Alloy 42
UNS K94100
Description
Alloy 42 is a nickel iron alloy containing 41% nickel with a silvery-white lustrous. It belongs to the controlled expansion and low expansion alloy groups with low and constant coefficient of thermal expansion from 20 °C to 300 °C, which makes the alloy with the ability to withstand extreme temperatures and makes the seal resistant to shock and cracking. In addition, Alloy 42 has the properties of good workability, weldability and easy to machine. All of these features make it well suited to applications where the thermal expansion must be minimized.
Chemical Component
| Ni | Fe | Al | Mn | C | Si | Cr | P | S |
|---|---|---|---|---|---|---|---|---|
| 41.00% (nominal) | Remainder | 0.10% max | 0.80% max | 0.05% max | 0.30% max | 0.25% max | 0.025% max | 0.025% max |
Basic Information
| Items | Alloy 42 |
|---|---|
| Catalog | ACMA-Ni-A002 |
| Density | 0.293 lb/in3 |
| Melting Point | 2600 °F (1425 °C) |
| Specific Heat | 0.12 BTU/lb °F |
| Electrical Resistivity | 430 ohm-cir mil/ft |
| Mean Coefficient of Thermal Expansion (Annealed) | 20-300 °C: 5.3 µm/m-°C; 20-350 °C: 5.4 µm/m-°C; 20-400 °C: 6.2 µm/m-°C; 20-450 °C: 7.1 µm/m-°C; 20-500 °C: 8.0 µm/m-°C |
| Thermal Conductivity | 74.5 BTU-in/sq. ft-hr-°F |
| Curie Temp | 716 °F |
| Specific Gravity | 8.12 |
Material Forms
Alfa Chemistry offers Alloy 42 in a variety of forms, including
- Sheet & Plate
- Strip
- Round Bar
- Rod
- Wire
Typical Mechanical Properties
| Tensile Strength | Yield Strength | Elongation (in 2 in.) | Hardness Ann. | Modulus of Elasticity |
|---|---|---|---|---|
| 75 ksi (517 MPa ) | 40 ksi (276 MPa ) | 30% | 76 Rockwell B | 21.5 x 103 ksi |
Specifications
Sheet & Plate, Strip, Round Bar, Rod, Wire: ASTM F30, MIL-I-23011 CL 5, AMS 1-23011 CL 5
Applications
Alloy 42 can be used in a variety of applications, including:
- Integrated circuit lead frames
- Terminals
- Enameled resistors, without prior thermal treatment
- Bubble-free glass-metal seals
- Electronic tubes
- Lids for hermetic packages
- Automotive lamps
- Industrial lamps
- Transformer bushings
- Capacitor bushings
Among the many applications, Alloy 36 is most suitable for aerospace applications.
* 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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