Bearing steel is the most common material used in bearings. There are two types of materials commonly used in bearing steel: carburized bearing steel (G20Cr2Ni4A) and high-carbon chromium bearing steel (GCr15/GCr15SMn/GCr18M0). According to the specific understanding, I will share the performance comparison of these two bearing steel materials. I hope that you can look for the most suitable bearing steel when purchasing bearing materials. Carburized bearing steel (G20Cr2Ni4A) G20Cr2Ni4A bearing steel is a high-quality alloy carburizing steel (low carbon C: 0.17~0.23) used to manufacture bearing parts. Bearing parts made of this type of steel are subjected to heat treatment processes such as carburizing, quenching, and tempering. Finally, the surface has high hardness (hardness>HRC60), certain wear resistance and high contact fatigue resistance, low carbon C: 0.17~0.23 ensures that the core has good toughness (hardness>HRC33-48 ). This surface hardened core has the characteristics of toughness, which makes carburized bearing steel especially suitable for stable work under the condition of large impact load. In summary, the advantages of carburized steel bearings are: 1. After carburizing and quenching, the surface retains a state of compressive stress and has good fatigue resistance. 2. The ability to bear impact load is strong, and the surface hardened layer has micro-cracks and is not easy to expand to the inside. The surface has higher hardness and the core hardness is lower (generally 35HRC~40HRC), compared with high-carbon chromium bearing steel, it has better core impact toughness. 3. The depth and concentration of carburizing can be adjusted as needed. 4. It is not limited by the size and wall thickness of bearing parts. High carbon chromium bearing steel (GCr15/GCr15SMn/GCr18M0) High-carbon chromium bearing steel is a high-carbon alloy steel containing 1.30~1.65% chromium. Its characteristics are: relatively uniform and stable microstructure after heat treatment, high and uniform hardness, good wear resistance, high contact fatigue strength, and good wear resistance. Dimensional stability and corrosion resistance. After spheroidizing annealing, its cutting performance is good. This kind of steel can meet the requirements of bearings operating under general working conditions. 1. High-carbon chromium bearing steel is widely used all over the world. The most commonly used grades are GCr15 and GCr15SiMn, which account for more than 80% of the total bearing steel in my country. The performance of these two steels is basically the same, but GCr15SiMn steel Hardenability is better than GCr15 steel, so for larger size bearing parts, GCr15SiMn steel should be used. 2. GCr15 bearing steel is widely used to manufacture engine bearings used in automobiles, tractors, tanks, airplanes, etc., spindle bearings used in machine tools, motors, etc., as well as bearings for railway vehicles, mining machinery, and general machinery. 3. GCr15SiMn bearing steel is mainly used to manufacture bearings with large wall thickness, such as various large and extra large bearings, and is mostly used in the working conditions of heavy machine tools and rolling mills without large impact loads. 4. Due to the high crack sensitivity and poor impact toughness of GCr15SiMn steel, thick-walled bearings with impact loads cannot fully meet the use requirements. The Ministry of Railways first proposed that GCr15SiMn steel is not allowed for passenger car bearings, and for large-walled GCr15SiMn steel is also limited to use in rolling mill and mine bearings under the condition of high impact load. Has been developed GCr18Mo high hardenability steel, and wear resistance. Its performance is superior to GCr15SiMn steel, and it can be used instead of GCr15SiMn steel in railway bearings, rolling mill bearings, and mining machinery bearings.  

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