... JISB2311 JISB2312 JISB2313, BS, GB, ISOMaterial --Carbon steel --ASTM A234WPB,,A234WPC,A420WPL6. 20#,Q235,10#,20#,A3, Q235A ... St52.4,St.35.8,St.35.8 ASTM A333 GR.6 ; API 5L GRB, X60, X65, X42 ... ,X52, ASTM A860 WPHY 70, WPHY 65, WPHY 60 ... etc .Stainless Steel --ASTM A403 WP304,304L,316,316L,321. 1Cr18Ni9Ti, 00Cr19Ni10,00Cr17Ni14Mo2, etcAlloy Steel --ASTM A234 WP12,WP11,WP22 ...