{"id":4090,"date":"2025-06-02T14:26:30","date_gmt":"2025-06-02T11:26:30","guid":{"rendered":"https:\/\/www.defencemetal.com\/?p=4090"},"modified":"2026-09-17T23:08:09","modified_gmt":"2026-09-17T20:08:09","slug":"maraging-300-1-6358-ams-6514-ams-6521-ultra-high-strength-steel","status":"publish","type":"post","link":"https:\/\/www.defencemetal.com\/index.php\/2025\/06\/02\/maraging-300-1-6358-ams-6514-ams-6521-ultra-high-strength-steel\/","title":{"rendered":"Maraging 300 (1.6358) \u2014 AMS 6514 \/ AMS 6521 Ultra High Strength 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 Maraging 300.<\/strong> For sizes, standard equivalents, stock and quotations, take a look at the <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/maraging-300\/\"><strong>Maraging 300 product page<\/strong><\/a>.<\/div>\n<p><!-- \/dm-urun-link --><\/p>\n<h3><b>MARAGING 300<\/b><\/h3>\n<h3><b>Maraging 300 Steel: The Industrial Meeting of High Strength and Ductility<\/b><\/h3>\n<p class=\"p3\">Maraging 300 is a special alloy belonging to the class of martensitic age-hardenable steels, standing out for its high strength and excellent ductility. The alloy takes its name from \u201cmartensitic aging\u201d, that is, from the improvement of its mechanical properties by the <a href=\"https:\/\/en.wikipedia.org\/wiki\/Martensitik_paslanmaz_%C3%A7elik\">martensitic<\/a> ageing treatment. Thanks to its superior durability, fatigue resistance and high-performance characteristics, Maraging 300 is widely preferred particularly in the aerospace, defence, automotive and high-technology sectors.<\/p>\n<p class=\"p3\">The chemical composition of Maraging 300, its mechanical properties, its heat treatment procedures, its specifications under the AMS and ASTM standards, its industrial fields of application and its commercial importance are examined comprehensively in this article in academic language.<\/p>\n<h3><b>Maraging 300 Chemical Composition and Microstructure<\/b><\/h3>\n<p class=\"p3\">Maraging 300 is an alloy notable for its low carbon content and its high proportions of nickel, cobalt, molybdenum and titanium. This composition allows the alloy to acquire high strength, durability and ductility. The typical chemical composition is as follows:<\/p>\n<ul>\n<li class=\"p1\">Nickel (Ni): 18.0\u201319.0%<\/li>\n<li class=\"p1\">Cobalt (Co): 8.0\u20139.5%<\/li>\n<li class=\"p1\">Molybdenum (Mo): 4.6\u20135.2%<\/li>\n<li class=\"p1\">Titanium (Ti): 0.55\u20130.80%<\/li>\n<li class=\"p1\">Aluminium (Al): 0.05\u20130.15%<\/li>\n<li class=\"p1\">Carbon (C): maximum 0.03%<\/li>\n<li class=\"p1\">Iron (Fe): balance<\/li>\n<\/ul>\n<p class=\"p3\">The microstructure of this alloy is martensitic, and after the ageing treatment very fine precipitates (intermetallic compounds) form, increasing hardness and durability. The low carbon level improves the machinability and weldability of the material, providing an advantage for high-performance applications.<\/p>\n<h3><b>Maraging 300 <\/b><b>Mechanical Properties and Heat Treatment Procedures<\/b><\/h3>\n<p class=\"p3\">The superior mechanical performance of Maraging 300 is achieved by suitable heat treatments. The heat treatment generally consists of two main stages:<\/p>\n<ol>\n<li class=\"p1\"><span class=\"s1\"><b>Solution annealing:<\/b><\/span> carried out in the range of roughly 820\u2013860 \u00b0C. With this operation the alloy acquires a homogeneous structure, the dissolved elements are freed and preparation is made for transformation to the martensitic structure.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Ageing:<\/b><\/span> carried out between 480 and 510 \u00b0C and lasting roughly 3 to 6 hours. At this stage the fine precipitates that provide hardening form within the alloy and the mechanical strength increases considerably.<\/li>\n<\/ol>\n<p class=\"p3\">The following mechanical properties are obtained as a result of the heat treatment:<\/p>\n<ul>\n<li>Tensile strength: 1700\u20131900 MPa<\/li>\n<li>Yield strength: 1600\u20131800 MPa<\/li>\n<li>Hardness: 48\u201352 HRC (Rockwell C)<\/li>\n<li>Elongation: between 4 and 6%<\/li>\n<li>Impact toughness: high<\/li>\n<\/ul>\n<p class=\"p3\">These mechanical properties make Maraging 300 an ideal alloy for critical applications requiring high strength and ductility.<\/p>\n<h3><b>AMS and ASTM Standards<\/b><\/h3>\n<p class=\"p3\">As one of the materials of critical importance particularly in the aerospace and defence industries, Maraging 300 is subject to various international standards. These standards provide broad quality control, from the chemical composition of the material to the production process, and from mechanical testing to the certification stage.<\/p>\n<ul>\n<li class=\"p1\"><span class=\"s1\"><b>AMS 6509:<\/b><\/span> an important aerospace standard defining the chemical composition and production processes of Maraging 300 steels as well as the mechanical test criteria.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>AMS 6510:<\/b><\/span> this standard covers the post-heat-treatment mechanical performance and certification criteria of Maraging 300.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>ASTM A687:<\/b><\/span> a general production and quality control standard for stainless and alloy steels, which can also be applied to maraging alloys.<\/li>\n<\/ul>\n<p class=\"p3\">Thanks to these standards, reliable and consistent performance of the Maraging 300 alloy on the international market is guaranteed.<\/p>\n<h3><b>Maraging 300 <\/b><b>Technical Properties and Specifications<\/b><\/h3>\n<p class=\"p3\">Maraging 300 stands out for technical properties such as high durability, superior fatigue resistance and high hardness. In addition, the low carbon content of the alloy considerably reduces the risk of crack formation in welding operations. Its other technical properties can be listed as follows:<\/p>\n<ul>\n<li class=\"p1\"><span class=\"s1\"><b>High strength-to-weight ratio:<\/b><\/span> Maraging 300 offers high tensile and yield strength while keeping its light structure.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Excellent ductility and impact strength:<\/b><\/span> despite its high hardness, its brittleness is low.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Good weldability:<\/b><\/span> the low carbon and titanium contents reduce the risk of cracking after welding.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>A low coefficient of thermal expansion:<\/b><\/span> provides dimensional stability even at high temperatures.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Wear resistance:<\/b><\/span> thanks to precipitation hardening it resists surface wear.<\/li>\n<\/ul>\n<p class=\"p3\">These technical properties make Maraging 300 ideal for parts requiring performance and durability.<\/p>\n<h3><b>Maraging 300 <\/b><b>Industrial Fields of Application<\/b><\/h3>\n<p class=\"p3\">The superior performance of Maraging 300 makes it indispensable in many advanced technology industries. Its most widespread fields of application are:<\/p>\n<ul>\n<li class=\"p1\"><span class=\"s1\"><b>Aerospace industry:<\/b><\/span> Maraging 300 is used in landing gear, structural parts, rocket engine components and spacecraft members. High strength, low weight and high fatigue resistance are demanded in these critical applications.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Defence industry:<\/b><\/span> it meets durability and toughness requirements in missile parts, armour plating and high-performance military equipment.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Automotive industry:<\/b><\/span> preferred in the suspension systems, chassis and engine components of performance vehicles. High strength and light weight improve vehicle performance.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>Sports and recreation equipment:<\/b><\/span> used for high durability in golf clubs, ski equipment and bicycle parts.<\/li>\n<li class=\"p1\"><span class=\"s1\"><b>High technology industry:<\/b><\/span> widely used in the production of precision tooling and dies, in applications requiring high durability and hardness.<\/li>\n<\/ul>\n<h3><b>Production Process and Machinability<\/b><\/h3>\n<p class=\"p3\">The Maraging 300 alloy is suitable for various production techniques such as casting, forging and machining. Because of its high alloy content and its tendency to harden, however, it is difficult to machine. The durability of the cutting tools and the cooling methods affect machining efficiency.<\/p>\n<p class=\"p3\">While hardness and durability increase after heat treatment, machinability decreases. Suitable pre-annealing operations may therefore be applied before machining. Welding operations must be carried out carefully; preheating and subsequent ageing are generally recommended. These stages minimise the risk of crack formation and preserve the mechanical performance of the material.<\/p>\n<hr>\n<h2><b>Advantages<\/b><\/h2>\n<ul>\n<li class=\"p1\"><b>Very high tensile and yield strength<\/b><\/li>\n<li class=\"p1\"><b><\/b><b>Excellent ductility and impact toughness<\/b><\/li>\n<li class=\"p1\"><b><\/b><b>High weldability thanks to the low carbon content<\/b><\/li>\n<li class=\"p1\"><b><\/b><b>High hardness and wear resistance<\/b><\/li>\n<li class=\"p1\"><b><\/b><b>High fatigue strength, providing long-lasting performance<\/b><\/li>\n<li class=\"p1\"><b><\/b><b>A wide field of application and high performance<\/b><\/li>\n<\/ul>\n<hr>\n<h2><b>Disadvantages<\/b><\/h2>\n<ul>\n<li class=\"p1\"><b>Its machinability is difficult and requires special cutting tools<\/b><\/li>\n<li class=\"p1\"><b><\/b><b>The heat treatment process is complex and time-consuming<\/b><\/li>\n<li class=\"p1\"><b><\/b><b>Its cost is high because of the high alloy content<\/b><\/li>\n<li class=\"p1\"><b><\/b><b>Welding operations demand care and special procedures<\/b><\/li>\n<li class=\"p1\"><b><\/b><b>In some cases excessive hardness can increase the risk of brittleness<\/b><\/li>\n<\/ul>\n<hr>\n<h3><b>Conclusion<\/b><\/h3>\n<p class=\"p3\">Maraging 300 is a top-tier maraging alloy preferred in critical industrial applications requiring high strength, durability and excellent ductility. Full certification within the framework of the AMS and ASTM standards allows the material to be used with confidence in sectors such as aerospace, defence and automotive. Although it has special production, machining and heat treatment requirements, the performance it provides makes this steel attractive as an investment.<\/p>\n<p>&nbsp;<\/p>\n<h5><span aria-hidden=\"true\">#<\/span>AMS6514<br \/>\n#AMS6521<br \/>\n<span aria-hidden=\"true\">#<\/span>ASTMA538<br \/>\n<span aria-hidden=\"true\">#<\/span>MILS46850D<br \/>\n<span aria-hidden=\"true\">#<\/span>UNSK93120<\/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 Maraging 300 (1.6358)<\/div>\n<div style=\"padding:2px 12px 8px;\">\n<table id=\"tablepress-59\" class=\"tablepress tablepress-id-59\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Kimyasal Bile\u015fimi<br \/>\n(Maraging 300 \u2013 X2NiCoMo19-9-5)<br \/>\n<strong><\/th><td class=\"column-2\"><\/td><th class=\"column-3\">Oda S\u0131cakl\u0131\u011f\u0131ndaki<br \/>\nMekanik \u00d6zellikleri<br \/>\n<strong><\/th><td class=\"column-4\"><\/td>\n<\/tr>\n<tr class=\"row-2\">\n\t<th class=\"column-1\">Kalite <strong><\/th><th class=\"column-2\">Maraging 300 (1.6358)<\/th><th class=\"column-3\">\u00d6zellikler<\/th><th class=\"column-4\">De\u011ferler<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-hover\">\n<tr class=\"row-3\">\n\t<td class=\"column-1\">Ni<\/td><td class=\"column-2\">%18.0-19.0<\/td><td class=\"column-3\">\u00d6z k\u00fctlesi (\u00d6zg\u00fcl a\u011f\u0131rl\u0131\u011f\u0131)<\/td><td class=\"column-4\">8000 kg\/m\u00b3<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">Fe<\/td><td class=\"column-2\">%60.0-69.0 (Genelde %67 civar\u0131nda)<\/td><td class=\"column-3\">Erime S\u0131cakl\u0131\u011f\u0131<\/td><td class=\"column-4\">Yakla\u015f\u0131k 1413\u00b0C aras\u0131<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">Mo<\/td><td class=\"column-2\">%4.60-5.20<\/td><td class=\"column-3\"><\/td><td class=\"column-4\"><\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">C<\/td><td class=\"column-2\">max %0.03<\/td><td class=\"column-3\"><\/td><td class=\"column-4\"><\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">Mn<\/td><td class=\"column-2\">max %0.10<\/td><td class=\"column-3\"><\/td><td class=\"column-4\"><\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">Si<\/td><td class=\"column-2\">max %0.10<\/td><td class=\"column-3\"><\/td><td class=\"column-4\"><\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">P<\/td><td class=\"column-2\">max %0.01<\/td><td class=\"column-3\"><\/td><td class=\"column-4\"><\/td>\n<\/tr>\n<tr class=\"row-10\">\n\t<td class=\"column-1\">S<\/td><td class=\"column-2\">max %0.01<\/td><td class=\"column-3\"><\/td><td class=\"column-4\"><\/td>\n<\/tr>\n<tr class=\"row-11\">\n\t<td class=\"column-1\">Al<\/td><td class=\"column-2\">%0.05-0.15<\/td><td class=\"column-3\"><\/td><td class=\"column-4\"><\/td>\n<\/tr>\n<tr class=\"row-12\">\n\t<td class=\"column-1\">Co<\/td><td class=\"column-2\">%8.00-9.50<\/td><td class=\"column-3\"><\/td><td class=\"column-4\"><\/td>\n<\/tr>\n<tr class=\"row-13\">\n\t<td class=\"column-1\">Ti<\/td><td class=\"column-2\">%0.55-0.80<\/td><td class=\"column-3\"><\/td><td class=\"column-4\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-59 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 Maraging 300 (1.6358) \u2014 to AMS 6514 and AMS 6515, in the size and form required. For stock and pricing:<\/p>\n<p><a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/maraging-300\/\" style=\"display:inline-block;color:#ffffff;background:#24BEE5;text-decoration:none;font-weight:600;font-size:14px;padding:10px 17px;line-height:1.2;\">Maraging 300 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\/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\/2025\/06\/02\/maraging-350-ams-6510-ams-6511-ultra-high-strength-steel\/\" style=\"color:#24BEE5;font-weight:600;text-decoration:none;\">Maraging 350<\/a>  \u00b7  <a href=\"https:\/\/www.defencemetal.com\/index.php\/2025\/06\/01\/aermet-100-ams-6532-ams-6478-steel\/\" style=\"color:#24BEE5;font-weight:600;text-decoration:none;\">AerMet 100<\/a>  \u00b7  <a href=\"https:\/\/www.defencemetal.com\/index.php\/2025\/06\/27\/aisi-8740-uns-g87400-1-6546-40nicrmo2-2-ams-6322-ams-6325-alloy-steel\/\" style=\"color:#24BEE5;font-weight:600;text-decoration:none;\">AISI 8740<\/a>  \u00b7  <a href=\"https:\/\/www.defencemetal.com\/index.php\/en\/nickel-alloys\/\" style=\"color:#666;font-weight:600;text-decoration:none;\">All nickel alloys \u2192<\/a><\/p>\n<\/div>\n<p><!-- \/dm-benzer --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Maraging 300 ultra-high-strength steel: chemical composition, heat treatment, mechanical properties, AMS and ASTM standards, and aerospace and defence applications.<\/p>\n","protected":false},"author":1,"featured_media":2164,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[],"class_list":["post-4090","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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