ASTM A312 Stainless Steel 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 ... Heat-Exchanger, Condenser Tubes, Sanitation, food industry , Petroleum and Gas Industry and Liquird Delivery.6) Surface: 180#, 400#, 600# , ...