... " 4.WT:SCH10-SCHXXS 5.Certificate:API/EN/ISO seamless steel pipes 1. seamless steel pipes 2.high quality,best price 3.OD:1/2"-48 ... line:API7)Fluid pipe:GB/T81638)Structure pipe:GB/T81629)Precision tube:GB/T363910)Casing pipe:API SPEC 5CTAnd some other ... :20,Q3458)Structure pipe:10,20,35,45,16Mn,Q345B9)Precision tube:St35,St37.4(10#),St45(20#)St55(35#),Ck45 ...