... manufacture standard: JIS, GB,DIN,ASTM,EN,AISI welded tubes 201/202/304/430/409L/316L welded steel pipeManufacture Standard:JIS ... :40 mmFinish: 2B (Mill Finish), bright, satin, hairline, mirrorMaterial: AISI 201/202/304/430/409L/316LManufacture standard: ASTM A554Usage: construction , industry ...