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Nickel-Chromium-Molybdenum Carburizing Steel
EN353/SAE 8620 / SAE 9310
EN353 is a premium nickel-chromium-molybdenum case hardening steel developed for components that need an exceptionally hard wear-resistant surface with a strong and shock-resistant core. It responds very well to carburizing and heat treatment, making it a preferred grade for gears, transmission shafts, pinions, bushes, sleeves, and other precision components exposed to repeated load and sliding contact. EN353 is widely chosen for automotive and heavy engineering applications where fatigue strength, core toughness, and surface durability are all critical.
Key Features
- Excellent carburizing and deep case hardening response
- High core toughness for shock-loaded components
- Strong surface wear and contact fatigue resistance
- Reliable hardenability through carburized sections
- Good machinability before final heat treatment
Main Applications
- Automotive gears, pinions, and crown wheels
- Transmission shafts, splines, and couplings
- Bushes, sleeves, gudgeon pins, and axles
- High-wear precision components and tooling parts
- Heavy engineering, mining, and drivetrain parts
International Standards Comparison
| DIN/WNr | EN Name | AISI/SAE | JIS | BS |
|---|---|---|---|---|
| 20NiCrMo5 | 20NiCrMo5 | 8620 | SNCM220 | EN353 |
Chemical Composition (Typical Analysis in %)
| C | Si | Mn | Cr | Ni | Mo |
|---|---|---|---|---|---|
| 0.10-0.20 | 0.10-0.35 | 0.30-0.90 | 0.45-1.00 | 0.75-1.25 | 0.10-0.20 |
Material properties & performance
- Surface Integrity: Carburizing produces a hard case with excellent wear life and tooth-contact strength.
- Fatigue Strength: Nickel-chromium-molybdenum alloying improves endurance under cyclic loading.
- Heat Treatment: Responds well to carburizing, oil quenching, and tempering cycles.