{"id":69508,"date":"2026-05-17T17:26:40","date_gmt":"2026-05-17T17:26:40","guid":{"rendered":"https:\/\/evgroupchina.com\/encyclopedia-of-metal\/astm-a403-m-asme-sa403-m\/"},"modified":"2026-05-19T15:29:12","modified_gmt":"2026-05-19T15:29:12","slug":"astm-a403-m-asme-sa403-m","status":"publish","type":"wiki","link":"https:\/\/evgroupchina.com\/en\/encyclopedia-of-metal\/astm-a403-m-asme-sa403-m\/","title":{"rendered":"ASTM A403 M \/ ASME SA403 M"},"content":{"rendered":"

Technical Overview of ASTM\/ASME A\/SA 403 Standard<\/h2>\n

The ASTM\/ASME A\/SA 403 specification defines stringent requirements for the production of wrought pressure-containing piping fittings. The document details technical parameters for a wide range of austenitic stainless steel grades. Products are classified into WP and CR categories, corresponding to ASME and MSS standards respectively.<\/p>\n

Manufacturing methods are defined for each WP class: seamless construction or welded construction. The class designation system in the specification also establishes Nondestructive Examination (NDE) protocols and quality requirements for welded joints.<\/p>\n

Table 1 contains comprehensive information on the classification of WP grade fittings that meet EV Group China requirements. Specialized industry standards apply to CR grade products.<\/p>\n

Technical parameters are presented in two measurement systems: inch-pound and SI. Values provided without [M] marking are the base values in the inch-pound system. It is important to note that values in different systems are not direct equivalents and should be applied independently to avoid violations of the standard requirements.<\/p>\n

This standard does not cover cast fittings. Characteristics for cast stainless and austenitic alloy products are governed by standards A351\/A351M, A743\/A743M, and A744\/A744M.<\/p>\n

Chemical Composition of Steels for ASTM A403 \/ A403M Fittings<\/h2>\n\n\n\n\n\n\n\n
Steel Grade<\/td>\nChemical Composition, %<\/td>\n<\/tr>\n
Grade WP<\/td>\nGrade CR<\/td>\nUNS<\/td>\nC<\/td>\nMn<\/td>\nP<\/td>\nS<\/td>\nSi<\/td>\nNi<\/td>\nCr<\/td>\nMo<\/td>\nTi<\/td>\nNc<\/td>\nOthers<\/td>\n<\/tr>\n
WPXM-19<\/td>\nCRXM-19<\/td>\nS20910<\/td>\n0.06<\/td>\n4.0-6.0<\/td>\n0.045<\/td>\n0.030<\/td>\n1.00<\/td>\n11.5-13.5<\/td>\n20.5-23.5<\/td>\n1.50-3.00<\/td>\n–<\/td>\n0.20-0.40<\/td>\n–<\/td>\n<\/tr>\n
WP304<\/td>\nCR304<\/td>\nS30400<\/td>\n0.08<\/td>\n2.00<\/td>\n0.045<\/td>\n0.030<\/td>\n1.00<\/td>\n8.0-11.0<\/td>\n18.0-20.0<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
WP316<\/td>\nCR316<\/td>\nS31600<\/td>\n0.08<\/td>\n2.00<\/td>\n0.045<\/td>\n0.030<\/td>\n1.00<\/td>\n10.0-14.0<\/td>\n16.0-18.0<\/td>\n2.00-3.00<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Heat Treatment<\/h2>\n\n\n\n\n\n
Grade WP<\/td>\nGrade CR<\/td>\nUNS<\/td>\nTemperature, min \u00b0C<\/td>\nCooling<\/td>\n<\/tr>\n
WP304<\/td>\nCR304<\/td>\nS30400<\/td>\n1040<\/td>\nWater or rapid cooling<\/td>\n<\/tr>\n
WP316<\/td>\nCR316<\/td>\nS31600<\/td>\n1040<\/td>\nWater or rapid cooling<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Mechanical Properties<\/h2>\n\n\n\n\n
Grade<\/td>\nYield Strength (MPa)<\/td>\nTensile Strength (MPa)<\/td>\n<\/tr>\n
304\/316<\/td>\n205<\/td>\n515<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":0,"template":"","meta":[],"wiki_category":[112],"class_list":["post-69508","wiki","type-wiki","status-publish","hentry","wiki_category-astm"],"_links":{"self":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69508","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\/69508\/revisions"}],"wp:attachment":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/media?parent=69508"}],"wp:term":[{"taxonomy":"wiki_category","embeddable":true,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki_category?post=69508"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}