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Straightening and leveling process for hot-rolled high-strength steel

A high-strength steel and process technology, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve the problems of uneven heating and high residual stress level of high-strength steel products

Active Publication Date: 2012-08-08
WISDRI ENG & RES INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for high-strength steel products, the residual stress level inside the high-strength steel products is much higher than that of ordinary hot-rolled products due to deformation and uneven heating during the previous hot-rolling process.
Therefore, the residual stress inside the high-strength steel product remains at a relatively high level after being processed by the hot-rolled tempering unit, causing many quality problems in subsequent processing

Method used

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  • Straightening and leveling process for hot-rolled high-strength steel
  • Straightening and leveling process for hot-rolled high-strength steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The straightening and leveling process of hot-rolled high-strength steel is characterized in that the straightening and leveling process is adopted, and the hot-rolled high-strength steel strip is sent to a straightening machine, and then sent to a leveling machine; the above-mentioned process specifically includes the following steps: first, according to the process The required yield strength of the strip product at the end of the section sets the total elongation of the unit; then, the set value of the total elongation is assigned to the straightening machine and the tempering machine for pre-setting of the straightening and leveling process; after that, real-time detection after processing The total elongation of the strip; finally, compare the detected actual total elongation of the processed strip with the set value of the total elongation, and dynamically adjust the rolling force of the temper mill in real time to ensure that the strip product at the end of the pro...

Embodiment 2

[0030] Embodiment 2: On the basis of the above-mentioned embodiment 1, 80% of the total elongation setting value is distributed to the straightener 3, and the pressing depth of the upper roller of the straightener is set in a preset manner; the total elongation 20% of the rate set value is assigned to the tempering machine 4 to pre-set the rolling force; The deviation signal is fed back to the rolling force control system of the temper mill 4, and the stability of the total elongation of the process section is ensured through the adjustment of the rolling force of the temper mill 4, thereby fully reducing the strip residual stress level while ensuring Product performance quality.

Embodiment 3

[0031] Embodiment 3: On the basis of the above-mentioned embodiment 1, 70%~90% of the total elongation is allocated to the straightener 3, and the pressing depth of the upper roller of the straightener is set in a preset manner; the total elongation The remaining proportion of the ratio is assigned to the tempering machine 4 to pre-set the rolling force; when there is a deviation between the total elongation of the strip processed in the straightening and leveling process section and the total elongation set value, the deviation signal Feedback to the rolling force control system of the temper mill 4 to ensure the stability of the total elongation of the process section through the adjustment of the rolling force of the temper mill 4, thereby fully reducing the residual stress level of the strip and at the same time ensuring the performance and quality of the product .

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Abstract

The invention relates to a straightening and leveling process for hot-rolled high-strength steel. The straightening and leveling process is characterized in that: hot-rolled high-strength band steel is fed into a straitening machine and a leveling machine in sequence. The process comprises the following specific steps of: firstly, setting the total elongation rate of a unit according to yield strength needed by a band steel product on the tail of a process section; secondly, distributing a total elongation rate set value to the straitening machine and the leveling machine for presetting the straightening and leveling process; thirdly, detecting the total elongation of detected and processed band steel in real time; and lastly, comparing the total elongation of the detected and processed band steel with the total elongation rate set value, dynamically adjusting the rolling force of the leveling machine in real time to ensure that the total elongation rate of a band steel product on the tail of the process section is constant, lowering the residual stress level of the band steel by using the straightening machine, and ensuring the performance quality of the band steel product on the tail of the process section. Due to the adoption of the process, the internal residual stress level of the hot-rolled band steel can be lowered fully, and the performance quality of a hot-rolled high-strength steel product is improved effectively.

Description

technical field [0001] The invention belongs to the technical field of hot-rolled high-strength steel leveling, and in particular relates to a straightening and leveling production process for improving the performance and quality of hot-rolled high-strength steel, which can be applied to various high-strength steel hot-rolling and leveling units. [0002] Background technique [0003] Traditionally, hot-rolled skin pass units are generally used for deep processing of hot-rolled products, so as to effectively improve the flatness accuracy, thickness accuracy and surface quality of hot-rolled products. However, for high-strength steel products, due to deformation and uneven heating during the previous hot-rolling process, the residual stress level inside the high-strength steel products is much higher than that of ordinary hot-rolled products. Therefore, the residual stress inside the high-strength steel product remains at a relatively high level after being processed by the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21D1/02B21B15/00
Inventor 丁文红安甲乙
Owner WISDRI ENG & RES INC LTD
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