Composite micro-alloying hot rolled steel plate containing V and Nb and preparation method thereof

Abstract

The invention belongs to the technical field of hot continuous rolled plate strips, in particular relates to a composite micro-alloying hot rolled steel plate containing V and Nb and a preparation method thereof, which can achieve the purpose of controlling the surface quality thereof. The composite micro-alloying hot rolled steel plate containing V and Nb, which is provided by the invention, notonly can reduce the generation of red scales but also can not increase the production cost. The composite micro-alloying hot rolled steel plate comprises the following chemical components in percentage by weight: C which is greater than or equal to 0.06% and is less than or equal to 0.08%, Si which is greater than 0.20% and is less than or equal to 0.30%, Mn which is greater than or equal to 0.70% and is less than or equal to 0.90%, V which is greater than 0.04% and is less than or equal to 0.05%, Nb which is greater than or equal to 0.02% and is less than or equal to 0.03%, P which is less than or equal to 0.025%, S which is less than or equal to 0.015%, and the balance iron and inevitable impurities. The preparation method provided by the invention has no need of reconstructing the existing equipment, has simple and controllable technological conditions, realizes the purpose of reducing the generation of scales by controlling the tapping temperature, the precision rolling temperature, the finishing temperature, the coiling temperature and the cooling mode of a plate blank, and has the advantages of low energy consumption and low cost.

Description

technical field [0001] The invention belongs to the technical field of hot continuous rolling strips, in particular to a hot-rolled steel plate containing V and Nb composite microalloying and a preparation method thereof, so as to achieve the purpose of controlling the surface quality thereof. Background technique [0002] Hot-rolled steel plates are mainly used to make structural parts, such as automotive frame longitudinal beams, beams, and carriages. The requirements for the strength, toughness, and plasticity of the steel plate are relatively high, and its tensile strength ranges from 370 to 700 MPa. In recent years, the demand for hot-rolled steel sheets with a strength level of 510MPa and above as automotive structures is increasing. At present, domestic iron and steel enterprises usually use V, Ti, and Nb as microalloying elements to produce hot-rolled steel sheets for automobiles according to their respective resource characteristics and process equipment conditions....

AI Technical Summary

Problems solved by technology

It can be seen that the methods for removing the red scale on the surface of hot-rolled steel sheets mainly include mechanical descaling methods, high-pressure water descaling methods and strictly controlling the Si content in the steel to Si≤0.20%. The increase in the production cost of hot-rolled steel sheets

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