Introduction to Rolling Bearing Steel

Source: China Bearing Network Time: 2014-09-13

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Suitable for making all kinds of rolling bearing rings and roll-over steels that work in different environments, collectively referred to as rolling (or ball) bearing steel. Because the bearing can be used to different working environments, such as low temperature, high temperature, rust resistance , anti-magnetic, anti-oscillation, etc., bearing steel can be used for special carbon-chromium bearing steel, can also use tool steel, structural steel, stainless steel and heat-resistant steel. The most widely used is carbon-chromium bearing steel. Because bearing steel contains The steel type is very wide, so the use is also relatively extensive. Generally speaking, when the inner bearing data is used, the quality of the demand steel is higher, especially for the uniformity of non-metallic inclusions and carbides. Therefore, often The special process of vacuum degassing, electroslag remelting, vacuum self-consumption and remelting is used to produce bearing steel. Carbon chromium bearing steel generally has high metallurgical quality, and is also an aspirational material for making cold work tools and fine measuring tools.
According to the theory of producing and using bearing steel in China, with reference to the status quo of similar foreign steels, the bearing steel is divided into: high carbon chromium bearing steel, chromium-free bearing steel, carburized bearing steel, stainless bearing according to chemical composition and steel characteristics. There are five categories of steel and medium and high temperature bearing steels, a total of fifteen steel grades, seven standard steel grades and eight non-standard steel grades. The steel grades are less and the steel grades are more complete, which is basically satisfactory for the bearing industry. Demand, production management and convenience.
In most countries, as long as there are four types of bearing steel, China has added chromium-free bearing steel. Generally, 4~5 high-carbon chromium bearing steels are preserved abroad. The similar hardening properties of GCr6, GCr9 and other similar steel grades are low, and softening is simple when quenching. Point, now has been screened. In order to improve the hardenability of steel, high-carbon chromium bearing steel with molybdenum element is presented, such as 3, 4 in the US 52100 series, SUJ4, SUJ5 in Japan, SKF23, SKF25 in Sweden, etc. Steel No. There is no such steel in China. GCr9 is preserved in China's bearing steel. Chromium-free bearing steel has also been studied abroad. For example, it was studied in the United States in 1941, and Japan also reported in 1965, but none of them were listed. Into the specification. This may be because it is worse than the corrosion resistance of chrome bearing steel. The existing carburizing bearing steel in foreign countries is more complete and the application is also more extensive, such as the amount of carburized bearing steel used in the United States. One third of Japan, Japan accounts for about 15%. The carburized steel grades for small, medium, small, large and extra large bearings are more than ten in foreign countries. At present, China is only suitable for the production of two large bearings. Carbon steel, and the carburized steel number suitable for making small and medium-sized bearings is still under development. The good, the stainless steel and high temperature similar to the current situation with foreign steel bearing undertaken.
Part of the data for high carbon chrome steel and 9Cr18Mo steel and the cutting function of other steel grades are taken from other literatures. Because the experimental methods for measuring wear resistance and touch fatigue function are not standardized, the experimental conditions are indicated after each data.

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