Nippon Steel Corporation

Chihiro Kozuka

Toshiyuki Hata

Takanori Kato

Yuichiro Yamamoto

Akihito Yamane

Taizo Makino

Jun Noguchi

Shingo Abe

Yoshinari Yamamura

A wheel includes a boss, a rim, and a web. The rim includes a tread and a flange. A center of the rim in the axial direction of the wheel is disposed closer to the flange in the axial direction than a center of the boss in the axial direction is. The web has a plate-thickness center line that has a linear shape when the wheel is viewed in its longitudinal section. When an angle that the plate-thickness center line forms with the axial direction is denoted by a, a distance in the axial direction from a side face of the rim to an outer end of the plate-thickness center line is denoted by Pw, a length of the rim in the axial direction is denoted by Wr, and Pw/Wr is denoted by L, the wheel satisfies the expression L≥0.0223α−1.363. Where, the angle α is 90° or less.

Wheel for railway vehicle

The railway axle according to this disclosure has a pair of fitting portions and which each include a fitting portion hardened layer and a base metal portion, and a center parallel portion which includes a center parallel portion hardened layer and the base metal portion. The base metal portion has the chemical composition described in the description. In a region having the Vickers hardness of 480 HV or more in the center parallel portion hardened layer, a dislocation density ρ obtained based on a CoKα characteristic X-ray diffraction result is 2.5×10mor less, a half-value width B of the (211) diffraction plane is 1.34 degrees or less, and the dislocation density ρ and the half-value width B of the (211) plane obtained by X-ray diffraction satisfy Formula (1).(−4.8×10+8.5×10)/ρ≥1.00  (1)

Railway axle

Growing community of inventors

Tokyo, Japan

Chihiro Kozuka