Spheroidizing method

Abstract

Provided is a nodularization-processing method for producing nodular cast iron. The method comprises: pouring a melted rare earth ferrosiliconmagnesium nodularizer alloy liquid containing Mg <=20%, Si<=65%, and RE<=3% into a square steel tube for solidification and cooling; fixing the whole rare earth ferrosiliconmagnesium nodularizer lined on the outside with the square steel tube into a nodularization ladle using the inner and bottom masonry refractory bricks and wedge chocks in the nodularization ladle covered with a ladle cover, nodularization-processing through a pour-over ladle method; controlling the time for the nodularization reaction accurately, the temperature reduction of the molten iron being small during the nodularization-processing and pouring, the absorption rates of Mg, RE and Si becoming high after the nodularization-processing; 15 minutes after the completion of the nodularization reaction no decline in spheroidization occurs, thus improving the production environment during the manufacturing of a nodularizer and use thereof and significantly reducing production costs and increasing the quality of the product. Compared with a traditional rare earth ferrosiliconmagnesium nodularizer containing RE at a content of 2-8%, the nodularization-processing by the above method realizes the reduction of the usage amount of RE by 50-75%.

Description

technical field [0001] The present invention relates to the spheroidizing treatment method for the production of nodular cast iron, more specifically to the spheroidizing treatment by using the massive rare earth magnesium ferrosilicon spheroidizing agent lined with square steel pipes in the spheroidizing bag and carrying out the method of rushing into the bag. Methods. Background technique [0002] Rare earth magnesium ferrosilicon alloys are widely used as nodularizers in enterprises producing ductile iron castings. Rare earth magnesium ferrosilicon alloy nodulizer is currently the largest nodulizer at home and abroad, but in its traditional production process, it consumes a lot of energy, has large melting loss, and causes serious environmental pollution. Due to the low absorption rate of magnesium, the traditional nodulizer The amount added is larger. For a long time, technical personnel at home and abroad have made unremitting efforts to study the spheroidization trea...

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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