Cooling method for hot-rolled sheet steel

A technology of hot-rolled steel sheet and cooling method, applied in workpiece cooling device, driving device for metal rolling mill, metal rolling, etc., to achieve the effect of suppressing uneven cooling, suppressing deviation, and suppressing the temperature of coiled steel plate

Active Publication Date: 2014-08-06
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, there is known a cooling method that eliminates as much as possible the cooling in the transient boiling state that is the main cause of cooling unevenness from the viewpoint of ensuring cooling uniformity, and utilizes the nucleate boiling state that can obtain stable cooling capacity. cooling, but generally the cooling in the state of nucleate boiling becomes rapid cooling

Method used

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  • Cooling method for hot-rolled sheet steel
  • Cooling method for hot-rolled sheet steel
  • Cooling method for hot-rolled sheet steel

Examples

Experimental program
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Effect test

Embodiment

[0076] Hereinafter, Examples A1 to A7, Examples B1 to B7, Examples C1 to C7, and Examples D1 to D7 performed using the finish rolling mill, the first cooler, the second cooler, and the coiler will be described.

[0077] In various embodiments, based on Figure 7 In the transfer speed change schedule shown, the finish rolling of the hot-rolled steel sheet was performed, and then the first cooling and the second cooling were performed. Table 1 shows respective cooling conditions and evaluation results. exist Figure 7 Among them, t=0 is the time when the front end of the hot-rolled steel sheet reaches the first cooling zone, and t=90 is the time when the rear end of the hot-rolled steel sheet reaches the coiler. In this example, evaluation was performed by setting the conveyance speed at t=20 as the first conveyance speed and the conveyance speed at t=50 as the second conveyance speed. In addition, the outlet-side target steel plate temperature in the second cooling section w...

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Abstract

The present invention provides a method for cooling a hot-rolled steel sheet after finish rolling accompanied by a change in conveying speed, comprising: a step of setting a schedule for changing the conveying speed according to the temperature of the steel sheet before the above-mentioned finish rolling and the conditions of the above-mentioned finish rolling; In the first cooling zone, the process of cooling the first cooling of the above-mentioned hot-rolled steel sheet in a film boiling state is carried out; a step; and a step of coiling the hot-rolled steel sheet; controlling the cooling condition in the first cooling so as to satisfy 0.8≦(T2a′-T2a) / ΔTx≦1.2.

Description

technical field [0001] The invention relates to a cooling method of a hot-rolled steel plate. [0002] This application is based on Japanese Patent Application No. 2009-285121 for which it applied in Japan on December 16, 2009, and the priority is claimed, and the content of this earlier application is used here. Background technique [0003] The hot-rolled steel sheet after the finish rolling step in the hot rolling process (hereinafter sometimes referred to as "steel sheet") passes through a cooling device having a plurality of cooling machines while being transported from the finish rolling mill to the coiler (down coiler) After cooling to the specified steel plate temperature, it is coiled by a coiler. In the hot rolling of the steel sheet, the state of cooling from the finish rolling step to the coiling is an important factor for determining the mechanical properties of the steel sheet. As a cooling medium, for example, water (hereinafter sometimes referred to as "coo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B45/02B21B1/26B21B37/00B21B37/76
CPCB21B45/0218B21B38/006B21B1/26B21B2275/06B21B37/76B21B37/00B21B45/02
Inventor 吉居功菱沼纪行古河嘉之石原理
Owner NIPPON STEEL CORP
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