| 摘要 |
<p>Improved cast iron is produced by forming a furnace charge containing 10-100% by weight of a nodular pig iron having no primary kish graphite and produced by treatment at a blast furnace with a first nodularizing agent, melting the charge and forming a casting which has flaky graphite or, if a second nodularizing agent is added to the molten charge, nodular graphite. The first and second nodularizing agents may be the same and may comprise Ca, Mg, Ce, Li, misch metal, or one or more rare earth metal fluorides mixed with a reducing agent, preferably calcium silicide; e.g. 1 1/2 % magnesium ferrosilicon containing 9.5% Mg and 40% Si may be added. Nodularizing metals may be added by sub-surface injection with inert gas. The raw pig iron may be first melted in a cupola or electric furnace.</p> |
