Preparing method and application of gray iron inoculant

Abstract

The invention discloses a preparing method of gray iron inoculant. The preparing method comprises the following steps that 66-70% of Si, 1-3% of Zr, 1-2% of Ca, 0-2.5% of Mn, 0.5-1.5% of Fe3O4, 0.5-1% of carburant and the balance Fe and inevitable microelements are evenly mixed, smashed, melted, stirred, poured, quickly frozen and smashed for standby use. The invention further discloses application of the gray iron inoculant. By means of the gray iron inoculant, the comprehensive performance of gray iron can be improved, and the inoculating efficiency is improved.

Description

technical field [0001] The invention relates to the field of casting, in particular to a preparation method of a gray cast iron inoculant and its application in the field of casting. 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] Gray cast iron is basically a eutectic alloy composed of iron, carbon and silicon, in which carbon mainly exists in the form of graphite. Gray cast iron is one of the most widely used cast iron materials in the field of cast iron. Because of its good castability, good wear resistance, good machinability, smooth surface, high vibra...

AI Technical Summary

Problems solved by technology

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

[0005] In order to improve the above shortcomings, some manufacturers began to add other materials to the ferrosilicon inoculant to prepare composite inoculants, such as chromium, copper, etc. However, when adding the above materials, new problems will be introduced

For example, the addition of chromium will increase the probability of white structure formation, which will lead to a decrease in the hardness of gray iron. Adding copper will not only have no good effect in improving the properties of gray iron, but will greatly increase the cost of preparing inoculants.