800MPa steel based on multi-mode thin slab continuous casting and rolling production line and production method thereof

Abstract

The invention provides 800MPa steel based on a multi-mode thin slab continuous casting and rolling production line, and belongs to the technical field of steel. The 800MPa steel based on the multi-mode thin slab continuous casting and rolling production line comprises the following chemical components in percentage by mass: 0.03 to 0.15 percent of C, less than or equal to 0.05 percent of Si, 1.3 to 2.1 percent of Mn, 0.02 to 0.35 percent of Al, less than or equal to 0.010 percent of P, less than or equal to 0.005 percent of S, 0.010 to 0.10 percent of Nb, 0.10 to 0.30 percent of Mo, 0.015 to 0.15 percent of Ti, 0.1 to 0.5 percent of Cr, less than or equal to 0.005 percent of N and the balance of Fe and inevitable impurities. By improving the chemical components, the production line and the preparation method for the steel, the obtained steel is good in pattern, high in dimensional precision and small in strength fluctuation. The invention further provides a production method for the 800MPa steel based on the multi-mode thin slab continuous casting and rolling production line.

Description

technical field [0001] The invention belongs to the technical field of iron and steel, and relates to an 800MPa steel based on a multi-mode thin slab continuous casting and rolling production line and a production method thereof. Background technique [0002] Driven by factors such as "replacing cold with heat", reducing costs, saving energy and reducing emissions, shortening processes, and improving efficiency, the market demand for high-performance thin / ultra-thin hot-rolled strip steel continues to grow, and endless rolling technology is improving. The proportion of thin-gauge strip steel products, yield, size and shape accuracy, and uniformity of structure and performance have achieved remarkable results in reducing energy consumption, roll consumption, energy saving and emission reduction. In recent years, domestic companies represented by Nippon Steel have put into operation several ESP production lines, which can produce ordinary low-carbon ultra-thin plates and high-...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem of large fluctuations in precision and mechanical properties of thin gauge 800MPa high-strength steel produced by traditional production lines, the present invention provides an 800MPa steel based on a multi-mode thin slab continuous casting and rolling production line. The production line and preparation method are improved, and the tensile strength of the obtained steel reaches more than 800MPa, and the dimensional accuracy is high and the strength fluctuation is small

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