... Zhejiang, Jiangsu, Shandong of China (Mainland)* Mill: Qingshan, Baofeng, Taigang pipe* Certification: ISO* Material Grade: 304,304L,309,310S,316L,321 ... occur and therefore require a high level of durable steel pipe strength, high antioxidant properties and have a good organization ... delivery of corrosive liquids.*Air pressure. Hydraulic test pressure on the pipe, it is tested at 2.45 MPa with water ...