Spheroidal graphite cast iron production method and spheroidal graphite cast iron prepared by method

Abstract

The invention discloses a spheroidal graphite cast iron production method and spheroidal graphite cast iron prepared by the method, which relate to the field of a metallurgical industry. The production method disclosed by the invention comprises the steps of adding a nucleating agent when covering a spheroidizing agent, adding a nucleating agent before discharging molten iron for the second time after spheroidizing reaction is finished, adding a nucleating agent after discharging all molten iron and slagging-off, and adding a nucleating agent during pouring, so that molten iron is still at aneffective nucleating state during a whole pouring process, qualified spheroidal graphite form and quantity can be obtained, and the quality of the produced spheroidal graphite cast iron is ensured.

Description

【Technical field】 [0001] The invention relates to the field of metallurgical industry, in particular to a production method of nodular cast iron and the nodular cast iron prepared therefrom. 【Background technique】 [0002] Ductile iron is a material that not only maintains the advantages of gray cast iron but also has the flexibility and strength of steel. It solves the problems that gray iron and steel cannot solve, and is widely used in machinery industry and other industries. The production of ductile iron has very high technical requirements. It has been proved by experiments that if good and sufficient nodular graphite cannot be produced in the produced nodular cast iron, its performance is not as good as that of low-grade gray cast iron, and it cannot be used in the industrial field. . Therefore, the first key to producing high-quality ductile iron is to obtain good and sufficient nodular graphite. [0003] In the ductile iron production process of the prior art, exc...

AI Technical Summary

Problems solved by technology

In the existing technology, when producing high-strength and high-hardness ductile iron, Cu, Mo, Ni, V, Ti, Cr and other elements are usually added to improve the strength and hardness of ductile iron, which has become the first choice for many foundry companies However, while this solution increases the tensile strength and material hardness of the ductile iron, it will also lead to the deterioration of the machining performance of the ductile iron, the prolongation of the machining time, and the sharpening and cutting of knives that often occur during the machining process. Phenomenon

In addition, metals such as Mo, Ni, V, etc. are expensive, resulting in high production costs for castings