Cooling device and cooling method for hot-rolled steel plate

A hot-rolled steel plate and cooling device technology, which is applied in the direction of workpiece cooling device, length measuring device, quenching device, etc., can solve the problem of insufficient cooling capacity to inhibit the growth of grain size, and achieve the effect of uniform cooling capacity and uniform cooling

Active Publication Date: 2022-01-14
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And, in this level of cooling, the cooling capacity is not enough to suppress the growth of the crystal grain size

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0164] Hot rolled steel sheets of 3mm thickness of 400 mpm ~ 600 mpm, and the plate width is 1200mm is hot. figure 1 The output side of the rolling frame F6 is provided with the cooling device 21 of the present embodiment. The cooling length is set to 1.2m and the nozzle column is set to 5 columns. The water volume density of the cooling water from the nozzles on the upper surface is set to 7m 3 / m 2 · Minute, the water volume density of the cooling water from the lower surface side is 10m 3 / m 2 ·minute. The inclination angle of the upper side guide is set to 12 degrees, and the inclination angle of the lower guide is set to 0 degrees, that is, the angle θ of the upper and lower guides is set to 12 degrees, and the rolling frame based on the coupling 34 The web angle of the hot rolled steel plate 10 after the F6 is set to θ / 2 angle, ie 6 degrees (reference Figure 9 . The type of the nozzle is set to a dense conical nozzle. The position of each nozzle and the expansion angle o...

Embodiment 2

[0175] Hot rolled steel sheets of 3mm thickness of 400 mpm ~ 600 mpm, and the plate width is 1200mm is hot. figure 1 The output side of the rolling frame F6 is provided with the cooling device 21 of the present embodiment. The cooling length is set to 1.2m and the nozzle column is set to 5 columns. The water volume density of the cooling water from the nozzles on the upper surface is set to 7m 3 / m 2 · Minute, the water volume density of the cooling water from the lower surface side is 10m 3 / m 2 ·minute. The inclination angle of the upper guide member is set to 12 degrees, and the inclination angle of the lower guide is set to 0 degrees, and the web is set as a tape angle of the hot rolled steel plate 10 after the rolling frame F6 next to the coupling 34. 0 degrees in rolling direction (refer to Figure 8 . The type of the nozzle is set to a dense conical nozzle. The position of each nozzle and the expansion angle of the nozzle jet (the injection angle of the nozzle) are shown i...

Embodiment 3

[0186] Hot rolled steel sheets of 3mm thickness of 400 mpm ~ 600 mpm, and the plate width is 1200mm is hot. figure 1 The output side of the rolling frame F6 is provided with the cooling device 21 of the present embodiment. The cooling length is set to 1.2m and the nozzle column is set to 5 columns. The water volume density of the cooling water from the nozzles on the upper surface is set to 7m 3 / m 2 · Minute, the water volume density of the cooling water from the lower surface side is 10m 3 / m 2 ·minute. The inclination angle of the upper side guide is set to 12 degrees, and the inclination angle of the lower guide is set to 0 degrees, that is, the angle θ of the upper and lower guides is set to 12 degrees, and the rolling frame based on the coupling 34 The web angle of the hot rolled steel plate 10 after the F6 is set as 6 degrees of the angle of the θ / 2 (see Figure 9 . The type of the nozzle is set to a long round nozzle. The position of each nozzle and the long diameter of...

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Abstract

A cooling device having a plurality of nozzles for spraying cooling water toward one or both of the upper and lower surfaces of a hot-rolled steel sheet just after being rolled by a rolling stand in a hot finishing mill, the nozzles being arranged on the upper and lower surfaces In the guide, or provided on the downstream side of the guide in a manner adjacent to the guide, the spraying distance of the nozzle is changed according to the position of the nozzle in the rolling direction, wherein the nozzle at the position where the spraying distance of the nozzle is the largest The spray angle is smaller than the spray angle of the nozzle at the position where the spray distance of the nozzle is the smallest, and the spray angle of the nozzle is the same or becomes smaller as the spray distance of the nozzle becomes larger.

Description

Technical field [0001] The present invention relates to a cooling device and a cooling method using a hot rolled steel sheet having a heat rolling machine including a plurality of racks, and more particularly to a cooling technique for material control when manufacturing high performance steel. Background technique [0002] In the manufacture of a hot-rolled steel sheet, the heating furnace is heated by heating in a continuous casting machine or the like, and a thick rolling mill is formed using a thick rolling mill (a thick rough billet). Next, the fine rolling machine is used. The steel sheet of the predetermined plate thickness is formed, and the steel sheet is further cooled to form a hot rolled steel sheet in a predetermined cooling mode. In the finishing mill, the plurality of rolled racks are arranged directly, and the coarse-rolled steel is passed through the plurality of rolling frames by sequentially passed. [0003] In the manufacture of hot rolled steel sheets, it is ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B21B45/02
CPCB21B45/02B21B45/0233C21D1/667C21D8/0263C21D9/573C21D9/5735C21D2211/00B21B45/0281B21B37/76B21B38/006B21B45/0218B21B2261/20
Inventor芹泽良洋村井隆公末松芳章林聪中尾智哉仁井谷洋
OwnerNIPPON STEEL CORP