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DIN 17224 X12 CrNi 17/7 – Premium Spring‑Hard Stainless Steel for High‑Performance Applications

The stainless steel X 12 CrNi 17 7 is usually used cold strained as wire up to 10 mm diameter or strip up to 1,6 mm thickness for springs or spring parts, also under corrosion stress and little raised temperatures.

Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.92 g/cm³

Mechanical

PropertyTemperatureValueComment

Elastic modulus

-100.0 °C

206 GPa

20.0 °C

196 GPa

100.0 °C

190 GPa

200.0 °C

182 GPa

300.0 °C

174 GPa

400.0 °C

166 GPa

500.0 °C

158 GPa

600.0 °C

150 GPa

700.0 °C

142 GPa

800.0 °C

134 GPa

Poisson's ratio

20.0 °C

0.28 [-]

Reduction of area

20.0 °C

40 %

Shear modulus

23.0 °C

77 GPa

Typical for Austenitic Stainless Steel

Tensile strength

20.0 °C

1250 - 2450 MPa

Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

-100.0 °C

1.49E-5 1/K

20.0 °C

1.61E-5 1/K

100.0 °C

1.67E-5 1/K

200.0 °C

1.72E-5 1/K

300.0 °C

1.77E-5 1/K

400.0 °C

1.81E-5 1/K

500.0 °C

1.84E-5 1/K

600.0 °C

1.88E-5 1/K

700.0 °C

1.91E-5 1/K

800.0 °C

1.94E-5 1/K

Max service temperature, long

-100 - 270 °C

Melting point

1230 - 1480 °C

Typical for Austenitic Stainless Steel

Specific heat capacity

-100.0 °C

440 J/(kg·K)

20.0 °C

472 J/(kg·K)

100.0 °C

487 J/(kg·K)

200.0 °C

503 J/(kg·K)

300.0 °C

512 J/(kg·K)

400.0 °C

520 J/(kg·K)

500.0 °C

530 J/(kg·K)

600.0 °C

541 J/(kg·K)

700.0 °C

551 J/(kg·K)

800.0 °C

559 J/(kg·K)

Thermal conductivity

-100.0 °C

11.7 W/(m·K)

20.0 °C

14.5 W/(m·K)

100.0 °C

16 W/(m·K)

200.0 °C

17.6 W/(m·K)

300.0 °C

19.1 W/(m·K)

400.0 °C

20.4 W/(m·K)

500.0 °C

21.9 W/(m·K)

600.0 °C

23.3 W/(m·K)

700.0 °C

24.7 W/(m·K)

800.0 °C

26.1 W/(m·K)

Thermal diffusivity

-100.0 °C

3.7 mm²/s

20.0 °C

3.9 mm²/s

100.0 °C

4.3 mm²/s

200.0 °C

4.3 mm²/s

300.0 °C

4.6 mm²/s

400.0 °C

4.7 mm²/s

500.0 °C

4.9 mm²/s

600.0 °C

5 mm²/s

700.0 °C

5.3 mm²/s

800.0 °C

5.7 mm²/s

Electrical

PropertyTemperatureValue

Electrical resistivity

-100.0 °C

5.86E-7 Ω·m

20.0 °C

6.92E-7 Ω·m

100.0 °C

7.58E-7 Ω·m

200.0 °C

8.36E-7 Ω·m

300.0 °C

9.07E-7 Ω·m

400.0 °C

9.73E-7 Ω·m

500.0 °C

1.02E-6 Ω·m

600.0 °C

1.06E-6 Ω·m

700.0 °C

1.1E-6 Ω·m

800.0 °C

1.13E-6 Ω·m

Chemical properties

PropertyValue

Carbon

0.12 %

Chromium

16 - 18 %

Manganese

2 %

Molybdenum

0.8 %

Nickel

6 - 9 %

Phosphorus

0.05 %

Silicon

1.5 %

Sulfur

0.03 %

Technological properties

Property
Features

Spring


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