... you various steel pipes according to international standard. Black steel pipes are used in the following fields, steel structure, build structure, transportation ... oval and other special section type4. Detailed Product DescriptionERW steel pipeGRADE:Q195,Q215,Q235,Q275,Q345 OD:21.3mm ... 0.8mm-8.5mm Length:12m PRODUCTHOT DIP GALVANIZED STEEL PIPE/GI LINE PIPETECHNIQUEWELDED/ERWMATERIALQ195,Q215,Q235,Q275, ...