welded steel pipe Grade: 304.321.316L.309S.310S O.D:3mm-12mm ... .25-1.5mm Appliance:Electronics,hardware,thermostats ect welded steel pipe Features: 1) Production Standard :ASTM A269;ASTM A554,2) Material ... : 800 tons5),appliance,apparatus,instruments,thermostats,elctronics,hardware Etc.6),precision tolerance,7),hardness:high,middle,low.8),cuting without burr ...