... BS1387-85,JIS-G3444,GB/T3091-2001,etc. welded square pipe:1)welded square pipe2)SIZE:21.3--1250mm 3)Thickness:1 ... GB/T3091-2001,etc.LengthAs per client requirementUsagePetrol,gas,water pipe,construction,chimney potProcessing techniqueThreading,coupling,necking,punching .etc.Payment ... oeders as your requestprovide other steel pipe: cold rolled,hot rolled,hot dipped,ERW pipe,etc.We sincerely hope to ...