C - Chemistry – Metallurgy – 21 – C
Patent
C - Chemistry, Metallurgy
21
C
22/108, 22/188,
C21C 1/10 (2006.01) B22D 2/00 (2006.01) C21C 1/08 (2006.01)
Patent
CA 1080480
ABSTRACT OF THE DISCLOSURE A method and apparatus is disclosed for conditioning a charge of molten cast iron, which would normally solidify with a flake graphite structure, to produce partial or total spheroidal graphite cast iron. In addition, the method and apparatus can be used to further condition a partially conditioned cast iron to yield a partial or fully spheroidal graphite cast iron. A recess is provided in the metal flow system (within or without the mold system) leading to the casting cavity or cavities. The recess has a shape and cross- section cavity or cavities. The recess has a shape and cross- section (taken in directions normal to the direction of flow of the molten charge) such that the spheroidizing agent dissolves uniformly when the molten iron flows over it to achieve unprecedented homogeneity. A relationship is disclosed between charge weight, charge flow rate, magnesium concentration in the spheroidizing alloy, and interface area so as to determine a desired degree of nodularity in the final casting and/or to design a solution rate compatible with a specific casting technique. The residual magnesium can be reliably maintained at a level sufficient to consistently obtain full spheroidal graphite shape. A preferred magnesium level is 0.20% to 0.040% by weight of the weight of the casting but higher or lower levels can be reliably obtained if required by base metal chemistry. This is significant since the prior art has been unable to reliably obtain full nodularity with 0.020 to 0.025% by weight residual magnesium under commercial conditions.
254137
Hetke Adolf
Mohla Prem P.
Warrick Robert J.
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