Seamless stainless steel pipe Material Grade: 304,304L,309,310S,316L, ... China (Mainland)* Mill: Qingshan, Baofeng, Taigang pipe* Certification: ISO* Material Grade: 304,304L,309,310S,316L,321,TP317, ... -temperature and high pressure, high temperature gas pipe in water vapor and the effects of oxidation ... therefore require a high level of durable steel pipe strength, high antioxidant properties and have a ...