... .: OD: (8-580)mm, WT: (1-30) 2) Main material: 304, 304L, 321, 3 Stainless Steel Seamless 1) Spec.: OD ... : (8-580)mm, WT: (1-30) 2) Main material: 304, 304L, 321, 316, 316L, 317, 310S, etc.3) ... ASTMA5114) Quality control: test products' mechanical and chemical properties in every procedure5) Applications range: petroleum, chemical industry, medical equipment, paper making, heat preservation ...