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Cold rolled welded square, rectangular steel pipe hollow section prefab house steel tube
The cold-rolled welded pipe has high precision, uniform wall thickness, high brightness inside the pipe surface (the surface brightness of the steel pipe is determined by the surface grade of the steel plate), and can be arbitrarily fixed. In high precision, medium and low pressure fluid applications reflect its economy and aesthetics. the cold rolled use widely, the pipes used for fence pipe, furniture, tools, building material and so on. they are surface smoothly , and black color.
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