Stainless steel shields used in bearing applications must meet strict performance standards, not only due to their protective function, but also because of the demanding environments in which stainless steel bearings operate.
1. Corrosion Resistance
Stainless steel shields are typically made from 304 or 316 stainless steel, offering excellent resistance to corrosion caused by moisture, oxidation, and exposure to lubricants. In real-world applications, lubricating grease can oxidize over time, producing acidic compounds. These, along with additives such as extreme-pressure agents, may lead to chemical corrosion. Therefore, shields must be made from materials that can resist such aggressive agents.
2. Wear Resistance
Given the constant rotation and close proximity to moving parts, stainless steel shields must maintain shape and function over long periods. The material must offer good wear resistance to prevent surface degradation, especially in high-speed applications.
3. Fatigue Strength
To support long-term bearing operation under cyclic loads, the shield material must have high fatigue resistance. This includes the ability to withstand continuous vibration, thermal cycles, and mechanical stresses without cracking or deforming. Factors such as hardness, internal structure uniformity, and impact strength are critical.
4. Dimensional Stability
As precision components, stainless steel shields must maintain tight tolerances during both production and operation. Materials must offer excellent dimensional stability to ensure a consistent press-fit or interference fit with the bearing housing. This is essential to maintain sealing performance and prevent mechanical play or vibration.