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Some questions about bearing and bearing steel rust

wallpapers Tech 2020-12-16

Question 1: Will bearing steel rust?

Will rust. Bearing steel, including stainless steel, is rusty.

Although stainless steel is said to be stainless, it is actually rusty. In fact, there is no rust-free steel in the world!


Question 2: How does bearing steel rust?

The so-called stainless steel refers to different degrees of corrosion resistance.

Corrosion rate <0.01mm/y, considered as "complete corrosion resistance";

If the corrosion rate is less than 0.1mm/y, it is considered "corrosion-resistant";

If the corrosion rate is more than 0.1mm/y, it is considered "not corrosion-resistant", that is, ordinary steel.

Except for a small part of the bearing steel is stainless bearing steel, most of it is ordinary corrosion-resistant steel, so rust is not strange at all, it is normal.


Question 3: Why does the bearing rust?

Bearing rust is related to the material and use the environment. Bearing steel itself contains carbon components and will react with water vapour. If you want to prevent the bearing from rusting, you must do a good job of rust prevention. Or choose non-steel bearings.


Metal products are prone to rust after oxidation, and stainless steel bearings are no exception. There are many factors that affect its rust: such as the chemical composition and structure of the metal material itself; the surface finish (corrosion of the battery with poor oxygen concentration); the composition and pH value of the solution in contact with the metal surface; and many factors such as the environment in which it is located. All are the direct factors that make the bearing rust.


In addition, when we use bearings, do not directly touch objects with our hands, because when sweat contacts the bearing, a layer of sweat film will be formed on the bearing surface, which will cause electrochemical effects on the bearing and corrode the bearing. Therefore, we must use special tools such as special gloves or finger cots to pick up the bearings and do not touch them directly with hands.


Question 4: Will bearings made of GCr15 bearing steel rust in an outdoor environment?

Yes, it will rust very much like ordinary steel. The Cr content of this steel is too small. The value behind the bearing steel is the Cr content, the unit is one-thousandth, and the Cr content of GCr15 is only About 1.5%, if the Cr content is close to the 13% boundary, the rust prevention effect is better. For example, Cr12 (containing about 12% Cr) steel will not rust much.


Question 5: Can bearing steel prevent rust?

Although the content of Cr in bearing steel is relatively high, it has a certain anti-rust effect, but the Cr content of steel is small, and the Cr content of GCr15 is only about 1.5%. At this time, the Cr element plays a role in improving the mechanical properties of the steel. The Cr of steel is to improve the hardenability and not to prevent rust. Like ordinary metals, a humid environment can cause corrosion. Therefore, anti-rust measures for bearings and their parts are still very necessary.


Wuxi Spark Bearing Co., Ltd is a complete, one-stop bearing supplier and manufacturer. All bearings products are qualified and have passed the ISO 9001 certification. We have more than 12 years of experience in bearings, please contact us if necessary, we will reply to you as soon as possible.