{"id":69938,"date":"2026-05-17T17:28:58","date_gmt":"2026-05-17T17:28:58","guid":{"rendered":"https:\/\/evgroupchina.com\/encyclopedia-of-metal\/astm-a790-m-asme-sa790-m\/"},"modified":"2026-05-19T15:32:21","modified_gmt":"2026-05-19T15:32:21","slug":"astm-a790-m-asme-sa790-m","status":"publish","type":"wiki","link":"https:\/\/evgroupchina.com\/en\/encyclopedia-of-metal\/astm-a790-m-asme-sa790-m\/","title":{"rendered":"ASTM A790 M \/ ASME SA790 M"},"content":{"rendered":"

Technical Regulation and Scope of ASTM\/ASME A\/SA 790 Pipes<\/h2>\n

The ASTM A790 \/ A790M (ASME SA790 \/ SA790M) specification establishes strict requirements for the production of seamless and welded ferritic-austenitic (duplex) steel pipes. This metal product, supplied by EV Group China, is designed for use in aggressive environments where high resistance to stress corrosion cracking is critical.<\/p>\n

It is important to consider that these steel grades are prone to embrittlement under prolonged thermal exposure; therefore, their use in high-temperature conditions requires strict adherence to operational parameters.<\/p>\n

For projects with increased safety requirements, EV Group China ensures the performance of additional tests, the list of which is agreed upon at the order processing stage.<\/p>\n

Geometric parameters of the pipes comply with the recommendations of ANSI B36.19M. We are also prepared to supply products with non-standard dimensions, provided that the physical and mechanical characteristics regulated by the standard are fully maintained.<\/p>\n

Measurement unit systems (SI and inch-pound) within this standard are independent. In the absence of an \u201cM\u201d index in the order, values in inch-pounds are considered a priority.<\/p>\n

NOTE: The terminology \u201cnominal diameter\u201d and \u201cpipe size\u201d completely replaces the former dimensionless designation NPS.<\/em><\/p>\n

Chemical Composition of Steel Grades per ASTM A790 \/ ASME SA790 Standard<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Steel Grade \/ UNS<\/th>\nC max.<\/th>\nMn max.<\/th>\nP max.<\/th>\nS max.<\/th>\nSi max.<\/th>\nNi<\/th>\nCr<\/th>\nMo<\/th>\nN<\/th>\nCu<\/th>\nW<\/th>\n<\/tr>\n<\/thead>\n
S31200<\/td>\n0.030<\/td>\n2.0<\/td>\n0.045<\/td>\n0.030<\/td>\n1.0<\/td>\n5.5-6.5<\/td>\n24.0-26.0<\/td>\n1.2-2.0<\/td>\n0.14-0.2<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
S31260<\/td>\n0.030<\/td>\n1.0<\/td>\n0.030<\/td>\n0.030<\/td>\n0.75<\/td>\n5.5-7.5<\/td>\n24.0-26.0<\/td>\n2.5-3.5<\/td>\n0.1-0.3<\/td>\n0.2-0.8<\/td>\n0.1-0.5<\/td>\n<\/tr>\n
S31500<\/td>\n0.030<\/td>\n1.2-2.0<\/td>\n0.030<\/td>\n0.030<\/td>\n1.4-2.0<\/td>\n4.2-5.2<\/td>\n18.0-19.0<\/td>\n2.5-3.0<\/td>\n0.05-0.1<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
S31803<\/td>\n0.030<\/td>\n2.0<\/td>\n0.030<\/td>\n0.020<\/td>\n1.0<\/td>\n4.5-6.5<\/td>\n21.0-23.0<\/td>\n2.5-3.5<\/td>\n0.08-0.2<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
S32003<\/td>\n0.030<\/td>\n2.0<\/td>\n0.030<\/td>\n0.020<\/td>\n1.0<\/td>\n3.0-4.0<\/td>\n19.5-22.5<\/td>\n1.5-2.0<\/td>\n0.14-0.2<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
S32101<\/td>\n0.040<\/td>\n4.0-6.0<\/td>\n0.040<\/td>\n0.030<\/td>\n1.0<\/td>\n1.35-1.7<\/td>\n21.0-22.0<\/td>\n0.1-0.8<\/td>\n0.2-0.25<\/td>\n0.1-0.8<\/td>\n–<\/td>\n<\/tr>\n
S32205<\/td>\n0.030<\/td>\n2.0<\/td>\n0.030<\/td>\n0.020<\/td>\n1.0<\/td>\n4.5-6.5<\/td>\n22.0-23.0<\/td>\n3.0-3.5<\/td>\n0.14-0.2<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
S32304<\/td>\n0.030<\/td>\n2.5<\/td>\n0.040<\/td>\n0.040<\/td>\n1.0<\/td>\n3-5.5<\/td>\n21.5-24.5<\/td>\n0.05-0.6<\/td>\n0.05-0.2<\/td>\n0.05-0.6<\/td>\n–<\/td>\n<\/tr>\n
S32520<\/td>\n0.030<\/td>\n1.5<\/td>\n0.035<\/td>\n0.020<\/td>\n0.8<\/td>\n5.5-8.0<\/td>\n24.0-26.0<\/td>\n3.0-5.0<\/td>\n0.2-0.35<\/td>\n0.5-3.0<\/td>\n–<\/td>\n<\/tr>\n
S32550<\/td>\n0.040<\/td>\n1.5<\/td>\n0.040<\/td>\n0.030<\/td>\n1.0<\/td>\n4.5-6.5<\/td>\n24.0-27.0<\/td>\n2.9-3.9<\/td>\n0.1-0.25<\/td>\n1.5-2.5<\/td>\n–<\/td>\n<\/tr>\n
S32750<\/td>\n0.030<\/td>\n1.2<\/td>\n0.035<\/td>\n0.020<\/td>\n0.8<\/td>\n6.0-8.0<\/td>\n24.0-26.0<\/td>\n3.0-5.0<\/td>\n0.24-0.32<\/td>\n0.5<\/td>\n–<\/td>\n<\/tr>\n
S32760<\/td>\n0.050<\/td>\n1.0<\/td>\n0.030<\/td>\n0.010<\/td>\n1.0<\/td>\n6.0-8.0<\/td>\n24.0-26.0<\/td>\n3.0-4.0<\/td>\n0.2-0.3<\/td>\n0.5-1.0<\/td>\n0.5-1.0<\/td>\n<\/tr>\n
S32808<\/td>\n0.030<\/td>\n1.1<\/td>\n0.030<\/td>\n0.030<\/td>\n0.50<\/td>\n7.0-8.5<\/td>\n27.0-27.9<\/td>\n0.8-1.2<\/td>\n0.3-0.4<\/td>\n–<\/td>\n2.1-2.5<\/td>\n<\/tr>\n
S32900<\/td>\n0.080<\/td>\n1.0<\/td>\n0.040<\/td>\n0.030<\/td>\n0.75<\/td>\n2.5-5.0<\/td>\n23-28<\/td>\n1.0-2.0<\/td>\n–<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
S32906<\/td>\n0.030<\/td>\n0.8-1.5<\/td>\n0.030<\/td>\n0.030<\/td>\n0.50<\/td>\n5.8-7.5<\/td>\n28.0-30.0<\/td>\n1.5-2.6<\/td>\n0.3-0.4<\/td>\n0.8<\/td>\n–<\/td>\n<\/tr>\n
S32950<\/td>\n0.030<\/td>\n2.0<\/td>\n0.035<\/td>\n0.010<\/td>\n0.60<\/td>\n3.5-5.2<\/td>\n26.0-29.0<\/td>\n1.0-2.5<\/td>\n0.15-0.35<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
S39274<\/td>\n0.030<\/td>\n1.0<\/td>\n0.030<\/td>\n0.020<\/td>\n0.80<\/td>\n6.0-8.0<\/td>\n24.0-26.0<\/td>\n2.5-3.5<\/td>\n0.24-0.32<\/td>\n0.2-0.8<\/td>\n1.5-2.5<\/td>\n<\/tr>\n
S39277<\/td>\n0.025<\/td>\n0.8<\/td>\n0.025<\/td>\n0.002<\/td>\n0.80<\/td>\n6.5-8.0<\/td>\n24.0-26.0<\/td>\n3.0-4.0<\/td>\n0.23-0.33<\/td>\n1.2-2.0<\/td>\n0.8-1.2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Mechanical Properties of Ferritic-Austenitic Pipes<\/h2>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Steel Grade \/ UNS<\/th>\nMin. Tensile Strength, ksi [MPa]<\/th>\nMin. Yield Strength, ksi [MPa]<\/th>\nMin. Elongation, %<\/th>\nMax. HBW<\/th>\nMax. HRC<\/th>\n<\/tr>\n<\/thead>\n
S31200<\/td>\n100 \/ 690<\/td>\n65 \/ 450<\/td>\n25<\/td>\n280<\/td>\n–<\/td>\n<\/tr>\n
S31260<\/td>\n100 \/ 690<\/td>\n65 \/ 450<\/td>\n25<\/td>\n–<\/td>\n–<\/td>\n<\/tr>\n
S31500<\/td>\n92 \/ 630<\/td>\n64 \/ 440<\/td>\n30<\/td>\n290<\/td>\n30<\/td>\n<\/tr>\n
S31803<\/td>\n90 \/ 620<\/td>\n65 \/ 450<\/td>\n25<\/td>\n290<\/td>\n30<\/td>\n<\/tr>\n
S32003<\/td>\n90 \/ 620<\/td>\n65 \/ 450<\/td>\n25<\/td>\n290<\/td>\n30<\/td>\n<\/tr>\n
S32101 (\u2264 5mm)<\/td>\n101 \/ 700<\/td>\n77 \/ 530<\/td>\n30<\/td>\n290<\/td>\n–<\/td>\n<\/tr>\n
S32101 (> 5mm)<\/td>\n94 \/ 650<\/td>\n65 \/ 450<\/td>\n30<\/td>\n290<\/td>\n–<\/td>\n<\/tr>\n
S32205<\/td>\n95 \/ 655<\/td>\n65 \/ 450<\/td>\n25<\/td>\n290<\/td>\n30<\/td>\n<\/tr>\n
S32304<\/td>\n87 \/ 600<\/td>\n58 \/ 400<\/td>\n25<\/td>\n290<\/td>\n30<\/td>\n<\/tr>\n
S32520<\/td>\n112 \/ 770<\/td>\n80 \/ 550<\/td>\n25<\/td>\n310<\/td>\n–<\/td>\n<\/tr>\n
S32550<\/td>\n110 \/ 760<\/td>\n80 \/ 550<\/td>\n15<\/td>\n297<\/td>\n31<\/td>\n<\/tr>\n
S32750<\/td>\n116 \/ 800<\/td>\n80 \/ 550<\/td>\n15<\/td>\n300<\/td>\n32<\/td>\n<\/tr>\n
S32760<\/td>\n109 \/ 750<\/td>\n80 \/ 550<\/td>\n25<\/td>\n270<\/td>\n–<\/td>\n<\/tr>\n
S32808<\/td>\n116 \/ 800<\/td>\n70 \/ 485<\/td>\n15<\/td>\n310<\/td>\n32<\/td>\n<\/tr>\n
S32900<\/td>\n90 \/ 620<\/td>\n94 \/ 650<\/td>\n20<\/td>\n271<\/td>\n28<\/td>\n<\/tr>\n
S32906 (< 10mm)<\/td>\n116 \/ 800<\/td>\n94 \/ 650<\/td>\n25<\/td>\n300<\/td>\n32<\/td>\n<\/tr>\n
S32906 (> 10mm)<\/td>\n109 \/ 750<\/td>\n80 \/ 550<\/td>\n25<\/td>\n300<\/td>\n32<\/td>\n<\/tr>\n
S32950<\/td>\n100 \/ 690<\/td>\n70 \/ 480<\/td>\n20<\/td>\n290<\/td>\n30<\/td>\n<\/tr>\n
S39274<\/td>\n116 \/ 800<\/td>\n80 \/ 550<\/td>\n15<\/td>\n310<\/td>\n–<\/td>\n<\/tr>\n
S39277<\/td>\n120 \/ 825<\/td>\n90 \/ 620<\/td>\n25<\/td>\n290<\/td>\n30<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":0,"template":"","meta":[],"wiki_category":[112],"class_list":["post-69938","wiki","type-wiki","status-publish","hentry","wiki_category-astm"],"_links":{"self":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki\/69938","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\/69938\/revisions"}],"wp:attachment":[{"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/media?parent=69938"}],"wp:term":[{"taxonomy":"wiki_category","embeddable":true,"href":"https:\/\/evgroupchina.com\/en\/wp-json\/wp\/v2\/wiki_category?post=69938"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}