... Pipes and Tubes can resist corrosion and proof pressure, and are suit for Petrochemical Industry. ASTM A312 is a Standard Specification for Seamless, Welded, and Heavily ... , Heat-Exchanger, Condenser Tubes, Sanitation, food industry , Petroleum and Gas Industry and Liquird Delivery.6) Surface: 180#, 400#, 600# , 800#, 180# Hairline, 240 ...