{"id":69974,"date":"2026-05-17T17:29:10","date_gmt":"2026-05-17T17:29:10","guid":{"rendered":"https:\/\/evgroupchina.com\/encyclopedia-of-metal\/astm-a890\/"},"modified":"2026-05-19T15:32:37","modified_gmt":"2026-05-19T15:32:37","slug":"astm-a890","status":"publish","type":"wiki","link":"https:\/\/evgroupchina.com\/en\/encyclopedia-of-metal\/astm-a890\/","title":{"rendered":"ASTM A890"},"content":{"rendered":"<h2>Technical specifications and application area of ASTM A890 duplex castings<\/h2>\n<p>This specification defines the requirements for cast duplex stainless steels (austenitic-ferritic class) supplied by EV Group China. These alloys are characterized by a synergy of high mechanical performance and enhanced resistance to localized and general corrosion, achieved through precise chemical composition and strict adherence to heat treatment regimes.<\/p>\n<p>The microstructure of these steels provides for a ferrite phase content in the range of 30% to 60%, with the remainder being austenite. The choice of a specific steel grade for a project implementation should be based on an analysis of operating conditions, required strength characteristics, and the corrosive aggressiveness of the environment.<\/p>\n<p>EV Group China notes that metric and inch units of measurement in the standard are independent systems. To avoid non-compliance with technical requirements, it is not recommended to combine values from different measurement systems when designing products.<\/p>\n<p>The standard was developed within the framework of international WTO standardization principles, which guarantees the unification of product quality in the global metal market.<\/p>\n<h3>Recommendations for placing an order with EV Group China<\/h3>\n<p>To ensure the correct execution of an order for cast products compliant with the ASTM A890 standard, the following technical documentation must be provided:<\/p>\n<ul>\n<li>Detailed drawings of the castings indicating all geometric parameters and tolerances.<\/li>\n<li>Precise designation of the specification, the required steel grade, and the current release year of the standard.<\/li>\n<li>Specifications for additional options according to clause 9.1 of the standard.<\/li>\n<li>A list of additional quality control requirements and acceptance criteria for the finished products.<\/li>\n<\/ul>\n<h3>Production technology<\/h3>\n<p>The entire range of products supplied by EV Group China is manufactured using the electric arc melting method. To achieve the required metal purity, a refining technology using Argon-Oxygen Decarburization (AOD) is employed, which minimizes the content of harmful impurities.<\/p>\n<h3>Heat treatment regimes<\/h3>\n<p>All castings undergo mandatory heat treatment, the parameters of which are strictly regulated by the requirements listed in the table below:<\/p>\n<table class=\"table table-bordered table-hover\">\n<thead>\n<tr>\n<th>Steel Grade<\/th>\n<th>Heat treatment temperature, \u00b0C<\/th>\n<th>Cooling method<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>ASTM A890 Grade 1A<\/td>\n<td>1040 (minimum)<\/td>\n<td>Rapid cooling in water or air<\/td>\n<\/tr>\n<tr>\n<td>ASTM A890 Grade 4A<\/td>\n<td>1080 (minimum)<\/td>\n<td>Rapid cooling<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":0,"template":"","meta":[],"wiki_category":[112],"class_list":["post-69974","wiki","type-wiki","status-publish","hentry","wiki_category-astm"],"_links":{"self":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69974","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\/69974\/revisions"}],"wp:attachment":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/media?parent=69974"}],"wp:term":[{"taxonomy":"wiki_category","embeddable":true,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki_category?post=69974"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}