SPECIAL STAINLESS STEEL
We supply Special Stainless Steel 316Ti, 317L, 904L. Our range of stainless, high-corrosion, and heat-resistant steels covers a variety of product forms, materials, and dimensions. Special stainless steels represent a material situated between the non-corrosive steels and the nickel alloys. These iron-nickel-chromium alloys differ from ordinary non-corrosive steels by their higher alloying additions of nickel, chromium or molybdenum.
• Stainless Steel 316Ti UNS S31635
• Stainless Steel 317L UNS S31703
• Stainless Steel 904L UNS N08904
• Sheet, Plate, Bar, Pipe and Fittings
• Full plates, sheets, Rings, Discs, According to drawing
Special Stainless Steel Alloy 317L UNS S31703 DIN 1.4438
317L is a molybdenum bearing, low carbon content “L” grade austenitic stainless steel that provides improved corrosion resistance over 304L and 316L stainless steels. The low carbon provides resistance to sensitization during welding and other thermal processes.
317L has excellent corrosion resistance in a wide range of chemicals, especially in acidic chloride environments such as those encountered in pulp and paper mills. Increased levels of chromium, nickel and molybdenum compared to 316L stainless steel improve resistance to chloride pitting and general corrosion. Resistance increases with molybdenum alloy content. 317L is resistant to sulfuric acid concentrations up to 5 percent at temperatures as high as 120°F (49°C). At temperatures under 100°F (38°C) this alloy has excellent resistance to solutions of higher concentration. However, service tests are recommended to account for the affects of specific operating conditions that may affect corrosion behavior. In processes where condensation of sulfur-bearing gases occurs, 317L is much more resistant to attack at the point of condensation than conventional alloy 316. The acid concentration has a marked influence on the rate of attack in such environments and should be carefully determined by service tests.
Special Stainless Steel Alloy 904L UNS N08904 DIN 1.4539
Alloy 904L (UNS N08904) is a superaustenitic stainless steel designed for corrosion and pitting resistance in a wide range of process environments. It is used extensively in the chemical process industry including the production of phosphate-based fertilizers.
Alloy 904L (UNS N08904) is a superaustenitic stainless steel that is designed for moderate to high corrosion resistance in a wide range of process environments. The combination of high chromium and nickel content, coupled with additions of molybdenum and copper, assure good to excellent corrosion resistance.
With its highly alloyed chemistry — 25% nickel and 4.5% molybdenum, 904L provides good chloride stress corrosion cracking resistance, pitting and general corrosion resistance superior to 316L and 317L molybdenum enhanced stainless steels.
Alloy 904L was originally developed to withstand environments containing dilute sulfuric acid. It also offers good resistance to other inorganic acids such as hot phosphoric acid as well as most organic acids.
Alloy 904L is easily welded and processed by standard shop fabrication practices.