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Reduction of Residual Stress by Reducing Lateral Temperature Difference of Hot Strip after Rolling

A technology of residual stress and hot-rolled strip steel, applied in the direction of contour control, etc., can solve problems such as strip bending and waves, and achieve the effects of reducing transverse temperature difference, improving strip shape, and reducing edge wave defects

Active Publication Date: 2018-10-26
SHANGHAI MEISHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual rolling cooling process, due to the joint action of thermal stress and structural stress caused by cooling rate and cooling uniformity, etc., it is easy to cause plate shape problems such as buckle and wave.

Method used

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  • Reduction of Residual Stress by Reducing Lateral Temperature Difference of Hot Strip after Rolling
  • Reduction of Residual Stress by Reducing Lateral Temperature Difference of Hot Strip after Rolling
  • Reduction of Residual Stress by Reducing Lateral Temperature Difference of Hot Strip after Rolling

Examples

Experimental program
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Effect test

Embodiment 1

[0047] Implement the present invention in 1780 production lines of certain hot-rolling factory. For a certain batch of strip steel that is prone to wave shape tracking, the width of the strip steel is 1300mm, and the thickness is 2.75mm. Block the edge nozzles of the cooling water between the racks between F5-F6 until the remaining 1200mm in the middle, track the exit temperature of the finish rolling, the average temperature difference between the edge and the middle is 27°C, and the temperature difference is less than 30°C, satisfying The temperature control object of the present invention. Tracking the shape of the strip steel, there is no wave shape in the strip steel. According to the wave shape theory, it shows that the residual stress of the strip steel decreases.

[0048] image 3 It is the head 200m position and the tail 200m position of a coil of this kind of strip steel. When the cooling water between the racks is turned on during the production of the tail of th...

Embodiment 2

[0051] A certain batch of strip steel has a width of 1400mm and a thickness of 3.5mm. Block the side nozzles of the cooling water between F6-F7 racks, track the exit temperature of the finish rolling to the remaining 1300mm in the middle, the average temperature difference between the side and the middle is 32°C, and the temperature difference is less than 36°C, which meets the temperature control target of the present invention . Tracking the shape of the strip steel, there is no wave shape in the strip steel. According to the wave shape theory, it shows that the residual stress of the strip steel decreases.

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Abstract

The invention provides a method for reducing the quantity of residual stress by reducing the transverse temperature difference generated after rolling of hot rolling strip steel. The method comprises the steps that for the strip steel with the width ranging from 1050mm to 1500mm and the thickness ranging from 1.8mm to 8mm, a method for separately blocking cooling water side portion nozzles among F3-F7 racks is adopted, so that the transverse temperature difference generated after hot rolling of the strip steel is reduced; furthermore, residual stress is reduced; according to different thickness and width specifications, a control target of the transverse temperature difference generated after hot rolling of the strip steel is set; and the transverse temperature difference of the strip steel is controlled below the control target of the transverse temperature difference generated after hot rolling of the strip steel. By means of the method, the transverse temperature difference of the hot-rolled strip steel is effectively lowered; and the effect that performance of the strip steel is not influenced can be achieved, and rolling stability is not influenced.

Description

Technical field: [0001] The invention relates to a method for reducing the residual stress by reducing the transverse temperature difference after hot strip rolling. Background technique: [0002] The iron and steel industry is the basic industry of the national economy and plays a very important role in national construction. In recent years, China's iron and steel industry has made great progress and has become the world's largest steel producer, importer and consumer. to a positive effect. But at the same time, with the increase of steel production, the overall demand for steel has declined, resulting in a relative surplus of production. In this situation, the competition among various iron and steel enterprises is becoming increasingly fierce, and they need to accelerate industrial upgrading and improve product quality to enhance the competitiveness of enterprises. [0003] In this context, the market has higher and higher requirements for strip shape. Flatness contr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B37/44
Inventor 夏小明付文鹏
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
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