{"id":4088,"date":"2025-06-02T14:01:36","date_gmt":"2025-06-02T11:01:36","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=4088"},"modified":"2026-09-24T14:35:46","modified_gmt":"2026-09-24T11:35:46","slug":"aisi-904l-1-4539-uns-n08904-super-austenitic-stainless-steel","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2025\/06\/02\/aisi-904l-1-4539-uns-n08904-super-austenitic-stainless-steel\/","title":{"rendered":"AISI 904L (1.4539 \/ UNS N08904) \u2014 Super Austenitic Stainless Steel"},"content":{"rendered":"<p><!-- dm-urun-link --><\/p>\n<div style=\"border:1px solid #d7dfe4;border-left:3px solid #DD3333;background:#F7FAFB;padding:11px 15px;margin:0 0 20px;font-size:14px;line-height:1.55\"><strong style=\"color:#12303f\">We supply AISI 904L.<\/strong> For sizes, standard equivalents, stock and quotations, take a look at the <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-904l\/\"><strong>AISI 904L product page<\/strong><\/a>.<\/div>\n<p><!-- \/dm-urun-link --><\/p>\n<h3>AISI 904L<\/h3>\n<h3><b>AISI 904L Stainless Steel: Where High Corrosion Resistance Meets Mechanical Performance<\/b><\/h3>\n<p class=\"p3\">AISI 904L is a special material belonging to the highly alloyed super <a href=\"https:\/\/en.wikipedia.org\/wiki\/%C3%96stenitik_paslanmaz_%C3%A7elik\">austenitic<\/a> stainless steel class. It is known particularly for its corrosion resistance and its strength in the face of aggressive chemical environments such as sulphuric acid. Thanks to these properties it is widely used in critical sectors such as chemicals, petrochemicals, energy and marine. This article examines the chemical and mechanical properties of AISI 904L, its ASTM and AMS standards, its production processes, its fields of application and its purchasing keywords in detail.<\/p>\n<h3><b>AISI 904L Chemical Composition and Microstructure<\/b><\/h3>\n<p class=\"p3\">AISI 904L stainless steel is produced with approximately the following composition:<\/p>\n<ul>\n<li class=\"p1\" style=\"text-align: left;\">Chromium (Cr): 19\u201323%<\/li>\n<li class=\"p1\" style=\"text-align: left;\">Nickel (Ni): 23\u201328%<\/li>\n<li class=\"p1\" style=\"text-align: left;\">Molybdenum (Mo): 4\u20135%<\/li>\n<li class=\"p1\" style=\"text-align: left;\">Copper (Cu): 1\u20132%<\/li>\n<li class=\"p1\" style=\"text-align: left;\">Carbon (C): max. 0.02% (low carbon)<\/li>\n<li class=\"p1\" style=\"text-align: left;\">Iron (Fe): balance<\/li>\n<\/ul>\n<p class=\"p3\">This special composition makes 904L highly resistant to sulphuric acid and other aggressive chemicals. The high nickel and copper content prevents corrosion and pitting, especially in acidic environments.<\/p>\n<p class=\"p3\">Its microstructure consists entirely of the austenitic phase, which gives the material high ductility and toughness.<\/p>\n<h3><b>AISI 904L <\/b><b style=\"font-size: 16px;\">Mechanical Properties<\/b><\/h3>\n<p class=\"p3\">Although the mechanical properties of AISI 904L vary with the service conditions, in general they are as follows:<\/p>\n<ul>\n<li>\n<p class=\"p1\">Tensile strength: 485\u2013620 MPa<\/p>\n<\/li>\n<li>\n<p class=\"p1\">Yield strength: 170\u2013310 MPa<\/p>\n<\/li>\n<li>\n<p class=\"p1\">Elongation: up to 30%<\/p>\n<\/li>\n<li>\n<p class=\"p1\">Hardness (Rockwell B): 70\u201390 HB<\/p>\n<\/li>\n<\/ul>\n<p class=\"p3\">Thanks to its low carbon content it is an alloy that cannot be hardened by heat treatment, but whose mechanical properties can be improved by cold forming and annealing.<\/p>\n<h3><b>AISI 904L <\/b><b style=\"font-size: 16px;\">ASTM and AMS Standards<\/b><\/h3>\n<p class=\"p3\">AISI 904L stainless steel is defined under various standards:<\/p>\n<ul>\n<li class=\"p1\"><span class=\"s1\"><b>ASTM A240 \/ A240M<\/b><\/span>: among the general standards for stainless steel sheet, plate and strip.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>ASTM A276<\/b><\/span>: covers stainless steel bar, section and billet products.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>UNS N08904<\/b><\/span>: used for the standardised chemical designation of AISI 904L.<\/li>\n<\/ul>\n<p class=\"p3\">These standards set out the chemical composition, mechanical tests, heat treatments and quality control procedures for the material. Conformity of the product with these standards is critically important in purchasing.<\/p>\n<h3><b>AISI 904L <\/b><b>Technical Properties and Performance<\/b><\/h3>\n<p class=\"p3\">AISI 904L stands out particularly for its chemical durability. It shows high resistance to corrosive chemicals such as sulphuric acid, hydrochloric acid and phosphoric acid. It is therefore the preferred material for reactors, piping, valve and pump components in the chemical industry.<\/p>\n<p class=\"p3\">Its corrosion and pitting resistance in environments containing chloride ions, such as seawater, is also higher than that of the other stainless steel types. Thanks to these properties it is also widely used in marine and offshore applications.<\/p>\n<p class=\"p3\">Its mechanical strength allows it to be used with confidence in the construction and machinery sectors.<\/p>\n<h3><b>AISI 904L <\/b><b>Production Process and Machinability<\/b><\/h3>\n<p class=\"p3\">904L is suitable for standard metalworking processes such as casting, rolling, drawing and welding. Because of the high nickel and copper contents in the alloy, however, its machinability is more difficult than that of the classic stainless steels. It requires special cutting tools and suitable cutting parameters.<\/p>\n<p class=\"p3\">Its weldability is good, but annealing after welding is recommended. This reduces the internal stresses that can form in the weld zone and preserves corrosion resistance.<\/p>\n<h3><b>AISI 904L <\/b><b>Fields of Application<\/b><\/h3>\n<ul>\n<li class=\"p1\"><span class=\"s1\"><b>Chemical and petrochemical industry<\/b><\/span>: reactors, tanks, piping and heat exchangers.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Marine<\/b><\/span>: ship components, seawater equipment, offshore platform parts.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Power generation<\/b><\/span>: pipelines and heat exchangers in thermal power plants.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Food and pharmaceutical industry<\/b><\/span>: equipment requiring hygiene and corrosion resistance.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Aerospace<\/b><\/span>: versions supplied to AMS standards for certain aircraft parts working in corrosive environments in particular.<\/li>\n<\/ul>\n<hr>\n<h2><b>Advantages<\/b><\/h2>\n<ul>\n<li class=\"p1\">High corrosion resistance, especially in sulphuric acid and chloride-bearing environments<\/li>\n<li class=\"p1\">Thanks to the low carbon content, there is no deterioration in corrosion resistance after welding<\/li>\n<li class=\"p1\">Superior strength in a super austenitic structure thanks to the high nickel and copper content<\/li>\n<li class=\"p1\">Good mechanical strength and ductility<\/li>\n<li class=\"p1\">A wide field of application and ready availability<\/li>\n<li class=\"p1\">Ease of certified production to ASTM and AMS standards<\/li>\n<\/ul>\n<hr>\n<h2><b>Disadvantages<\/b><\/h2>\n<ul>\n<li class=\"p1\">High production cost and therefore a high selling price<\/li>\n<li class=\"p1\">More difficult machinability compared with other stainless steel types<\/li>\n<li class=\"p1\">The need for annealing after welding, adding cost and time<\/li>\n<li class=\"p1\">Limited durability in some special chemical environments (for example chlorides at high temperature)<\/li>\n<li class=\"p1\">In heavy-duty applications its wear resistance can be lower than that of other stainless steel types<\/li>\n<\/ul>\n<hr>\n<h3><b>Conclusion<\/b><\/h3>\n<p class=\"p3\">AISI 904L is the ideal super austenitic stainless steel for applications requiring high performance in the chemical and petrochemical sectors as well as in the marine and energy fields. Production processes backed by AMS and ASTM standards allow the material to be used reliably on the international market. With its high corrosion resistance, mechanical strength and compatibility with a variety of environments, 904L continues to be an important material in both technical and commercial terms.<\/p>\n<h5>#ASTMA240<br \/>\n#ASTMA276<\/h5>\n<p><!-- dm-tablo --><\/p>\n<div class=\"dm-tablo\" style=\"border:1px solid #d7dfe4;background:#ffffff;margin:24px 0 18px;\">\n<div style=\"background:#DD3333;color:#ffffff;font-size:13px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;padding:10px 12px;line-height:1.35;\">Chemical Composition \u00b7 AISI 904L (1.4539)<\/div>\n<div style=\"padding:2px 12px 8px;\">\n<table id=\"tablepress-17\" class=\"tablepress tablepress-id-17\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Kimyasal \u00d6zellikler <strong><\/th><th class=\"column-2\">Min.<\/th><th class=\"column-3\">Max.<\/th><td class=\"column-4\"><\/td><th class=\"column-5\">Mekanik \u00d6zellikler<\/th><th class=\"column-6\">De\u011fer<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">C<\/td><td class=\"column-2\">-<\/td><td class=\"column-3\">0.02<\/td><td class=\"column-4\"><\/td><td class=\"column-5\">Tensile Strength (MPa)<\/td><td class=\"column-6\">490<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">Mn<\/td><td class=\"column-2\">-<\/td><td class=\"column-3\">2.00<\/td><td class=\"column-4\"><\/td><td class=\"column-5\">Proof Stress (MPa)<\/td><td class=\"column-6\">220<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">Si<\/td><td class=\"column-2\">-<\/td><td class=\"column-3\">1.00<\/td><td class=\"column-4\"><\/td><td class=\"column-5\">Elongation A50 mm<\/td><td class=\"column-6\">36<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">P<\/td><td class=\"column-2\">-<\/td><td class=\"column-3\">0.045<\/td><td class=\"column-4\"><\/td><td class=\"column-5\">Hardness Brinell<\/td><td class=\"column-6\">150 Max HB<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">S<\/td><td class=\"column-2\">-<\/td><td class=\"column-3\">0.035<\/td><td class=\"column-4\"><\/td><td class=\"column-5\">Density<\/td><td class=\"column-6\">7.90 g\/cm3<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">Cr<\/td><td class=\"column-2\">19.00<\/td><td class=\"column-3\">23.00<\/td><td class=\"column-4\"><\/td><td class=\"column-5\">Melting Point<\/td><td class=\"column-6\">1300 - 1390 \u00b0C<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">Mo<\/td><td class=\"column-2\">4.00<\/td><td class=\"column-3\">5.00<\/td><td class=\"column-4\"><\/td><td class=\"column-5\">Modulus of Elasticity<\/td><td class=\"column-6\">190 GPa<\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">Ni<\/td><td class=\"column-2\">23.00<\/td><td class=\"column-3\">28.00<\/td><td class=\"column-4\"><\/td><td class=\"column-5\">Electrical Resistivity<\/td><td class=\"column-6\">952 n\u03a9.m<\/td>\n<\/tr>\n<tr class=\"row-10\">\n\t<td class=\"column-1\">Cu<\/td><td class=\"column-2\">1<\/td><td class=\"column-3\">2<\/td><td class=\"column-4\"><\/td><td class=\"column-5\">Thermal Conductivity<\/td><td class=\"column-6\">11.5 W\/m.K<\/td>\n<\/tr>\n<tr class=\"row-11\">\n\t<td class=\"column-1\"><\/td><td class=\"column-2\"><\/td><td class=\"column-3\"><\/td><td class=\"column-4\"><\/td><td class=\"column-5\">Thermal Expansion<\/td><td class=\"column-6\">15 \u03bcm\/m<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-17 from cache --><\/div>\n<\/div>\n<p><!-- \/dm-tablo --><\/p>\n<p><!-- dm-ic-baglanti --><\/p>\n<div class=\"dm-ic-baglanti\" style=\"margin:28px 0 0;border:1px solid #e0e0e0;border-left:4px solid #DD3333;background:#FAFAFA;padding:16px 18px;\">\n<p style=\"font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:#DD3333;margin:0 0 6px;line-height:1.4;\">We supply this material<\/p>\n<p style=\"margin:0 0 12px;font-size:15px;line-height:1.65;color:#333;\">We supply AISI 904L (1.4539) \u2014 in the size and form required. For stock and pricing:<\/p>\n<p><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-904l\/\" style=\"display:inline-block;color:#ffffff;background:#24BEE5;text-decoration:none;font-weight:600;font-size:14px;padding:10px 17px;line-height:1.2;\">AISI 904L product page \u2192<\/a>\n<\/div>\n<p><!-- \/dm-ic-baglanti --><\/p>\n<p><!-- dm-benzer --><\/p>\n<div class=\"dm-benzer\" style=\"margin:22px 0 0;padding:14px 16px;border:1px solid #e0e0e0;background:#FBFCFD;\">\n<p style=\"font-size:11px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:#9aa3a8;margin:0 0 8px;line-height:1.4;\">Related products<\/p>\n<p style=\"margin:0;font-size:15px;line-height:2;color:#333;\"><a href=\"https:\/\/www.defencemetal.com\/index.php\/2025\/06\/24\/nitronic-50-1-3964-uns-s20910-xm-19-ams-5764-stainless-steel\/\" style=\"color:#24BEE5;font-weight:600;text-decoration:none;\">Nitronic 50<\/a>  \u00b7  <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-303\/\" style=\"color:#24BEE5;font-weight:600;text-decoration:none;\">AISI 303<\/a>  \u00b7  <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-304\/\" style=\"color:#24BEE5;font-weight:600;text-decoration:none;\">AISI 304<\/a>  \u00b7  <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-304l\/\" style=\"color:#24BEE5;font-weight:600;text-decoration:none;\">AISI 304L<\/a>  \u00b7  <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/austenitic-steels\/\" style=\"color:#666;font-weight:600;text-decoration:none;\">Austenitic steels \u2192<\/a><\/p>\n<\/div>\n<p><!-- \/dm-benzer --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>AISI 904L super austenitic stainless steel: chemical composition, mechanical properties, ASTM and AMS standards, and chemical, marine and energy applications.<\/p>\n","protected":false},"author":1,"featured_media":2168,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-4088","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - 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