... proof pressure, and are suit for Petrochemical Industry. ASTM A312 is a Standard Specification for Seamless, Welded, and Heavily Cold ... cold worked welded austenitic stainless steel pipe/tubes intended for high-temperature and general corrosive service.We have our ... : 180#, 400#, 600# , 800#, 180# Hairline, 240# Hairline.7) Tolerance: Outer Diameter: +/-0.2mm, thickness: +/-0.03mm and length: +/-5mm ...