{"id":4098,"date":"2025-06-20T16:57:24","date_gmt":"2025-06-20T13:57:24","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=4098"},"modified":"2026-09-17T23:07:56","modified_gmt":"2026-09-17T20:07:56","slug":"aisi-440c-1-4125-uns-s44004-ams-5618-ams-5630-ams-5880-stainless-steel","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2025\/06\/20\/aisi-440c-1-4125-uns-s44004-ams-5618-ams-5630-ams-5880-stainless-steel\/","title":{"rendered":"AISI 440C (1.4125 \/ UNS S44004) \u2014 AMS 5618 \/ AMS 5630 \/ AMS 5880 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 440C.<\/strong> For dimensions, standard equivalents, stock and quotations, take a look at the <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-440c\/\"><strong>AISI 440C product page<\/strong><\/a>.<\/div>\n<p><!-- \/dm-urun-link --><\/p>\n<h3><b>AISI 440C<\/b><\/h3>\n<h3><b>AISI 440C Stainless Steel: A Martensitic Alloy Designed Specifically for High Hardness and Wear Resistance<\/b><\/h3>\n<p class=\"p3\"><span class=\"s2\"><b>AISI 440C<\/b><\/span> is a stainless steel grade with a high carbon content, a <a href=\"https:\/\/en.wikipedia.org\/wiki\/Martensitik_paslanmaz_%C3%A7elik#:~:text=Martensitik%20paslanmaz%20%C3%A7elik%2C%20martensit%20i%C3%A7,olup%20ferritik%20paslanmaz%20%C3%A7eliklere%20benzerler.\">martensitic<\/a> structure, resistance to corrosion and extremely high durability against wear. Unlike most conventional stainless steels, this alloy stands out particularly in applications requiring <span class=\"s2\"><b>hardness<\/b><\/span>, <span class=\"s2\"><b>wear resistance<\/b><\/span> and <span class=\"s2\"><b>surface quality<\/b><\/span>. At the same time, with its <span class=\"s2\"><b>hardness that can exceed 60 HRC<\/b><\/span> when heat treated, it is preferred in engineering fields demanding high performance.<\/p>\n<p class=\"p3\">In this article the chemical and mechanical properties of AISI 440C, its compliance with international norms, its application areas, its advantages and its disadvantages will be addressed at a technical level; terms that may be important for purchasing decisions will be included naturally.<\/p>\n<hr>\n<h3><b>AISI 440C Chemical Composition and Microstructural Properties<\/b><\/h3>\n<p class=\"p3\">AISI 440C is one of the members of the <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/martensitic-steels\/\">martensitic stainless<\/a> steel class with the highest carbon content. This high carbon ratio gives the steel extraordinary hardness, especially after heat treatment.<\/p>\n<p class=\"p4\"><b>Its typical chemical composition:<\/b><b><\/b><\/p>\n<ul>\n<li class=\"p1\"><span class=\"s1\"><b>Carbon (C)<\/b><\/span>: 0.95% \u2013 1.20%<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Chromium (Cr)<\/b><\/span>: 16.0% \u2013 18.0%<\/li>\n<li class=\"p1\"><b>Manganese (Mn)<\/b><span class=\"s1\">: Max. 1.0%<\/span><\/li>\n<li class=\"p1\"><b>Silicon (Si)<\/b><span class=\"s1\">: Max. 1.0%<\/span><\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Molybdenum (Mo)<\/b><\/span>: Max. 0.75%<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Phosphorus (P)<\/b><\/span>: Max. 0.04%<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Sulphur (S)<\/b><\/span>: Max. 0.03%<\/li>\n<\/ul>\n<p class=\"p3\">While the high carbon amount offers a great advantage especially in applications that call for a hard surface, the chromium content provides a medium level of corrosion resistance. The essential success of this alloy, however, is that it shows superior performance in abrasive environments while preserving its surface hardness.<\/p>\n<hr>\n<h3><b>AISI 440C Heat Treatment and Mechanical Properties<\/b><\/h3>\n<p class=\"p3\">AISI 440C is one of the rare stainless steel grades that can be hardened with suitable heat treatment up to a level of <span class=\"s2\"><b>maximum 60-62 HRC<\/b><\/span>. For this reason expressions such as &#8220;AISI 440C heat treated&#8221; or &#8220;440C hardened stainless round bar&#8221; play an important role in defining technical requirements during the purchasing process.<\/p>\n<p class=\"p4\"><b>Typical heat treatment parameters:<\/b><b><\/b><\/p>\n<ul>\n<li class=\"p1\"><b>Austenitising temperature<\/b><span class=\"s1\">: 1010 \u2013 1065 \u00b0C<\/span><\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Cooling medium<\/b><\/span>: Air or oil<\/li>\n<li class=\"p1\"><b>Tempering temperature<\/b><span class=\"s1\">: 150 \u2013 250 \u00b0C<\/span><\/li>\n<\/ul>\n<p class=\"p4\"><b>Mechanical properties after heat treatment:<\/b><b><\/b><\/p>\n<ul>\n<li class=\"p1\"><b>Tensile strength (UTS)<\/b><span class=\"s1\">: 760 \u2013 1950 MPa<\/span><\/li>\n<li class=\"p1\"><b>Yield strength (0.2% offset)<\/b><span class=\"s1\">: 450 \u2013 1700 MPa<\/span><\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Hardness<\/b><\/span>: 58 \u2013 62 HRC<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Elongation<\/b><\/span>: 2% \u2013 5% (low because of the brittle structure)<\/li>\n<li class=\"p1\"><b>Wear resistance<\/b><span class=\"s1\">: Very high<\/span><\/li>\n<\/ul>\n<p class=\"p3\">These properties make AISI 440C ideal for applications such as mould parts, ball bearings, blades and valve components that demand high precision and surface strength.<\/p>\n<hr>\n<h3><b>ASTM, AMS and Other International Standards<\/b><\/h3>\n<p class=\"p3\">AISI 440C stainless steel has been defined in various industry standards. Compliance with these norms is of vital importance for material supply and quality control.<\/p>\n<p class=\"p4\"><b>ASTM Standards:<\/b><b><\/b><\/p>\n<ul>\n<li class=\"p1\"><span class=\"s1\"><b>ASTM A276<\/b><\/span> \u2013 Bar and section products<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>ASTM A479<\/b><\/span> \u2013 Bar products for pressure vessels<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>ASTM A314<\/b><\/span> \u2013 General purpose stainless bars<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>ASTM A582<\/b><\/span> \u2013 Pressed bar products for tool parts<\/li>\n<\/ul>\n<p class=\"p4\"><b>AMS Standards:<\/b><b><\/b><\/p>\n<ul>\n<li class=\"p1\"><span class=\"s1\"><b>AMS 5630<\/b><\/span> \u2013 AISI 440C bar products in the annealed condition<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>AMS 5880<\/b><\/span> \u2013 Hardened 440C steels for use in aircraft structures<\/li>\n<\/ul>\n<p class=\"p4\"><b>DIN \/ EN Equivalent:<\/b><b><\/b><\/p>\n<ul>\n<li class=\"p1\"><b>DIN 1.4125 \/ X105CrMo17<\/b><\/li>\n<li class=\"p1\"><b><\/b><span class=\"s1\"><b>EN 10088-1<\/b><\/span> compliant with the standard<\/li>\n<\/ul>\n<p class=\"p3\">These standards are important for quality assurance, especially in sectors such as <span class=\"s2\"><b>aerospace, the defence industry, precision engineering and automotive<\/b><\/span>. Technical expressions such as &#8220;AMS 5630 440C bar&#8221; or &#8220;ASTM A276 440C shaft&#8221; frequently appear in project and purchasing documents.<\/p>\n<hr>\n<h3><b>Areas of Use of AISI 440C<\/b><\/h3>\n<p class=\"p3\">The <span class=\"s2\"><b>high surface hardness and wear resistance<\/b><\/span> of AISI 440C make it indispensable particularly in the following sectors:<\/p>\n<ul>\n<li class=\"p4\"><b>Bearing and Journal Systems: <\/b>It is preferred in ball bearings, roller bearings and precision rotating elements, in systems that both operate under mechanical load and demand low friction.<\/li>\n<li class=\"p4\"><b>Cutting Tools and Industrial Blades: <\/b>Industrial blades cutting metal, plastic and paper benefit from the high hardness and edge retention capability of 440C.<\/li>\n<li class=\"p4\"><b>Mould and Forming Parts: <\/b>Companies seeking material with high surface strength for injection moulds, press moulds and forming equipment generally search for &#8220;440C mould steel price&#8221;.<\/li>\n<li class=\"p4\"><b>Aerospace and Defence Industry: <\/b>AMS certified 440C products are preferred for parts with precise tolerances that carry high loads (shafts, pins, valves).<\/li>\n<li class=\"p4\"><b>Food Processing and Medical Instruments: <\/b>Thanks to its reasonable resistance to rusting and its excellent edge sharpness, it is used in blades and sterilisable surgical equipment.<\/li>\n<\/ul>\n<hr>\n<h3><b>Advantages and Disadvantages<\/b><\/h3>\n<p class=\"p4\"><b>Advantages:<\/b><b><\/b><\/p>\n<ul>\n<li class=\"p1\">Extraordinary wear resistance with hardness above 60 HRC<\/li>\n<li class=\"p1\">Excellent surface strength through heat treatment<\/li>\n<li class=\"p1\">Medium level corrosion resistance<\/li>\n<li class=\"p1\">An aesthetic surface can be obtained thanks to its polishability<\/li>\n<li class=\"p1\">It can be machined with very low deformation<\/li>\n<\/ul>\n<p class=\"p4\"><b>Disadvantages:<\/b><b><\/b><\/p>\n<ul>\n<li class=\"p1\">Because of its brittle structure it is not suitable for impact loads<\/li>\n<li class=\"p1\">Its weldability is low<\/li>\n<li class=\"p1\">Its ductility is quite limited (especially in the hardened condition)<\/li>\n<li class=\"p1\">Risk of pitting corrosion in chlorinated environments<\/li>\n<li class=\"p1\">It may cause tool wear in deep cutting operations<\/li>\n<\/ul>\n<hr>\n<h3><b>Purchasing and Logistics Criteria<\/b><\/h3>\n<p class=\"p3\">In the commercial market AISI 440C is generally supplied in the <span class=\"s2\"><b>annealed<\/b><\/span>, <span class=\"s2\"><b>hardened<\/b><\/span> or <span class=\"s2\"><b>semi-machined<\/b><\/span> condition as round bar, flat bar or plate. <span class=\"s2\"><b>In import processes<\/b><\/span> it is generally assessed under <span class=\"s2\"><b>HS Code 7222.20<\/b><\/span> and a <span class=\"s2\"><b>TSE certificate or an EN 10204 3.1 certificate<\/b><\/span> may be requested.<\/p>\n<hr>\n<h3><b>Conclusion<\/b><\/h3>\n<p class=\"p3\"><span class=\"s2\"><b>AISI 440C<\/b><\/span> is one of the hardest and most wear resistant material grades within the martensitic stainless steel family. However, this hardness and strength make it suitable only for certain applications. In parts requiring high surface strength, such as precision bearings, cutting tools and moulds, it offers long-life and reliable solutions with the correct heat treatment and careful machining.<\/p>\n<p class=\"p3\">In project and purchasing processes, seeking compliance with the <span class=\"s2\"><b>ASTM A276, AMS 5630 or DIN 1.4125<\/b><\/span> standards provides a safe investment in terms of quality and performance.<\/p>\n<h5 class=\"p3\"><span class=\"s1\"><b>#ASTMA276<br \/>\n<\/b><\/span><span class=\"s1\"><b>#ASTMA479<br \/>\n#<\/b><\/span><span class=\"s1\"><b>ASTMA314<br \/>\n#<\/b><\/span><span class=\"s1\"><b>ASTMA582<br \/>\n#<\/b><\/span><span class=\"s1\"><b>AMS5630<br \/>\n#<\/b><\/span><span class=\"s1\"><b>AMS5880<br \/>\n#<\/b><\/span><b>DIN1.4125<br \/>\n<span class=\"s1\">#<\/span>X105CrMo17<br \/>\n<span class=\"s1\">#<\/span><\/b><b><\/b><span class=\"s1\"><b>EN10088<\/b><\/span><\/h5>\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 440C (1.4125) \u2014 to AMS 5630, AMS 5618 standards, in the dimensions and forms required. Contact us for stock availability and pricing.<\/p>\n<p><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/contact\/\" style=\"display:inline-block;color:#ffffff;background:#24BEE5;text-decoration:none;font-weight:600;font-size:14px;padding:10px 17px;line-height:1.2;\">Request a quotation \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;\">Similar 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\/25\/4340-var-uns-g43400-ams-6414-ams-6454-ams-6484-high-strength-steel\/\" style=\"color:#24BEE5;font-weight:600;text-decoration:none;\">4340 VAR<\/a>  \u00b7  <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-410\/\" style=\"color:#24BEE5;font-weight:600;text-decoration:none;\">AISI 410<\/a>  \u00b7  <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-415\/\" style=\"color:#24BEE5;font-weight:600;text-decoration:none;\">AISI 415<\/a>  \u00b7  <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/aisi-416\/\" style=\"color:#24BEE5;font-weight:600;text-decoration:none;\">AISI 416<\/a>  \u00b7  <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/martensitic-steels\/\" style=\"color:#666;font-weight:600;text-decoration:none;\">Martensitic steels \u2192<\/a><\/p>\n<\/div>\n<p><!-- \/dm-benzer --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>AISI 440C (1.4125 \/ X105CrMo17) is a high carbon martensitic stainless steel that can be hardened to 58-62 HRC. Chemical composition, heat treatment parameters, mechanical properties, ASTM A276 \/ A479 \/ A582 and AMS 5630, AMS 5880 standards, bearing, blade and mould applications.<\/p>\n","protected":false},"author":1,"featured_media":2148,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-4098","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 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>AISI 440C (1.4125 \/ UNS S44004) \u2014 AMS 5618 \/ AMS 5630 \/ AMS 5880 Stainless Steel - Defence Metal<\/title>\n<meta name=\"description\" content=\"AISI 440C (1.4125 \/ X105CrMo17) is a high carbon martensitic stainless steel that can be hardened to 58-62 HRC.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.defencemetal.com\/index.php\/2025\/06\/20\/aisi-440c-1-4125-uns-s44004-ams-5618-ams-5630-ams-5880-stainless-steel\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AISI 440C (1.4125 \/ UNS S44004) \u2014 AMS 5618 \/ AMS 5630 \/ AMS 5880 Stainless Steel - 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