What is 1.8519 (31CrMoV9)
The steel 1.8519 is an alloyed, tempered nitriding steel and is characterized by its high wear resistance with its low-ferrite tempering structure. The small amount of alloy of the elements molybdenum and vanadium improves the temper resistance and reduces the sensitivity to temper embrittlement.
The 1.8519 is surface hardenable with an achievable nitriding hardness of 800 HV (Vickers hardness), but very difficult to weld. Flame and induction hardening would also be possible to change the surface hardness as desired. The strength and hardness values achieved by this high-performance steel are stable even under operating conditions up to a little over 500°C.
The material 1.8519 is the standard nitriding steel with a lower nickel content than 1.8550.
International identifiers
Properties of the material 1.8519 (31CrMoV9)
Mechanical properties
| Tensile strength Rm | 900 -1100 N/mm2 |
| Brinell hardness | 284 - 346 HB |
| Yield strength Rp0.2 | > 700 N/mm? |
| Strain | >11% |
| Fracture reduction | >45% |
Physical properties
| Density (kg/dm3). | 7,75 bis 7,85 |
| Elasticity modus (kN/mm2) | 210 155 (bei 600°C) |
| Electrical resistance at 20°C (Q mm2/m) | 0,19 |
| Specific heat capacity at 20°C (J/kg K) | 441 |
| Coefficient of thermal expansion (10-6 m/(m K)) | 12,1 (20°C bis 100°C) 13,6 (20°C bis 400°C) |
Special properties
- Very high wear resistance
- High compressive strength with defined toughness and controllable surface hardness
Calculate the weight quickly and easily
Heat treatment 1.8519
| Temperature | Cooling | Result | |
| Soft annealing | 680-720 °C | slowly | max. 248 HB |
| Hardening | 840-880 °C | Oil or water | |
| Tempering | 570-680 °C | air | |
| Relaxation | 550-580 °C |
Chemical composition of 1.8519
| 1.8519 31CrMo V9 | C | Si | Mn | P | S | Cr | Mo | Ni | V |
| min. | 0,27 | 0,4 | 2,3 | 0,15 | 0,1 | ||||
| max. | 0,34 | 0,4 | 0,7 | 0,025 | 0,035 | 2,7 | 0,25 | 0,6 | 0,2 |
Areas of application for 1.8519
Areas of application
- General mechanical engineering
- Automotive industry
- Valve and fittings manufacturing
- Plant engineering
- Connecting rods
- Gears
- Crankshafts
Instructions for use
- Suitable for components subject to high mechanical requirements.
- In terms of its chemical composition, 1.8519 is directly comparable to 1.7707 (30CrMoV9).
- In suitable applications, 1.8519 can be replaced by 1.7707.
Form of supply and availability of 1.8519
In stock
Immediately available from stock
Form of supply
Flat, forged, quenched and tempered
Sawn blank
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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Frequently asked questions about material 1.8519:
It is a high-strength, aluminum-free nitriding steel. After nitriding, it develops an extremely wear-resistant surface, while the core remains exceptionally tough and load-bearing, with a tensile strength of up to 1,300 N/mm².
It is typically used for extremely highly stressed, dynamically loaded components in mechanical and automotive engineering. These include gearbox components, racks, and components used in extrusion technology.
No. With approximately 2.5% chromium, it is not corrosion-resistant and requires additional protection.
Notice: Specifications contained in following data sheet are provided as a description, liability is excluded!