201/301/304 stainless steel square tube standard ASTM A554 Polished,Hariline and Satin GradeMechanical PropertiesTensile StrengthYied ... ,shipbuilding,military use,chemical,automobile exhaust tube and furniture. stainless steel square tube 201stainless steel pipe/tube OD:9.5mm,12.7mm,15 ... , widely used in architectural decoration, furniture, etc stainless steel square tube