Comparison of the properties of two major materials of bearing steel

2024,01,04

Bearing steel is the most common material in the use of bearings, bearing steel is often used in two categories of materials are: carburized bearing steel (G20Cr2Ni4A) and high carbon chromium bearing steel (GCr15 / GCr15SMn / GCr18M0). According to the specific understanding, share about these two bearing steel material performance comparison, I hope you can recognize in the purchase of bearing materials, buy the most appropriate bearing steel.

Carburized Bearing Steel (G20Cr2Ni4A)

G20Cr2Ni4A bearing steel is a high-quality alloy carburized steel (low carbon C: 0.17 ~ 0.23) used in the manufacture of bearing parts of the carburized steel, bearing parts made of this type of steel, carburizing, quenching, tempering and other heat treatment processes, the surface has a high hardness (hardness > HRC60) and a certain degree of abrasion resistance as well as high contact fatigue strength, low carbon C: 0.17 ~ 0.23 ensures that its heart has good toughness (hardness > HRC33-48). 0.23 to ensure that the heart has good toughness (hardness > HRC33-48). This surface hardening heart with toughness characteristics, so that the carburized bearing steel is particularly suitable for shock load conditions can be stable work. In short, the advantages of carburized steel bearings are:

1, carburized quenched surface retains the state of compressive stress, good fatigue strength.

2, the ability to withstand impact loads, surface hardening layer has micro-cracks are not easy to expand to the internal. The surface has high hardness and low hardness of the heart (generally 35HRC ~ 40HRC), compared with high-carbon chromium bearing steel, has a better heart impact toughness.

The depth and concentration of carburizing can be adjusted according to the needs.

4、It is not limited by the size and wall thickness of the 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% of chromium, which is characterized by: relatively uniform and stable microstructure after heat treatment, high and uniform hardness, good wear resistance, high contact fatigue strength, good dimensional stability and corrosion resistance. After spheroidal annealing, its cutting and machining performance is good. This steel can meet the general operating conditions in the operation of the bearing requirements.

1, high-carbon chromium bearing steel is widely used around the world, the most commonly used grades are GCr15 and GCr15SiMn, in our country the amount of bearing steel accounted for more than 80% of the total amount of the steel, the two steel properties are basically the same, but the hardenability of the GCr15SiMn steel is better than the GCr15 steel, so for the larger size of the bearing parts, it is desirable to use GCr15SiMn steel.

2, GCr15 bearing steel used in large quantities in the manufacture of automobiles, tractors, tanks, aircraft and other engine bearings, machine tools, electric motors and other spindle bearings used in railroad vehicles, mining machinery, general-purpose machinery with bearings.

3, GCr15SiMn bearing steel is mainly used in the manufacture of large wall thickness bearings, such as a variety of large and very large bearings, mostly used in heavy machine tools and rolling mills without a large impact load on the working conditions.

4, due to GCr15SiMn steel crack sensitivity is greater, poor impact toughness, impact load for the thick-walled bearings can not fully meet the use of requirements, the Ministry of Railways first proposed passenger car bearings do not allow the use of GCr15SiMn steel, as well as for the large-walled rolling mill and mining bearings in the conditions of the impact load, GCr15SiMn steel is also limited to use. Now developed GCr18Mo high hardenability steel, and wear resistance. Its performance is superior to GCr15SiMn steel, can be used in railroad bearings, mill bearings, mining machinery bearings instead of GCr15SiMn steel.

Author:

Mr. Richard

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info@jiade-group.com

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