Features: 1) Main materials: 304, 321, 316, 316L, 317L, 310, 310S 2) OD: 40 - 350mm 3) Main technical standards: GB/T14975-94, GB/T14976-94, GB/T1220-92 4) Quality control: we test mechanical and chemical properties of our products in every procedure 5) Application range: petroleum, chemical industry, medical equipment, paper making