... proof pressure, and are suit for Liquid Delivery. ASTM A312 is a Standard Specification for Seamless, Welded, and Heavily ... cold worked welded austenitic stainless steel pipe/tubes intended for high-temperature and general corrosive service.We have our ... ) Process method: Cold drawn, Pickling, Polishing, Annealing, Inner bead Removed, Inner Pplishing, TIG welded, Plasma Arc Welded.3) Standards: ASTM ...