Patent ID: 6045633
Filing Date: 2000-04-04
Classification: B29C,C21D

Abstract:
A process of manufacturing a mold base for plastic injection molds, said process comprising the steps of:heat treating a steel alloy comprising about 1.0%-1.6% by weight Mn, about 0.01%-0.03% by weight P, about 0.25%-1.0% by weight Si, about 0.5%-1.3% by weight Cu, about 0.01%-0.1% by weight V, about 0.02%-0.08% by weight N, about 0.03%-0.06% by weight C, about 12.0%-14.0% by weight Cr, about 0.06%-0.3% by weight S and the balance being Fe with residual impurities, at a temperature not lower than 2150.degree. F.;hot working said steel alloy within the temperature range of about 1700-2150.degree. F.;cooling said steel alloy by free air cooling to room temperature; andforming a mold base from said alloy for use in plastic injection molding.