heater tube Grade: 304.321.316L.309S.310S O.D:3mm- ... :Electronics,hardware,ect ASTM A554,A269 heater tubeFeatures: 1) Production Standard :ASTM A269;ASTM A554,2) Material of commonly ... :3mm-12mm; wall thickness:0.25mm-1.50mm4) Annual production capacity: 800 tons5),appliance,apparatus,instruments,thermostats,elctronics,hardware Etc ... ),hardness:high,middle,low.8),cuting without burr. heater tube