... for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes and Tubes.ASTM A312 standard covers seamless, straight-seam welded, and heavily cold worked ... , Such as YUSCO, BNG, POSCO and JINDAL. 2) Process method: Cold drawn, Pickling, Polishing, Annealing, Inner bead Removed, Inner Pplishing, TIG welded ...