Processing process of gray iron production

Abstract

The invention provides a processing craft of gray iron production. The invention aims at providing a processing process of gray iron production, and the processing process is simple in process and is convenient to process. According to the key points of the technical scheme adopted by the invention, the processing process of gray iron production comprises the following steps: (1) smelting ductile cast iron foundry returns, gray iron foundry returns, steel scrap and furnace burden of a carburant in a medium-frequency induction furnace, and stewing at 1550 DEG C for 5-10 minutes; (2) adding a silicon-barium inoculant accounting for 0.2-0.4% of the total weight of discharged iron to perform inoculation modification on discharged molten iron when discharging the molten iron; and (3) in a pouring process, adding 0.05-0.2% of silicon-barium inoculants into the pouring molten iron in a flow following manner to perform flow following inoculation on the pouring molten iron, thereby finishing processing. By adopting the processing process provided by the invention, on the premise of not affecting the metallographic structure or the mechanical property of the gray iron, in a process of producing gray iron casting, the ductile cast iron foundry returns are added to improve the utilization rate of the ductile cast iron foundry returns and reduce the processing cost of the gray iron.

Description

Technical field: [0001] The invention relates to the processing of gray iron, in particular to a processing technology for gray iron production. Background technique: [0002] In contemporary society, with the development of industry, a large amount of gray iron is used. Now the general processing technology is to use gray iron regrind for gray iron production, and nodular iron regrind for nodular iron production. Especially in the field of automobile brakes, due to the structural characteristics of the caliper body and bracket-type ductile iron castings, the process yield is low, and the ductile iron recycled materials cannot be fully utilized, which leads to long-term and large-scale production of ductile iron recycled materials. There is a large backlog of nodular iron refractory materials. If the excess nodular iron refractory materials are sold at a low price, it will not only cause waste of cost, but also increase the cost of purchased raw materials such as pig...

AI Technical Summary

Problems solved by technology

Especially in the field of automobile brakes, due to the structural characteristics of the caliper body and bracket-type ductile iron castings, the process yield is low, and the ductile iron recycled materials cannot be fully utilized, which leads to long-term and large-scale production of ductile iron recycled materials. There is a large backlog of ductile iron recycled materials. If the excess ductile iron recycled materials are sold at a low price, it will not only cause waste of cost, but also increase the cost of purchased raw materials such as pig iron and scrap steel. Therefore, how to turn nodular iron recycled materials into treasures has become a technical problem.