Alloy 42 Wire UNS N94100

Alloy 42 is a nickel-iron alloy that has a relatively constant coefficient of thermal expansion up to 570°F (300°C).

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Shaped, Flat, Square, Round, Fine Wire, Plated and Bare Wire ASTM F-30

Alloy 42 Alloy Description

Alloy 42 is a nickel-iron alloy that has a relatively constant coefficient of thermal expansion up to 570°F (300°C). This alloy is easily coined.


Electronic cans and covers in metal to glass sealing applications
Semiconductor lead frames
Thermostat bi-metal strips
Micro-electronic components

Chemistry: Typical

Nickel: 41.00 nominal*
Iron: Balance
Carbon: 0.05 max
Silicon: 0.30 max
Manganese: 0.60 max
Chromium: 0.50 max
Phosphorus: 0.025 max
Sulfur: 0.025 max
Aluminum: 0.10 max
* The nickel listed may be adjusted so that the alloy meets the specified requirements for coefficient of thermal expansion

Physical Properties

Density: 0.291lb/in³, 8.11 g/cm³

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)

Thermal Conductivity: BTU-in/hr-ft²-°F (W/m•K)
At 68°F (20°C): 72.8 (10.5)

Mean Coefficient of Thermal Expansion: µin/in-°F (µm/m-°C): Anneale
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 Point: 2615°F (1435°C)

Mechanical Properties at Room Temperature

Properties: Annealed Typical

Ultimate Tensile Strength: 71 KSI nom (490 MPa nom)
Yield Strength: 36 KSI nom (248 MPa nom)
Elongation: 43% nom

Properties Tempered

Alloy 42 can be cold rolled to achieve the temper properties required by specific customers and/or manufacturing requirements. Contact Ulbrich Wire for details.

Additional Properties

Corrosion Resistance

Refer to NACE (National Association of Corrosion Engineers) for recommendations.

Standard Wire Finishes

Extra Clean: (XC) Extra clean is also referred to as “bright annealed” or “bright annealed and
cold rolled”
Grease (round wire only): Drawn in a heavy grease produces an “Ultra bright” finish for
decorative applications
Soap (round wire only): Soap is used as a lubricant in the drawing process and is not
removed. It acts as a lubricant during customer part forming operation. A soap finish is
available in tempered products
Plated: Many plating options are available.
∗Special finishes are available: Contact Ulbrich Wire Sales with special finish and plating requests


Continuous Coils
Cut to lengths
Precision cutting

Heat Treatment

Alloy 42 is non hardenable by heat treatment.


For best results refer to: SSINA’s “Welding of Stainless Steels and Other Joining Methods”.

Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels and Special Metals, Inc., be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.

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