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Hot Rolled Black Seamless Carbon Steel Pipe 20# 45# Q355b. Full range of medium & small outer diameter, OD 57mm-219mm, WT 3.5mm-30mm, widely used in general industrial piping, structural engineering and machinery parts. Made of high quality 20#/45#/Q355B carbon steel, stable mechanical performance, good weldability and processability, easy for cutting and bending. Strictly tested by hydrostatic pressure, chemical composition and mechanical property test, reliable quality for long-term service in various working conditions.