steel pipe manufacture standard: JIS, GB,DIN,ASTM,EN,AISI welded tubes 201/202/304/430/409L/316L steel pipeManufacture Standard:JIS, GB, DIN, ASTM, EN ... , satin, hairline, mirrorMaterial: AISI 201/202/304/430/409L/316LManufacture standard: ASTM A554Usage: construction , industry materials and so on.High quality ... several tubes are packed by weaving bag, which is seaworth steel pipe