... ,BS,ASTM,DIN Certifacation:ISO9001:2000 cold drawn galvanized tubesCold Drawn Galvanized Precision Seamless Steel Tube DescriptionCold drawn galvanized seamless steel tubesProcess MethodCold ... ,ST52,ST52.4,E195,E235,E255,E355StandradJIS, GB, DIN, ASTMSurface TreatmentZinc coated(galvanized)OD4mm-90mmWT0.5mm-8mmAdvantageMore than ... and mechanical testing, salt mist test 15mo3 seamless steel tube