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hot sell Black Steel Pipe, ERW low carbon hollow section tube
Black annealed steel tube is also called cold rolled steel pipe and tubes,it is also called hollow secion it is one of the most common steel tubes. with the ERW tecnical , Low carbon material , If cold rolled steel is heated to annealing temperature, the surface color turns black due to high temperature contact with air, it is called black annealed steel pipes. Its surface has not been polished so it is black. The physical properties become soft, convenient for further welding into steel pipe. Common hardness 57HRB, can also be reduced to different hardness according to need.
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