Steel suitable for the manufacture of various types of rolling bearing rings and rolling bodies of work in different environments, collectively referred to as rolling (or ball) bearing steel. NSK Bearings can adapt to different working conditions such as low temperature, high temperature resistance, corrosion, antimagnetic, resistant to shock and vibration, bearing steel can be dedicated carbon chromium bearing steel can also be used to tool steel, structural steel, stainless steel and resistant hot steel. Currently the most widely used carbon chromium bearing steel. Very wide class of bearing steel, including steel, which is also widely used. In general, the bearing material used as internal requirements of the quality of steel is relatively high, in particular, require high uniformity of non-metallic inclusions and carbides. So, often using vacuum degassing, the special process of remelting, vacuum consumable electrode remelting production of bearing steel. Carbon chromium bearing steel usually has a high metallurgical quality, and also to create the ideal material for cold-working touch with, and precision measuring tools.
According to China's production and use of the practice of bearing steel, with reference to the status of similar foreign steel, chemical composition and properties of steel, bearing steel division as follows: carbon chromium bearing steel, chromium bearing steel, carburizing bearing steel, stainless steel bearings steel and high temperature bearing steel five categories, a total of 15 steel, of which seven standard steel, eight non-standard steel. Benxi Iron and class less steel, steel, relatively complete, basically meet the needs of SKF bearings in industrial production, production management convenience.
Bearing steel in most countries only four categories, China has increased the non-chromium bearing steel. Abroad usually keep 4 to 5 carbon chromium bearing steel. Similar steel GCr6, GCr9 hardenability, quenching prone to soft spots, have been eliminated. Order to improve the hardenability of the steel of the Mo element carbon chromium bearing steel, such as the United States, the 52100 Series 3 and 4; the Japan SUJ4, SUJ5; the Sweden SKF23, SKF25 steel. China is still no such steel. GCr9 retained in the bearing steel in China. Abroad have studied chromium bearing steel such as the United States in 1941 had studied in Japan in 1965 also made a reported, but they were not included in the standard. NTN Bearing this may be the sake of the poor performance because of its resistance to corrosion than chromium bearing steel. Existing foreign carburizing bearing steel steel, relatively complete, the application is also more widely, such as carburizing bearing steel in the United States the number of one-third of the total; Japan accounts for about 15%. Applicable to small, small and medium-sized, large and extra large bearing carburizing steel, in a foreign country more than ten currently only suitable for the manufacture of large bearing two carburizing steel, suitable for the manufacture of small and medium-sized FAG Bearings carburizing steel is still in the development and improvement of the status of stainless steel and high temperature bearing steel development; with foreign.
Carbon chromium steel and 9Cr18Mo steel part of the data, and other steel cutting performance from the other literature. INA Bearing Test methods for determination of wear resistance and contact fatigue properties are not yet standardized, behind each data indicate the test conditions.
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