Supreme Steels

904L

904L - High-Alloy Stainless Steel

904L is a high-alloy austenitic stainless steel that is specifically designed for environments where high resistance to corrosion is essential. It contains significant amounts of nickel, chromium, molybdenum, and copper, giving it outstanding resistance to a wide range of aggressive corrosive media, including sulfuric acid, phosphoric acid, and seawater. 904L is commonly used in industries such as chemical processing, oil and gas, pharmaceuticals, and marine applications due to its durability and resistance to corrosion, stress corrosion cracking, and pitting.

The alloy’s high nickel content provides excellent resistance to oxidation and its molybdenum content improves its resistance to pitting and crevice corrosion, making it one of the best materials for environments that involve harsh chemicals or saline solutions.

Features of 904L:

Specifications:

These standards confirm the alloy’s suitability for various high-performance applications in industries that demand superior corrosion resistance and durability.

Composition of 904L:

Element Percentage
Nickel (Ni) 23.0-28.0%
Chromium (Cr) 19.0-23.0%
Molybdenum (Mo) 4.0-5.0%
Copper (Cu) 1.0-2.0%
Iron (Fe) Balance
Carbon (C) 0.02% Max
Manganese (Mn) 2.0% Max
Silicon (Si) 1.0% Max
Sulfur (S) 0.03% Max
Phosphorus (P) 0.045% Max

Physical Properties:

Property Value
Density 8.0 g/cm³
Melting Point 1375-1400°C (2500-2550°F)
Hardness (BHN) 190-220 BHN
Tensile Strength 520 MPa (75,000 psi)
Yield Strength 220 MPa (31,000 psi)
Elongation 40%
Modulus of Elasticity 200 GPa
Thermal Conductivity 14.9 W/m·K
Coefficient of Thermal Expansion 16.5 x 10^-6 /°C