1.8515 (31CrMo12) Material Data Sheet

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1.8515 (31CrMo12) Material Data Sheet

International identifiers
BS 722M24, SS 2240, AFNOR 30CD12, 25H3M

This material belongs to the group of nitriding steels, which due to its chemical composition is also suitable for higher nitriding hardness.

The industries which most common use material 1.8515 are the automotive and mechanical engineering industries. Especially if the application requires surfaces that can withstand high wear.



This material is found in general mechanical engineering as well as in the automotive industry or in extrusion technology.


Areas of applications:

Usually, this material is used for extruders, cylinders, racks, but also for connecting rods and other components with a relatively large cross-section.

1.8515 Material Data Sheet Download

Weldabilitynot weldable
Corrosion resistancelow
Wear resistancevery good

Hot forming: hot forming, for example: Forging is usually carried out between 1100°C - 900°C.

Heat treatment

Soft annealing: The material 1.8515 is annealed at temperatures of 650°C - 700°C. This is followed by a slow cooling. This gives a maximum hardness (Brinell) 248.

Heat treatment: The tempering takes place at 870°C - 930°C, followed by quenching in oil.

Tempering: Temperatures from 580°C to 700°C are required to start the engine.

Nitriding: The material 1.8515 is nitrided at temperatures of 480°C - 570°C.





Physical Properties:

Density in kg/dm37,73
Electrical resistance at 20°C in (Ω mm2)/m 0,19
Elasticity modus (103 MPa)210
Thermal conductivity at 20°C in W/(m K)42
Specific heat capacity at 20°C in J/(kg K)430

Mechanical properties:

Hardened and tempered

Yield strengthElongationImpact strengthTensileHardness
min. 675 N/mm2min. 10%min. 25 J880-1180 N/mm2276-339 HB

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Chemical composition


min.0,28 0,4  2,80,3
In stock

flat, forged, quenched and tempered

Advantages of saw cut

The processing with the saw is a mechanical processing of the material, which results in a significantly lower unintended deformation and increased hardness for the existing structure, such as the thermal cutting. Thus, the machined workpiece has a homogeneous structure even at the edge, which does not change in the continuation of the material.

This circumstance allows immediate finishing of the workpiece with milling or drilling . So it is not necessary to anneal the material or make a similar operation beforehand.

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Notice: Specifications contained in following data sheet are provided as a description, liability is excluded!