Spheroidizing method

Abstract

The invention relates to a spheroidizing method for producing spheroidal graphite cast iron, and the method comprises the following steps: injecting rare earth magnesium silicon iron inoculant alloy fluid containing less than or equal to 20% of Mg, less than or equal to 65% of Si and less than or equal to 3% of RE into a square steel pipe for solidifying and cooling; fixing the whole rare earth magnesium silicon iron inoculant of the outer lining square steel pipe in a spheroidizing bag by using refractory bricks and wedge-type chocks at the bottom of the spheroidizing bag covered, and then carrying out spheroidizing by utilizing a bag injecting method. The time for controlling spheroidizing is accurate, the molten iron cooling is less in the spheroidizing and casting process, the absorption rate of Mg, RE and Si after the spheroidizing is high, degradated spheroidization is avoided 15min after spheroidizing, the environment for producing and using a spheroidizing agent is improved, the production cost is remarkably reduced and the quality of the product is improved. Compared with the traditional magnesium silicon iron spheroidizing agent with the rare-earth element RE content of 2-8%, the spheroidizing method can be used for reducing the use amount of the rare-earth element RE by 50-75%.

Description

Technical field [0001] The invention relates to a spheroidizing method for producing nodular cast iron, more specifically, it is a spheroidizing process of a spheroidizing ladle that uses a block rare earth magnesium ferrosilicon spheroidizing agent lined with a square steel pipe to be carried out in a ladle. Methods. Background technique [0002] Rare earth magnesium ferrosilicon alloy is widely used as nodularizing agent in enterprises producing ductile iron parts. Rare earth magnesium ferrosilicon alloy spheroidizing agent is currently the largest amount of spheroidizing agent used at home and abroad, but in its traditional production process, energy consumption is high, melting loss is large, and environmental pollution is serious. Traditional spheroidizing agent has low magnesium absorption rate. Larger addition amount. For a long time, technical personnel at home and abroad have made unremitting efforts to study the spheroidizing process technology of the spheroidizing me...

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a kind of spheroidizing treatment method, utilize the integral rare earth magnesium ferrosilicon nodulizing agent of outer liner square steel pipe to cooperate with the spheroidizing treatment bag that covers cover, solve violent reaction, The problem of low absorption rate of effective elements, precise control of spheroidizing reaction time, improving product quality, reducing production costs, fully exerting and utilizing resources, and significantly improving the production environment of the spheroidizing agent production process and use process

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