Improvements in or relating to the Production of Spheroidal Graphite Irons.

摘要

1,183,691. Making S.G. iron. STEEL CASTINGS RESEARCH & TRADE ASSOCIATION. Jan.23, 1969 [Feb.2, 1968], No.5408/68. Heading C7D. In the production of S. G. iron a bath which may have been produced e. g. in a cupola or electric furnace wholly or partly from iron or steel scrap, is first subjected to an oxidation boil to eliminate impurities; it is then deoxidized, and powdered graphite injected in a carrier gas such as nitrogen argon or air while the bath is maintained under reducing conditions, after which a spheroidizing addition such as nickel-magnesium, iron-silicon-magnesium, cerium or magnesium is made. The oxidation boil may be effected by oxygen lancing, by an oxy-fuel burner, or by the addition of the oxide of a metal such as iron, nickel or chromium which is desired in the product.