600mpa grade thin-gauge hot-rolled automotive structural steel and method produced by short process

Abstract

The invention discloses a 600MPa-grade thin hot-rolled automobile structural steel produced by a short process. The steel is prepared from the following components in percentage by weight: 0.045 to 0.075 percent of C, not more than 0.20 percent of Si, 1.00 to 1.25 percent of Mn, 0.11 to 0.14 percent of Ti, not more than 0.015 percent of Nb, not more than 0.015 percent of V, 0.015 to 0.050 percentof Als, not more than 0.018 percent of P, not more than 0.005 percent of S, and not more than 0.006 percent of N. A production method comprises: performing continuous casting into a thin slab after conventional smelting; soaking the thin slab; performing scale removal for two times; performing finishing rolling for seven times; performing laminar cooling to a coiling temperature; coiling; leveling. According to the invention, the shortcomings of poor plate shape and roll shape, unstable rolling process and the like in the process of rolling the 600MPa-grade thin hot-rolled automobile structural steel by a short process are solved, the high-stability and large-scale production of the 600MPa-grade thin hot-rolled automobile structural steel produced by the short process is realized, the plate shape and the roll shape are excellent, the rolling process is stable, the finished product rate of an original variety is increased to 93 percent or more, and the purpose of replacing a cold-rolledproduct is achieved.

Description

technical field [0001] The invention relates to a steel for automobiles and a production method, specifically belonging to 600MPa-level thin-gauge hot-rolled automotive structural steel and a method thereof, in particular to 600MPa-level thin-gauge hot-rolled automotive structural steel and a method produced by a short process. Background technique [0002] With the depletion of energy and the deterioration of the ecological environment, the lightweight of automobiles has attracted more and more attention. The use of high-strength, thin-gauge automotive steel is an effective means to reduce weight, save energy, and improve safety. Traditional automotive structural steel, especially products with a thickness of less than 2.0mm, adopts a hot-rolled + cold-rolled manufacturing process, which has a long process flow, high energy consumption and high manufacturing costs. With the development of the steel industry, the short-process process has made great progress. The short-proc...

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Problems solved by technology

[0005] The present invention aims to overcome the disadvantages of the short-flow rolling 600MPa-level thin-gauge hot-rolled automotive structural steel in the prior art, which have poor plate shape and coil shape, and unstable rolling process, resulting in the yield of the original product not exceeding 85%. Provide a 600MPa grade thin-gauge hot-rolled automotive structural steel produced by a short process with excellent plate shape and coil shape, stable rolling process, and increase the yield of the original product to more than 93%, and its method

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