The rolling bearings of wind energy systems have to attain very long service life under harsh operating conditions. To overcome this challenge, NSK set about developing its Super-Tough (Super-TF) bearing steel, a proprietary material for very high load applications. NSK commissioned DNV GL to verify rolling bearings made of Super-TF with respect to ISO 281:2001 (Rolling bearings – Dynamic load ratings and Rating life).
The verification confirmed NSK's published specifications and, in a Statement of Conformity dated 15.11.2017, certified that when Super-TF material is used, the basic dynamic load rating can be improved by 23% in roller bearings and 26% in ball bearings. One of the factors enhancing the performance of Super-TF is its proven ability to reduce surface-induced wear from contaminated lubricant. In addition, the material prevents or retards the appearance of white etching cracks (WEC).
