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Cooling method and cooling device for hot-rolled steel strip

一种冷却装置、冷却方法的技术，应用在工件冷却装置、金属轧制、金属轧制等方向，能够解决刚性弱、困难、易弹起或卷起等问题，达到简便冷却速度的效果

Active Publication Date: 2015-09-02
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Furthermore, in the hot-rolled steel strip, the passability of the steel strip changes due to the thickness of the strip in particular, thereby causing difficulties
In the high-tensile steel for automobiles, etc., there are many steel strips with a thickness of about 1.2 to 3.0mm. In particular, steel strips with a thickness of 1.2mm are weak in rigidity and fast in passing through the strip, so they are injected with a large amount of There is a risk of easy bouncing or curling up of the steel strip due to fluid resistance when passing it in the presence of cooling water

Method used

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  • Cooling method and cooling device for hot-rolled steel strip
  • Cooling method and cooling device for hot-rolled steel strip
  • Cooling method and cooling device for hot-rolled steel strip

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Embodiment

[0095] The embodiment of the present invention is explained.

[0096] In this embodiment, in figure 1 On the hot-rolled steel strip manufacturing production line, the billet with a plate thickness of 250mm is heated to 1200°C in the heating furnace 30, and then rolled into a plate thickness of 3.2mm and a plate width of 1200mm through the rough rolling mill 31 and the finishing mill 32. The device 33 is cooled, and the winding is performed by the winding machine 34. The temperature after the end of rolling and after the end of cooling was measured with a radiation thermometer 35. The temperature after rolling was 850°C, and the temperature after cooling was 550°C. Furthermore, the speed of the steel strip during cooling is 550 mpm.

[0097] Cooling device 33 such as figure 2 In that way, the upper surface is set as the tube laminar flow nozzle 3, and the lower surface is set as the spray cooling 4 of the present invention. The flow density of injection per unit area is 1000L / mi...

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Abstract

Provided are a cooling method and a cooling device for adjusting the volume of cooling water in two levels for each set of width direction headers when cooling a hot-rolled steel strip and for changing the steel strip cooling velocity in multiple levels using a simple method, the method and device being particularly effective for cooling the lower surface of a steel strip in a narrow space. Spray nozzles (5) are disposed in a row at a specified pitch in the width direction of the steel strip. In order that cooling water can be supplied from different piping systems for spray nozzles (5) that are adjacent in the width direction, the cooling headers (6) are configured so that: two systems are disposed per one set; a jetting valve (7) is installed on each; and individual cooling water jetting / stopping is possible.

Description

Technical field [0001] The present invention relates to a cooling method and a cooling device capable of adjusting the cooling rate of the hot-rolled steel strip in multiple stages when the hot-rolled steel strip is cooled by controlled cooling in a hot-rolled steel strip manufacturing line. Background technique [0002] Hot-rolled steel strip (hereinafter, also referred to as steel strip) is manufactured by rolling a heated billet to a target size. However, in this case, hot rolling (rough rolling, In the cooling device in the middle of finishing rolling or the cooling device after finishing rolling, cooling is performed by cooling water (water cooling). The purpose of the water cooling performed here is to thereby mainly control the precipitation and transformation structure of the steel strip, and adjust the material in such a way as to obtain the target strength and ductility. In particular, in the cooling after finishing rolling, it is important to control the temperature t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B45/02
CPCB21B45/0233B21B45/0218
Inventor 上冈悟史千叶岳伊吹和也饭岛庆次
Owner JFE STEEL CORP
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