Alloy 431 Steel (UNS S43100)
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Alloy 431 Stainless Steel (ASTM A240/ ASTM A276)
Alloy 431 is a high-performance martensitic stainless steel known for its excellent corrosion resistance, high strength, and toughness. It is commonly used in marine environments and applications that require good mechanical properties combined with resistance to wear and corrosion, especially in conditions involving moderate to severe corrosive environments.
Features of Alloy 431:
- High Strength and Hardness: Offers high tensile strength and excellent hardness, making it suitable for wear-resistant applications.
- Corrosion Resistance: Good resistance to corrosion in seawater and other mild corrosive environments.
- Good Toughness: Superior toughness at both room and elevated temperatures compared to other martensitic stainless steels.
- Heat Treatable: Can be hardened by heat treatment to achieve desired mechanical properties.
- Good Weldability: Suitable for welding with proper preheating and post-weld heat treatment.
Specifications:
Applicable Standards:
- ASTM A240, ASTM A276, UNS S43100
Mechanical Properties:
| Property | Value |
|---|---|
| Tensile Strength | ~750 MPa |
| Yield Strength | ~500 MPa |
| Elongation | ~15% |
| Hardness (BHN) | ~300-350 |
| Density | 7.75 g/cm³ |
Thermal Properties:
- Melting Range: 1450-1500°C
Chemical Composition:
| Element | Percentage (%) |
|---|---|
| Chromium (Cr) | 15.0-17.0 |
| Nickel (Ni) | ≤1.0 |
| Manganese (Mn) | ≤1.0 |
| Silicon (Si) | ≤1.0 |
| Carbon (C) | 0.20-0.30 |
| Phosphorus (P) | ≤0.04 |
| Sulfur (S) | ≤0.03 |