DIN 17745 NiFe16CuCr: Premium Soft‑Magnetic Material for High‑Performance Transformers

The soft-magnetic material NiFe16CuCr with the material number 2.4501 distinguishes itself by the highest initial and maximum permeability as well as by the lowest coercive field strength. It is applied for transformers, e.g. for totalizing current transformers (for fault-current circuit breakers), transducers, fault-current circuit breakers, relay and shielding parts, inductors, magnet amplifiers and magnetic heads as well as measurement devices. Processing properties: Formability: good Weldability: good

Properties

General

Property	Temperature	Value
Density	20.0 °C	8.6 g/cm³

Mechanical

Property	Temperature	Value	Comment
Elastic modulus	23.0 °C	137 - 145 GPa	Typical for Nickel Iron Alloy
Elongation	20.0 °C	5 - 40 %
Hardness, Brinell	20.0 °C	150 - 270 [-]
Poisson's ratio	23.0 °C	0.28 [-]	Typical for Nickel Iron Alloy
Tensile strength	20.0 °C	600 - 860 MPa
Yield strength Rp0.2	20.0 °C	290 - 800 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	23.0 °C	7.6E-6 - 1.7E-5 1/K	Typical for Nickel Iron Alloy
Melting point		1450 °C	Typical for Nickel Iron Alloy
Specific heat capacity	20.0 °C	460 J/(kg·K)
Thermal conductivity	20.0 °C	34 W/(m·K)

Electrical

Property	Temperature	Value
Electrical resistivity	20.0 °C	5.5E-7 Ω·m

Chemical properties

Property	Value
Carbon	0.05 %
Chromium	1.5 - 2.5 %
Copper	4 - 6 %
Iron	15 - 18 %
Manganese	1 %
Nickel	72.15 %
Silicon	0.3 %

DIN 17745 Grade NiFe46 – Low‑Expansion Nickel‑Iron Alloy for High‑Temperature Sealings DIN 17744 NiCr22Mo7Cu Solution-Annealed Alloy – High Corrosion Resistance & Excellent Weldability

Metal