Nanometer reinforced high-strength low-carbon Nb-contained steel for hot galvanization and preparation method thereof

Abstract

The invention relates to nanometer reinforced high-strength low-carbon Nb-contained steel for hot galvanization. The steel comprises the following components in percentage by mass: 0.10-0.30 wt% of Nb, 0.10-0.35 wt% of Mo, 0.01-0.05 wt% of C, 0.05-1.2 wt% of Mn, 0.015-0.26 wt% of Si, 0.005-0.025 wt% of P, 0.003-0.020 wt% of S, 0.001-0.015% wt% of Al, 0.001-0.015 wt% of N, and the balance of Fe and inevitable impurities. Meanwhile, the invention further comprises a preparation method of the nanometer reinforced high-strength low-carbon Nb-contained steel for hot galvanization. As the contents of Nb and Mo in the steel are controlled, under the precondition of reducing microalloy elements in the steel, the strength of a steel plate is improved through a precipitation strengthening effect of nanoparticles, the production cost is reduced, the wettability of the surface of the steel plate and zinc liquid is improved, the uniformity of a plated layer is improved, the plating missing rate is reduced, and the platability of the steel plate and the surface quality of the plated layer are improved; and the preparation method has the advantages of low production cost, uniform thickness of a hot-galvanized layer, high surface quality and high adhesion of the plated layer.

Description

technical field [0001] The application relates to the technical field of hot-dip galvanized high-strength iron and steel materials, in particular to a nano-strengthened high-strength low-carbon Nb-containing steel for hot-dip galvanizing and a preparation method thereof. By adding a certain amount of Nb and a small amount of Mo to the steel, a single-phase ferrite structure is obtained, the formability of the steel plate is improved, and at the same time, a large precipitation strengthening effect is obtained, the size of the precipitates is refined, and the nanometer in the steel is realized. The second phase of the particles is precipitated and strengthened, thus obtaining a high-strength steel plate. Background technique [0002] With the global energy shortage and the aggravation of the global warming effect, the automobile industry for the purpose of energy saving and environmental protection gradually tends to be lightweight, and steel sheets for automobiles begin to d...

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Problems solved by technology

[0006] In view of the above-mentioned analysis, the present application aims to provide a nano-reinforced high-strength low-carbon Nb-containing steel for hot-dip galvanizing and its preparation method, in order to solve the problem that the prior art relies on increasing the addition of alloy elements to improve the strength and The price of scarce elements is soaring and the resources are in a hurry due to the performance

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