... : ChinaApplication: Seamless steel tubes for equipment, pipelines, vessels,pipe fittingsand mechanical StructuresGrade: 10,20,35,45,Q345,15CrMo,12Cr1MoV,A53A,A53B ... steel grade can be provided according to customer required.Dimensions, Mechanical properties, Chemical composition: Refers to GB5310-1999 or please contact with ...