Cast iron especially suited for ingot molds
AssigneeSandvik Aktiebolag
InventorsMelih Yaman, Kjell Gustavsson, Orjan Hammer
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Abstract
This is provided an ingot mold formed of a cast iron consisting essentially of 3.7 to 4.0% C, not more than 1.6% Si, 0.40 to 0.80% Mn, 0.10 to 0.45% P, not more than 0.10% S, 0.020 to 0.050% Mg, the balance Fe with normally appearing impurities. The elements are adjusted to provide a specific carbon equivalent in the range of 3.2 to 3.6% calculated as C.sub.eqv =%C+0.65% Si+0.35% P-35% Mg. In addition, the ingot mold structure of the present invention contains an amount of not more than 5% by volume of carbide, an amount of not more than 25% by volume of ferrite and at least two-thirds of the total graphite volume being spheroidal graphite with the balance pearlite.
Claims3
An ingot mold formed of a cast iron consisting essentially of 3.7 to 4.0% C, not more than 1.6% Si, 0.40 t 0.80% Mn, 0.010 to 0.045% P, not more than 0.010% S, 0.020 to 0.050% Mg, the balance Fe with normally appearing impurities, the said elements being adjusted to provide a specific carbon equivalent in the range 3.2 to 3.6% calculated as C.sub.eqv =% C+0.65% Si+0.35% P-35% Mg, the ingot mold structure containing an amount of not more than 5% of volume of carbide, an amount not more than 25% of volume of ferrite, at least 2/3 of total graphite volume of spheroidal graphite and the balance pearlite.
Dependencies are inferred from the claim text.