... 10# 20# 45# 16Mn pipe steel1) Application: Petroleum,chemical,power,gas,metallurgy, shipbuilding, construction, etc2) Materials: 20#,35#,45#,20G,20MnG ... , X52, X56, X60, X65, X70, St37,ST52Transmission of the petroleum, natural gas and waterCylinder PipeGB1824834Mn2V, 37Mn, 30CrMo, 34CrMo4Raw material for producing cylinderBoiler ...