Cold Worked Type 4 Nickel-Iron Soft Magnetic Alloy
Cold worked Type 4 magnetic alloy is Type 4 magnetic alloy in the cold worked (strain hardened) condition. The graph bars on the material properties cards below compare cold worked Type 4 magnetic alloy to: wrought nickels (top), all nickel 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 28 x 106 psi
Elongation at Break
2.0 %
Fatigue Strength
400 MPa 58 x 103 psi
Poisson's Ratio
0.31
Shear Modulus
73 GPa 11 x 106 psi
Shear Strength
630 MPa 91 x 103 psi
Tensile Strength: Ultimate (UTS)
1100 MPa 160 x 103 psi
Tensile Strength: Yield (Proof)
1040 MPa 150 x 103 psi
Thermal Properties
Curie Temperature
460 °C 860 °F
Latent Heat of Fusion
290 J/g
Maximum Temperature: Mechanical
900 °C 1650 °F
Melting Completion (Liquidus)
1420 °C 2590 °F
Melting Onset (Solidus)
1370 °C 2500 °F
Specific Heat Capacity
440 J/kg-K 0.11 BTU/lb-°F
Thermal Expansion
11 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
2.9 % IACS
Electrical Conductivity: Equal Weight (Specific)
3.0 % IACS
Otherwise Unclassified Properties
Base Metal Price
60 % relative
Density
8.8 g/cm3 550 lb/ft3
Embodied Carbon
10 kg CO2/kg material
Embodied Energy
140 MJ/kg 59 x 103 BTU/lb
Embodied Water
210 L/kg 26 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
22 MJ/m3
Resilience: Unit (Modulus of Resilience)
2840 kJ/m3
Stiffness to Weight: Axial
12 points
Stiffness to Weight: Bending
22 points
Strength to Weight: Axial
35 points
Strength to Weight: Bending
27 points
Thermal Shock Resistance
37 points
Alloy Composition
| Ni | 79 to 82 | |
| Fe | 9.5 to 17.5 | |
| Mo | 3.5 to 6.0 | |
| Mn | 0 to 0.8 | |
| Si | 0 to 0.5 | |
| Co | 0 to 0.5 | |
| Cr | 0 to 0.3 | |
| Cu | 0 to 0.3 | |
| C | 0 to 0.050 | |
| S | 0 to 0.020 | |
| P | 0 to 0.010 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
ASTM A753: Standard Specification for Wrought Nickel-Iron Soft Magnetic Alloys (UNS K94490, K94840, N14076, N14080)
Metallic Materials: Physical, Mechanical, and Corrosion Properties, Philip A. Schweitzer, 2003
Engineering Properties of Nickel and Nickel Alloys, John L. Everhart, 1971