steel pipe ,tube 1.Standard:BS,ASTM,GB/T,DIN 2.Material:Q195- ... system authentication CompanyTianJin RuiTong Steel Co., Ltd.TypeSteel Pipe (or tube) ManufacturerPlace of originChinaGradeQ195,Q215,Q235,Q345,X42,X60,X65,X70 ... ,GR.A,GR.BSpecification1.Outer Dianeter:21.3mm-609.6mm 2.Wall ...