Standard: GB/T 8162 Grade: 10, 20, 35, 45, Q345, 40Mn2,45Mn2,27SiMn, 20CrMo, 35CrMo. ... most competitive prices. Best Regards, Mr.Surn ShuMarketing DirectorBeijing Topensea International Co., LtdT: 86-10-69243766 /69252311F: 86-10-69298861 TOPENSEA ...