JPH05337535A - Bending controlling method for h-shapes by cooling flange - Google Patents

Abstract

PURPOSE:To facilitate controlling the shape and quality of H-shapes by uniforming the temperature in the transverse direction of flange. CONSTITUTION:When the flange of the rolled H-shapes 1 is water cooled, many water cooling nozzles 4 are arranged in the transverse direction of the flange 3 in multiple stages and plural cooling zones in multiplex arrangement are transverse in the transferring direction of the H-shapes 1. A fixed flow rate of cooling water supply by injection at each stage of each cooling zone is ON- OFF controlled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention proposes a method and an apparatus for controlling the bending of H-section steel without material deterioration due to flange water cooling of H-section steel which has been rolled on a roller table for conveyance of a rolling line. It is a thing.

As shown in FIG. 1, the cross section of H-section steel is such that the thickness of the flange 3 is thicker than the thickness of the web 2, and the heat capacity is different due to this difference in thickness, and the cooling process However, since the web 2 cools earlier than the flange 3, there is a temperature difference between the two, and even if attention is paid to the flange width direction, the temperature at the center of the flange and the temperatures at the upper and lower ends are different due to the structure and rolling conditions. come. When such a temperature difference occurs, shape defects such as web waves and bending due to thermal stress occur. Therefore, in order to prevent the occurrence of the defective shape, it is important to reduce the temperature difference between the respective parts without deteriorating the material due to water cooling of the flange part.

[0003]

2. Description of the Related Art Many means have been proposed and disclosed for flange cooling of H-section steel. For example,

Japanese Patent Publication No. 41-20336 discloses a side guide equipped with a flange water cooling device for H-section steel at a position corresponding to the center of the flange width of a side guide for guiding a material to be rolled to a rolling mill. As shown in FIG. 1, the cooling water nozzle 4 is installed. Cooling with this device reduces the temperature difference between the web and the flange by jetting cooling water toward the center of the flange where the temperature is highest. It is difficult to control the temperature distribution to be uniform.

Japanese Patent Publication No. 60-37856 discloses a method for producing H-section steel without web waves, in which the web wave evaluation index is represented by a functional expression to finish the flange and the web which are the target web wave evaluation index. A method is disclosed in which the temperature is obtained and the temperature of at least one of the heat retention of the web and the water cooling of the flange is adjusted so as to reach this temperature. In the case of performing flange water cooling by this method, an explanatory view of the flange water cooling of the H-section steel by this method is shown in FIG. 2. A plurality of stages of water cooling nozzles 4 are arranged in the flange width direction, and the flange 3 is water cooled by these. However, although there is an effect of preventing the generation of web waves, it is difficult to control the temperature distribution in the flange width direction to be uniform because the amount of water sprayed from the cooling water nozzles at each stage cannot be adjusted, and No mention is made of this matter.

Japanese Patent Publication No. 50-21913 discloses, as a flange water cooling device for H-section steel, a cross-sectional view 3 (a) and a perspective view 3 (b) thereof. For cooling with this water cooling device, a plurality of horizontal blades 7 are arranged in layers on the surface of the water cooling box 6 connected to the cooling water supply main pipe 5 facing the flange surface of the H-shaped steel 1, and cooling is performed through this water cooling blade 7. The water is a laminar flow in the horizontal direction, and the chilled cooling water is supplied toward the center of the flange width of the H-section steel 1, but the cooling water hits only downward from the center of the flange width direction. It is difficult to control the temperature distribution in the flange width direction to be uniform.

Japanese Unexamined Patent Publication No. 50-21914 discloses a perspective view 4 of an H-shaped steel flange water cooling device. For cooling with this water cooling device, a water sprinkling pipe 8 is provided above the H-section steel 1, and a heat insulation for the web portion and a cooling water sprinkling cover 9 are attached to the lower part of the H-section steel 1, and the cooling water is fed from above to the entire flange surface. However, it is not possible to control the temperature distribution in the flange width direction to be uniform by only flowing the cooling water.

The above disclosed example of flange water cooling is effective as a means for preventing the generation of web waves, but is not suitable as a means for preventing bending. By the way, the H-section steel being rolled or rolled has an uneven temperature distribution in the flange width direction. As an example, FIG. 5 shows the temperature distribution of the rolled H-section steel. As is clear from this figure, the temperature of the flange is naturally higher than that of the web. The temperature at the center is the highest, and the temperatures at the lower and upper ends are 30 ° C higher. Then, if a temperature difference occurs in the flange width direction,
As shown in FIGS. 6 (a) and 6 (b), thermal stress causes shape defects such as upward bending or downward bending in the H-section steel. Here, FIG. 6 (a) is an explanatory view showing the upward bending of the H-section steel, and FIG.
FIG. 4 is an explanatory view showing the downward bending of H-section steel.

As means for preventing the above-mentioned shape defects such as upward bending and downward bending, for example, Japanese Patent Application Laid-Open No. 52-104447 discloses a method for producing an H-shaped steel, and Japanese Patent Application Laid-Open No. 52-104450 describes H. Shaped steel cooling device, JP-A-52-14
Japanese Unexamined Patent Publication No. 53-43008 discloses an H-section cooling device for H-section steel, and JP-A-53-43008 discloses an H-section water cooling system. These are, as an example, an explanatory view showing a cooling method for the outer surface of the lower flange in FIG. 7 (a) and an explanatory view showing a cooling method for the inner surface of the lower flange in FIG. 7 (b). It is cooled by jetting and supplying cooling water from the nozzle 4, and mainly the inner surface thereof is cooled.

In order to make the temperature uniform in the width direction of the flange by these means, the cooling rate is restricted to the air cooling rate of the upper half of the flange. Therefore, not only does it take a long time to cool the flange, but the web with a small heat capacity cools before the flange, so the temperature difference between the web and the flange eventually becomes large, and shape defects such as web waves occur. If half is cooled too much, the temperature difference between the upper and lower flanges becomes large, and there is a problem that a defective shape due to bending occurs.

Japanese Patent Publication No. 56-80324 discloses a method of preventing vertical bending of H-section steel by water cooling. In this method, the cooling water nozzle 4 is moved in the flange width direction to cool the outer surface of the flange as shown in an explanatory view of the water cooling nozzle in FIG. Since the width of the jet water collision area in the vertical direction (flange width direction) is restricted by the rolled material having the smallest flange width, cooling is insufficient for the rolled material having a large flange width. That is, it becomes difficult to respond appropriately to the size change of the H-section steel.

[0012]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems in an advantageous manner. Cooling is performed to make the temperature distribution in the flange width direction uniform, and not only the web wave but also the vertical bending. An object of the present invention is to propose a method and an apparatus for controlling the bending of H-section steel by flange water cooling, which does not cause shape defects and material defects.

[0013]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a large number of cooling water nozzles in multiple stages in the flange width direction in the flange water cooling of rolled H-section steel and to provide multiple cooling water nozzles in the feed direction of the H-section steel. Multiple cooling zones arranged in series are arranged along the feed direction of the H-shaped steel, and in each cooling zone, a fixed flow rate of cooling water injection supply for each arrangement stage is turned on / off through nozzle arrangements. A method for controlling the bending of a H-section steel by water cooling of a flange, characterized in that the temperature distribution in the flange width direction is controlled to be uniform.

In the cooling zone, the widthwise distribution of the surface temperature of the H-section steel flange portion is measured at least at the leading side of the cooling zone in the arrangement order, and based on the measurement result, the arrangement order is arranged in a later order. On / off control of cooling water injection supply in the cooling zone,

Further, in a flanged water cooling device for H-shaped steel that has been rolled, a plurality of cooling water nozzles are arranged in multiple stages in the flange width direction, and multiple cooling zones are arranged in the H-shaped steel feeding direction, A plurality of bases are arranged along the feed direction of the H-section steel so as to face both outer surfaces of the flange, and in each cooling zone,
It is a bending control device for H-section steel by flange water cooling, which is provided with an on / off control mechanism for each placement stage through a series of nozzles.

In the cooling zone, a thermometer for measuring the widthwise distribution of the surface temperature of the H-shaped steel flange portion is provided at least on the cooling zone exit side at the leading side of the arrangement order.

Here, the H-shaped steel that has undergone rolling means the material to be rolled that has undergone rough rolling and finish rolling, and the cooling in this invention is mainly performed during the period from rough rolling to finish rolling and to the conveying rollers after finish rolling. It is done on the table.

[0018]

The present invention will be described in detail with reference to the drawings.
As an example applicable to the present invention, FIG. 9 shows an arrangement drawing of each cooling zone in the rolling line, and FIG. 10 shows the arrangement of cooling water nozzles in the cooling zones A and B (water cooling) in FIG. FIG. 11 shows an explanatory view of the area, and FIG. 11 shows an arrangement of cooling water nozzles in the cooling zones D to K (water cooling) in FIG. 9 and an explanatory view of the jet water collision area.

In FIG. 9, cooling zones A and B (water cooling) are arranged on the outlet side of the UR ₂ rolling mill 16 along the feed direction of the H-section steel, and in these cooling zones A and B, a large number of cooling waters are provided. Nozzles are arranged in a row in the flange width direction, and these cooling water nozzles have a mechanism that can move in the flange width direction of H-section steel, and injects cooling water toward the center of the flange width direction as is generally done. It is supplied and subjected to flange water cooling in advance in order to reduce the temperature difference between the H-section steel web and the flange. Then, by cooling in the cooling zone C (air cooling), the heat recovery of the surface of the H-section steel flange rapidly cooled by water cooling is measured.

After that, a large number of cooling water nozzles, which are the features of the present invention, are arranged in multiple stages in the flange width direction, and multiple cooling water nozzles are arranged in the H-shaped steel feed direction in a continuous manner (5 in FIG. 9).
m) cooling zones D to G and H to K are arranged on the inlet side and the outlet side of the UF rolling mill 17 along the feed direction of the H-section steel, respectively.
In each of these cooling zones, a constant flow rate of cooling water injection supply is turned on for each arrangement stage through nozzle arrangement stations.
By performing the off control and cooling the flange with water, the temperature distribution in the flange width direction can be made uniform, and finally the bending of the H-section steel (product) can be controlled. Note that the above also reduces the temperature difference between the web and the flange, prevents the generation of web waves, and makes it possible to obtain an H-section steel having a good shape.

Further, in the present invention, a thermometer is installed at least on the outlet side of the cooling zone on the front side of the arrangement order, and the thermometer is arranged based on the measurement result of the widthwise distribution of the surface temperature of the flange portion of the H-section steel. The cooling water temperature is controlled more accurately by controlling the on / off control of the cooling water injection supply for each nozzle arrangement stage in the cooling zone of the later order, and by doing so, a more reliable H type The steel bend can be controlled, and martensite may be generated on the cooling surface by rapid cooling in the water cooling process of the flange, but it is also effective in preventing this martensite generation, and to obtain an H-section steel without material deterioration. You can

Here, in FIG. 8, 14 is a UR ₁ rolling mill,
15 is an edger, L is an inlet side water cooling zone of the UR ₁ rolling mill 14,
M is the outlet side water cooling zone of the UR ₂ rolling mill 16, and the number above indicates the length (m) of each cooling zone.

The water cooling nozzles in the cooling zones A and B are shown in FIG.
As shown in Fig. 10, a plurality of cooling water nozzles are arranged in a row in the flange width direction of the H-section steel to form 10 rows along the feed direction of the H-section steel.
The water cooling nozzles are arranged at 0 mm pitch, and the widths of the jet water collision area in the flange width direction are alternately 150 mm and 100 mm. The width of the water spray collision area in the H-section steel feed direction is 50 mm.

As described above, in the cooling zones A and B, the water cooling nozzles having different jet water collision areas are arranged in the flange width direction, and in addition, the cooling zones A and B are movable in the flange width direction as described above. The size of H-section steel can be changed.

Next, in the water cooling nozzles of the cooling zones D to K, as shown in FIG. 11, a plurality of cooling water nozzles are arranged in five stages of 50 mm pitch in the width direction of the H-shaped steel flange, and the H-shaped steel is fed. Forty-nine stations are arranged at 100 mm pitch along the direction, and the jet water collision area of each cooling water nozzle is 50 mm in both the feed direction of the H-section steel and the flange width direction.

When the cooling water nozzles are arranged in multiple stages in the flange width direction and water cooling is performed, in order to make the cooling ability uniform in the flange width direction, injection is performed for each nozzle placement stage in consideration of the influence of the flowing water. The amount of water needs to be adjusted, but Fig. 11
As shown in Fig. 7, by making the jet water collision areas from the cooling water nozzles adjacent to each other in the flange width direction (vertical direction) close to each other, the influence of the spillage water becomes small, and the cooling water flow rate at each stage is kept constant. However, the cooling capacity in the flange width direction is almost constant.

Further, FIG. 12 shows an explanatory view of the arrangement state of the H-section steel and the water cooling nozzle in the cooling zones D to K.
In each of the cooling zones D to K, as shown in FIG. 12, a large number of cooling water nozzles 4 are attached to the water supply pipes 13 arranged in five stages in the flange width direction, and a constant flow rate of cooling water is supplied to each water supply pipe 13. It is possible to control the ON / OFF of the cooling water injection supply while supplying the cooling water and keeping the collision force constant. A guide water slit 12 is provided in the guide 11 between the cooling water nozzle 4 and the H-shaped steel flange 3 so that the cooling water collides with the flange 3 through these slits 12. There is. In the figure, 10 is a conveying roller.

Next, when water-cooling the H-section steel having a flange width of 300 mm in the water cooling zones D to K, when the cooling water is jetted and supplied over the entire width, and in order to make the temperature uniform in the flange width direction, A case where the injection supply of cooling water is stopped is described.

FIG. 13 shows an explanatory view of a case where an H-section steel flange having a flange width of 300 mm is jetted and supplied over the entire width thereof. In this case, as shown in the figure, there are 5 steps in the flange width direction. Cooling water is jetted and supplied toward the flange 3 from the cooling water nozzles 4 at the stage where all nozzles are arranged.

On the other hand, the temperature distribution in the width direction of the flange of the rolled material to be cooled is different in the width direction as shown in FIG. 5, and the lower end is higher at the upper and lower ends. Therefore, it is important to reduce this temperature difference, and for this purpose, it is important to intensively cool the lower part of the flange. In this case, this is dealt with by stopping the injection supply of the cooling water from the cooling water nozzle at the stage where the nozzles corresponding to the upper part of the flange are arranged. An example is H with a flange width of 300 mm.
FIG. 14 shows an explanatory diagram in the case where the injection supply of the cooling water from the cooling water nozzle corresponding to the upper portion of the section steel in the flange width direction is stopped. As shown in this figure, the cooling water injection supply from the upper two cooling water nozzles 4 is stopped, and only the cooling water injection supply from the lower three cooling water nozzles 4 is performed, and the center of the flange 3 in the width direction and below it. Water cooling.

Further, FIG. 15 shows an explanatory view of the case where an H-shaped steel flange having a flange width of 200 mm is jetted and supplied with cooling water over its entire width. In this case, as shown in the drawing, by stopping the injection supply of the cooling water from the cooling water nozzles 4 in the upper two stages, the cooling water does not scatter on the H-section steel web, and the entire width of the flange 3 in the width direction is prevented. Cooling water can be injected and supplied. In the above case, when water cooling is performed on the central portion and the lower portion in the flange width direction, cooling water may be jetted and supplied from the cooling water nozzles 4 in the lower one or two stages.

As described above, by arranging the cooling water nozzles in multiple stages in the flange width direction of the H-section steel, it is possible to cope with changes in the flange width of the H-section steel and to inject the cooling water for each arrangement stage of each nozzle. By controlling the supply on / off, the temperature difference between the upper and lower ends in the flange width direction can be reduced.

Furthermore, as described above, in the water cooling process of the flange, martensite may be generated on the cooling surface by rapid cooling, but each water cooling zone is divided into, for example, every 5 m to control the surface temperature. When the surface temperature of the water-cooling surface on the outlet side of the water-cooling zone becomes 450 ° C or lower, the cooling water should be injected and supplied from the nozzle arrangement stage corresponding to the position at which it becomes 450 ° C or lower in the subsequent water-cooling zone. By stopping, generation of martensite can be prevented.

[0034]

[Experimental Results and Examples] Experimental results and examples conducted in a rolling line having the cooling zone shown in FIG. 9 will be described below.

Applicable example and comparative example for H-section steel with a flange width of 250 mm Steel type: SM490A (C: 0.15 wt%, Si: 0.3 wt%, Mn: 1.37
wt%, P: 0.022 wt%) size 600 × 25
In manufacturing 0 × 12 × 28 H-section steel, the flange water temperature during rolling and after rolling was changed, and the flange surface temperature during the process and the bending of the H-section steel (product) were investigated. These results are described below.

First, FIG. 16 shows the temperatures of the web and flange of the material to be cooled after rough rolling. As is clear from this figure, the temperature at the center position of the flange width (hereinafter simply referred to as F1 / 2) is the highest, and the position 1/4 of the total width from the upper end of the flange width (hereinafter simply referred to as F1 / 4) and the flange width upper end. From the position of 3/4 to the full width (hereinafter simply referred to as F3 / 4), F3 /
4 is 13 ℃ higher.

The material to be cooled after such rough rolling is cooled in cooling zones A to G, subjected to finish rolling, and further cooled in cooling zones H to K. The cooling conditions are: When cooling water is evenly injected and supplied (Comparative example), and when cooling water injection and supply at some nozzle placement stages of some cooling zones is stopped to reduce the temperature difference in the flange width direction (Compatible example) ) Two conditions. These cooling conditions and flange surface temperature difference (F1 /
4-F3 / 4) is shown in FIG. 17 (comparative example) and FIG. 18 (conforming example).

Here, in these figures, the cooling conditions are
When cooling water is injected and supplied for each cooling zone nozzle placement stage, the solid line is shown in the column of the relevant cooling zone nozzle placement stage, and when cooling water injection supply is stopped I left it blank. In the cooling zones A and B, the long solid line indicates that the width of the jet water collision area in the flange width direction is 150 m.
m water cooling nozzle, short solid line shows the case of using 100 mm water cooling nozzle. Note that FIG. 19 and FIG.
The same display as above was displayed.

From these FIGS. 17 and 18, the surface temperature difference (F
1 / 4-F3 / 4) is a little less than 20 ° C. on the exit side of the final cooling zone K in FIG. 17 (comparative example), but in FIG. The influence of stopping the injection supply of the cooling water in the fourth stage of the arrangement stage of
On the outlet side, the value is already close to 0 ° C., and thereafter on the outlet side of the final cooling zone K, the value is close to 0 ° C.

The bending of the H-section steel obtained by these is 12 mm per 10 m in the case of FIG. 17 (comparative example) and 4 mm per 10 m in the case of FIG. 18 (conforming example), and the effect of the present invention is remarkable. It is shown that.

[0041] Determination of conditions under which H-shaped steel with a flange width of 200 mm does not produce mantensite by water cooling Steel type: SM490A as a raw material for manufacturing H-shaped steel of size 550 x 200 x 6 x 16 during rolling and rolling The subsequent flange cooling conditions were changed to determine water cooling conditions without martensite formation. These cooling conditions are shown in Fig. 19, and
Table 1 shows the results of investigations on the web wave generation index, the amount of bending, the web residual stress, the presence or absence of martensite formation, and the like.

[0042]

[Table 1]

Here, the web wave generation index is calculated by the ratio of the average compressive stress σ _W bar of the web and the critical buckling stress σ _cr , and if the web wave generation index is 0.6 or less, the web wave is generated. It never happens.

From FIG. 19 and Table 1, under cooling condition 1, martensite has already formed on the outlet side of cooling zone B, under cooling condition 2, martensite has formed on the outlet side of cooling zone F, and under cooling condition 3. No martensite was produced, but the bend was large, and by using the cooling condition 4 conforming to the present invention, no martensite was produced, and the cooling water in the third stage of the nozzles in the cooling zones D and F was arranged. Due to the effect of stopping the injection supply, an H-section steel without bending is obtained. Also, the web wave generation index of cooling condition 4 is 0.457.
And, of course, no web wave is generated.

In order to prevent the formation of martensite as in the cooling condition 4, the cooling condition can be easily determined by using the surface temperature distribution in the flange width direction on the outlet side of the cooling zone as an index as described above. Can be set.

Surface distribution in the flange width direction and plate thickness average temperature distribution in the water cooling process in the case of H-section steel with a flange width of 150 mm Roll H-section steel of size 550 × 150 × 6 × 16 using the material of steel type SM490A In this case, when the flange water cooling is performed under the cooling conditions shown in FIG. 20 as the conditions compatible with the present invention, the surface of the inlet side of the cooling zone A, the surface of the cooling zone C (air cooling), the outlet side of each of the G and the final K, and Flange width direction temperature distributions (positions of F1 / 4, F1 / 2, F3 / 4) of the average plate thickness are shown in FIG. 21 (surface temperature) and FIG. 22 (average plate thickness temperature), respectively.

As is clear from these figures, in the cooling zone G, the temperature of the flange width direction is made uniform by stopping the injection supply of the cooling water in the second stage of the nozzle arrangement. That is, F1 / 4 at the entrance side of the cooling zone A
The temperature difference between F3 / 4 and F3 / 4 is 21.3 ° C at the surface temperature and 2 at the average plate thickness
What was 2.6 ℃ was 1.3 ℃ and 0.6 ℃, respectively, on the exit side of the final cooling zone, and became very small.
The temperature difference between 3/4 and F1 / 2 is also decreasing.

As described above, according to the above cooling conditions, the temperature difference in the flange width direction can be reduced, and the bending of the H-section steel caused by the thermal stress caused by the temperature difference can be prevented.

[0049]

According to the present invention, cooling zones in which a large number of cooling water nozzles are arranged in multiple stages in the flange width direction of H-section steel after rolling are arranged in the feed direction of H-section steel, and are provided in each cooling zone. By controlling ON / OFF of the cooling water injection supply for each nozzle arrangement stage, it is possible to support cooling of multi-size H-section steel, and there is a temperature difference in the flange width direction.
By appropriately cooling the shaped steel and making the temperature uniform, it is possible to prevent the defective shape of the H shaped steel from occurring. Further, since the surface temperature of the H-section steel can be controlled and cooled, the occurrence of material defects can be prevented, and the flow rate of the cooling water from the arrangement stage of each nozzle can be kept constant, and the flowing water on the surface to be cooled can be kept constant. Since the cooling water is injected and supplied with little influence, the vertical cooling capacity on the cooling surface is maintained constant and uniform cooling can be performed without complicated adjustment of the cooling water flow rate. It is possible to easily control the shape of steel.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a cross section of an H-section steel and a flange water cooling of a conventional example.

FIG. 2 is an explanatory diagram showing a conventional example of flange water cooling.

FIG. 3 (a) is a transverse cross-sectional view of a conventional flange water cooling device. (b) is a perspective view of a conventional flange water cooling device.

FIG. 4 is a perspective view of a conventional flange water cooling device.

FIG. 5 is a graph showing the temperature distribution of rolled H-section steel.

FIG. 6 (a) is an explanatory view showing an upper bend of an H-section steel.
(b) is explanatory drawing which shows the downward bending of H-section steel.

FIG. 7A is an explanatory view showing a cooling method for the outer surface of the lower flange of the conventional example. (b) is an explanatory view showing a cooling method of the inner surface of the lower flange of the conventional example.

FIG. 8 is an explanatory diagram showing a conventional water cooling nozzle.

FIG. 9 is an arrangement drawing of each cooling zone in the rolling line according to the present invention.

10 is an explanatory diagram showing the arrangement of cooling water nozzles in cooling zones A and B in FIG. 9 and the jet water collision area thereof.

11 is an explanatory view showing the arrangement of cooling water nozzles in cooling zones D to K in FIG. 9 and the jet water collision area.

12 is an explanatory diagram showing an arrangement state of H-section steels and water cooling nozzles in cooling zones D to K of FIG.

FIG. 13 is an explanatory diagram of a case where a H-shaped steel flange having a flange width of 300 mm is jetted and supplied with cooling water over its entire width.

FIG. 14 is an explanatory diagram in the case where the injection supply of the cooling water from the cooling water nozzle of the nozzle arrangement stage corresponding to the upper portion in the flange width direction of the H-section steel having the flange width of 300 mm is stopped.

FIG. 15 is an explanatory view of a case where an H-section steel flange having a flange width of 200 mm is jetted and supplied with cooling water over its entire width.

FIG. 16 is an explanatory diagram showing temperatures of a web and a flange after rough rolling.

FIG. 17 is a graph showing a cooling condition (comparative example) and a flange surface temperature difference (F1 / 4-F3 / 4) in a cooling process.

FIG. 18 is a graph showing a cooling condition (adapted example) and a flange surface temperature difference (F1 / 4-F3 / 4) in the cooling process.

FIG. 19 is a graph showing flange cooling conditions for H-section steel with a flange width of 200 mm.

FIG. 20 is a graph showing cooling conditions for H-section steel with a flange width of 150 mm.

FIG. 21 is a graph showing a surface temperature distribution in the flange width direction during a cooling process.

FIG. 22 is a graph showing a plate thickness average temperature distribution in the flange width direction during a cooling process.

[Explanation of symbols]

1 H-shaped steel 2 Web 3 Flange 4 Cooling water nozzle 5 Cooling water supply main 6 Water cooling box 7 Horizontal blade 8 Sprinkling pipe 9 Cover 10 Conveying roller 11 Guide 12 Slit 13 Water supply pipe 14 UR ₁ Rolling mill 15 Edger 16 UR ₂ Rolling mill 17 UF Rolling mill A to M Cooling zone

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Tsuneo Seto 1-chome, Mizushima Kawasaki-dori, Kurashiki-shi, Okayama Prefecture (without street number) Inside the Mizushima Works, Kawasaki Steel Co., Ltd. (72) Yoji Fujimoto 1-shima-shima Kawasaki, Kurashiki-shi, Okayama Prefecture Chome (no street number) Kawasaki Steel Co., Ltd. Mizushima Steel Works (72) Inventor Hiroshi Yoshida 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba Kawasaki Steel Co., Ltd.

Claims (4)

[Claims] 1. At the time of flange water cooling of rolled H-section steel, a large number of cooling water nozzles are arranged in multiple stages in the flange width direction,
Multiple cooling zones are arranged in the feed direction of the H-section steel
A plurality of bases are arranged along the feed direction of the shaped steel, and in each cooling zone, the nozzles are connected to each other to control ON / OFF of the cooling water injection supply at a constant flow rate for each arrangement stage, and the temperature in the flange width direction is controlled. A method for controlling bending of H-section steel by water cooling of a flange, characterized by making the distribution uniform. 2. A distribution in the width direction of the surface temperature of the H-section steel flange portion is measured at least at the cooling zone exit side in the leading side of the arrangement order, and based on the measurement result, in the cooling zone in the later order in the arrangement order. The method for controlling the bending of the H-section steel by flange water cooling according to claim 1, wherein the cooling water injection supply is controlled to be turned on / off. 3. A flanged water cooling device for rolled H-section steel, comprising a plurality of cooling water nozzles arranged in multiple stages in the flange width direction,
A plurality of cooling zones arranged in the H-section steel feed direction are arranged along the H-section steel feed direction so as to face both outer surfaces of the flange, and nozzles are arranged in each cooling zone. A bend control device for H-section steel by flange water cooling, which is equipped with an on / off control mechanism for each arrangement stage through a series. 4. The H-shaped flange by water cooling according to claim 3, wherein a thermometer for measuring the widthwise distribution of the surface temperature of the H-shaped steel flange portion is provided at least on the outlet side of the cooling zone on the leading side of the arrangement order. Steel bend control device.