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Alloy 42

For best performance of low-expansion properties, up to 300°C, look no further than Alloy 42

Alloy 42 has been specifically manufactured to provide a controlled low-expansion alloy, which exhibits low thermal expansion from cryogenic temperatures up to 300°C.


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About Alloy 42

This material has been specifically manufactured for industrial applications where a low Coefficient of Thermal Expansion (CTE) is required. The constraints of the specifications limit the Sulphur and Phosphorus content of the material for increased weldability.

Features of Alloy 42 include:

  • Low expansion rate up to 300°C
  • Readily weldable
  • Easily Machined


8.11 g/cm³
Melting Point:
Curie temperature:
0.5 J/g K
Thermal Conductivity at 20°C:
10.5 J/cm.s°C
Modulus of Elasticity at 20°C:
150 MPa
Coefficient of Thermal Expansion:
30 – 300°C:
4.0 – 4.7 (10-6/°C)
30 – 450°C:
6.7 – 7.4 (10-6/°C)


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Chemical Analysis

Ni Fe C Mn S Si Cr Al P
% 41 Balance 0.05* 0.8* 0.025* 0.3* 0.25* 0.1* 0.025*

Typical Thermal Expansion

Alloy 42 versus Alloy 36 Thermal Expansion Chart


UNS Number:
Werkstoff Number:
DIN 17744, AFNOR NF A54-301
F30, B753
Download the Alloy 42 Data Sheet Download

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