot be solution annealed afterwards.<\/p>\n<h3>What is given up in return?<\/h3>\n<p>Since carbon contributes to strength, the yield strength of 304L is slightly lower: according to our datasheets the yield strength is <strong>min 190 MPa<\/strong> in 304 and <strong>min 175 MPa<\/strong> in 304L. Tensile strength (500\u2013700 MPa), elongation (min 45%), hardness (max 215 HB) and all thermal properties are identical.<\/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 304<\/th>\n<th style=\"padding:12px 14px;text-align:left;color:#ffffff !important;background:#DD3333;\">AISI 304L<\/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 0.07%<\/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;\">Chromium (Cr)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">17.50 \u2013 19.50%<\/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;\">8.00 \u2013 10.50%<\/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;\">Manganese (Mn)<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 2.0%<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">max 2.0%<\/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;\">Tensile strength Rm<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">500 \u2013 700 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;\">min 190 MPa<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">min 175 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;\">min 45%<\/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 215 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;\">UNS<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">S30400<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">S30403<\/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;\">1.4301<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">1.4307<\/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;\">5511 \u00b7 5513 \u00b7 5560 \u00b7 5565 \u00b7 5639 \u00b7 5647<\/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<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;\">A276 \u00b7 A479 \u00b7 A484<\/td>\n<td style=\"padding:11px 14px;border-bottom:1px solid #d7dfe4;color:#41525c;\">A276 \u00b7 A479 \u00b7 A484<\/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 304 is preferred<\/strong> \u2014 machined components, shafts, fasteners, and parts that are not welded or that can be solution annealed after welding.<\/p>\n<p><strong>AISI 304L is required<\/strong> \u2014 welded tanks, pipes, food and chemical lines, structures welded on site. In thick-section welds, 304L is very nearly the standard choice.<\/p>\n<p>In practice the material is often supplied as <strong>dual certified<\/strong> to both grades; such material satisfies the 304 and the 304L requirement at once.<\/p>\n<h3>The molybdenum-bearing equivalents<\/h3>\n<p>Where chloride-bearing environments are involved, the 316 family is used instead of the 304 family; we covered the difference in our <a href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-304-aisi-316-difference\/\">AISI 304 \u2013 AISI 316 comparison<\/a>, and the 316 \/ 316L distinction <a href=\"https:\/\/www.defencemetal.com\/index.php\/2026\/09\/15\/aisi-316-aisi-316l-difference\/\">in this article<\/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-304\/\">AISI 304 \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-304l\/\">AISI 304L \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>The only difference between AISI 304 and 304L is the carbon content; 304L is preferred for welded structures.<\/p>\n","protected":false},"author":1,"featured_media":3287,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-3950","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 304 and AISI 304L? 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