We manufacture forging ingots, billets, and blooms in alloy steel specifically for SAE 8617, tailored for high-performance carburizing and engineering applications.
SAE 8617 is a low carbon nickel-chromium-molybdenum alloy steel designed primarily for case hardening applications. It provides an excellent combination of high surface hardness, strong core toughness, and superior fatigue resistance, making it ideal for components subjected to heavy loads and wear conditions.
The presence of nickel improves toughness and impact strength, while chromium enhances wear resistance and hardenability. Molybdenum contributes to strength retention at elevated temperatures and improves overall mechanical stability. SAE 8617 also offers good machinability in the annealed condition and excellent dimensional stability after heat treatment, making it widely used in automotive and heavy-duty engineering components.
This alloy steel delivers reliable performance, long service life, and cost-effective manufacturing for critical engineering applications.
| Element | Content (%) | Function / effect |
| Carbon (c) | 0.15 – 0.20 | Provides surface hardness after carburizing |
| Manganese (mn) | 0.70 – 0.90 | Improves strength and hardenability |
| Silicon (si) | 0.15 – 0.35 | Enhances strength and elasticity |
| Nickel (ni) | 0.40 – 0.70 | Improves toughness and impact resistance |
| Chromium (cr) | 0.40 – 0.60 | Improves wear resistance and hardenability |
| Molybdenum (mo) | 0.15 – 0.25 | Improves strength and heat resistance |
| Phosphorus (p) | Max 0.035 | Impurity; lower content improves toughness |
| Sulphur (s) | Max 0.040 | Improves machinability in controlled amounts |
The heat treatment process can be customized to achieve required case depth and Mechanical properties for specific engineering applications.
SAE 8617 has several international equivalents, including:
SAE 8617 offers an excellent balance of surface hardness, core toughness, and fatigue resistance. The addition of nickel enhances toughness, while chromium and molybdenum improve wear resistance and strength. This makes SAE 8617 highly suitable for carburized components operating under heavy loads and repeated stress. Its consistent hardenability and dimensional stability also help improve manufacturing efficiency and component reliability.
| Grade | Carbon (%) | Key applications | Heat treatment | Comments |
| SAE 8617 | 0.15-0.20 | Gears, shafts, automotive parts | Carburizing + q&t | Nickel improves toughness |
| En 353 | 0.17-0.22 | Transmission components | Carburizing + q&t | Widely used european grade |
| 20nicrmo2-2 | Similar | Heavy duty gears | Carburizing + q&t | High strength alloy steel |
| SAE 8620 | 0.18-0.23 | Automotive and engineering parts | Carburizing + q&t | Common carburizing steel |
SAE 8617 is a low carbon nickel-chromium-molybdenum alloy steel optimized for carburizing applications requiring high surface hardness and strong core toughness. It delivers dependable performance, long operational life, and excellent mechanical reliability for automotive and engineering components.