Patent ID: 6872264
Filing Date: 2005-03-29
Classification: B60B,C21D

Abstract:
1. A method for manufacturing a road wheel comprising the steps of: forming a road wheel composition comprising iron as a main component, carbon of from 0.10 to 0.40 wt %, silicon of 0.15 to 0.35 wt %, manganese of 0.35 to 2.0 wt %, phosphorus of not exceeding 0.03 wt %, sulfur of not exceeding 0.3 wt %, aluminum of 0.05 to 0.15 wt %, titanium of 0.005 to 0.03 wt %, niobium of 0.025 to 0.045 wt %, chromium of not exceeding 0.35 wt %, and boron of not exceeding 0.005 wt % to manufacture a road wheel rim; and high-frequency heat treating an end of the manufactured road wheel rim by means of a high-frequency heater and a cooler wherein the high-frequency heater performs a heating operation with a high frequency and the cooler spraying cool water.