Desulfurization, creeping and inoculation integrated vermicular graphite cast iron modifier and preparation process

Abstract

The invention relates to a desulfurization, vermicularization and inoculation integrated vermicular graphite cast iron modifier and a preparation process. In terms of weight percentage, the main composition of the modifier is 6-10% of limestone powder, 76-80% of rare earth magnesium alloy particles, 13-16% of scaly high-purity graphite powder, and the rest is binder. The modifier uses limestone powder as desulfurizer, rare earth magnesium alloy as vermicular agent, flake high-purity graphite powder as deceleration and inoculant, and water glass as binder. After alloy crushing, primary mixing and secondary mixing , Natural curing and drying process. The modifier can complete the desulfurization, vermicularization and inoculation operations of vermicular cast iron production at one time, and can stably obtain vermicular graphite cast iron with a vermicularization rate of more than 85%.

Description

technical field [0001] The invention relates to the technical field of vermicular graphite cast iron production, in particular to a desulfurization, vermicularization and inoculation integrated vermicular graphite cast iron modifier and a preparation process. Background technique [0002] The excellent thermal shock fatigue resistance of vermicular graphite cast iron depends on the graphite form in the matrix - vermicular graphite. The graphite form of vermicular cast iron is between the flake graphite of gray cast iron and the spherical graphite of nodular cast iron. Its vermicularization treatment process range is very narrow, and the vermicularization treatment technology is difficult. If the creep treatment is excessive, it will become ductile iron, and if the creep is insufficient, it will become gray cast iron. Vermicular graphite cast iron has high requirements for inoculants, and it is easy to cause poor inoculation and recession. Therefore, the performance of verm...

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Problems solved by technology

[0004] (1) Regardless of the type of vermicular agent and inoculant, in the production of vermicular graphite cast iron, vermicularization and inoculation treatment must be performed separately, the operation is cumbersome and time-consuming, and the quality is not easy to control;

[0005] (2) The addition amount of vermicular agent is narrow and sensitive to the sulfur content of molten iron. When the sulfur content is high or fluctuates greatly, the addition amount is difficult to control, which will cause vermicularization failure and fail to form a stable production process;

[0006] (3) The effective inoculation time of the inoculant is short, and it is easy to cause inoculation decline, resulting in a decrease in the quality of the casting or scrapping

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