... is a subsidiary company of Tianjin Materials and Equipments Group Corporation (Tewoo Group, former Bureau of Materials, a large- ... steel sheet and steel pipe . We are also the first-class agent of Baosteel, Capital steel (shougang), An steel , Ben steel, WISCO, HBIS, Ma steel , Ji steel ... pipes and for water, gas, sewerage conveyance ERW Steel Pipe O.DO.D toleranceW.TThickness Tolerance20--219MM±0.030. ...