... )3.WT: 2.77mm-40.62mm4.Standard: ASTM A106M,A53/A333ASTM A192,ASTM A209,ASTM A210 API 5L, EN10216-1/2 EN10297-1 ... ,C45E,C60E,38Mn6 S235JRH,S275JOH,S355JOH,S355J2H,S355K2H ST37.0,ST44.0,ST55,ST52.0,CK45 ST35.8,ST45.8 STPG 370,STPG ... : First grade 10.Special design available according to customers requirement ASTM A53 Gr.B Black Carbon steel Seamless steel pipe SCH40