... for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes. ASTM A312 standard covers seamless, straight-seam welded, ... general corrosive service.We have our ASTM A312 Stainless Steel Welded Pipes passed Nondestructive Electric Test. Being a professional ... India, Korea and Taiwan, Such as YUSCO, BNG, POSCO and JINDAL. 2) Process method: Cold drawn, Pickling, Polishing, Annealing, ...