Steel mills, foundries, and industrial drying ovens create the harshest operating environments for bearing assemblies. Temperatures exceeding 150°C, combined with shock loading and contamination, can reduce bearing life by 90% or more.
The Five Critical Factors
#1. High-Temperature Grease Selection Standard lithium-based greases break down above 120°C. For extreme environments, synthetic polyurea or PFPE greases maintain viscosity and film strength up to 250°C.
Howcroft Recommendation: Switch to SKF LGEP 2 or FAG Arcanol TEMP120 for applications above 150°C.
#2. Bearing Material Upgrades Standard chrome steel (52100) loses hardness above 150°C. Consider: - **Case-hardened steel** for moderate heat (up to 200°C) - **Stainless steel bearings** for corrosive high-temp environments - **Ceramic hybrid bearings** for extreme applications (250°C+)
#3. Seal Configuration Strategy High temperatures destroy standard nitrile seals. Options include: - **Labyrinth seals** for non-contact protection - **Viton seals** rated to 200°C - **Metal shields** for the harshest conditions
#4. Mounting Practices for Thermal Expansion Bearings expand at high temperatures. Always provide for axial thermal growth: - Use floating bearing arrangements - Ensure proper shaft-to-bearing fit (typically H7/js6) - Account for differential expansion in housing design
#5. Condition Monitoring Implementation High-heat bearings fail faster. Deploy: - **Vibration sensors** to detect early wear patterns - **Temperature monitoring** to identify lubrication breakdown - **Ultrasonic analysis** for seal integrity checks
Real-World Case Study: Steel Mill Roller Bearings
A Rotherham-based steel processor was replacing conveyor roller bearings every 6 weeks. After implementing our high-temp protocol:
- Upgraded to FAG spherical roller bearings with ceramic-enhanced cages
- Switched to PFPE synthetic grease
- Installed Viton seals and labyrinth shields
- Added vibration monitoring
Result: Bearing life extended to 18 months—a 1,200% improvement.
Quick Reference: Temperature-Grease Chart
| Operating Temp | Recommended Grease | Example Product |
|---|---|---|
| Up to 120°C | Lithium Complex | Standard EP2 |
| 120-180°C | Polyurea Synthetic | SKF LGEP 2 |
| 180-250°C | PFPE | FAG Arcanol TEMP120 |
| 250°C+ | Solid Lubricants | MoS₂ coated bearings |
Implementation Checklist
✓Identify all high-temperature bearing locations ✓ Measure actual operating temperatures (not ambient) ✓ Select appropriate bearing material and seals ✓ Source high-temp grease compatible with application ✓ Train maintenance team on proper installation ✓ Establish condition monitoring baseline
Need Expert Guidance?
Howcroft Group's technical team has 25 years of experience solving high-temperature bearing challenges. Contact us for a free facility assessment.
