EN 10085 Grade 31CrMo12 surface hardened

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Description

The nitriding steel 31 CrMo 12 can undergo quenchhardening and is used for heavy machine parts that are subjected to wear, have a high surface hardness and have a dimension of up to 250 mm. With parts for hot steam fittings such as valve spindles, it is used for dimensions of up to 100 mm and under highest pressure, the same with grinder valves and milling machine spindles. The steel contains a nitride agent (Cr) which contributes through the nitriding process or the nitro-carburization process with N or N and C to a higher: - case hardness - abrasion resistance - fatigue strength and - corrosion resistance. It is used for forged construction components: quench-hardened, mechanically processed and treated thermo-chemically (for example nitriding).

Related Standards

Equivalent Materials

This material data has been provided by WIAM.

"Typical" values were obtained via a literature search. "Predicted" values were imputed via artificial intelligence technology. While we have placed significant efforts in ensuring data accuracy, "typical" and "predicted" data should be considered indicative and verified by appropriate material testing. Please do contact us if additional information on the the predicted data method is required.
All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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Properties

General

PropertyTemperatureValue

Density

20.0 °C

7.83 - 7.85 g/cm³

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Mechanical

PropertyTemperatureValueComment

Elastic modulus

-100.0 °C

217 GPa

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20.0 °C

210 - 212 GPa

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100.0 °C

205 - 207 GPa

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200.0 °C

195 - 199 GPa

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300.0 °C

185 - 192 GPa

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400.0 °C

184 GPa

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500.0 °C

175 GPa

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600.0 °C

164 GPa

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Poisson's ratio

23.0 °C

0.3 [-]

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Typical for Steel

Thermal

PropertyTemperatureValue

Coefficient of thermal expansion

-100.0 °C

1.05E-5 1/K

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20.0 °C

1.15E-5 1/K

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100.0 °C

1.1E-5 - 1.21E-5 1/K

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200.0 °C

1.2E-5 - 1.27E-5 1/K

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300.0 °C

1.3E-5 - 1.32E-5 1/K

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400.0 °C

1.36E-5 - 1.4E-5 1/K

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500.0 °C

1.4E-5 1/K

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600.0 °C

1.44E-5 1/K

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Specific heat capacity

-100.0 °C

423 J/(kg·K)

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20.0 °C

440 - 461 J/(kg·K)

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100.0 °C

479 J/(kg·K)

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200.0 °C

499 J/(kg·K)

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300.0 °C

517 J/(kg·K)

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400.0 °C

536 J/(kg·K)

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500.0 °C

558 J/(kg·K)

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600.0 °C

587 J/(kg·K)

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Thermal conductivity

20.0 °C

25.7 - 36 W/(m·K)

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100.0 °C

27.4 W/(m·K)

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200.0 °C

28.5 W/(m·K)

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300.0 °C

28.9 W/(m·K)

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400.0 °C

28.5 W/(m·K)

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500.0 °C

27.7 W/(m·K)

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600.0 °C

26.8 W/(m·K)

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Thermal diffusivity

20.0 °C

7.1 mm²/s

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100.0 °C

7.1 mm²/s

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200.0 °C

6.9 mm²/s

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300.0 °C

6.6 mm²/s

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400.0 °C

6.1 mm²/s

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500.0 °C

5.3 mm²/s

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600.0 °C

4.5 mm²/s

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Electrical

PropertyTemperatureValue

Electrical resistivity

20.0 °C

1.8E-7 - 4.05E-7 Ω·m

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100.0 °C

4.67E-7 Ω·m

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200.0 °C

5.53E-7 Ω·m

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300.0 °C

6.5E-7 Ω·m

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400.0 °C

7.62E-7 Ω·m

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500.0 °C

8.92E-7 Ω·m

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600.0 °C

1.03E-6 Ω·m

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Chemical properties

PropertyValue

Carbon

0.28 - 0.35 %

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Chromium

2.8 - 3.3 %

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Manganese

0.4 - 0.7 %

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Molybdenum

0.3 - 0.5 %

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Nickel

0.3 %

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Phosphorus

0.03 %

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Silicon

0.4 %

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Sulfur

0.03 %

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