DIN 17182 Grade G8MnMo7-4 quenched and tempered (+QT)

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In comparison to the unalloyed cast steel grades according to DIN 1681, the materials of this group show distinctly higher values of the notch impact energy. As a result of their low carbon content (0.23 per cent maximum), they are well suitable for welding. The material G8MnMo7-4 is applied in welded composite constructions for greater wall thicknesses. Because of its ability for precipitation hardening, the desired properties can be adjusted to a large extent without taking the wall thickness into account. The material possesses an extremely low carbon equivalent and, therefore, is still weldable without preheating and subsequent heat treatment with greater wall thicknesses, too. G8MnMo7-4, which shows high fatigue strength, is comparable with the fine-grain structural steel StE 355 or TSt E355. It is applied for big constructions in the offshore-area or in other building construction.

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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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23.0 °C

7.8 - 7.9 g/cm³

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Typical for Molybdenum Steel



Elastic modulus

23.0 °C

200 - 215 GPa

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Typical for Molybdenum Steel


20.0 °C

22 %

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Poisson's ratio

23.0 °C

0.29 [-]

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Typical for Molybdenum Steel

Tensile strength

20.0 °C

500 - 650 MPa

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Yield strength

20.0 °C

350 MPa

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Coefficient of thermal expansion

23.0 °C

1.29E-5 1/K

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Typical for Molybdenum Steel

Melting point

1382 - 1529 °C

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Specific heat capacity

23.0 °C

456 J/(kg·K)

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Thermal conductivity

23.0 °C

37 - 48 W/(m·K)

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Typical for Molybdenum Steel

Chemical properties



0.06 - 0.1 %

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0.2 %

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1.5 - 1.8 %

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0.3 - 0.4 %

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0.05 %

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0.02 %

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0.02 %

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0.6 %

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0.015 %

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0.1 %

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