Nsk Corporation

Hiroki Yamada

Hideyuki Uyama

Atsushi Imai

Provided are a method for assessing hydrogen environment severity of a rolling device during operation and a method for predicting likelihood that white structure damage occurs to the rolling device as a result of operation. A hydrogen environment severity assessment method is a method for assessing, among operating conditions of a rolling device including two rolling members coming into rolling contact with each other and having at least one of the two rolling members being a steel rolling member, hydrogen environment severity, the hydrogen environment severity being an index representing magnitude of influence exerted by hydrogen. The hydrogen environment severity assessment method includes a measurement step of measuring the amount of room temperature non-diffusible hydrogen contained in a rolling fatigue region, the rolling fatigue region being a region where rolling fatigue has been produced by rolling contact, within the steel rolling member of the rolling device operated under the operating conditions and an assessment step of assessing the hydrogen environment severity, based on a measurement result in the measurement step.

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Fujisawa, Japan

Hiroki Yamada