Alloy 420 / 13Cr (UNS S42000)
Alloy 420 is a high-carbon martensitic stainless steel capable of achieving high hardness and strength through heat treatment. It provides good corrosion resistance in mild environments along with excellent wear resistance.
Supplied in annealed or hardened and tempered conditions, Alloy 420 is widely used for cutting tools, shafts, valve parts, and components requiring high surface hardness and edge retention.
Specifications
- UNS: S42000
- ASTM: A276, A182
- EN / DIN: 1.4021
- Structure: Martensitic
- Condition Supplied: Annealed / Quenched & Tempered
Data Tables
Chemical Composition:
| C | Mn | P | S | Si | Cr | Ni | Ti | Mo | N | Cu | Fe | Co | Nb (+Ta) | V | W | Al | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 0.15 | 12 | |||||||||||||||
| Max | 0.25 | 1 | 0.04 | 0.03 | 1 | 14 | 1 | 0.6 | Bal |
Mechanical Properties:
| Material Grade | ASTM Standard | Desgnation(EN /UNS) | Yield Strength (MPa) | Yield Strength (KSI) | Tensile Strength (MPa) | Tensile Strength (KSI) | Elongation (%) | Reduction of Area (%) | Hardness(HRC/HBWMax) | Condition | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| SS 420 / 13Cr | ASTM A276 | EN 1.4021(S42000 ) | - | - | 241 BHN | Annealed | |||||
| SS 420 / 13Cr (80 KSI) | ASTM A473 | EN 1.4021(S42000 ) | 552 | 80.060976 | 655 | 94.99989 | 20 | 40 | 223 BHN | Quenching + Double Tempered |
Physical Properties:
| Material Grade | Density (g/cm³) | Melting Range (°C) | Modulus of Elasticity (GPa) | Thermal Conductivity (W/m·K) | Thermal Expansion (×10⁻⁶ /°C) | Electrical Resistivity (µΩ·m) | Magnetic Behavior |
|---|---|---|---|---|---|---|---|
| 420 / 13Cr | 7.75 | 1450–1510 | 200 | 24 | 10.3 | 0.55 | Magnetic |
Key Features
- High hardness and strength after heat treatment
- Excellent wear and abrasion resistance
- Moderate corrosion resistance
- Good polishability and surface finish
- Suitable for high-stress applications
Applications
- Valve trims and components
- Pump shafts
- Cutting tools and blades
- Wear-resistant mechanical parts
- High-strength forged components