{"id":70130,"date":"2026-05-17T17:30:03","date_gmt":"2026-05-17T17:30:03","guid":{"rendered":"https:\/\/evgroupchina.com\/encyclopedia-of-metal\/astm-a387-m-asme-sa387-m\/"},"modified":"2026-05-19T15:33:47","modified_gmt":"2026-05-19T15:33:47","slug":"astm-a387-m-asme-sa387-m","status":"publish","type":"wiki","link":"https:\/\/evgroupchina.com\/en\/encyclopedia-of-metal\/astm-a387-m-asme-sa387-m\/","title":{"rendered":"ASTM A387 M \/ ASME SA387 M"},"content":{"rendered":"<h2>Technical features of steel according to the ASTM A387 \/ A387M specification<\/h2>\n<p>The ASTM A387 specification (identical to ASME SA 387) establishes strict requirements for the quality and chemical composition of alloy steel plates, alloyed with chromium and molybdenum. This type of metal product from EV Group China is optimized for the production of welded steam boilers and vessels operating under high pressure at elevated temperature conditions.<\/p>\n<p>The high chromium content provides improved corrosion resistance and heat resistance, while molybdenum increases the yield strength and creep resistance. Below is the grading of steel grades depending on their chemical composition:<\/p>\n<table class=\"table table-bordered table-hover\">\n<thead>\n<tr>\n<th>Steel Grade<\/th>\n<th>Nominal Chromium Content, %<\/th>\n<th>Nominal Molybdenum Content, %<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>2<\/td>\n<td>0.50<\/td>\n<td>0.50<\/td>\n<\/tr>\n<tr>\n<td>12<\/td>\n<td>1.00<\/td>\n<td>0.50<\/td>\n<\/tr>\n<tr>\n<td>11<\/td>\n<td>1.25<\/td>\n<td>0.50<\/td>\n<\/tr>\n<tr>\n<td>22, 22L<\/td>\n<td>2.25<\/td>\n<td>1.00<\/td>\n<\/tr>\n<tr>\n<td>21, 21L<\/td>\n<td>3.00<\/td>\n<td>1.00<\/td>\n<\/tr>\n<tr>\n<td>5<\/td>\n<td>5.00<\/td>\n<td>0.50<\/td>\n<\/tr>\n<tr>\n<td>9<\/td>\n<td>9.00<\/td>\n<td>1.00<\/td>\n<\/tr>\n<tr>\n<td>91<\/td>\n<td>9.00<\/td>\n<td>1.00<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>Classification by tensile strength varies depending on the selected grade. Most alloys are available in two strength classes. Exceptions are grades 21L and 22L, which are supplied exclusively in Class 1, as well as grade 91, which is available only in Class 2.<\/p>\n<p><em>Important note: the requirements for Grade 911 steel have been removed from this specification and are now regulated by the ASTM A1017\/A1017M standard.<\/em><\/p>\n<p>The technological capabilities of EV Group China allow for the production of plates with a thickness limited only by the necessity of maintaining the specified mechanical properties of the metal. When designing equipment, it should be noted that values in the inch-pound and SI systems are independent standards and are not subject to mutual conversion to ensure full compliance with the specification.<\/p>\n<p>This rolled steel standard is fully harmonized with international WTO norms in the field of technical barriers to trade, which guarantees high quality and predictable material behavior under critical load conditions.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"wiki_category":[112],"class_list":["post-70130","wiki","type-wiki","status-publish","hentry","wiki_category-astm"],"_links":{"self":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/70130","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\/70130\/revisions"}],"wp:attachment":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/media?parent=70130"}],"wp:term":[{"taxonomy":"wiki_category","embeddable":true,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki_category?post=70130"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}