Method for processing molten cast iron

Abstract

A method for processing molten cast iron uses an inoculant that includes: 15-80 wt% of Si; as a rare earth element, either La of 80-100 wt% purity or Ce of 80-100 wt% purity; Ca; and Al; the remainderconsisting of Fe and unavoidable impurities. The method includes a molten cast iron inoculation process, in which the inoculant is added to molten cast iron such that the amounts of the constituent elements added in relation to the molten cast iron are 0.001-0.009 wt% La or Ce, 0.001-0.02 wt% Ca, and 0.001-0.02 wt% Al.

Description

technical field [0001] The present invention relates to a molten metal treatment method for cast iron, including both spheroidal graphite cast iron and flake graphite cast iron. The molten metal treatment method includes: inoculation treatment which is especially effective for improving the mechanical properties of thick-walled cast iron (spherical graphite cast iron, flake graphite cast iron). Background technique [0002] In the casting of spheroidal graphite cast iron and flake graphite cast iron, it is usually carried out by inoculating the molten metal when it is released from the furnace to the ladle, and when it is poured from the ladle to the mold, so as to improve Mechanical properties (tensile strength, elongation) of cast iron products. [0003] In thick-walled cast iron products, because the eutectic solidification time that causes graphite crystallization becomes longer, abnormal graphite or coarse graphite in the metal structure is easy to crystallize. The cr...

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Problems solved by technology

[0006] As mentioned above, the eutectic solidification time becomes longer when casting thick-walled cast iron products

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