Nodulizing method

Abstract

The invention relates to a nodulizing method for producing nodular cast iron, which comprises the following steps: injecting a fused rare-earth (RE) magnesium silicon iron nodulizer alloy liquid, which contains at most 20% of Mg, at most 65% of Si and at most 3% of RE, into a rectangular steel tube, solidifying, and cooling; and fixing the integral RE magnesium silicon iron nodulizer of the outer lining rectangular steel tube into the nodulizing ladle by using refractory bricks and wedged blocks on the bottom in the cladded nodulizing ladle, and nodulizing by a ladle-in process. The nodulizing reaction time is controlled precisely, the temperature drop in the nodulizing process and casting process is low, the absorptivity of Mg, RE and Si after nodulization is high, and no degraded nodulization appears within 15 minutes after the nodulizing reaction finishes, thereby improving the production environment in the nodulizer manufacturing process and use process, obviously lowering the production cost and improving the product quality. Compared with the traditional rare-earth magnesium silicon iron nodulizer with the RE content of 2-8%, the nodulizing technique provided by the invention lowers the consumption of the RE by 50-75%.

Description

Technical field [0001] The invention relates to a spheroidizing method for producing nodular cast iron, and more specifically, it is a spheroidizing method that uses a block of rare earth magnesium ferrosilicon spheroidizing agent lined with rectangular or square steel pipes in a spheroidizing ladle. Processing method. 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 m...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a spheroidizing treatment method, which utilizes the integral rare earth magnesium ferrosilicon spheroidizing agent lined with rectangular or square steel pipes to cooperate with the spheroidizing treatment bag covering the cover to solve the problem of reaction during spheroidizing treatment by rushing into the bag. To solve the problem of severe and low absorption rate of effective elements, precisely control the spheroidization reaction time, improve product quality, reduce production costs, give full play to and utilize resources, and significantly improve the production environment of the nodulizer production process and use process

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