... Pipes and Tubes can resist corrosion and proof pressure, and are suit for Petrochemical Industry. ASTM A312 is a Standard Specification for Seamless, Welded, and Heavily ... .5-16% Chromium)202(approx 3.5-5.5% Nickel, 15--16% Chromium)304(approx 7.8-9% Nickel, 17-19 ... ) 316L(approx 10-12% Nickel, 15-17% Chromium, 1-2.5% molybdenum and ≤0.03% Carbon)And so on. The original materials import ...