... Shandong of China (Mainland)* Mill: Qingshan, Baofeng, Taigang pipe* Certification: ISO* Material Grade: 304,304L,309,310S ... Industrial application: Petroleum, Gas, Chemical, Fertilizer, Medical Equipment, Water Disposal and Fluid Transfer Field.* Mode of Management ... includes: Equality and precise wall thickness, smooth inner wall surface, without stain, inner polishing ≤02-04um.Terms & Conditions:* ...