Application Segments


Melting Route


Product Description

BÖHLER P804 is an iron-42% nickel alloy with low thermal expansion for applications in the electronics industry, for measuring devices (e.g. measuring rulers, scales), temperature measuring devices and temperature-dependent controls, thermostats, thermobimetals and expansion controllers. Other applications include core material for copper sheath wires, automotive and industrial lamps, transformer/capacitor bushings, electronic tubes, glass/ceramic to metal applications.
The minimum coefficient of thermal expansion of BÖHLER P804 is in the range of -30 to 275°C. Above the break point at just over 300°C, the coefficient of expansion increases sharply and at higher temperatures reaches the values usual for austenitic materials. Good low temperature properties.

Technical Specifications

Material Numbers

Ni 42 K94100



Chemical Composition

Chemical composition (average %)
max. 0.05 max. 0.30 max. 0.80 max. 0.025 max. 0.025 max. 0.25 41.0 to 43.0 max. INF max. 0.10 REM


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