Q235 black round erw steel pipe

1. Chinese standards which are equal to kinds of international standards like ASTM, JIS, EN...
2. Third party inspections are accepted and we also have our own experimental test centre to meet the testing requests.
3. For each order, we will test on the materials and products. When the products qualified, then they will be packed into the warehouse.
4. We have 14 production lines and our own experimental test centre to meet the quality and the delivery time.