Steel for vehicles with high cold bending performance and manufacturing method thereof

Abstract

The invention discloses steel for vehicles with high cold bending performance and a manufacturing method thereof, and belongs to the field of vehicle steel manufacturing. The steel for the vehicles with high cold bending performance comprises the following components in percentage by mass: 0.01-0.25% of C, 0.10-0.50% of Si, 0.96-2.00% of Mn, P not more than 0.02%, S not more than 0.01%, N not morethan 0.01%, 0.01-0.06% of Al, 0.10-0.50% of Cr, 0.01-0.06% of Nb, 0.01-0.06% of V, 0.03-0.05% of Ti, and the balance of Fe and inevitable impurities; and the steel is prepared through the processes of (1) smelting, (2) blank casting, (3) hot rolling, (4) cold rolling, (5) annealing and (6) hot molding. Through feeding of specific components-microalloy elements and cooperation with the specific manufacturing processes, manufactured steel plates meet the vehicle strength and toughness demands, and achieve high cold bending performance.

Description

technical field [0001] The invention belongs to the field of steel manufacturing for automobiles, and more specifically relates to a steel for automobiles with high cold bending performance and a manufacturing method thereof. Background technique [0002] Automobile lightweight technology is one of the key technologies to adapt to the trend of modern automobile safety, energy saving and environmental protection. At present, more and more automobile body parts use thermoforming technology (such as: automobile bumper, anti-collision beam, A-pillar, B-pillar , door bumper, etc.). Thermoforming technology is a new process that divides forming and strengthening into two steps to produce ultra-high-strength auto parts. The parts produced have the advantages of ultra-high strength, high forming precision, and avoiding springback of high-strength steel cold forming. The high-strength steel plate, exemplified by 22MnB5, is currently the most researched and applied thermoformed struc...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem of poor cold-bending performance of steel sheets for automobiles in the prior art, the present invention provides a steel with high cold-bending performance for automobiles and a manufacturing method thereof, through the addition of specific compositional microalloying elements and a specific manufacturing process, to manufacture steel sheets Meet the strength and toughness requirements of automobiles and have high cold bending performance

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