q235 erw black square and rectangular steel pipe, Q235 Welded Square Steel Pipe, Q235 Welded Square Steel Alibaba offers 31,441 q235 welded square steel pipe products. About 95% of these are steel pipes, 1% are stainless steel pipes, and 1% are steel sheets. A wide variety of q235 welded square steel pipe options are available to you, such as 20#, 10#, and a53(a,b).
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