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Cold-rolled hot-molded steel plate and production method thereof

A production method and thermoforming technology, applied in the field of metal material processing, can solve the problems of poor formability of high-strength steel plates, prone to wrinkling, cracking, springback, etc., to achieve good thermoforming performance, improve strength and safety factor, considerable economic effect

Inactive Publication Date: 2013-10-23
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the poor formability of the existing high-strength steel plates for automobiles, which are prone to wrinkling, cracking, springback and other problems when stamping complex parts, and to provide a thermoforming performance that can reduce stamping pressure. The cold-rolled and hot-formed steel sheet with the risk of wrinkling, cracking and springback also provides the manufacturing method of the above-mentioned cold-rolled and hot-formed steel sheet

Method used

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  • Cold-rolled hot-molded steel plate and production method thereof
  • Cold-rolled hot-molded steel plate and production method thereof
  • Cold-rolled hot-molded steel plate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A cold-rolled hot-formed steel sheet provided in this embodiment, the mass percentage of the chemical composition is as follows:

[0063] C: 0.25%; Si: 0.30%; Mn: 1.40%; P: 0.020%; S: 0.0030%;

[0064] Cr: 0.30%; Alt: 0.060%; B: 0.0040%; Ti: 0.050%; N: 0.006%; Fe: 97.607%.

[0065] The molten iron with the above proportioning composition is refined and then continuously cast to obtain a slab, the slab is heated, and the heated slab is hot-rolled to obtain a hot-rolled plate, which is coiled after laminar flow cooling of the hot-rolled plate to obtain a hot-rolled plate. For rolling coils, the finishing temperature of hot rolling is 920°C, and the coiling temperature is 600°C. The hot-rolled coils are cold-rolled to obtain chilled coils, and the cold-rolling reduction rate is controlled at 70%. Then, the bell annealing process is adopted, and the temperature is raised to 400°C by rapid heating first, and then the steel coil is heated slowly at a heating rate of 35°C / h....

Embodiment 2

[0067] A cold-rolled hot-formed steel sheet provided in this embodiment, the mass percentage of the chemical composition is as follows:

[0068] C: 0.23%; Si: 0.25%; Mn: 1.3%; P: 0.014%; S: 0.0025%;

[0069] Cr: 0.17%; Alt: 0.035%; B: 0.0032%; Ti: 0.035%; N: 0.004%; Fe: 97.9563%.

[0070] The molten iron with the above proportioning composition is refined and then continuously cast to obtain a slab, the slab is heated, and the heated slab is hot-rolled to obtain a hot-rolled plate, which is coiled after laminar flow cooling of the hot-rolled plate to obtain a hot-rolled plate. For rolling coils, the finishing temperature of hot rolling is 920°C, and the coiling temperature is 600°C. The hot-rolled coil is cold-rolled to obtain a chilled coil, and the cold-rolling reduction rate is controlled at 60%. Then, the bell annealing process is adopted, and the temperature is raised to 400°C by rapid heating first, and then the steel coil is heated slowly at a heating rate of 30°C / h. ...

Embodiment 3

[0072] A cold-rolled hot-formed steel sheet provided in this embodiment, the mass percentage of the chemical composition is as follows:

[0073] C: 0.22%; Si: 0.24%; Mn: 1.28%; P: 0.015%; S: 0.0024%;

[0074] Cr: 0.216%; Alt: 0.0314%; B: 0.0032%; Ti: 0.028%; N: 0.0028%; Fe: 97.9612%.

[0075] The molten iron with the above proportioning composition is refined and then continuously cast to obtain a slab, the slab is heated, and the heated slab is hot-rolled to obtain a hot-rolled plate, which is coiled after laminar flow cooling of the hot-rolled plate to obtain a hot-rolled plate. For rolling coils, the finishing temperature of hot rolling is 900°C, and the coiling temperature is 590°C. The hot-rolled coils are cold-rolled to obtain chilled coils, and the cold-rolling reduction rate is controlled at 65%. Then, the bell annealing process is adopted, and the temperature is raised to 400°C by rapid heating first, and then the steel coil is heated slowly at a heating rate of 35°...

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Abstract

The invention discloses a cold-rolled hot-molded steel plate. The cold-rolled hot-molded steel plate is produced from the following chemical components in percentage by weight: 0.22-0.25% of C, 1.20-1.40% of Mn, 0.20-0.30% of Si, less than or equal to 0.020% of P, less than or equal to 0.0030% of S, 0.10-0.30% of Cr, 0.020-0.050% of Ti, 0.025-0.060% of Alt, 0.0020-0.0040% of B, less than or equal to 0.006% of N and the balance of Fe. The invention further discloses a method for producing the cold-rolled hot-molded steel. The method comprises the following steps of: refining molten steel, and casting continuously to obtain a steel plate blank; carrying out hot rolling on the steel plate blank, and cooling the hot-rolled steel plate blank by laminar flow to obtain a hot-rolled coil; carrying out cold rolling on the hot-rolled coil to obtain a cold-rolled coil; and finally annealing the cold-rolled coil in a cover to obtain strip steel. By adjusting the chemical components and optimizing the hot rolling, cold rolling, cover-type annealing and flattening parameters, the high-strength hot-molded steel plate can be produced successfully. The high-strength hot-molded steel plate has good hot molding performance and low stamping wrinkling, cracking and retracting risks so that a molded part has high strength and safety factor.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a cold-rolled hot-formed steel plate and a production method thereof. Background technique [0002] With the increasing requirements for energy saving and consumption reduction of automobiles in various countries and the strengthening of collision safety regulations in the United States, Europe and Japan, high-strength steel plates are widely used, and the strength level continues to increase, from high-strength steel to ultra-high-strength steel. Due to the large number of high-strength steel plates used in the car body structure, it can not only reduce the weight of the car body and reduce fuel consumption, but also significantly improve the bending rigidity and torsional rigidity of the car body, and the safety of the whole car is also greatly improved. [0003] The ultra-high-strength steel plate has high strength, but the plastic deformation range is very n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/32C21D8/02
Inventor 陈波郗钊滕华湘李学涛何砚忠任斌李卫峰陈圣杨毕安园
Owner SHOUGANG CORPORATION
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