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

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Description

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.

Related Standards

Equivalent Materials

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Eigenschaften

Allgemein

Property	Temperature	Value	Comment
Dichte	23.0 °C	7.8 - 7.9 g/cm³ Show Material materials with Dichte of 7.8 - 7.9 g/cm³	Typical for Molybdenum Steel

Mechanisch

Property	Temperature	Value	Comment
Dehnung	20.0 °C	22 % Show Material materials with Dehnung of 22 %
Elastizitätsmodul	23.0 °C	200 - 215 GPa Show Material materials with Elastizitätsmodul of 200 - 215 GPa	Typical for Molybdenum Steel
Poissonzahl	23.0 °C	0.29 [-] Show Material materials with Poissonzahl of 0.29 [-]	Typical for Molybdenum Steel
Streckgrenze	20.0 °C	350 MPa Show Material materials with Streckgrenze of 350 MPa
Zugfestigkeit	20.0 °C	500 - 650 MPa Show Material materials with Zugfestigkeit of 500 - 650 MPa

Thermisch

Property	Temperature	Value	Comment
Koeffizient der thermischen Ausdehnung	23.0 °C	1.29E-5 1/K Show Material materials with Koeffizient der thermischen Ausdehnung of 1.29E-5 1/K	Typical for Molybdenum Steel
Schmelzpunkt		1382 - 1529 °C Show Material materials with Schmelzpunkt of 1382 - 1529 °C	Typical for Molybdenum Steel
Spezifische Wärmekapazität	23.0 °C	456 J/(kg·K) Show Material materials with Spezifische Wärmekapazität of 456 J/(kg·K)	Typical for Molybdenum Steel
Wärmeleitfähigkeit	23.0 °C	37 - 48 W/(m·K) Show Material materials with Wärmeleitfähigkeit of 37 - 48 W/(m·K)	Typical for Molybdenum Steel

Chemical properties

Property	Value
Chrom	0.2 % Show Material materials with Chrom of 0.2 %
Kohlenstoff	0.06 - 0.1 % Show Material materials with Kohlenstoff of 0.06 - 0.1 %
Mangan	1.5 - 1.8 % Show Material materials with Mangan of 1.5 - 1.8 %
Molybdän	0.3 - 0.4 % Show Material materials with Molybdän of 0.3 - 0.4 %
Niobium	0.05 % Show Material materials with Niobium of 0.05 %
Phosphor	0.02 % Show Material materials with Phosphor of 0.02 %
Schwefel	0.015 % Show Material materials with Schwefel of 0.015 %
Silizium	0.6 % Show Material materials with Silizium of 0.6 %
Stickstoff	0.02 % Show Material materials with Stickstoff of 0.02 %
Vanadium	0.1 % Show Material materials with Vanadium of 0.1 %