Preparation method and application of nucleating agent for nodular cast iron

Abstract

The invention discloses a preparation method of a nucleating agent for nodular cast iron. The method comprises the step that 66%-72% of Si, 3%-10% of Ba, 1%-2% of Ca, 0.8%-1.8% of Al, 1.5%-2% of Ce, 0-1% of S and the balance Fe and inevitable micro elements are mixed, smelted, stirred, cooled and smashed; and then a mixture is mixed with Fe3O4 power to be pressed into a block to be smashed again. The invention further discloses application of the nucleating agent for nodular cast iron. By the adoption of the nucleating agent for the nodular cast iron, the comprehensive performance of the nodular cast iron can be improved, and the nucleating efficiency is improved.

Description

technical field [0001] The invention relates to the field of cast iron, in particular to a preparation method of an inoculant for ductile iron and its application in the field of ductile iron. Background technique [0002] The inoculant can promote graphitization, reduce the tendency of white mouth, improve the shape and distribution of graphite, increase the number of eutectic groups, refine the matrix structure, round the ductile iron graphite, reduce or eliminate chilling, and prevent free cementite on the surface Formation, uniform structure, improved mechanical properties and other advantages, it has been widely used in the field of cast iron. [0003] Spheroidal graphite cast iron is obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially improves plasticity and toughness, thereby obtaining higher strength than carbon steel. Ductile iron is a high-strength cast iron material developed in...

AI Technical Summary

Problems solved by technology

[0004] At present, most manufacturers use 75 ferrosilicon inoculant as the inoculant to produce ductile iron, but these products have shortcomings such as short incubation time, poor wear resistance, low hardness, low tensile strength, uneven cross-section, and easy to produce white spots. The product is unstable and cannot meet the requirements of some machine castings that require high hardness

[0005] In order to improve the above deficiencies, some manufacturers began to add other materials to the ferrosilicon inoculant to prepare composite inoculants, such as chromium, rare earth, etc. However, when adding the above materials, new problems will be introduced, such as increasing the formation of white structure. probability, which in turn leads to a decrease in the hardness of ductile iron