... precision dimension. Application: Seamless steel tubes for equipment, pipelines, vessels, pipe fittingsand mechanical StructuresGrade: 10, 20, 35, 45, Q345, 40Mn2, ... ,50Crv, 30CrMnSi Other steel grade can be provided after negotiating with customersDimensions, Mechanical properties, Chemical composition: Refers to GB5310-1999 ... will be highly appreciated andtreated. OEM is welcomed. structure pipe