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Continuous leveling method of 700MPa-level thin-gauge hot-rolled high-strength steel

A thin-gauge, high-strength steel technology, applied in metal rolling, contour control, etc., to reduce leveling costs, speed up production efficiency, and improve product quality

Inactive Publication Date: 2020-10-20
RIZHAO STEEL HLDG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the edge wavy defects caused by uneven internal stress in 700MPa-level thin-gauge hot-rolled high-strength steel, the present invention provides a continuous skinning method for 700MPa-level thin-gauge hot-rolled high-strength steel. The extension of the rolling and tension leveling machine eliminates the internal stress, and then realizes the smoothing of high-strength steel edge waves

Method used

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  • Continuous leveling method of 700MPa-level thin-gauge hot-rolled high-strength steel

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Continuous leveling is performed on a roll of 700MPa thin-gauge hot-rolled high-strength steel with a thickness of 1.5mm. The hot-rolled high-strength steel is welded with 700MPa hot-rolled high-strength steel with a thickness in the range of 1.3-1.8mm to reduce the thickness of the continuous leveling strip. coming influence;

[0023] The hot-rolled high-strength steel passes through the temper mill and the tension leveler in turn. The temper mill adopts the rolling force mode, the rolling force of the temper mill adopts 3200KN, and the temper mill tilt adopts 200KN;

[0024] The tension leveler adopts the extension mode, and the elongation rate is 0.1%.

Embodiment 2

[0026] Continuous leveling is performed on a coil of 700MPa thin-gauge hot-rolled high-strength steel with a thickness of 2.0mm. The hot-rolled high-strength steel is welded with 700MPa hot-rolled high-strength steel with a thickness ranging from 1.6 to 2.5mm to reduce the thickness of the continuous leveling strip. coming influence;

[0027] The hot-rolled high-strength steel passes through the temper mill and the tension leveler in sequence. The temper mill adopts the rolling force mode, the rolling force of the temper mill adopts 2500KN, and the temper mill tilt adopts 100KN;

[0028] The tension leveler adopts the extension mode, and the elongation rate is 0.2%.

Embodiment 3

[0030] Continuous leveling is performed on a roll of 700MPa thin-gauge hot-rolled high-strength steel with a thickness of 2.5mm. The hot-rolled high-strength steel is welded with 700MPa hot-rolled high-strength steel with a thickness in the range of 2.0-3.0mm to reduce the thickness of the continuous leveling strip. coming influence;

[0031] The hot-rolled high-strength steel passes through the temper mill and the tension leveler in sequence. The temper mill adopts the rolling force mode, the rolling force of the temper mill adopts 2700KN, and the temper mill tilt adopts 150KN;

[0032] The tension leveler adopts the extension mode, and the elongation rate is 0.2%.

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Abstract

The invention relates to the technical field of production of thin-gauge hot-rolled high-strength steel, in particular to a continuous leveling method of 700MPa-level thin-gauge hot-rolled high-strength steel. The continuous leveling method of the 700MPa-level thin-gauge hot-rolled high-strength steel comprises the following steps that the 700MPa-level thin-gauge hot-rolled high-strength steel isproduced by using a leveling machine and a withdrawal and straightening machine in sequence, wherein the leveling machine adopts a roll force mode, the rolling force ranges from 1000 KN to 8000 KN, and the inclination range ranges from negative 300 KN to 300 KN; and the withdrawal and straightening machine adopts an elongation rate mode, and the elongation rate range is 0.1%-0.3%. According to thecontinuous leveling method, internal stress is eliminated through rolling of the leveling machine and extension of the withdrawal and straightening machine in sequence, and then leveling of high-strength steel edge waves is achieved.

Description

technical field [0001] The invention relates to the technical field of thin-gauge hot-rolled high-strength steel production, in particular to a continuous leveling method for 700MPa-level thin-gauge hot-rolled high-strength steel. Background technique [0002] The flatness of the strip is an important quality indicator that end users are concerned about. The quality of the strip not only affects the appearance of the product, but also affects the processing and welding of parts. [0003] Due to the relatively poor production stability of hot-rolled high-strength steel, uneven internal stress is more likely to occur, resulting in various plate shape defects. Wave shape defect is a common plate shape defect caused by uneven deformation of the plate and uneven internal stress caused by the joint action of temperature, phase transformation and other factors during the rolling process. Usually, the thinner the product, the poorer the plate shape. The higher the rate. At present...

Claims

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Application Information

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IPC IPC(8): B21B1/24B21B37/28
CPCB21B1/24B21B37/28
Inventor 赵文陈福林苏玉柱郭久明刘启森丁明光马锦峰赵任王欢龙李晓冬赵景全常智乾
Owner RIZHAO STEEL HLDG GROUP