Method for reinforcing anti-fatigue performance of wheel steel

Abstract

The invention provides a method for reinforcing anti-fatigue performance of wheel steel, and belongs to the technical field of steelmaking refining. The method comprises the steps of KR molten iron pre-treatment, converter smelting, LF refining, RH vacuum refining and continuous casting. In the RH vacuum refining procedure, the RH vacuum degree is controlled smaller than or equal to 100 Pa, and the vacuum treatment time is larger than or equal to 20 min. When the vacuum treatment time is larger than or equal to 15 minutes, rare earth alloy is added into the vacuum treatment molten steel; the mass percent of total oxygen in the vacuum treatment molten steel is smaller than or equal to 0.0015%, and the rare earth alloy is added in the vacuum state; through rare earth treatment, nonmetal inclusion in steel is subjected to denaturation into spherical rare earth sulfur oxide inclusion, the kind of inclusion is not gathered or grow in the smelting and casting processes, the non-metallic inclusion is controlled to small-size inclusion, in the rolling process, following with matrix deforming is avoided, inclusions in the final product are still small-size spherical non-metal inclusions, and the wheel steel fatigue life can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of steelmaking and refining, and in particular relates to a method for enhancing the anti-fatigue performance of wheel steel. Background technique [0002] Wheel steel is the steel used to produce car wheels. Wheel steel requires high strength, toughness and plasticity, high fatigue resistance, wear resistance and thermal crack resistance. At present, the anti-fatigue performance of wheel steel is low, which seriously affects the service life of the wheel steel. Therefore, it is urgent to find a method to enhance the fatigue resistance of the wheel steel in this field. [0003] At present, calcium wire feeding method and rare earth treatment method are generally used to enhance the fatigue resistance of wheel steel. The calcium wire feeding method has the following technical problems: (1) the absorption rate of calcium alloy is low, and the yield is only about 30%, (2) feeding The process of calcium wire n...

AI Technical Summary

Problems solved by technology

At present, the fatigue resistance of wheel steel is low, which seriously affects the service life of wheel steel. Therefore, it is urgent to find a method to enhance the fatigue resistance of wheel steel in this field.

[0003] At present, calcium wire feeding method and rare earth treatment method are generally used to enhance the fatigue resistance of wheel steel. The calcium wire feeding method has the following technical problems: (1) the absorption rate of calcium alloy is low, and the yield is only about 30%, (2) feeding The process of calcium wire needs to be stirred with the introduction of inert gas. Stirring will cause secondary oxidation of molten steel and reduce the purity of molten steel. (3) There are problems of large size and irregular shape of non-metallic inclusions in steel treated with calcium wire ; The rare earth treatment method has the problem that the floating time of inclusions after rare earth treatment is short, and the size of non-metallic inclusions in steel is large. Therefore, the existing calcium wire method and rare earth treatment method have adverse effects on enhancing the fatigue resistance of wheel steel

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