Supreme Steels

Alloy F51

Alloy F51 (UNS S31803) - Duplex Stainless Steel

Alloy F51, also known as UNS S31803, is a duplex stainless steel designed to offer a balance of high strength and excellent corrosion resistance, particularly in chloride-containing environments. With a microstructure that consists of approximately equal parts of ferrite and austenite, it provides superior stress corrosion cracking (SCC) resistance and better mechanical properties compared to austenitic stainless steels.

Features of Alloy F51:

Specifications:

Applicable Standards:

Mechanical Properties:

Property Value
Tensile Strength ~700 MPa
Yield Strength ~450 MPa
Elongation ~25%
Hardness (BHN) ~290
Density 7.8 g/cm³

Thermal Properties:

Chemical Composition:

Element Percentage (%)
Chromium (Cr) 22.0-23.0
Nickel (Ni) 4.5-6.5
Molybdenum (Mo) 2.5-3.5
Nitrogen (N) 0.08-0.20
Carbon (C) ≤0.03
Silicon (Si) ≤1.0
Manganese (Mn) ≤2.0
Phosphorus (P) ≤0.04
Sulfur (S) ≤0.02