General Information
Chemical Composition
Physical Properties
Mechanical Properties
General Information
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.
Standard Inventory Specifications
- ASTM……..A 240, B 625
- ASME……..SA 240, SB 625
Common Trade Names
- Alloy 904L
Common Applications of 904L
- Air Pollution Control — scrubbers for coal-fired power plants
- Chemical Processing — process equipment for the production of sulfuric, phosphoric, inorganic and organic acids and the production of phosphate-based fertilizers
- Metallurgical Processing — pickling equipment using sulfuric acid
- Oil and Gas Production — offshore process equipment
- Pharmaceutical Industry — process equipment
- Pulp and Paper — processing equipment
- Seawater and Brackish Water — condensers, heat exchangers and piping systems
Chemical Composition
904L Chemical Composition
Element
Percent by Weight
C
Carbon
0.09 maximum
Mn
Manganese
2.00 maximum
P
Phosphorus
0.045 maximum
S
Sulfur
0.035 maximum
Si
Silicon
1.00 maximum
Cr
Chromium
19.00-23.00 maximum
Ni
Nickel
23.00 – 28.00 maximum
Cu
Copper
1.00 – 2.00 maximum
Physical Properties
904L Physical Properties
Physical property | Value | |
Density (Kg/m3) | 0.28 lb/in3 | |
Melting Range: | 2372 – 2534 °F | |
Specific Heat Capacity at 32 – 212°F | 0.11 Btu/lb/°F | |
Thermal Conductivity at 212°F | 6.8 Btu/hr-ft-°F | |
Poisson’s Ratio | ||
Elastic Modulus at 68°F | 28 x 106 psi |
Mechanical Properties
Mechanical Properties 904L

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