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Short Description:
A binary nickel-iron containing around 41% nickel, this grade exhibits a low and normally consistent coefficient of thermal expansion over the range 20-300oC. This enables its use in glass-to-metal or ceramic-to-metal sealing applications and in tooling for aerospace composites.
Product Description
The Invar 42 has excellent controlled expansion quality and is primarily intended for controlled expansion and magnetic applications. Invar 42® is also very effective in magnetic applications. It can be hot formed, cold formed or machined. Nilo 42 has many of the properties of other Invar alloys. It is effective at extreme temperatures ranging from -32℃ to 275C,The Invar 42’s coefficient of thermal expansion (CTE) is close to zero. This beneficial quality makes Nilo 42 one of the most effective alloys for manufacturing precision instruments. Invar 42 is widely considered to be the metal of choice for many glass-to-metal seal applications.
Alloy 42 Characteristic
- Transformer & capacitor bushings
- Automotive & industrial lamps
- Electronic tubes
- Glass-to-metal applications
- Ceramic-to-metal Applicati
Alloy 42 Physical Properties
Density: 0.291 lb/in³, 8.11 g/cm³
Thermal Conductivity: BTU-in/hr-ft2-°F (W/m•K): At 68 °F (20 °C): 72.8 (10.5)
Electrical Resistivity: ohm-cir-mil/ft, microhm-cm:
At 68 °F (20 °C): 367 (61)
At 212 °F (100 °C): 421 (70)
At 392 °F (200 °C): 523 (87)
At 572 °F (300 °C): 608 (101)
At 752 °F (400 °C): 662 (110)
At 932 °F (500 °C): 698 (116)
At 1112 °F (600 °C): 722 (120)
Mean Coefficient of Thermal Expansion: µin/in-°F (µm/m-°C): Annealed
68 – 572 °F (20 – 300 °C): 2.9 (5.3)
68 – 662 °F (20 – 350 °C): 3.0 (5.4)
68 – 752 °F (20 – 400 °C): 3.4 (6.2)
68 – 842 °F (20 – 450 °C): 3.9 (7.1)
68 – 932 °F (20 – 500 °C): 4.4 (8.0)
Modulus of Elasticity: ksi (MPa): 21.8 x 103 (150 x 103) in tension
Melting Range: 2615 °F (1435 °C)
Alloy 42 Chemical Composition
| % | C | Si | Mn | S | P | Ni | Fe | Al | Co |
|---|---|---|---|---|---|---|---|---|---|
| Alloy 42 | ≤0.05 | ≤0.3 | ≤0.8 | ≤0.02 | 0.02 | 41.5~ 42.5 | Balance | ＜0.10 | ＜1.0 |
Alloy 42 The typical heat treatment
| Type | Temperature | Time | Cooling |
|---|---|---|---|
| Anneal | 850 – 1000 °C (1560 – 1830 °F) | 0.5 Hr | Air or water |
Alloy 42 The typical mechanical properties
| Annealed | ||
|---|---|---|
| Approx. tensile strength | <600 N/mm² | <87 ksi |
| Approx. operating temperature | up to +300 °C | up to +570 °F |
| Hard Drawn | ||
|---|---|---|
| Approx. tensile strength | 700-900 N/mm² | 102-131 ksi |
| Approx. operating temperature | up to +300 °C | up to +570 °F |
- Bars & Rods & Foring Ring /Flanges
- Sheet & Plate
- Strip & Coil
- Welding Wire &Spring wire
- Seamless Tube & Welded Pipe
»Round Bar & Square Bar & Hexagon Bar
● Diameter : φ8～φ300mm Length:10mm-6000mm
● Hot forging, Hot Rolling, Cold Drawing
● Bright Surface, Polished Surface, Black Surface
»Tube & Pipe:Seamless Tube& Welded Pipe
● Cold Drawing Seamless Pipe： φ1.0～φ220mm
● Hot Extrusion pipe: φ50～φ250mm
● Others : U Blend Tube and Elbow
»Hot Rolled Plate & Cold Rolled Sheet
● Cold Rolling Sheet Thickness: ≦2.0mm Width:≦1500m
● Hot rolling Plate Thickness: ≧4.0mm Width: ≦2500m
»Strip & Tape Ribbon
● Thickness: ≧ 0.01mm Width: 15mm-300mm
● Cold rolling BA Strip, Hard & Soft Condition
»Straight Length Wire & Spool Wire
● Welding Wire: φ 0.1mm～6.0mm Cut length Rod: φ1.0～φ8.0mm
● Package : 5-25kg/Spool or Box
Alloy 42 ApplicationsI
It is used for tooling for aerospace composites, thermostat rods, for semiconductor lead frames, for ceramic-to-metal seals with alumina ceramics, in thermostatic bi-metal strip, and for various glass-to-metal sealing applications in microelectric components, cores of copper-clad wire for vacuum sealing into glass envelopes of electric lamp bulbs, radio valves, television tubes, and fluorescent lights.