What is 1.8550 (34CrAlNi7-10)
The material 1.8550 (34CrAlNi7-10) is a high-quality, alloyed nitriding steel in accordance with DIN EN 10085, specifically developed for components subject to high wear and considered one of the high-performance nitriding steels used in mechanical engineering. Thanks to its excellent nitridability, it develops an extremely hard and wear-resistant surface layer while maintaining a tough core. This combination provides high surface hardness, excellent wear resistance, and reliable performance even under continuous loads.
International identifiers
Properties of the material 1.8550 (34CrAlNi7-10)
Mechanical properties
| Tensile strength Rm | ca. 900 - 1050 N/mm2 |
| Hardness (quenched and tempered) | ~300 HB |
| Elongation at break | ca. 11 % |
| Modulus of elasticity | ca. 190 GPa |
Special properties
- Very high wear resistance due to nitriding
- High surface hardness of up to approx. 950 HV / ~68 HRC
- Tough core after quenching and tempering
- Good fatigue strength and load-bearing capacity
- Good machinability in the soft-annealed condition
- Low distortion during nitriding
- Limited weldability
Processing
Due to its alloy composition, this material has limited weldability and is therefore primarily used for machined and heat-treated components.
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Heat treatment 1.8550
- Quenching and tempering: approx. 850–890°C
- Tempering: approx. 570–660°C
- Nitriding: approx. 500–540°C
- During nitriding, nitrogen is introduced into the surface layer, forming hard nitrides.
Advantages of nitriding:
- Extremely high surface hardness
- High wear resistance
- Improved corrosion resistance
- Minimal dimensional changes compared with other hardening processes
Chemical composition of 1.8550
| 1.8550 34CrAINi7-10 | C | Si | Mn | P | S | Cr | Mo | Ni | Al |
|---|---|---|---|---|---|---|---|---|---|
| min. | 0,30 | 0,4 | 1,5 | 0,15 | 0,85 | 0,8 | |||
| max. | 0,37 | 0,4 | 0,7 | 0,025 | 0,03 | 1,8 | 0,25 | 1,15 | 1,2 |
Areas of application for 1.8550
Instructions for use
- For highly stressed components subject to high wear
- When an extremely hard and wear-resistant surface combined with a tough core is required
- For applications requiring high fatigue strength and load-bearing capacity
- When a high surface hardness of up to approx. 950 HV / ~68 HRC is required
- When minimal distortion during nitriding is required
- For components that must perform reliably under continuous loads
- Good machinability in the soft-annealed condition
- Limited weldability should be taken into account
Areas of application
- Mechanical engineering, particularly highly stressed structural components
- Automotive industry, e.g. transmission components and shafts
- Plastics processing, e.g. screws and cylinders
- Drive technology, e.g. gears and pinion shafts
- Engine manufacturing, e.g. camshafts and piston rods
- Tool and mold making
Form of supply and availability of 1.8550
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.
![[Translate to Englisch:]](/fileadmin/user_upload/produkt-fotos/1.8550_Flachstahl.jpg "[Translate to Englisch:]")
![[Translate to Englisch:]](/fileadmin/user_upload/produkt-fotos/1.8550_Stahlblock.jpg "[Translate to Englisch:]")
Frequently asked questions about material 1.8550:
It is used wherever components are exposed to extreme wear and high drive loads.
It combines extreme surface hardness with a stable and tough core, and large cross-sections can be quenched and tempered.
In the quenched and tempered condition, it can be machined mechanically, but compared with standard quenched and tempered steels such as 1.7225 / 42CrMo4, it is more difficult to machine.
Notice: Specifications contained in following data sheet are provided as a description, liability is excluded!