Suitable for manufacturing in different environment all kinds of rolling bearing collar and a body of steel rolling, collectively referred to as rolling (or ball) bearing steel. NSK bearings can adapt because of work environment different, such as low temperature, high temperature resistant, corrosion, and the magnetic, resistance to impact and vibration, bearing steel can be special carbon chromium bearing steel, also can use tool steel, structural steel, stainless steel and heat resistant steel. At present the most widely used is carbon chromium bearing steel. Because of the steel bearing steel include very wide, so use also is widely used. Generally speaking, for use in bearing material, the requirements of high quality steel,, especially for non-metallic inclusions and the uniformity of carbide demand is high. So, often use the vacuum takes off the gas and electricity slag remelting, vacuum from consumption, and other special process remelting production bearing steel. Carbon chromium bearing steel usually has the high quality of metallurgy, is also making cold with precision measuring tools and touch the ideal material.

According to China's production and use the practice of bearing steel, with reference to the present situation of the foreign similar steel, according to the characteristics of the chemical composition and steel, bearing steel is divided into: high carbon chromium bearing steel, no chrome bearing steel, carburizing bearing steel, stainless bearing steel and high temperature bearing steel, in five categories, altogether 15 GangHao, seven of them a standard GangHao, eight the standard GangHao. Such kind GangHao benxi steel less, a relatively complete, basically meet the needs of the production of the bearing industry SKF, production management convenient.

 
Most of the state bearing steel only four kinds of, our country is increasing chrome bearing steel. Foreign usually keep 4 ~ 5 high carbon chromium bearing steel. GCr6, GCr9 and similar GangHao its quench-hardening ability of low, hardened prone to soft point now, have been eliminated. In order to improve its quench-hardening ability of steel, appeared and molybdenum elements of high carbon chromium bearing steel, such as America's 52100 department of 3, 4; Japan's SUJ4, SUJ5; Sweden's SKF23, SKF25 GangHao etc. China is still no such GangHao. In our country's bearing steel remain a GCr9. Also studied abroad without chrome bearing steel, such as the United States in 1941 have studied, Japan in 1965 also made a report, but are not included in the standard. This may be because it NTN bearing than chrome bearing steel corrosion resistance performance because of the poor. Foreign existing carburizing bearing steel GangHao relatively complete, applications are more extensive, such as the use of American carburizing steel bearing the number of one third of the total; Japan accounted for about 15%. Apply to small, small and medium, large and super large bearing carburizing steels number, in abroad have ten or more, our country at present the only suitable for large bearing manufacturing two carburizing steels number, and is suitable for the manufacturing of the small and medium-sized FAG bearing carburizing steels, is still in development and perfection; Stainless bearing steel and high temperature in the present situation and development of foreign similar.



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