DIN 17182 Grade G8MnMo7-4 quenched and tempered (+QT)
DIN 17182 Grade G8MnMo7-4 quenched and tempered (+QT) introduction
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.
Equivalent material: DIN 1.5430, EN G8MnMo7-4, EN 1.5430
DIN 17182 Grade G8MnMo7-4 quenched and tempered (+QT) general
| Property | Temperature | Value | Comment |
|---|---|---|---|
| Density | 23.0 °C | Density of 7.8 - 7.9 g/cm³ | Typical for Molybdenum Steel |
DIN 17182 Grade G8MnMo7-4 quenched and tempered (+QT) thermal
| Property | Temperature | Value | Comment |
|---|---|---|---|
| Coefficient of thermal expansion | 23.0 °C | Coefficient of thermal expansion of 1.29E-5 1/K | Typical for Molybdenum Steel |
| Melting point | - | Melting point of 1382 - 1529 °C | Typical for Molybdenum Steel |
| Specific heat capacity | 23.0 °C | Specific heat capacity of 456 J/(kg·K) | Typical for Molybdenum Steel |
| Thermal conductivity | 23.0 °C | Thermal conductivity of 37 - 48 W/(m·K) | Typical for Molybdenum Steel |
DIN 17182 Grade G8MnMo7-4 quenched and tempered (+QT) chemical
| Property | Value |
|---|---|
| Carbon | Carbon of 0.06 - 0.1 % |
| Chromium | Chromium of 0.2 % |
| Manganese | Manganese of 1.5 - 1.8 % |
| Molybdenum | Molybdenum of 0.3 - 0.4 % |
| Niobium | Niobium of 0.05 % |
| Nitrogen | Nitrogen of 0.02 % |
| Phosphorus | Phosphorus of 0.02 % |
| Silicon | Silicon of 0.6 % |
| Sulfur | Sulfur of 0.015 % |
| Vanadium | Vanadium of 0.1 % |
DIN 17182 Grade G8MnMo7-4 quenched and tempered (+QT) mechanical
| Property | Temperature | Value | Comment |
|---|---|---|---|
| Elastic modulus | 23.0 °C | Elastic modulus of 200 - 215 GPa | Typical for Molybdenum Steel |
| Elongation | 20.0 °C | Elongation of 22 % | - |
| Poisson's ratio | 23.0 °C | Poisson's ratio of 0.29 [-] | Typical for Molybdenum Steel |
| Tensile strength | 20.0 °C | Tensile strength of 500 - 650 MPa | - |
| Yield strength | 20.0 °C | Yield strength of 350 MPa | - |
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