| 摘要 |
A clutch member and a process for manufacturing the same. In the clutch member, a steel sheet has an initial composition of 0.32 to 0.38% of C, 0.15% or less of Si, 0.3 to 0.5% of Mn, and 0.16 to 0.60% of Cr, by mass; and has an initial uniformly dispersed structure of carbide with an average particle diameter of 0.1 to 1.2 mum; and is subjected to punch and subsequent heat treatment for the main body to have a tensile strength of 1307 to 1633 MPa, hardness of 400 to 500 HV, impact value of 70 J/cm2 or more, and degree of flatness of 0.15% or less which is obtained by a formula of F=d/D where d is camber of the flat portion and D is a diameter of a circumscribed circle of the main body.
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