Standard: GB/T 8162 Grade: 10, 20, 35, 45, Q345, 40Mn2,45Mn2,27SiMn, ... 20CrMo, 35CrMo. OD: 6-660 mm Length:39.34'/12M.max Standard: GB ... /T 8162Grade: 10, 20, 35, 45, Q345, 40Mn2, 45Mn2 ... DirectorBeijing Topensea International Co., LtdT: 86-10-69243766 /69252311F: 86-10-69298861 TOPENSEA... Supplying the best... with ...