We manufacture forging ingots, billets, and blooms in alloy steel specifically for 20CrNi6, developed for high-performance case hardening applications.
20CrNi6 is a low carbon chromium–nickel alloy steel designed to deliver a hard, wear-resistant surface combined with a tough and ductile core. This unique property combination makes it ideal for components subjected to high surface stress, shock loads, and repeated fatigue conditions.
The presence of chromium improves hardenability and wear resistance, while nickel enhances core toughness and impact strength. 20CrNi6 exhibits excellent machinability in the annealed condition and maintains dimensional stability after heat treatment, making it well suited for forging and precision machining operations.
This grade offers an excellent balance of strength, toughness, and long service life for demanding engineering and automotive applications.
| Element | Content (%) | Function / effect |
| Carbon (c) | 0.17 – 0.23 | Enables case hardening with a tough core |
| Manganese (mn) | 0.40 – 0.70 | Improves hardenability and strength |
| Silicon (si) | Max 0.40 | Enhances strength and elasticity |
| Chromium (cr) | 1.00 – 1.30 | Improves hardenability and wear resistance |
| Nickel (ni) | 1.40 – 1.70 | Increases toughness and fatigue resistance |
| Phosphorus (p) | Max 0.035 | Controlled impurity; improves toughness |
| Sulphur (s) | Max 0.035 | Controlled impurity; aids machinability |
Heat treatment cycles can be optimized to achieve the required case depth and core strength based on application needs.
20CrNi6 has several close international equivalents, including:
(exact properties may vary slightly depending on standard and heat treatment condition.)
20CrNi6 is an excellent choice for components that demand high surface hardness combined with a tough, shock-resistant core. Its superior fatigue resistance, reliable performance after case hardening, and ease of machining help reduce manufacturing costs while ensuring long service life.
| Grade | Carbon (%) | Key applications | Heat treatment | Comments |
| 20CrNi6 | 0.17 – 0.23 | Gears, shafts, transmission parts | Carburizing, quenching & tempering | Excellent toughness and wear resistance |
| 16CrNi4 | 0.14 – 0.19 | Automotive gears | Case hardening | Lower nickel content |
| En353 | 0.17 – 0.22 | Gear and pinion applications | Case hardening | Widely used carburizing steel |
| Aisi 8620 | 0.18 – 0.23 | Automotive and machinery parts | Case hardening | Common us equivalent |
20CrNi6 is a high-quality chromium–nickel alloy steel optimized for case hardening applications. It is widely used in automotive and engineering industries where wear resistance, toughness, and durability are critical.