Casting method of large-tonnage nodular iron casting

By using pig iron and low carbon steel for ductile iron of a specific proportion in the casting process of large-tonnage ductile iron, combined with spheroidization package design and step-by-step spheroidization method, the addition of spheroidizing agents and inoculant is accurately controlled, and the use of silicon zirconium manganese inoculant is incubated with the flow, the problem of poor spheroidization effect in traditional casting methods is solved, and the mechanical properties and comprehensive quality of ductile iron parts are significantly improved.

CN119710122APending Publication Date: 2025-03-28SICHUAN JIANYANG HAITE
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Patent Information

Application Number
CN202411972317.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-30
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

During the casting process of large-tonnage ductile iron parts, the traditional iron production process causes the spheroidizer to fail to fully contact with the molten iron under ideal conditions, resulting in a reduced spheroidization effect, which in turn weakens the mechanical properties and comprehensive quality of the casting.

Method used

A large tonnage ductile iron casting is used to obtain raw iron by melting pig iron and low carbon steel in a specific proportion of ductile casting iron, and ribs are set in the spheroidized bag, and the bottom space is divided into two grooves, and spheroidized agent and Sb are placed respectively. The particle size and addition amount of spheroidizing agent and barium silicon inoculant are accurately controlled, combining step-by-step spheroidization method and flow-based incubation technology of adding silicon zirconium manganese inoculant during pouring.

Benefits of technology

Through this method, the spheroidizing agent can be dispersed more evenly, the spheroidizing reaction is more stable and sufficient, the spheroidization effect and spheroidization rate are improved, the mechanical properties and comprehensive quality of ductile iron parts are improved, and the drawbacks of traditional processes are overcome.

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Abstract

The invention relates to the field of casting, and particularly discloses a casting method of a large-tonnage nodular iron casting. The invention discloses a casting method of a large-tonnage nodular iron casting. The casting method comprises the following steps: smelting 80-90% of pig iron for nodular cast iron and 10-20% of low-carbon steel to obtain base iron; molten iron accounting for 1 / 3 of the total mass of the base molten iron is transferred into a ladle, then fed materials are added into the base molten iron according to the initial proportion to fill up 1 / 3 of the base molten iron, and the base molten iron is transferred into the ladle after being heated and melted; a spheroidizing agent is added into a spheroidizing bag, the surface of the spheroidizing agent is covered with a silicon-barium nucleating agent, the surface of the silicon-barium nucleating agent is covered with a silicon steel sheet, and Sb is placed on the other side in the spheroidizing bag; 3 / 4 of the molten iron in the molten iron ladle is transferred into a spheroidizing ladle for spheroidizing reaction, and the remaining molten iron is transferred after the reaction in the spheroidizing ladle is stable; and the molten iron is poured into a forming cavity of a casting mold, a silicon-zirconium-manganese nucleating agent is added, and the nodular iron casting is obtained. The casting method of the large-tonnage nodular iron casting has the advantage that the mechanical property of the casting is improved.
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