Desulfurization/vermiculization/inoculation-integrated vermicular cast iron modifier and preparation technique thereof

Abstract

The invention relates to a desulfurization / vermiculization / inoculation-integrated vermicular cast iron modifier and a preparation technique thereof. The modifier is mainly composed of the following components in percentage by weight: 6-10% of limestone flour, 76-80% of rare-earth magnesium alloy particle, 13-16% of flake high-purity graphite powder and the balance of adhesive. The preparation technique comprises the following steps: by using the limestone flour as the desulfurizer, the rare-earth magnesium alloy as the vermiculizer, the flake high-purity graphite powder as the retarder and inoculator and the water glass as the adhesive, crushing the alloy, carrying out primary mixing and secondary mixing, naturally setting, and drying. The modifier can complete the desulfurization, vermiculization and inoculation operations in one vermicular cast iron production process, and can stably obtain the vermicular cast iron with the vermicular ratio of higher than 85%.

Description

technical field [0001] The invention relates to the technical field of vermicular graphite cast iron production, in particular to a desulphurization, creeping and inoculation integrated vermicular graphite iron modifier and a preparation process. Background technique [0002] The excellent thermal shock fatigue performance of vermicular graphite cast iron depends on the form of graphite in the matrix - vermicular graphite. The graphite form of vermicular graphite cast iron is between the flake graphite of gray cast iron and the spheroidal graphite of ductile iron. If the creeping treatment is over, it will become ductile iron, and if the creeping is insufficient, it will become gray cast iron. Compacted graphite cast iron requires high inoculants, and is prone to poor inoculation and recession. Therefore, the performance of creep modifier largely determines the technical level of vermicular graphite cast iron production. [0003] At present, there are four series of rare ...

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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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