We manufacture forging ingots, billets, and blooms in alloy steel specifically for SAE 8622, tailored for high-performance carburizing and engineering applications.
SAE 8622 is a low carbon nickel-chromium-molybdenum alloy steel designed for case hardening applications where high surface hardness and strong core toughness are required. It offers excellent fatigue strength, wear resistance, and load-bearing capacity, making it suitable for heavy-duty automotive and industrial components.
The presence of nickel enhances toughness and impact resistance, chromium improves wear resistance and hardenability, while molybdenum contributes to strength retention and resistance to tempering softening. SAE 8622 also provides good machinability in the annealed condition and maintains dimensional stability after heat treatment, making it suitable for precision engineered and forged components.
This steel provides reliable performance, durability, and cost efficiency for high-stress mechanical applications.
| Element | Content (%) | Function / effect |
| Carbon (c) | 0.20 – 0.25 | Provides surface hardness and strength 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 cycle can be adjusted to achieve desired case depth and Mechanical properties based on application requirements.
SAE 8622 has several international equivalents, including:
SAE 8622 offers higher carbon content compared to SAE 8620, providing improved strength and load-bearing capability while maintaining excellent toughness and fatigue resistance. Its nickel-chromium-molybdenum alloy composition ensures superior hardenability and consistent heat treatment response. This makes SAE 8622 highly suitable for heavy-duty carburized components operating under severe mechanical stress.
| Grade | Carbon (%) | Key applications | Heat treatment | Comments |
| SAE 8622 | 0.20-0.25 | Gears, shafts, heavy-duty parts | Carburizing + q&t | Higher strength variant of 8620 |
| SAE 8620 | 0.18-0.23 | Automotive transmission components | Carburizing + q&t | Widely used carburizing steel |
| SAE 8617 | 0.15-0.20 | Transmission and load-bearing parts | Carburizing + q&t | Slightly lower carbon grade |
| En 353 | 0.17-0.22 | Automotive gears and shafts | Carburizing + q&t | Popular european equivalent |
SAE 8622 is a low carbon nickel-chromium-molybdenum alloy steel optimized for carburized engineering components requiring enhanced strength, wear resistance, and core toughness. It delivers reliable mechanical performance, long service life, and efficient manufacturability for automotive and industrial applications.