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Hot-rolled steel sheet for automobile and producing method thereof

A technology of hot-rolled steel sheet and production method, applied in heat treatment equipment, heat treatment process control, temperature control and other directions, can solve the problems of large fluctuation of mechanical properties, easy cracking in stamping, low elongation, etc., and achieves good matching of strength and toughness. The effect of small performance difference and excellent molding performance

Active Publication Date: 2007-09-12
PANZHIHUA IRON AND STEEL
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are mainly two kinds of hot-rolled steel sheets for automobile beams. One is to use niobium microalloying to produce hot-rolled steel sheets for automobile beams. There are higher requirements; the other is to use vanadium microalloying to produce hot-rolled steel plates for automobile beams. However, during the use of the steel plates, there are "mottle" defects, large fluctuations in mechanical properties, high strength, and low elongation. Low, stamping is easy to crack

Method used

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Embodiment Construction

[0009] The production process of the present invention is: molten iron pretreatment→converter→external refining→casting→heating→rough rolling→hot coiling→finish rolling→cooling→coiling. The present invention reduces the silicon content by controlling the addition of Fe-Si to improve the surface quality of the steel plate; increases the manganese content by controlling the addition of Fe-Mn to ensure the strength of the steel plate; reduces the temperature of the hot continuous rolling process and other technical measures , to control the surface quality of the steel plate; determine the coiling temperature and laminar cooling method and other technical measures to control the mechanical properties of the steel plate according to the thickness and carbon equivalent of the finished product.

[0010] The invention adopts vanadium as the microalloying element of the hot-rolled steel plate for the automobile beam, and continuously casts it into a slab. Controlled rolling and contro...

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Abstract

This invention provides a hot-rolled armor plate used in car-beams composed of the following chemical composition in weight percentage: C: 0.07-0.12%, Si: 0.15-0.30%, Mn: 1.05-1.25%, V: 0.06-0.10%, P smaller than or equal to 0.025% and S smaller than or equal to 0.015%, which has the advantages of finish surface, stable dynamic performance, small anisotropy, fine match of obdurability and excellent molding performance.

Description

technical field [0001] The invention relates to a hot-rolled steel plate and a production method thereof, in particular to a hot-rolled steel plate for an automobile beam and a production method thereof. Background technique [0002] The use conditions of hot-rolled steel plates for automobile beams are very strict, not only requiring good strength, toughness, and plasticity, but also because the automobile frame (such as beams, longitudinal beams) has changed from the original internal parts to exterior parts, the surface quality requirements are also getting higher. [0003] At present, there are mainly two kinds of hot-rolled steel sheets for automobile beams. One is to use niobium microalloying to produce hot-rolled steel sheets for automobile beams. There are higher requirements; the other is to use vanadium microalloying to produce hot-rolled steel plates for automobile beams. However, during the use of the steel plates, there are "mottle" defects, large fluctuations ...

Claims

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Application Information

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IPC IPC(8): C22C38/12C22C33/04C21D8/02C21D11/00B21B37/74B21D5/00
Inventor 左军杨金成李贵学佘广夫刘勇杨秀亮李正荣张均详
Owner PANZHIHUA IRON AND STEEL