Technology for producing cast iron through full scrap steel

Abstract

The invention discloses a technology for producing cast iron through full scrap steel. The technology comprises the following steps of (1) raw material selection, wherein raw materials comprise 85% ofscrap steel and 15% of foundry returns, and the foundry returns are mainly casting head materials and industrial material waste; (2) smelting, wherein the raw materials are placed into a 2 t medium-frequency induction furnace for smelting, a crystal graphite carburant is added into the bottom of the electric furnace before smelting, after the raw materials smelt, silicon iron and manganese iron alloys are added, and furnace discharging is carried out when the temperature reaches 1480 DEG C to 1530 DEG C; (3) inoculation, wherein a ladle capable of containing 1000 kg of molten iron is selected, the molten iron is placed into the ladle, an inoculation agent is added, and the adding amount of the inoculation agent is 0.3% to 0.5%; and (4) casting, wherein a lost foam casting negative pressure absorbing model casting method is adopted, and pouring molding is carried out. According to the technology, the cast iron production cost is greatly reduced, and the casting quality is obviously improved.

Description

technical field [0001] The invention relates to a process for producing cast iron from all scrap steel, which is applied in the technical field of pig iron casting. Background technique [0002] With the gradual increase of the Chinese automobile market, there are more and more auto parts manufacturers producing various automobile (cast iron) gearbox cases, two-axis rear covers, clutch housings and other products on the market. The traditional cast iron process mainly uses scrap steel + pig iron + alloy method, in recent years, with the rising price of pig iron, the production cost of cast iron products is getting higher and higher. At the same time, because there are many thick hypereutectic graphite in new iron, it is difficult to be Eliminates and weakens the expansion effect of graphitization precipitation of molten iron during solidification, increases the shrinkage tendency of molten iron during solidification, and has a certain impact on the cutting performance of cas...

AI Technical Summary

Problems solved by technology

[0002] With the gradual increase of the Chinese automobile market, there are more and more auto parts manufacturers producing various automobile (cast iron) gearbox cases, two-axis rear covers, clutch housings and other products on the market. The traditional cast iron process mainly uses scrap steel + pig iron + alloy method, in recent years, with the rising price of pig iron, the production cost of cast iron products is getting higher and higher. At the same time, because there are many thick hypereutectic graphite in new iron, it is difficult to be Eliminates and weakens the expansion effect of graphitization precipitation of molten iron during solidification, increases the shrinkage tendency of molten iron during solidification, and has a certain impact on the cutting performance of cast iron products

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