420 Stainless Steel
UNS S42000
Description
420 stainless steel is a hardenable, martensitic stainless steel that is a modification of alloy 410. However, 420 stainless steel has higher carbon content than alloy 410 which is designed to optimize strength and hardness characteristics. Like any other stainless steel, 420 stainless steel can also be hardened through heat treatment. It offers good ductility in its annealed state and excellent corrosion resistance properties when the metal is polished, surface grounded or hardened. Regarding non-magnetism, 420 stainless steel is not, since it is a martensitic-ferromagnetic alloy, so industrial tools made of said alloy cannot be used in environments where there are strong magnetic fields. And it is never used in the annealed condition.
Chemical Component
| Cr | Si | C | Mn | Ni | Mo | S | P | Cu | Al | Sn | Fe |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 12.00-14.00% | 1.00% max | 0.30-0.40% | 1.00% max | 0.50% max | 0.50% max | 0.030% max | 0.040% max | 0.50% max | 0.15% max | 0.050% max | Balance |
Basic Information
| Items | 420 Stainless Steel |
|---|---|
| Catalog | ACMA-Fe-A021 |
| Density | 0.28 lb/in3, 7.74 g/cm3 |
| Electrical Resistivity, microhm-in (microhm-cm) | 68 °F (20 °C): 21.71 (55.0) |
| Specific Heat, BTU/lb/°F (kJ/kg·K) | 32-212 ° F (0-100 °C): 0.11 (0.46) |
| Thermal Conductivity, BTU/hr/ft2/ft/°F (W/m·K) | At 212 ° F (100 °C): 14.4 (24.9); At 932 ° F (500 °C): 16.6 (28.7) |
| Mean Coefficient of Thermal Expansion, in/in/°F (µm/m·K) | 32-212 ° F (0-100 °C): 5.7 x 10-6 (10.2); 32-1200 ° F (0- 649 °C): 6.8 x 10-6 (12.1) |
| Modulus of Elasticity, ksi (MPa) | 29 x 103 (200 x 103) in tension |
| Magnetic Permeability | Magnetic |
| Melting Range, °F (°C) | 2723 (1495) |
Material Forms
Alfa Chemistry offers 420 stainless steel in a variety of forms, including Coil, Strip, Foil, Ribbon, Wire.
Mechanical Properties
- Mechanical properties at room temperature properties: annealed
| Ultimate Tensile Strength | Elongation | Hardness |
|---|---|---|
| 100 KSI max (690 MPa max) | 15% min | B 96 max |
Additional Properties
Corrosion Resistance: 420 stainless steel provides full corrosion resistance only in the hardened or hardened and tempered. In these conditions, its corrosion resistance is similar to type 410. Refer to NACE (National Association of Corrosion Engineers) for recommendations.
Cold Forming: 420 stainless steel can be moderately drawn and formed in the annealed condition.
Heat Treatment: 420 stainless steel can be hardened by cold working and by heat treating.
Welding: The martensitic class of stainless steels has limited weldability due to its hardenability.
Specifications
Coil, Strip, Foil, Ribbon, Wire: AMS 5506, AMS 5621, ASTM A240, ASTM A 580
Applications
- Cutlery
- Surgical and dental instruments
- Scissors
- Tapes
- Straight edges
- Fasteners
- Firearms
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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