1.7218 / 25CrMo4
High-strength chromium-molybdenum steel for demanding mechanical components
Steel 1.7218 (25CrMo4) is a low-alloy chromium-molybdenum steel designed for mechanically stressed parts requiring a combination of strength, toughness, and reliable heat treatment response. Thanks to its balanced chemical composition, it offers good hardenability, very good mechanical properties after quenching and tempering, and dependable performance under dynamic loading.
This grade is widely used for components exposed to high mechanical stress, vibration, and repeated loading, where strength and toughness are both essential.
Properties of 1.7218 / 25CrMo4
⚙️ High strength and toughness
Suitable for components subjected to high loads and demanding operating conditions.
🔥 Excellent response to heat treatment
After quenching and tempering, the steel achieves high strength and good overall service performance.
🔩 Good hardenability
The chromium and molybdenum content allows effective hardening even in larger cross-sections.
✨ Good machinability in the annealed condition
Suitable for turning, milling, drilling, and other machining operations.
🛡️ Good resistance to dynamic stress
Well suited for parts exposed to shocks, vibration, and cyclic loading.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.22 – 0.29 |
| Si | ≤ 0.40 |
| Mn | 0.60 – 0.90 |
| Cr | 0.90 – 1.20 |
| Mo | 0.15 – 0.30 |
| P | ≤ 0.035 |
| S | ≤ 0.035 |
Typical applications
- shafts
- pins
- axles
- bolts and studs
- transmission parts
- heavily loaded machine components
- structural and mechanical parts for industrial use
Heat treatment (approximate values)
| Process | Temperature | Note |
|---|---|---|
| Soft annealing | 650 – 700 °C | improved machinability |
| Normalizing | 850 – 880 °C | structure homogenization |
| Quenching | 830 – 870 °C | oil |
| Tempering | 540 – 680 °C | depending on required strength and toughness |
Mechanical properties
- Tensile strength after heat treatment: approx. 800 – 1100 N/mm²
- Good toughness
- Good fatigue resistance
- Good hardenability
- Suitable for highly stressed machine parts
