The material: 'EFI Alloy 50 Strip/Coil - Rotor Grade' you were looking for has been superseded by the one below.

EFI Alloy 50 Strip/Coil - Rotor Grade

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Alternative and trade names
Magnifer 50®, Carpenter High Permeability 49®, Alloy 47-50
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A soft magnetic alloy, consisting of 48% nickel, balance iron used where high initial permeability, maximum permeability, and low core loss is needed.

Related Standards

Equivalent Materials

This material data has been provided by Matmatch.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

Ashby charts

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23.0 °C

8.18 g/cm³

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0.18 - 0.36 mm

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Available thicknesses: 0.18mm, 0.25mm, 0.36mm



Elastic modulus

23.0 °C

166 GPa

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23.0 °C

40 %

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in 2 in.

Hardness, Rockwell B

23.0 °C

80 [-]

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Tensile strength

23.0 °C

518 MPa

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Yield strength

23.0 °C

159 MPa

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Coefficient of thermal expansion

450.0 °C

9E-6 1/K

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from 20°C to the mentioned temperature

Melting point

1427 °C

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Specific heat capacity

23.0 °C

502 J/(kg·K)

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Thermal conductivity

23.0 °C

13 W/(m·K)

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Electrical resistivity

23.0 °C

4.9E-7 Ω·m

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Coercive force

23.0 °C

4.77 A/m

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Curie temperature

450 °C

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Relative magnetic permeability

23.0 °C

100000 [-]

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Saturation induction

23.0 °C

1.5 T

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Chemical properties



0.02 %

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0.5 %

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48 %

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0.35 %

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Technological properties

Application areas

Common applications of EFI ALLOY 50 are: LF power transducers, stepping motors, magnetic shielding, solenoid cores, relay parts, magnetic valves