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Type 1 (K94490) Iron-Nickel Soft Magnetic Alloy

Type 1 magnetic alloy is an otherwise-unclassified alloy of iron. It has a very high density among iron alloys. In addition, it has a very low heat capacity and a very high base cost.

The properties of Type 1 magnetic alloy include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare Type 1 magnetic alloy to: otherwise unclassified iron alloys (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

4.0 to 38 %

Poisson's Ratio

0.3

Shear Modulus

72 GPa 10 x 106 psi

Tensile Strength: Ultimate (UTS)

500 to 830 MPa 73 to 120 x 103 psi

Tensile Strength: Yield (Proof)

220 to 790 MPa 32 to 120 x 103 psi

Thermal Properties

Curie Temperature

440 °C 820 °F

Latent Heat of Fusion

270 J/g

Melting Completion (Liquidus)

1420 °C 2590 °F

Melting Onset (Solidus)

1370 °C 2500 °F

Specific Heat Capacity

460 J/kg-K 0.11 BTU/lb-°F

Thermal Expansion

12 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

3.1 % IACS

Electrical Conductivity: Equal Weight (Specific)

3.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

31 % relative

Density

8.3 g/cm3 520 lb/ft3

Embodied Carbon

5.6 kg CO2/kg material

Embodied Energy

77 MJ/kg 33 x 103 BTU/lb

Embodied Water

130 L/kg 16 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

33 to 150 MJ/m3

Resilience: Unit (Modulus of Resilience)

130 to 1690 kJ/m3

Stiffness to Weight: Axial

12 points

Stiffness to Weight: Bending

23 points

Strength to Weight: Axial

17 to 28 points

Strength to Weight: Bending

17 to 24 points

Thermal Shock Resistance

16 to 26 points

Alloy Composition

Iron (Fe) 50.7 to 56.5
Nickel (Ni) 43.5 to 46.5
Manganese (Mn) 0 to 0.8
Silicon (Si) 0 to 0.5
Cobalt (Co) 0 to 0.5
Chromium (Cr) 0 to 0.3
Molybdenum (Mo) 0 to 0.3
Copper (Cu) 0 to 0.3
Carbon (C) 0 to 0.050
Sulfur (S) 0 to 0.030
Phosphorus (P) 0 to 0.010

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM A753: Standard Specification for Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490, K94840, N14076, N14080)

Properties and Selection: Irons, Steels and High Performance Alloys, ASM Handbook vol. 1, ASM International, 1993

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015