Kobe Steel, Ltd.

Shunsuke Hori

Tetsushi Deura

Takashi Abiko

Eiji Otsuki

Tomoya Shinozaki

Michio Nishihara

When the density (D) of the inclusions whose major axis exceeds 5 &#x3bc;m observed in the axis position of a section perpendicular to the axial direction of a forged product is made 70 nos/cmor below and the radius of the forged product is made R, the ratio of the density (D) of the inclusions whose major axis exceeds 5 &#x3bc;m observed in the R/3 position from the axis position toward the radial direction and the density Dsatisfies an inequality (1) below.0.5&#x2266;&#x2266;1.50&#x2003;&#x2003;(1)

Growing community of inventors

Takasago, Japan

Shunsuke Hori