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

Abstract

The invention relates to a hot-rolled high-strength steel straightening and leveling process, which is characterized in that the straightening and leveling process is adopted, and the hot-rolled high-strength steel strip is sequentially sent into a straightening machine and a leveling machine; the above-mentioned process specifically includes the following steps: first, according to The required yield strength of the strip product at the end of the process 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 to pre-set the straightening and leveling process; after that, real-time detection of processing Finally, compare the detected 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 process section The total elongation is constant, and while the leveler is used to reduce the residual stress level of the strip, the performance quality of the strip product at the end of the process section is guaranteed. By adopting the process, the residual stress level inside the hot-rolled steel strip can be fully reduced, and the performance quality of the hot-rolled high-strength steel product can be effectively improved.

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. Background technique [0002] 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 hot-rolle...

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

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