High-strength steel continuous galvanizing production method capable of avoiding plating leakage of plating

Abstract

The invention discloses a high-strength steel continuous galvanizing production method capable of avoiding plating leakage of plating. The high-strength steel continuous galvanizing production methodincludes the steps that the oxygen content, the hydrogen content and the annealing temperature in a continuous annealing furnace are controlled; the oxygen content of a heating section in the continuous annealing furnace is controlled at 200-400 ppm; the hydrogen content in the continuous annealing furnace is controlled, and the H2 content in a soaking section and the H2 content in a cooling section are both greater than or equal to 4.0%. According to the high-strength steel continuous galvanizing production method capable of preventing plating leakage of the plating, the oxygen content of theheating section in the furnace is improved, meanwhile, the hydrogen content of each subsequent section of the heating section is guaranteed, thus strip steel is fully oxidized in the heating section,elements such as manganese and silicon in high-strength steel are prevented from being oxidized into unreducible silicon-manganese oxides under the condition that the oxygen content is very low, under the action of the high temperature in the soaking section and the cooling section of the annealing furnace, the oxidized surface of the strip steel is reduced to the pure iron surface due to the action of hydrogen, enrichment points of silicon-manganese oxidation are avoided, and the condition that the silicon manganese oxides affect organic combination of the plating and the strip steel to formplating leakage points is avoided; and no more investment is required, and economic feasibility is achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a continuous galvanizing production method of high-strength steel that prevents missing coating of coating layers. Background technique [0002] The rapid development of the automobile manufacturing industry has made automobiles the main means of transportation for people. As the safety requirements of automobiles are getting higher and higher, the proportion of high-strength steel in automobile steel is getting higher and higher. In order to ensure the corrosion resistance of automobile steel, the proportion of high-strength steel for galvanizing in automobile steel is increasing rapidly. promote. [0003] High-strength steel for automobiles is mainly to add alloy elements such as silicon and manganese to the steel to improve the strength of the steel. However, due to the excessive addition of silicomanganese elements, the surface of the high-strength steel will...

AI Technical Summary

Problems solved by technology

At the same time, it will prevent the aluminum in the plating solution from reacting with the surface of the strip steel to form an adhesion layer, thereby forming missing plating

This will affect the corrosion resistance of subsequent automotive components