High-strength thin steel plate produced by CSP (cast steel plate) process and preparation method of plate

Abstract

The invention discloses a high-strength thin steel plate produced by a CSP (cast steel plate) process and a preparation method of the plate. The high-strength thin steel plate comprises the following components by percent: 0.15-0.25 of C, not larger than 0.10 of Si, 1.00-1.80 of Mn, not larger than 0.020 of P, not larger than 0.010 of S, 0.09-0.20 of Ti, 0.02-0.08 of Als, and not larger than 0.008 of N; and the metallographic structure is a mixture of 20-35% of perlite, 55-75% ferrite and a little of bainite. The preparation method of the high-strength thin steel plate comprises the following steps of smelting and carrying out continuous cast to form blanks; uniformly heating; rolling; carrying out laminar cooling; and reeling. According to the thin steel plate with a hot-rolled structure, disclosed by the invention, the yield strength (ReL) is not less than 700 MPa, the tensile strength (Rm) is not less than 750 MPa, and the wear resistance is good; and according to the preparation method disclosed by the invention, a hot rolling process can replace a cold rolling process, a thin steel plate can replace a thick steel plate, and the prepared high-strength thin steel plate can totally meet requirements of high-strength steel for an engineering structure.

Description

technical field [0001] The invention relates to microalloyed steel and a preparation method thereof, in particular to a high-strength thin steel plate produced by a CSP process and a preparation method thereof. Background technique [0002] With the development of industrial technology and the improvement of scientific and technological capabilities, many parts that could only use cold-rolled high-strength steel have been gradually replaced by hot-rolled thin plates. The CSP (Continuous Casting and Rolling) production line provides a good platform for the development and production of hot-rolled high-strength steel sheets with its unique process flow. There have been many achievements in the design and manufacture of hot-rolled high-strength steel by using thin slab continuous casting and rolling production lines at home and abroad. For example, patents such as CN200510036889. For the production process, Zhuzhou Iron and Steel Co., Ltd. and Lianyuan Iron and Steel Co., Ltd....

AI Technical Summary

Problems solved by technology

According to the above related studies, high Ti steel with low carbon composition can meet the strength requirements, but due to the low carbon content, the surface hardness of the steel produced is too small, so it can only be applied to general structural parts, and cannot meet the requirements such as load compartment structure, high strength Structural outer panels and other structures with surface properties

At the same time, limited by equipment conditions, the conventional soaking temperature is below 1200°C, which greatly limits the solid solution effect of Ti in the billet and reduces the microalloying effect of Ti element

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