Patent ID: 6527878
Filing Date: 2003-03-04
Classification: B22D,C21D,C22C

Abstract:
A thermally treated Fe-based cast product which is produced by thermally treating an Fe-based cast product made by utilizing a thixocasting process using a Fe-based hypoeutectic casting material as a casting material, said thermally treated Fe-based cast product including a matrix and a large number of massive groups of fine &agr;-grains dispersed in the matrix, said thermally treated Fe-based cast product having a thermally-treated texture where a large number of graphite phases are dispersed in said matrix and in each of said groups of fine &agr;-grains, and said thermally treated Fe-based cast product having a free-cutting property such that a ratio B/A of an area rate B of the graphite phases in all said groups of fine &agr;-grains to an area rate A of the graphite phases in the entire thermally-treated texture is in a range of B/A&gE;0.138.