Production process for optimizing high-strength steel finish rolling reduction rate distribution

Abstract

The invention discloses a production process for optimizing high-strength steel finish rolling reduction rate distribution, and relates to the technical field of high-strength steel finish rolling, in particular to a process technology for guaranteeing stable operation of a finish rolling machine by optimizing thin-gauge high-strength steel finish rolling reduction rate distribution. The production process comprises the following steps of heating in a heating furnace, rough rolling, reduction of F1 and F2 racks, reduction of F3 racks, reduction of F4 racks, reduction of F5 and F6 racks, reduction of F7, plate shape control, cooling control and coiling. In the rough rolling step, the thickness of an intermediate billet needs to be reduced on the premise of ensuring the total reduction rate; the reduction rate of the F1 rack and the F2 rack is lower than 50%; the reduction rate of an F3 rack is lower than 40%; the reduction rate of the F4 rack is less than 30%; the reduction rate of the F7 rack is 8%; and the residual pressure load is distributed by the F5 and the F6. According to the technical scheme, the problems that in the prior art, an F1-F3 rack bears most loads, due to the fact that rolling reduction and rolling force are too large, rack vibration is generated, transverse vibration lines appear on a rolled piece at an outlet of a vibration rack, and the phenomena of steel stacking, steel breaking or rolling mill equipment damage are easily caused are solved.

Description

technical field [0001] The invention discloses a production process for optimizing the distribution of reduction ratio in finishing rolling of high-strength steel, and relates to the technical field of finishing rolling of high-strength steel, in particular to a technology for ensuring stable operation of a finishing mill by optimizing the distribution of reduction ratio in finishing rolling of thin-gauge high-strength steel. Background technique [0002] At present, in the process of rolling thin-gauge products in 2300mm units, due to the large total reduction rate, when calculating the automatic reduction load distribution model of the secondary control system, most of the load is distributed on F1-F3 stands; When making thin-gauge high-strength steel products, especially products with a thickness of ≤3.0mm, the vibration of the F1-F3 frames often occurs due to the excessive reduction and rolling force; Transverse vibration marks appear; on the other hand, it is very easy ...

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Problems solved by technology

[0002] At present, in the process of rolling thin-gauge products in the 2300mm unit, due to the large total reduction rate, when calculating the automatic reduction load distribution model of the secondary control system, most of the load is distributed on F1-F3 stands; When making thin-gauge high-strength steel products, especially products with a thickness of ≤3.0mm, the F1-F3 frames often appear to vibrate due to excessive reduction and rolling force; Transverse vibration marks appear; on the other hand, it is very easy to pile up steel, break the strip or damage the rolling mill equipment, etc.

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