A smelting method for producing ductile iron castings from scrap steel

A technology for iron castings and scrap steel, applied in the field of iron and steel casting, can solve the problems of large undercooling of molten iron, high hardness of castings, poor inking ability, etc., and achieve the effects of improving elongation, good quality and low cost
CN107083515BActive Publication Date: 2019-01-29SICHUAN CHUANJIAN PIPES
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SICHUAN CHUANJIAN PIPES
Publication Date
2019-01-29

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Abstract

The invention relates to the steel casting industry and particularly relates to a melting method for producing a nodular iron casting with waste steel. The melting method comprises processes of waste steel melting and spheroidizing; the waste steel melting process comprises the steps that plain carbon steel and a carburant are added into the furnace bottom, large-power high-temperature melting is performed, the plain carbon steel and the carburant are added while melting is performed, a crushing material and a briquetting material of automobile steel sheets are added in the later period of melting, deslagging is performed, a nucleating agent is added for melting after the recarburization process is completed, samples are taken and analyzed, the contents of C and Si are adjusted, and tapping is performed; and the spheroidizing process comprises the step that molten iron is subjected to magnesium spraying and spheroidizing. The melting method has the following advantages that the cost is low, quality is good, and less waste products are produced.
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Description

technical field

[0001] The invention relates to the technical field of iron and steel casting, in particular to a smelting method for producing ductile iron castings from scrap steel. Background technique

[0002] At present, the foundry industry is facing the reality that the price of furnace materials is rising rapidly, especially the price of pig iron. As the price of steel continues to rise, the price of cast iron is also getting higher and higher. The high price of pig iron and the uneven quality not only increase the production cost of ductile iron pipes, but also greatly affect the quality. Therefore, it is imperative to explore new production processes to improve product quality and reduce production costs.

[0003] Traditionally, when electric furnace is used to smelt scrap steel and add recarburizer to produce ductile iron, the product quality obtained is unstable, mainly due to the few spontaneous crystal nuclei during solidification and crystallization of molten...

Claims

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