The choice of bearing material affects the performance of the bearing
When examining the advantages of chrome steel and stainless steel as bearing materials, it was found that they are not only rust-proof. Chrome steel is the most common bearing material. It's harder than stainless steel so it lasts longer. However, at higher temperatures, its performance is not so good.
At a high temperature of 120C, it undergoes huge deformation and the load decreases. It can endure the high temperature of 150C continuously, but the temperature of 150C or higher in an instant will reduce the life of the bearing. Heat treatment can make the bearing withstand the high temperature of 170C instantly.
The most common type of stainless steel used for bearings is 440, which is hard and strong enough to carry loads, (20% less than brass steel), but it is rust-resistant and can withstand instantaneous high temperatures of 250C and continuous high temperatures of 300C. We often mistakenly think that all stainless steel is non-magnetic, and 440 stainless steel is magnetic. It is not completely anti-rust, but is affected by salt, acid and alkali. The 316 grade has good anti-rust performance and is not magnetic, but it is relatively soft so the load is small. Because it is not firm, the 316 bearing is not accurate and feels rough.
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