About 904L Stainless Steel Sheet
What exactly is 904L stainless steel?
Super austenitic stainless steel alloy 904L is made for a number of mediums that call for exceptional corrosion resistance. With molybdenum and copper added as additional components to this alloy’s high chromium and nickel content, good corrosion resistance is guaranteed. Alloy 904L, which has a 25 percent nickel and a 4.5 percent molybdenum composition, is more resistant to chloride stress corrosion cracking, pitting, and corrosion than 316L and 317L molybdenum stainless steels. The original purpose of alloy 904L’s development was to provide corrosion resistance in diluted sulfuric acid. It also performs well in terms of resistance to most organic acids as well as other inorganic acids (such as hot phosphoric acid).
Handling of 904L Stainless Steel Sheet
Cold Forming: 904L stainless steel sheet is simple to form and extend. Because it contains more molybdenum and nitrogen than 304 or 304L, it needs more robust processing machinery.
Hot Forming: It is advised to keep the temperature for hot forming between 1562 and 2102°F (850-1150°C). Annealing and hardening are often the actions taken after hot forming. However, 904L must be instantly quenched if it ceases to form when the temperature exceeds 2012°F (1100°C) in order to be used without further heat treatment. More significantly, when the temperature exceeds 2012°F (1100°C), the entire workpiece can be quenched. Hot forming must come after the succeeding processes of annealing and quenching when local heating or cooling is below 2012°F (1100°C) and the cooling is too sluggish. It is required to anneal 904L between 1940 and 2084°F.
Chemical Composition of 904L Stainless Steel
- Nickel – 23.0 min.-28.0 max.
- Silicon – 1.00.
- Chromium – 19.0 min.-23.0 max.
- Phosphorus – 0.045.
- Molybdenum – 4.0 min.-5.0 max.
- Sulfur – 0.035.
- Copper – 1.0-2.0 max.
- Iron – Balance
- Manganese – 2.00
Applications
- Used in coal-fired power stations’ scrubbers for air pollution control.
- Chemical processing: This process is used to make sulfuric acid, phosphoric acid, inorganic and organic acids, and phosphate fertilizers in machinery.
- Used in sulfuric acid pickling equipment, and metallurgical processing.
- Used in offshore processing equipment for oil and gas production.
