SS 420
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Product Description:
SS 420 is a high-carbon martensitic stainless steel that is known for its excellent hardness and corrosion resistance. It is one of the most commonly used stainless steels for applications requiring high strength and moderate corrosion resistance. SS 420 can be heat-treated to high hardness levels, making it suitable for applications such as cutting tools, knives, surgical instruments, and valves, where both mechanical properties and resistance to oxidation are critical.
Features:
- High Hardness: SS 420 can achieve a high hardness (up to 50-55 HRC) after heat treatment, making it suitable for cutting tools, knives, and other precision instruments.
- Corrosion Resistance: While not as corrosion-resistant as higher chromium grades (like SS 304 or SS 316), SS 420 offers good resistance to corrosion in mild environments, such as freshwater, some acids, and atmospheric conditions.
- Magnetic Properties: As a martensitic stainless steel, SS 420 is magnetic, which makes it ideal for certain applications that require magnetic properties, such as in motors or sensors.
- Good Strength and Toughness: It offers good tensile strength and toughness, providing good wear resistance while maintaining reasonable resistance to cracking.
- Heat Treatable: SS 420 can be hardened through heat treatment, offering versatility for a wide range of applications requiring various levels of hardness.
Specifications:
- ASTM A276: Standard specification for hot-finished or cold-finished bars of stainless steel.
- ASTM A313: Specification for stainless steel spring wire, including SS 420.
- UNS S42000: The Unified Numbering System (UNS) designation for SS 420 stainless steel.
- DIN 1.4021 (Germany): A European standard for martensitic stainless steel.
- BS 420S29 (British Standard): A specification for SS 420 in the UK.
Composition of SS 420 Stainless Steel:
Element | Percentage |
---|---|
Carbon (C) | 0.15 – 0.40% |
Chromium (Cr) | 12.0 – 14.0% |
Manganese (Mn) | 1.0% Max |
Silicon (Si) | 1.0% Max |
Phosphorus (P) | 0.04% Max |
Sulfur (S) | 0.03% Max |
Iron (Fe) | Balance |
Nickel (Ni) | 0.75% Max |
Physical Properties:
Property | Value |
---|---|
Density | 7.75 g/cm³ |
Melting Point | 1400°C (2550°F) |
Hardness (Brinell) | 200-250 HB |
Tensile Strength | 520-750 MPa (75,000-109,000 psi) |
Yield Strength | 450-600 MPa (65,000-87,000 psi) |
Elongation | 12-18% |
Modulus of Elasticity | 200 GPa |
Thermal Conductivity | 24 W/m·K |
Coefficient of Thermal Expansion | 10.5 × 10⁻⁶ /°C |