... Austenitic Stainless Steel Pipes and Tubes.ASTM A312 standard covers seamless, straight-seam welded, and heavily cold worked welded ... austenitic stainless steel pipe/tubes intended for high-temperature and ... Heat-Exchanger, Condenser Tubes, Sanitation, food industry , Petroleum and Gas Industry and Liquird Delivery.6) Surface: 180#, 400#, 600# , ...