1)API Oil Pipe 2)SIZE:21.3--1250mm 3)Thickness ... BS1387-85,JIS-G3444,GB/T3091-2001,etc. API Oil Pipe:1)welded square pipe2)SIZE:21.3--1250mm ... -2001,etc.LengthAs per client requirementUsagePetrol,gas,water pipe,construction,chimney potProcessing techniqueThreading,coupling,necking,punching .etc ... as your requestprovide other steel pipe: cold rolled,hot rolled,hot dipped,ERW pipe,etc.We sincerely hope ...