JPH0839129A - Descaling device in hot rolling steel product - Google Patents

Abstract

PURPOSE:To prevent generation of edge drops and scabs by constituting a descaling device in such a manner that high-pressure water at the time of descaling is not concentrated to one edge of steel product. CONSTITUTION:This descaling device in hot rolling of the steel product is constituted to remove the scale on the surfaces of the steel product 4 by injecting the high-pressure water thereto in a direction approximately opposite to the progressing direction of the steel product. The twist angles with the progressing direction of the steel product of injection nozzles 3a, 3b mounted at a header 1 arranged in the transverse direction of the steel product are directed to the inner side with each other with the center in the transverse direction of the steel product as a border.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a descaling device for injecting high-pressure water onto a steel material to peel off and remove scale on the surface during hot rolling of the steel material.

[0002]

2. Description of the Related Art A descaling device for injecting high-pressure water onto a steel material is used in order to remove scales generated on the surface during hot rolling of the steel material. Figure 3 shows the actual Kaihei 4
-The descaling device described in Japanese Patent No. 75602,
Reference numeral 1 is a header, 3 is an injection nozzle, and 4 is a steel material.

Injection nozzle 3 in a descaling device
In order to prevent the scale from being caught in the downstream step, the scale is discharged to the outside of the steel material width in a direction substantially opposite to the traveling direction and at a twist angle c with respect to the traveling direction.
Although it is attached to the header 1 by providing (for example, 15 °), it is usual that the plurality of injection nozzles 3 are attached in the same direction as shown in this figure.

When all of the jet nozzles 3 are attached by twisting in the same direction in this way, the scale is discharged well, but high-pressure water gathers at the edge of one side, so the temperature of the steel material on that side drops. However, for example, if the downstream is a finish rolling mill, there is a problem that an edge having a low temperature is transformed and an edge drop occurs. Further, if the downstream is a rough rolling mill, there is a problem that a mountain-shaped or scaly peeling called "scab" occurs at an edge having a low temperature.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a descaling device which prevents high-pressure water during descaling from concentrating on the edge portion of a steel material, particularly on one edge portion. The purpose is to provide.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a descaling device in hot rolling of a steel product, in which high-pressure water is jetted to the steel product in a direction substantially opposite to the traveling direction to remove scale on the surface, in a width direction of the steel product. A descaling device in hot rolling of steel products, characterized in that the twist angle of the injection nozzle attached to the arranged header with respect to the traveling direction of the steel products is such that they are directed inward with respect to the widthwise center of the steel product. Preferably, the header is divided into two parts in the width direction of the steel material, and the header is arranged so as to be shifted forward and backward with respect to the traveling direction of the steel material, or the nozzle in the width direction center of the steel material is provided with a helix angle with respect to the steel material traveling direction. And a descaling device in the hot rolling of the above steel material, which is attached to the header while being shifted to the downstream side.

[0007]

[Operation] According to the present invention, since the header is divided into two in the width direction and the nozzles are directed inward for each division unit, the cooling state of both edges is the same, and only one edge is cooled. Is not overcooled,
The occurrence of edge drops and baldness was reduced and both sides were equalized.

[0008]

【Example】

Example 1 A first example of the present invention is shown in FIG. Reference numerals 1a and 1b are headers divided into two in the width direction of the steel material 4, and each of the headers 1a and 1b has a plurality of injection nozzles 3 in a direction substantially opposite to the traveling direction of the steel material 4 as in the case of FIG. , And is attached at a helix angle c with respect to the traveling direction, the injection nozzle 3a is in the lower left direction in the header 1a on the right side of FIG. 1, and the injection nozzle 3b is in the lower right direction in the left header 1b. They are attached to each other in the opposite directions by the width directions of 4 at an angle so as to face inward.

As each of the jet nozzles 3a and 3b, a flat nozzle in which the spread shape of the jetted water is flat or an elliptical nozzle is preferable. Since the headers 1a, 1b and the nozzles 3 are configured as described above, the injected water is concentrated in the widthwise central portion of the steel material, supercooling of the edge portion is prevented, and edge drop and baldness are suppressed. To be done. In addition,
The headers 1a and 1b are arranged slightly offset in the front-back direction with respect to the traveling direction of the steel material so that the sprayed water does not interfere with the descaling performance at the center portion in the width direction of the steel material.

Second Embodiment A second embodiment of the present invention is shown in FIG. Header 1 is steel 4
Although it is not divided in the width direction of the
3b are attached to the inside of each other in the opposite directions depending on the width direction of the steel material 4. Furthermore, the nozzle 3c at the center in the width direction does not have a helix angle, and in the width direction center portion of the steel material, so that the injected water does not interfere with the descaling performance, the other nozzles 3a, 3b It is attached to the header slightly offset downstream.

The jet nozzles 3 are preferably flat nozzles or elliptical nozzles in which the spread shape of the jetted water is flat.

[0012]

According to the present invention, the cooling conditions of both edges are the same, and only one edge is not excessively cooled, so that the occurrence of edge drops and dents is reduced and both sides are equalized. It has the excellent effect of being performed.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a plan view showing a second embodiment of the present invention.

FIG. 3 is a plan view showing a conventional technique.

[Explanation of symbols]

 1, 1a, 1b Header 3, 3a, 3b, 3c Injection nozzle 4 Steel material

Front page continuation (72) Inventor Akihiko Takeya 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Co., Ltd. Steel Development & Production Division Chiba Steel Works

Claims (3)

[Claims] 1. A descaling device in hot rolling of a steel material, in which high-pressure water is jetted to the steel material (4) in a direction substantially opposite to the traveling direction to remove scale on the surface, the device is arranged in the width direction of the steel material (4). The twist angle of the injection nozzle (3a, 3b) attached to the header (1) with respect to the traveling direction of the steel material is
A descaling device for hot rolling of steel products, characterized in that the angles are set so as to face each other with the center of the steel product in the width direction as a boundary. 2. The descaling in hot rolling of steel material according to claim 1, wherein the header (1a, 1b) is divided into two in the width direction of the steel material, and the header (1a, 1b) is arranged so as to be shifted forward and backward with respect to the traveling direction of the steel material (4). apparatus. 3. The heat of the steel product according to claim 1, wherein the nozzle (3c) at the center of the steel product in the width direction is attached to the header (1) without being provided with a helix angle with respect to the traveling direction of the steel product and shifted toward the downstream side. Descaling device for hot rolling.