Zirconium-containing fine-grain hot-rolled plate strip steel and preparation method thereof

Abstract

The invention discloses zirconium-containing fine-grain hot-rolled plate strip steel and a preparation method thereof, and belongs to the field of steel production. The zirconium-containing fine grain hot-rolled plate strip steel comprises the following components, by mass: 0.03 to 0.25 percent of C, 0.05 to 0.5 percent of Si, 0.8 to 2.0 percent of Mn, 0.002 to 0.03 percent of P, 0.001 to 0.03 percent of S, 0.003 to 0.07 percent of Al, 0.002 to 0.05 percent of Ti, 0.001 to 0.03 percent of Zr, 0.001 to 0.012 percent of O, 0.002 to 0.012 percent of N and the balance of Fe and inevitable impurities. The zirconium-containing fine grain hot-rolled plate strip steel comprises Al2O3 inclusions, TiOx inclusions, TiN inclusions, AlN inclusions, MnS inclusions, ZrO2 inclusions, ZrN inclusions and other inevitable inclusions. The preparation method comprises the steps of smelting, refining, continuous casting, hot rolling and cooling; according to the method, hot rolled strip steel components and inclusions are optimally designed, smelting and rolling process improvement is combined, grain size refinement under the high-temperature rolling condition is achieved, and then the toughness of the steel is improved.

Description

[0001] This application is a divisional application with the application number 202110238994.0, the application date is March 4, 2021, and the title of the invention is "a fine-grained hot-rolled strip steel and its preparation method". technical field [0002] The invention belongs to the technical field of iron and steel production, in particular to a zirconium-containing fine-grained hot-rolled strip steel and a preparation method thereof. Background technique [0003] Low-alloy high-strength hot-rolled strip steel is widely used in economic and social construction. With the continuous improvement of industrial production technology, the production and application of hot-rolled strip steel is developing in the direction of high strength and toughness, low alloy cost and high production efficiency. There are many ways to improve the strength of the steel plate, but grain refinement can improve the strength and toughness at the same time, and save the amount of alloy additio...

AI Technical Summary

Problems solved by technology

[0017] The above-mentioned existing technologies can obtain fine-grained structures to meet the performance requirements after increasing the rolling temperature, but all adopt the method of alloying or ultra-fast cooling immediately after rolling, which brings pressure on production costs and technical implementation

However, there is no relevant existing technology that can be adopted to achieve this purpose, and further in-depth research is needed

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