... GB, SH, AND HG etc MaterialStainless Steel: TP304, TP304L, TP316,TP316L,TP310S,TP321,TP202.Carbon Steel: ASTM A53/A106,ASTM A179,API 5L ... X42/52/60Alloy Steel: ASTM A213,A335,JISG3458/G3462 ... paymentCertificateAPI, CCS,and ISO9001:2000Productivity200000 ton per yearKeywords: SCH 40 steel tube,carbon steel tube,seamless tube