Question 1: Will bearing steel rust? 

Will rust.Bearing steel, including stainless steel, rusts.

Although stainless steel is known as stainless, it is also rusty, in fact, there is no stainless steel in the world!

Question two: how does the bearing steel rust? 

The so-called stainless steel, refers to the degree of corrosion resistance is different.

When the corrosion speed is less than 0.01mm/y, it is considered "completely corrosion resistant".

Corrosion speed < 0.1mm/y, it is considered "corrosion resistance";

Corrosion speed > 0.1mm/y, it is considered "corrosion resistance", that is, general steel.

Bearing steel is mostly ordinary corrosion resistant steel in addition to a small part of stainless bearing steel, so it is not strange and normal to rust.

Question three: why do bearings rust? 

Bearing rust is related to the material and the use environment. Bearing steel itself contains carbon components, and will react when it encounters water vapor.If you don't want the bearing to rust, you should do a good job of anti-rust treatment.Or choose non-steel bearings.

Metal products are easy to rust after oxidation, and stainless steel bearings are no exception.There are many factors affecting its rust: such as the chemical composition and structure of the metal material itself;Surface finish (oxygen concentration difference battery corrosion);Solution composition and pH value in contact with metal surface;As well as its environment and many other factors, these are the direct factors that make bearings rust.

In addition, when we use bearings, do not contact objects directly with your hand, because when sweat and bearing contact, a layer of sweat film will be formed on the surface of the bearing, sweat film will cause electrochemical effect on the bearing and corrode the bearing.Therefore, we should use special gloves or finger gloves and other special tools to take bearings, do not contact directly with the hand.

Question 4: Will steel bearings of GCR15 bearings rust in the outdoor environment?

Will, but also, and the general steel samples will rust heavily, the Cr content of the steel is too little, the value of the back of the bearing steel is the Cr content, the unit is one over one thousand, the Cr content of GCr15 only around 1.5%, Cr content if I can close to 13% in this line, antirust effect is better, such as Cr12 around (including Cr12%) of steel is basic doesn't rust.

Question 5: Can bearing steel be rust-proof?

Although the content of Cr in bearing steel is relatively high, it has a certain antirust effect, but the content of Cr in steel is low, and the content of Cr in GCr15 is only about 1.5%. At this time, the Cr element plays a role in improving the mechanical properties of steel. The Cr in bearing steel is to improve hardenability, not to prevent rust.As with other metals, rust can be caused by humidity.Therefore, anti-rust measures of bearings and their parts are very necessary.

Question six: the method to prevent bearing rust?

1, surface cleaning method:

Cleaning must be based on the nature of the antirust surface and the conditions at that time, the appropriate method is selected.The commonly used solvent cleaning method, chemical treatment cleaning method and mechanical cleaning method.When the surface is dry and cleaned, it can be dried with filtered dry compressed air, or dried with a dryer of 120~170℃, and can also be dried with clean gauze.

2. Method of coating antirust oil

(1) immersion method: some small bearings are soaked in antirust grease and adhered to the surface of a layer of antirust grease.Oil film thickness can be achieved by controlling the temperature or viscosity of antirust grease.

(2) Brush coating method: for large bearings that are not suitable for soaking or spraying, it is necessary to pay attention not only to avoid accumulation, but also to prevent leakage of coating.

(3) spray method: some large bearings can not be oiled by immersion method, generally with about 0.7Mpa pressure of filtered compressed air in clean air for spraying.Spray method is applicable to solvent diluent antirust oil or thin layer antirust oil, but must adopt perfect fire protection and labor protection measures.