... YUSCO, BNG, POSCO and JINDAL. 2) Process method: Cold drawn, Pickling, Polishing, Annealing, Inner bead Removed, Inner Pplishing, ... Heat-Exchanger, Condenser Tubes, Sanitation, food industry , Petroleum and Gas Industry and Liquird Delivery.6) Surface: 180#, 400#, 600# , ... to customers' requests. ASTM A312 Welded and Inner Bead Removed Stainless Steel Pipes, Tubes and Tubings for Liquid Delivery