Standard: GB/T 8162 Grade: 10, 20, 35, 45, Q345, 40Mn2,45Mn2,27SiMn, ... : 6-660 mm Length:39.34'/12M.max Standard: GB/T 8162Grade: 10, 20, 35, 45, Q345, 40Mn2, 45Mn2,27SiMn, 40MnB ... testing/impact inspection/hardness tester and so on.Production capacity: 300,000 metric tons per year. Marking:specification,HS code,origin ...