500mpa grade thin-gauge hot-rolled automotive structural steel and method produced by short process

Abstract

The invention discloses 500 MPa class thin-specification hot-rolled automobile structural steel produced by using a short process. The components of the 500 MPa class thin-specification hot-rolled automobile structural steel are as follows by weight percentage, 0.040-0.070% of C, no more than 0.20% of Si, 1.0-1.25% of Mn, 0.025-0.045% of Ti, 0.025-0.055% of Nb, no more than 0.015% of V, 0.020-0.060% of Als, no more than 0.020% of P, no more than 0.008% of S, no more than 0.006% of N. A production method comprises the steps that a thin slab billet is casted continuously after conventional smelting, uniform heating is conducted on the thin slab billet, twice descaling is conducted, and seven times finishing rolling is conducted; and the laminar flow is cooled to the coiling temperature, coiling is conducted, and leveling is conducted. According to the500 MPa class thin-specification hot-rolled automobile structural steel and the method, the shortcomings that the plate shape and coil shape are bad, and the rolling process is unstable in the rolling process of 500 MPa class thin-specification hot-rolled automobile structural steel using a short process are overcome, the high-stabilityand large-scale production of the 500 MPa class thin-specification hot-rolled automobile structural steel rolled by using a short process is achieved, the plate shape and the roll shape are excellent,the rolling process is stable, the original variety yield is increased to more than 90%, and the purpose of replacing cold rolling products is achieved.

Description

technical field [0001] The invention relates to a steel for automobiles and a production method, specifically belonging to 500MPa-level thin-gauge hot-rolled automotive structural steel and a method thereof, specifically 500MPa-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-process ...

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Problems solved by technology

[0005] The present invention aims to overcome the disadvantages in the prior art that the short-flow rolling process of 500MPa-level thin-gauge hot-rolled automotive structural steel has poor plate shape and coil shape, and the rolling process is unstable, resulting in the yield of the original product not exceeding 80%. Provide a 500MPa-level 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 90%, and its method

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