201/301/304 stainless steel square tube standard:ASTM A554 Polished:Hariline and Satin GradeMechanical PropertiesTensile StrengthYied ... ,architecture decoration,shipbuilding,military use,chemical,automobile exhaust tube and furniture. SUS304 stainless steel pipe/tube OD:9.5mm,12.7mm,15.9mm,17mm ... and high quality, widely used in architectural decoration, furniture, etc stainless steel square tube