... can resist corrosion and proof pressure, and are suit for Petrochemical Industry. ASTM A312 is a Standard Specification for Seamless, Welded, and Heavily Cold Worked ... 3.5-5.5% Nickel, 15--16% Chromium)304(approx 7.8-9% Nickel, 17-19% Chromium) 316L(approx 10- ... form India, Korea and Taiwan, Such as YUSCO, BNG, POSCO and JINDAL. 2) Process method: Cold drawn, Pickling, Polishing, Annealing, Inner bead ...