Ultrafine-grain hot-rolling dual phase steel plate for automobile and production method thereof

A technology of ultra-fine grains and production methods, applied in the direction of temperature control, etc., to achieve the effects of good hole expansion performance, uniform product quality and high formability

Inactive Publication Date: 2012-10-10
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of the problems existing in the existing high-strength automotive ultra-fine-grained dual-phase steel sheets and production processes, a low-cost, uniform performance, high formability, simple process and easy industrial production of automotive ultra-fine-grained dual-phase steel sheets and its production method

Method used

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  • Ultrafine-grain hot-rolling dual phase steel plate for automobile and production method thereof
  • Ultrafine-grain hot-rolling dual phase steel plate for automobile and production method thereof
  • Ultrafine-grain hot-rolling dual phase steel plate for automobile and production method thereof

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Embodiment Construction

[0027] Examples of the invention are as follows: heat the continuous casting slab (200×1500mm) to 1150-1300°C, heat it for 2-3 hours, then carry out rough rolling, cover the heat preservation cover after the rough rolling, and then finish rolling under high pressure in multiple passes. The rolling temperature is 800-850°C, laminar flow cooling is adopted after rolling, and the coiling temperature is cooled to the coiling temperature at a cooling rate of 25-30°C / s, and the coiling temperature is 400-450°C. The finished thickness of the steel plate is 4mm. The specific steel composition of the five embodiments of the present invention is shown in Table 1, the actual rolling system is shown in Table 2, and the various performance indexes of the steel plate are shown in Table 3.

[0028] Table 1 Melting composition (wt, %) of dual-phase steel plate of the present invention

[0029] Example ingredients

C

Si

mn

P

S

Nb

Example 1

0....

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Abstract

The invention discloses an ultrafine-grain hot-rolling dual phase steel plate for automobiles and a production method thereof. The chemical constituent of the steel plate comprises, by mass, 0.07%-0.09% of C, 0.2%-0.5% of Si, 1.3%-1.5% of Mn, 0.03%-0.05% of Nb, less than 0.02% of P, and less than 0.01% of S, and the balance being iron and ineluctable impurities, wherein the volume fraction of ferrite is between 60% and 80%, the volume fraction of bainite is between 20% and 40%, the average grain diameter is between 2-3 mu m. The production method comprises that: continuous casting blanks are heated to 1150-1300 DEG C and insulated for 2-3 h. The rolling temperature is between 1100-1200 DEG C and the finishing temperature>950 DEG C during rough rolling. During finish rolling, the initial rolling temperature is between 890-950 DEG C and the final rolling temperature>800 DEG C. A laminar flow cooling technology is utilized and rapid cooling is carried out. The cooling speed is controlled between 25-35 DEG C/s and coiling is carried out when the temperature is between 400-450 DEG C finally. The steel plate and the production method thereof have the advantages of low cost without adding noble metals such as Cr, Mo; simple technology without subsection cooling, easy production control; uniform and consistent product performance and good formability. The steel plate and the production method thereof are mainly used for stamping workpieces of automobile wheels and girders.

Description

technical field [0001] The invention relates to a steel plate for automobiles, in particular to an ultrafine-grain hot-rolled dual-phase steel plate for automobiles and a production method thereof. Background technique [0002] At present, the automobile industry has become the pillar industry of our country. With the development of the automobile industry, for the consideration of energy saving and resource conservation, it is the general trend to reduce the weight of the structure, which requires higher and higher strength of steel. [0003] Improving the strength of steel through grain ultra-refinement has become an option. A large number of studies have proved that ultra-fine grain steel does have very high strength and hardness, and at the same time, the toughness is also significantly improved. In addition, the ultra-fine grain makes it possible to greatly increase the strength of steel without relying on adding more carbon and alloying elements, which not only helps...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12B21B37/74
Inventor 韩斌时晓光刘仁东董毅徐鑫
Owner ANGANG STEEL CO LTD
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