Preparation method of gray cast iron

The invention provides a preparation method of gray cast iron. The preparation method comprises the following steps that (1) waste steel, raw iron and foundry returns are sequentially added into a medium-frequency induction electric furnace for smelting according to a proportion, preheating treatmen...

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Bibliographische Detailangaben
Hauptverfasser: LAI DEBIN, ZHU NENGYI, ZHOU YUFENG, HE SHENGJIAN, LIN YONGCHUAN, HUANG JIANYOU
Format: Patent
Sprache:chi ; eng
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Beschreibung
Zusammenfassung:The invention provides a preparation method of gray cast iron. The preparation method comprises the following steps that (1) waste steel, raw iron and foundry returns are sequentially added into a medium-frequency induction electric furnace for smelting according to a proportion, preheating treatment is carried out on a casting ladle when the temperature of molten iron reaches 1300 DEG C, and thennon-graphite fossil tar carburant is added into the furnace; (2) a manganese-chromium-vanadium nitride is added into the furnace when the molten iron reaches a certain temperature; (3) when the amount of the iron liquid in the casting ladle accounts for the quarter of the tapping amount, a first inoculation treatment is carried out, and is finished until the amount of the iron liquid in the casting ladle is third of the tapping amount; and (4) second inoculation adopts an inoculation mode in a pouring system, a nucleating agent is placed in a reaction tank, the iron liquid flow is subjected to secondary inoculation t