To obtain a material exhibiting excellent wear resistance even in a high temp. corrosive environment by incorporating cast iron with respectively specified amounts of C, Si, Mn, Cr and Co or Ni and moreover adding it with Al, V, Nb, Ta, Mo, Ti or the like.
The compsn. of a cast iron material is composed of, by weight, 0.8 to 4.0% C, ≤2.0% Si, ≤2.0% Mn, 10 to 30% Cr and 15 to 50% Co or Ni, and the balance Fe with inevitable impurities. If required, at least one or more kinds among Al, V, Nb, Ta, Mo and Ti are moreover incorporated therein. In this material, for improving its wear resistance, hard crystallized carbides are utilized. The carbides take the form of M7C3, M23C6 type carbides similar to that of a high Cr cast iron material. In the base structure, for improving its heat resistance and corrosion resistance, Fe is substituted for Co or Ni, and moreover, fine carbicies are dispersedly crystallized out.
HIRATA KOJI
MATSUBARA YASUHIRO
SASAKURI SHINYA
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