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ASTM A139 is a standard specification for electric resistance welded straight and spiral seam steel pipe manufactured using the arc welding process.

The composition of 12Cr1MoV alloy steel usually includes 0.08-0.15% carbon, 0.40-0.70% silicon, 0.40-0.70% manganese, 0.30-0.60% molybdenum, 0.40-0.55% chromium, 0.15-0.25% vanadium and a small amount of elements. Other alloying elements.