... corrosion and proof pressure, and are suit for Petrochemical Industry. ASTM A312 is a Standard Specification for Seamless, Welded, and Heavily Cold Worked ... and widely used in many area, just like pharmacy, food industry, petroleum industry, heat exchange and decoration. We manufacture the welded stainless ... requests. ASTM A312 Welded Stainless Steel Pipes, Tubes and Tubings for Petrochemical Industry