DIN 17745 Grade NiFe46 – Low‑Expansion Nickel‑Iron Alloy for High‑Temperature Sealings

The expansion material NiFe46 with the material number 2.4475 is applied in sealings in soft glasses. It possesses a relatively low thermal expansion up to approximately 450 °C. (Temperature interval RT to 400 °C: coefficient of thermal expansion 9.8 to 10.6 10^-6 K^-1). . The alloy is of relative durability at normal temperatures in air with normal weather conditions as well as in fresh water and sea water. NiFe46 is well weldable by using the tungsten inert-gas method.

Properties

General

Property	Temperature	Value
Density	20.0 °C	8.3 g/cm³

Mechanical

Property	Temperature	Value	Comment
Elastic modulus	20.0 °C	155 GPa
Elongation	20.0 °C	3 - 30 %
Hardness, Brinell	20.0 °C	135 - 250 [-]
Poisson's ratio	23.0 °C	0.28 [-]	Typical for Nickel Iron Alloy
Tensile strength	20.0 °C	540 - 820 MPa
Yield strength Rp0.2	20.0 °C	240 - 810 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	100.0 °C	1.03E-5 1/K
	200.0 °C	1.02E-5 1/K
	300.0 °C	1.02E-5 1/K
	400.0 °C	1.01E-5 1/K
	500.0 °C	1E-5 1/K
	600.0 °C	1.05E-5 1/K

Melting point		1450 °C	Typical for Nickel Iron Alloy
Specific heat capacity	20.0 °C	500 J/(kg·K)
Thermal conductivity	20.0 °C	16.8 W/(m·K)

Electrical

Property	Temperature	Value
Electrical resistivity	20.0 °C	4.4E-7 Ω·m

Chemical properties

Property	Value
Carbon	0.02 %
Iron	46 - 49 %
Manganese	0.6 %
Nickel	50.08 %
Silicon	0.3 %

EN 10202 T550 Double-Reduced Soft Steel Sheet – High-Quality, Corrosion-Resistant DIN 17745 NiFe16CuCr: Premium Soft‑Magnetic Material for High‑Performance Transformers

Metal