Ti-containing medium-carbon steel, as well as method for continuous casting and continuous rolling by adopting sheet billets

Abstract

The invention relates to Ti-containing medium-carbon steel for a car floor or a cold roll forming structural piece, as well as a method for continuous casting and continuous rolling by adopting sheet billets. The Ti-containing medium-carbon steel comprises the following constituents by weight percent: 0.17 to 0.20 percent of C, 0.1 to 0.4 percent of Si, 0.6 to 1.8 percent of Mn, 0.04 to 0.15 percent of Ti, 0.02 to 0.06 percent of Als, 0 to 0.025 percent of P, 0 to 0.005 percent of S, 0 to 0.65 percent of Ni, 0 to 0.2 percent of Cu, and 0 to 0.008 percent of N. The Ti-containing medium-carbon steel is produced according to the following steps: smelting; outside furnace refining and continuous casting to produce casting blanks; uniformly heating the casting blanks; rolling; reeling after laminar flow; and standing by. As the Ti-containing medium-carbon steel and the method are adopted, the invention has the advantages that the constituents are simple; a steel plate has no internal stress; the shape of the steel plate is beautiful; and the yield strength is at least 550 MPa.

Description

technical field [0001] The invention relates to a steel material and a production method, in particular to a Ti-containing medium-carbon steel with a yield strength of more than 500 MPa, which is used for automobile bottom plates or cold-formed structural parts, and a method for producing it by continuous casting and rolling of thin slabs. Background technique [0002] Under the current situation, the requirements for load-bearing components are becoming more and more lightweight and high-strength, that is, the yield strength must reach at least 550MPa, so as to reduce energy consumption and carbon emissions during use, and reduce environmental pollution. To achieve the purpose of energy saving and emission reduction. [0003] At present, microalloyed steel is a new type of low-alloy high-strength steel with high performance. Generally, low-carbon plus Nb, V, Ti, Mo, etc. as the main strengthening mechanism. At present, various hot-rolled high-strength steel plates have be...

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Problems solved by technology

[0026] The purpose of the present invention is to overcome the disadvantages of the existing technology that the plate shape cannot meet the market requirements due to the large residual internal stress of low-carbon steel, and the low-carbon steel adds more microalloying elements, resulting in high cost, and provides a low-carbon steel with simple components. 1. There is no internal stress in the steel plate, the plate shape is good, and the hot-rolled Ti-containing medium carbon steel produced by thin slab continuous casting and rolling meets the yield strength of at least 550MPa

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