公开(公告)号：EP3677804A1

公开(公告)日：2020-07-08

申请号：EP18852268.4

申请日：2018-08-23

申请人： NTN Corporation

发明人： MIWA, Noriaki ,  SUGISAKI, Yoshinori

IPC分类号： F16C33/62 ,  F16C33/64 ,  C21D1/06 ,  C21D9/40 ,  C23C8/42

摘要： A rolling part (10) in one embodiment is a rolling part made of steel and including a quench-hardened layer (11) disposed at a surface (10a, 10b, 10c, 10d) of the rolling part. The hydrogen diffusion coefficient in the quench-hardened layer (11) is less than 2.6 × 10 -11 m 2 /s. The rolling part in one embodiment can suppress the occurrence of hydrogen embrittlement associated with the penetration of hydrogen from the surface.

公开(公告)号：EP3184836A1

公开(公告)日：2017-06-28

申请号：EP15833377.3

申请日：2015-08-10

申请人： NTN Corporation

发明人： MIWA, Noriaki ,  KAWAMURA, Takayuki ,  SUGISAKI, Yoshinori ,  ITOU, Motohiro

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

CPC分类号： 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

摘要： 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

摘要翻译： 本发明的滚动部件用材料是在氢进入钢中的环境下使用的滚动部件用钢材，是用于滚动轴承的滚动部件例如轴承圈的材料。 在滚动部件材料中，钢材的非金属夹杂物具有不大于由下式（1）确定的半径d且不小于1.0μm的半径，其中Pmax被定义为最大接触表面压力作用 在滚动部件的滚动表面上，d = 64729Pmax / 4-1.441