Bearing is the important basis for all kinds of machinery and equipment parts, its precision, performance, long life, and reliability to the precision, performance, service life and reliability of the host plays a decisive role. In mechanical product, bearing a high precision product, thus bearing a representative national strength in science and technology products. Bearing power of today′s world led by Europe, the United States and Japan, the global bearing market, high-end products occupy an absolute advantage.
Bearing material common stainless steel bearings used around the world is a very popular question. Early use of X110Cr17Mo FAG company (9Cr18Mo), in the 1980 of the 20th century X45Cr13 (4Cr13), late in the 90 ′s the use of X65Cr13 (6Cr14Mo) manufacture of rings, ball has been made using X110Cr17Mo. NMB′s stainless steel products, all using the DD400 (equivalent of FAG company X65Cr13), allegedly as compared to 9Cr18Mo, the DD400 has quenched hardness, long life, high capacity advantages, due to quenching and tempering carbon is spherical fine after distribution, to obtain the approximate surface roughness and waviness in steel GCr15, could be used to manufacture stainless steel bearing with low noise.
Stainless steel miniature ball bearings are widely used in instrument and appliance industry, for disk drive spindle for micro bearings, however, since its at least as P4, P2 level, even for non-repeating radial runout shall not be greater than 0.2um. Such a requirement for high accuracy, the traditional 9Cr18 and 9Cr18Mo steel is difficult to achieve. It is in this context, successfully developed the DD400 in order to meet the requirements for HDD bearing on high performance stainless steel. According to the ASTM-A380 test result, corrosion resistance and 440C (9Cr18Mo). In addition, DD40 manufacturing cost and manufacturability is also much better than 440C. In this way, Europe and the United States have developed a similar steel products as an alternative to replacing the 440C materials, widely used in common stainless steel bearings, promotes the development of stainless steel bearings.