{"id":69972,"date":"2026-05-17T17:29:10","date_gmt":"2026-05-17T17:29:10","guid":{"rendered":"https:\/\/evgroupchina.com\/encyclopedia-of-metal\/astm-a995\/"},"modified":"2026-05-19T15:32:37","modified_gmt":"2026-05-19T15:32:37","slug":"astm-a995","status":"publish","type":"wiki","link":"https:\/\/evgroupchina.com\/en\/encyclopedia-of-metal\/astm-a995\/","title":{"rendered":"ASTM A995"},"content":{"rendered":"<h2>Technical features of duplex castings according to ASTM A995 standard<\/h2>\n<p>This specification regulates the production of austenitic-ferritic (duplex) steel castings intended for use in pressure-containing components: valves, flanges, and fittings. Products supplied by EV Group China fully comply with the standard&#8217;s requirements for chemical composition and mechanical properties.<\/p>\n<p>Duplex alloys combine high strength and exceptional resistance to stress corrosion cracking. The optimal microstructure, consisting of 30\u201360% ferritic phase and an austenitic matrix, is achieved through precise control of alloying elements and precision heat treatment. The selection of a specific steel grade for a project remains the responsibility of the design engineer, taking into account operating media, temperature conditions, and mechanical loads.<\/p>\n<p>When placing an order with EV Group China, the following data must be provided:<\/p>\n<ul>\n<li>Design documentation, including casting tolerances and part specifications;<\/li>\n<li>The exact volume of the batch (in kilograms or units);<\/li>\n<li>The current version of the standard and the selected steel grade;<\/li>\n<li>Specific requirements for non-destructive testing and acceptance methods.<\/li>\n<\/ul>\n<p>All metal is melted in electric arc furnaces followed by ladle refining, which ensures alloy purity from non-metallic inclusions.<\/p>\n<h3>Mechanical properties of duplex steels<\/h3>\n<table class=\"table table-bordered table-hover\">\n<thead>\n<tr>\n<th>Mechanical properties<\/th>\n<th>Grade 1B<\/th>\n<th>Grade 2A<\/th>\n<th>Grade 3A<\/th>\n<th>Grade 4A<\/th>\n<th>Grade 5A<\/th>\n<th>Grade 6A<\/th>\n<th>Grade 7A<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Chemical type<\/td>\n<td>25Cr-5Ni-Mo-Cu-N<\/td>\n<td>24Cr-10Ni-Mo-N<\/td>\n<td>25Cr-5Ni-Mo-N<\/td>\n<td>22Cr-5Ni-Mo-N<\/td>\n<td>25Cr-7Ni-Mo-N<\/td>\n<td>25Cr-7Ni-Mo-N<\/td>\n<td>27Cr-7Ni-Mo-W-N<\/td>\n<\/tr>\n<tr>\n<td>Tensile strength, MPa<\/td>\n<td>&lt;690<\/td>\n<td>&lt;655<\/td>\n<td>&lt;655<\/td>\n<td>&lt;620<\/td>\n<td>&lt;690<\/td>\n<td>&lt;690<\/td>\n<td>&lt;690<\/td>\n<\/tr>\n<tr>\n<td>Yield strength, MPa<\/td>\n<td>&lt;485<\/td>\n<td>&lt;450<\/td>\n<td>&lt;450<\/td>\n<td>&lt;415<\/td>\n<td>&lt;515<\/td>\n<td>&lt;450<\/td>\n<td>&lt;515<\/td>\n<\/tr>\n<tr>\n<td>Elongation, %<\/td>\n<td>16<\/td>\n<td>25<\/td>\n<td>25<\/td>\n<td>25<\/td>\n<td>18<\/td>\n<td>25<\/td>\n<td>20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":0,"template":"","meta":[],"wiki_category":[112],"class_list":["post-69972","wiki","type-wiki","status-publish","hentry","wiki_category-astm"],"_links":{"self":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69972","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69972\/revisions"}],"wp:attachment":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/media?parent=69972"}],"wp:term":[{"taxonomy":"wiki_category","embeddable":true,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki_category?post=69972"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}