Cast Bronze Bearing Material C90800 for Cement Industry

Applications, Performance, and Engineering Solutions

Introduction

In the cement industry, equipment operates under extreme conditions—heavy loads, low speeds, continuous vibration, abrasive dust, and elevated temperatures. Selecting the right bearing material is critical for ensuring long service life, reduced downtime, and stable operation.

Cast Bronze Bearing Material C90800, a high-tin bronze alloy, is widely used in cement machinery for heavy-duty sliding bearing applications. Thanks to its excellent wear resistance, load-carrying capacity, and machinability, C90800 bronze bearings offer reliable performance in harsh cement plant environments.

This article explores the typical application positions, working conditions, and optimized bearing solutions for C90800 cast bronze bearings in cement equipment.

What Is C90800 Cast Bronze?

C90800 is a cast tin bronze alloy, commonly used for plain bearings and bushings requiring high strength and good wear resistance.

Key Material Advantages

• High load-bearing capacity

• Excellent resistance to adhesive and abrasive wear

• Good corrosion resistance in humid and dusty environments

• Stable performance under low-speed and oscillating motion

• Excellent castability and machinability

These characteristics make C90800 especially suitable for low-speed, heavy-load sliding bearings in cement plants.

Typical Applications of C90800 Bronze Bearings in Cement Equipment

1. Rotary Kiln and Vertical Kiln End Bushings

Operating Conditions

• Low rotational speed, large shaft diameter

• High radial loads and thermal stress

• Continuous exposure to cement dust and fine particles

• Frequent start-stop cycles

Why C90800 Works

• High tin content improves wear resistance

• Good dimensional stability under load and heat

• Tolerant of imperfect lubrication conditions

Engineering Solutions

• Optimized wall thickness to reduce stress concentration

• Precision machining (Ra ≤ 1.6 μm) for stable oil film formation

• Integrated lubrication grooves and external grease nipples

2. Crusher and Roller Press Sliding Bearings

Operating Conditions

• Heavy impact loads and vibration

• Low speed, high contact pressure

Bearing Requirements

• High compressive strength

• Resistance to shock loads

• Long wear life

C90800 Bearing Design Recommendations

• Solid C90800 bronze bushings with reinforced structure

• Oil or grease lubrication depending on duty cycle

• Proper shaft-bushing clearance to maintain hydrodynamic lubrication

3. Conveyor Systems and Rotary Screen Pivot Bearings

Operating Conditions

• Oscillating or slow rotational motion

• Severe dust contamination

• Continuous vibration

Advantages of C90800

• Excellent wear resistance in boundary lubrication

• Strong resistance to fretting wear

Solution Highlights

• Bronze bushings combined with dust seals

• Grease lubrication with solid additives

• Flanged bushing designs to prevent axial displacement

4. Cement Mill Discharge End Bushings

Operating Conditions

• Elevated temperatures

• Sticky cement dust and abrasive particles

• Low-speed sliding contact

Optimized Bearing Solution

• C90800 bronze bushings with surface refinement

• High-temperature grease lubrication

• Controlled interference fit to prevent thermal seizure

Common Cement Equipment Problems and How C90800 Solves Them

Design and Selection Guidelines for Cement Industry Bearings

Shaft Fit and Clearance

• Typical fit: H7/g6 or H7/j6

• Clearance must allow oil film formation under heavy load

Lubrication Strategy

• Grease lubrication: Suitable for intermittent operation

• Oil circulation: Recommended for continuous, high-load duty

Proper lubrication grooves and oil distribution holes are essential.

Dust Protection

• Use radial seals or dust covers

• Consider labyrinth seals for extremely dusty areas

Surface Enhancement Options

For severe conditions:

• Surface hardening or precision grinding

• Composite bronze with solid lubricant inserts (graphite / PTFE)

Typical Upgrade Case: Cement Rotary Kiln Bearing

Original Design: Cast iron bushing
Upgraded Solution: C90800 cast bronze bearing with lubrication grooves

Results

• Significantly reduced wear rate

• Extended maintenance intervals

• Improved operational stability

Why Choose C90800 Bronze Bearings for Cement Plants?

C90800 cast bronze bearings are a proven, cost-effective solution for most heavy-load sliding bearing positions in cement machinery.

Conclusion

For cement plants facing challenges such as heavy loads, dust contamination, vibration, and thermal stress, C90800 cast bronze bearings provide a reliable and long-lasting solution. When combined with proper bearing design, lubrication systems, and sealing measures, C90800 significantly improves equipment reliability and reduces downtime.

If you need customized bronze bushings, bearing clearance calculations, or application-specific recommendations, C90800 can be engineered to meet your exact cement equipment requirements.