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SEW 385 Grade Ni36 Soft Annealed (+A) – Ultra‑Low Expansion Alloy for Optics, Antennas & Measurement Tech

The alloy is used for pieces with very small expansion, for lens masks, antennas, parts for general measurement technology, as well as for bimetals (according to DIN 1715). The break point temperature (temperature at which a break point in the expansion-temperature-curve occurs) is 230 degrees C. The material has extremely low thermal expansion at 100 degrees C. The cupping index at 1mm thickness is 9.5mm.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

8.2 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

20.0 °C

137 GPa

100.0 °C

142 GPa

200.0 °C

141 GPa

300.0 °C

140 GPa

400.0 °C

138 GPa

500.0 °C

130 GPa

600.0 °C

120 GPa

Elongation

20.0 °C

30 %

Poisson's ratio

23.0 °C

0.29 [-]

Typical for Nickel Steel

Shear modulus

23.0 °C

76 GPa

Typical for Nickel Steel

Tensile strength

20.0 °C

440 - 640 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

50.0 °C

8E-7 1/K

100.0 °C

1.5E-6 1/K

150.0 °C

1.9E-6 1/K

200.0 °C

2.6E-6 1/K

300.0 °C

5.3E-6 1/K

400.0 °C

8.1E-6 1/K

500.0 °C

9.9E-6 1/K

600.0 °C

1.11E-5 1/K

Melting point

1316 - 1595 °C

Typical for Nickel Steel

Specific heat capacity

20.0 °C

515 J/(kg·K)

Thermal conductivity

-250.0 °C

2 W/(m·K)

-200.0 °C

6 W/(m·K)

-100.0 °C

10 W/(m·K)

20.0 °C

12.8 - 13 W/(m·K)

100.0 °C

14 W/(m·K)

200.0 °C

15.1 W/(m·K)

300.0 °C

16.1 W/(m·K)

400.0 °C

17 W/(m·K)

500.0 °C

18.1 W/(m·K)

600.0 °C

19.6 W/(m·K)

Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

7.6E-7 - 7.8E-7 Ω·m

100.0 °C

8.5E-7 Ω·m

200.0 °C

9.2E-7 Ω·m

300.0 °C

1E-6 Ω·m

400.0 °C

1.05E-6 Ω·m

500.0 °C

1.09E-6 Ω·m

600.0 °C

1.13E-6 Ω·m

Chemical properties

PropertyValue

Carbon

0.05 - 0.1 %

Manganese

0.5 %

Nickel

35 - 37 %

Silicon

0.3 - 0.5 %


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