| 摘要 |
A road wheel composition having high surface hardness and high strength, which is manufactured by a heat treatment of a metal powder containing Fe as a main component, C, Si, Mn, P, S, Al, Ti, N, Cr, and B, and a method for manufacturing a road wheel for an automobile having high surface hardness and high strength by quenching an end of a formed road wheel rim by means of high-frequency heater and cooler using the road wheel composition. Road wheel composition includes Fe as a main component, C of 0.10 to 0.40 wt %, Si of 0.15 to 0.35 wt %, Mn of 0.35 to 2.0 wt %, P of not exceeding 0.03 wt %, S of not exceeding 0.3 wt %, Al of 0.05 to 0.15 wt %, Ti of 0.005 to 0.03 wt %, Nb of 0.025 to 0.045 wt %, Cr of not exceeding 0.35 wt %, and B of not exceeding 0.005 wt %. Road wheel having excellent surface hardness and high strength is manufactured.
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