A vermicular agent for efficient vermicular graphite cast iron, its preparation and production method

Abstract

The invention belongs to the technical field of cast iron production particularly relates to a vermiculizer for high-efficiency vermicular graphite cast iron, and a preparation method and a productionmethod thereof, and solves problems that the use amount of rare earth RE in a vermiculizer in the prior art is large, the vermiculization rate in the vermicular iron production process is unstable, molten iron is easily subjected to large supercooling and the like. The vermiculizer is prepared from components, by weight, 8.0-15.0wt.% of Mg, 2.0-5.0wt.% of Ca, 1.0-2.0wt.% of Nb, 0.5-2.5wt.% of RE,40-50wt.% of Si and the balance of Fe and a small amount of impurities. By applying the vermiculizer to vermicular iron production, the morphology of the vermicular graphite can be obviously improved, generation of carbide is effectively controlled, moreover, the content of RE in a traditional vermiculizer is reduced, stable vermicular graphite can be obtained, and thereby the vermicular graphitecan be widely applied to vermicular iron piece production, and efficient and stable production of the vermicular cast iron is guaranteed.

Description

technical field [0001] The invention is applied to the production field of vermicular graphite cast iron materials, and specifically relates to a proportioning method of high-efficiency vermicular graphite cast iron and a production technology thereof. Background technique [0002] The graphite morphology of vermicular graphite cast iron is worm-like, between spherical and flake. Vermicular graphite cast iron has excellent overall performance, which is between gray cast iron and nodular cast iron. The tensile strength and fatigue strength of compacted graphite cast iron are doubled compared with gray cast iron, and the thermal conductivity is much higher than that of nodular cast iron, so it is a suitable material for advanced diesel engines and key components of heavy-duty vehicles. In order to obtain vermicular graphite cast iron, vermicularizing agents need to be added during the production process. The production process window of vermicular graphite cast iron is narro...

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Problems solved by technology

[0005] The present invention provides a high-efficiency vermicular agent for vermicular cast iron to solve the problem that the existing vermicular agent cannot realize the stable production of high-quality vermicular cast iron and has poor controllability, and at the same time solves the problem in the production process of vermicular graphite cast iron The creep rate is difficult to control, and the problem of carbide and waste of resources is easy to appear in the production process

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