We manufacture forging ingots, billets, and blooms in alloy steel specifically for SAE 8620, tailored for high-performance carburizing and engineering applications.
SAE 8620 is a low carbon nickel-chromium-molybdenum alloy steel widely used 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 high wear and cyclic loading conditions.
Nickel enhances toughness and impact strength, chromium improves hardenability and wear resistance, while molybdenum increases strength and heat resistance. SAE 8620 also offers good machinability in the annealed condition and excellent dimensional stability after heat treatment, making it one of the most widely used carburizing steels in automotive and heavy engineering industries.
This steel delivers reliable performance, long service life, and cost-effective manufacturing for critical engineering components.
| Element | Content (%) | Function / effect |
| Carbon (c) | 0.18 – 0.23 | 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 tailored to achieve the desired case depth and Mechanical properties depending on application requirements.
SAE 8620 has several international equivalents, including:
SAE 8620 offers an outstanding balance of surface hardness, core toughness, and fatigue resistance. The nickel-chromium-molybdenum alloy system provides excellent hardenability and mechanical reliability. Its consistent heat treatment response and dimensional stability make it a preferred choice for carburized components subjected to high loads and repetitive stress while maintaining cost efficiency.
| Grade | Carbon (%) | Key applications | Heat treatment | Comments |
| SAE 8620 | 0.18-0.23 | Gears, shafts, automotive parts | Carburizing + q&t | Widely used carburizing steel |
| SAE 8617 | 0.15-0.20 | Gears and transmission components | Carburizing + q&t | Slightly lower carbon variant |
| En 353 | 0.17-0.22 | Automotive transmission parts | Carburizing + q&t | Popular european grade |
| 20nicrmo2-2 | Similar | Heavy duty gears | Carburizing + q&t | High strength alloy steel |
SAE 8620 is a low carbon nickel-chromium-molybdenum alloy steel optimized for carburized engineering components requiring high surface hardness and strong core strength. It delivers dependable performance, long operational life, and excellent mechanical reliability for automotive and heavy-duty engineering applications.