Heat resistant cast iron - alloyed with (scrap) nickel-base alloy is used as car exhaust manifold

TLDR: In this article, cast iron is given improved heat resistance by adding to the liquid iron, before casting, 0.5-8% of a Ni-base high temp. alloy in the form of scrap, as well as Mo to give an Mo content of 0.25%.

Abstract: Cast iron is given improved heat resistance by adding to the liquid iron, before casting, 0.5-8% (1-2%) of a Ni-base high temp. alloy in the form of scrap, as well as Mo to give an Mo content of 0.25%. The alloy is also inoculated before casting using known agents, and the casting is heat treated at a temp. above the pearlite transformation, at about 800 degrees C before mechanical treatment.