公开(公告)号：US20170146061A1

公开(公告)日：2017-05-25

申请号：US15426694

申请日：2017-02-07

Applicant: NTN CORPORATION

Inventor： Noriaki MIWA ,  Takayuki KAWAMURA ,  Yoshinori SUGISAKI ,  Motohiro ITOU

IPC: F16C33/32 ,  F16C33/58 ,  F16C33/64 ,  F16C33/34

CPC classification number: F16C33/32 ,  F16C19/52 ,  F16C33/34 ,  F16C33/58 ,  F16C33/62 ,  F16C33/64 ,  F16C2204/60 ,  F16C2240/12 ,  F16C2240/48 ,  F16C2240/70 ,  G01M13/045 ,  G01N3/32 ,  G01N3/34

Abstract: A rolling component material of the present invention is a steel material for a rolling component to be used in an environment in which hydrogen enters steel, and is a material used for a rolling component of a rolling bearing, for example, a bearing ring. In the rolling component material, a non-metallic inclusion of the steel material has a radius not greater than a radius d determined by the following formula (1) and not less than 1.0 μm, where Pmax is defined as a maximum contact surface pressure acting on a rolling surface of the rolling component, d=64729(Pmax/4)−1.441  (1).

公开(公告)号：US20200340530A1

公开(公告)日：2020-10-29

申请号：US16923451

申请日：2020-07-08

Applicant: NTN CORPORATION

Inventor： Noriaki MIWA ,  Takayuki KAWAMURA ,  Yoshinori SUGISAKI ,  Motohiro ITOU

IPC: F16C33/32 ,  F16C33/34 ,  F16C33/64 ,  F16C19/52 ,  F16C33/62 ,  G01M13/045 ,  F16C33/58

Abstract: A method for selecting a steel material for a rolling component to be used in an environment in which hydrogen enters steel. The method includes determining a maximum contact surface pressure Pmax acting on a rolling surface of the rolling component, and using, as a material for the rolling component, a material whose inclusion has a radius not greater than a radius d determined by the following formula (1) and not less than 1.0 μm, d=64729(Pmax/4)−1.441   (1).