COMPOSITION FOR INOCULATING LOW SULPHUR GREY IRON

摘要

A composition for inoculating grey iron, particularly low sulphur grey iron, comprises by weight: rare earth 1.0 - 4.0 %, preferably 1.5 - 2.5 %; strontium 0.5 - 1.5 %, preferably 0.7 - 1.0 %; calcium 1.5 % maximum, preferably 0.5 % maximum; aluminium 2.0 % maximum, preferably 0.5 % maximum; silicon 40.0 - 80.0 %, preferably 70.0 - 75.0 %; iron balance. The composition is most preferably free of calcium and aluminium. The rare earth may be cerium, mischmetall or a mixture of cerium and other rare earths. The composition may be a mixture of ferrosilicon and the other constituents, a ferrosilicon alloy containing the other constituents or a rare earth and a silicon-bearing inoculant containing strontium.