SUS431 Stainless Steel: High-Strength Martensitic Alloy

Carbon (C)

0.20–0.30%

High carbon content increases hardness and wear resistance after heat treatment.

Manganese (Mn)

0.60–1.00%

Improves strength and toughness, especially at lower temperatures.

Chromium (Cr)

16.0–18.0%

Provides resistance to corrosion and oxidation, enhancing durability.

Nickel (Ni)

≤0.60%

Improves formability and ductility, though lower than in austenitic grades.

Phosphorus (P)

≤0.04%

Reduces sulfur contamination and improves machinability.

Density

7.80 g/cm³

Slightly denser than other martensitic stainless steels, ensuring durability.

Melting Point

1,400–1,530°C

Suitable for both cold and hot working, ideal for high-temperature applications.

Thermal Conductivity

26.3 W/m·K

Moderate heat dissipation, suitable for high-heat applications.

Electrical Resistivity

7.4×10⁻⁷ Ω·m

Low electrical conductivity, ideal for non-electrical applications.