Detailed bearing steel

      Bearing steel is steel used to make balls, rollers and bearing rings. Bearings are subjected to extreme pressure and friction during operation, so bearing steels are required to have high and uniform hardness and wear resistance, as well as high elastic limits. The uniformity of the chemical composition of the bearing steel, the content and distribution of non-metallic inclusions, the distribution of carbides, etc. are very strict. The bearing steel is also called high carbon steel. The carbon content of Wc is about 1%, and the amount of lanthanum is Wcr. 0.5% - 1.65%.
The physical properties of bearing steel are mainly based on inspection of microstructure, decarburization layer, non-metallic inclusions and low-fold structure. In general, it is delivered by hot rolling annealing and cold drawing annealing. The delivery status should be stated in the contract. The low-magnification of steel must be free of shrinkage, subcutaneous bubbles, white spots and microscopic pores. The center is loose, generally loose, no more than 1.5, and segregation must not exceed 2. The annealed structure of the steel should be a uniformly distributed fine-grained pearlite. Decarburization depth, non-metallic inclusions and carbide non-uniformity shall comply with the relevant national standards.
Bearing steel is divided into six categories: high carbon 硌 bearing steel, 硌 bearing steel, carburized bearing steel, stainless bearing steel, medium and high temperature bearing steel and anti-magnetic bearing steel.
1 high carbon chromium bearing steel, with the symbol "G" in the head of the grade, but does not indicate the carbon content. The chromium content is in parts per thousand and the other alloying elements are expressed as the alloy content of the alloy structural steel. For example, a bearing steel with an average chromium content of 1 □ 50% is indicated by the name “GCr15”.
2 carburized bearing steel, using the alloy structural steel branding method, and the symbol "G" in the head of the brand. For example: "G20 CrNiMo". Premium high quality carburized bearing steel with "A" at the end of the grade. For example: "G20CrNiMoA".
3 high carbon chromium stainless bearing steel and high temperature bearing steel, using stainless steel and heat resistant steel grades, the brand head is not marked with "G". For example: high carbon chromium stainless bearing steel "9Cr18" and high temperature bearing steel "10Cr14Mo".

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