Specifications stainless steel round tube manufacture standard: JIS, GB,DIN,ASTM,EN,AISI seamless stee 201/202/304/430/409 Detailed Product Description1 ... .Outer diameter:6mm-830mm.2Wall thickness:0.5mm-40mm.3standard:ASTM A312, A312, A269, A270, A789,A790, B165,B167, B407,B423DIN17458EN10216 ... refinery, heat exchanger, decoration, food dariy stainless steel pipe(304) For Concret,Buildings