JPS58163519A - Steel plate cooling device - Google Patents

Abstract

PURPOSE:To obtain an economical device, by forming an upper pipe laminer header by alternately arraying pipe laminar headers of a small diameter and a large diameter, and forming a lower spray header by alternately arraying spray headers of a small capacity type and a large capacity type. CONSTITUTION:To a steel plate to be cooled, which is made to pass through in one direction after finish rolling or hot leveling, an upper pipe laminer header and a lower spray header are made to correspond, and cooling is executed. The upper pipe laminer header is constituted of such two kinds as an upper pipe laminer header 3 for weak cooling to the small diameter side and a strong cooling pipe laminar header 4 of the large diameter side, and the weak cooling header 3 and the strong cooling header 4 are arrayed alternately in each due order in the plate passing direction. Also, on the lower part between carrying rolls 7-, a weak cooling sprary header 8 and a strong cooling spray header 9 are arrayed orthogonally in each due order in the plate passing direction, and in each lengthwise direction, a weak cooling spray nozzle 10 and a strong cooling spray nozzle 11 are arrayed.

Description

[Detailed description of the invention] We will improve this steel plate cooling system.

The method for cooling steel plates during finishing rolling and rolling is accelerated water cooling.
In this accelerated water cooling equipment, the upper pipe header and the lower spray header are placed above and below the plate, and forced cooling is applied through the respective nozzles, thereby effectively improving the steel sheet material. It is a known place. Facilities that adopt this accelerated water cooling method require that the water supply system and related equipment be configured accordingly to encourage accelerated cooling.According to the Ill. However, if you were to lay out a dedicated layout for 411, it would only be a problem due to space, but this is already
Compared to OW&I11, the amount of acid used is often limited due to space constraints in layout.

The accelerated water cooling method is based on the premise of large-scale problems, but in order to increase the depth of the material from IIIK-to, for example, when controlling the cooling of a steel plate with a thickness of 18 mm from aOO to 600℃, s'e7 ! When it reaches -48'C/0, it is necessary to control the average cooling moderately when the temperature reaches 0, and for this reason, as mentioned above, a pipera electric header is installed on the upper part of the steel plate and a spray header is installed on the lower part. However, in the current equipment, the upper and lower) Zuru are all a single type that is common to the upper and lower parts, respectively, so the problems with the layout will also be discussed below. It was causing problems.

That is, to briefly explain the current technical background, as a prerequisite example, for a cooling request from goo to soo 'C, the minimum cooling speed change of the steel plate ChlXM and the maximum cooling speed change C!
It is necessary to have a high ratio of CIA x A to I summer of 1.6 or more, and if this is to be achieved using exactly the same cooling equipment, the water density ratio at, as mentioned above, will be very high. It becomes necessary to control a wide range of 11, and in the case of 'e, for example, a txsm steel plate is
“c7ino” lol! SO”C71no (5100
It is necessary to control the cooling rate in the range (cooling condition to -4500℃), and to satisfy this, it is necessary to control the cooling rate in the range of approximately 0.1S to 0.64□button・d for the upper pipework, and approximately 0.30 for the lower spray. It is necessary to control the water density within the range of ~ta, gtd7tain・d. If all controls are to be handled by using the above-mentioned pipe laminar nozzle with common specifications and the same four spray nozzles with common specifications, the discharge pressure itself will have to be changed widely in response. There is no better solution than using intermittent cooling or thinning out by one plant.

More specifically, for example, in accordance with the lower spray pressure, a header with 56 spray nozzles arranged at sosw intervals and 8 headers arranged at 1J50 spacing with a discharge pressure of 4 k/d as a supply area is used. , the amount of water discharged at a force-pressure x
If a spray nozzle with the xo44 button specification is installed and is in good condition, a stable spray pattern will be produced at discharge pressures of 0, s or higher, so it can be used in a high water flow density range (0, 8
4-2. All headers can be used to control water flow (71nm), but between low water density and 1! (o, so
~o, 14 books-n-@') For PC, Part 1
1 If all headers are used, the discharge pressure will drop significantly and the water injection will become uneven, forcing so-called thinning of the header. It is unfortunate that we have no choice but to take measures to encourage the reduction of water volume density as a matter of value.

This also applies to the upper part/kuiputsuzusu, which also uses a common nozzle system. For example, under the condition of discharge pressure 0.1- or less, a header in which 60 pipera electric nanozzles are arranged at 16 inch intervals is 5Iy5HI1 interval. de1
The upper cooling equipment with 6 headers arranged in a high water flow density area l!
(About o, ss ~ o, a4j $in-m) Te equipment 0
To all: //l can be used, but lower water flow density WM (0,13~0.36td7hin-&)
Then, the lower side Kl? For the same reason, thinning is necessary for the same reason16, and intermittent cooling due to extremely thinning in such a low water density region results in non-uniformity of the material, resulting in accelerated cooling which cannot sufficiently improve the material quality. This would even lead to an essential compromise.

Considering this, for example, it is possible to target the low water flow density region as a criterion for selecting both the Sedge Rei and Noku Ipramina nozzles, but on the contrary, in the high water flow density region, the discharge pressure For example, in the lower spray side of the above example, -ji! , 11 If a 6Q17bin specification nozzle is selected with V1 discharge pressure, the maximum water flow density tv a
In order to obtain $ij 1% in-go, it is necessary to supply a very high discharge strength of about 85 or more.This is the same on the upper vibrator side, apart from a slight difference. I can say that. According to the equipment type, it is clear that this will result in a large capital investment for the water supply system and high operating costs, resulting in a considerable economic disadvantage. As a result, as the flow rate from the nozzle increases, it causes disadvantages such as a decrease in steel sheet cooling efficiency due to the relationship with the electric current.Therefore, it is necessary to effectively solve the above problem. This is the translation. □This invention has been made in view of these facts. Therefore, the features here are that the finish rolling or hot repeller 11K is passed in one direction by the wrinkle cooling δ steel 1[K and the upper bilaminar header. In a steel plate cooling device configured to provide cooling by matching the upper and lower play headers, a small-diameter piper header and a large-diameter pipe header header are arranged with electricity flowing back and forth in the sheet passing direction to form an upper bilayer C-header, The point is that the lower spray header is constructed by arranging the small-capacity Sugeray header and the large-capacity spray header alternately in the front direction of the sheet threading direction.
Below, illustrated lI*li! Explain an example.

Figure 1 is a plan view showing an example of the accelerated cooling equipment as a whole, where arrow P indicates the direction of threading, and ■ indicates the water supply system (detailed explanation of the piping system is omitted). The first puncture (1) t5 is in front of the direction.
In addition, a second puncture is formed at the rear stage, and this illustration is for the upper pipe lamina side, and even if there is a second puncture on the lower spray side, the first and second punctures are formed in the same way.

First, as a header for the upper pipe header @2 As shown in the figure, the upper pipe header (3) for weak cooling on the small diameter side,
There are two types of large-diameter side pipe fittings (114) for strong cooling, and among them, the first puncture (1) K is arranged perpendicularly to the threading direction as shown in the first diagram, with the first puncture (1) K shown in the second diagram as one set. However, a large number of sets for weak cooling (sets) and sets for strong cooling (4) are arranged alternately one after the other with respect to the mail order direction.

Each of these headers (31 (from 41, an inverted U-shaped Bi-Plat nanozzle (Il+1i) for weak cooling and a Pi-Gra ξ Nanozzle 1 for strong cooling) are symmetrical with the front wall and extend in the longitudinal direction of the header. In contrast to the first puncture (1), the second puncture (2) is arranged with a pipe power header (3) exclusively for weak cooling.

On the other hand, the mononoke shown in the black drawing, the conveyor (γ)...
... Kll cooling spray header (8) and the seven strong cooling spray headers (9) are arranged orthogonally in the sheet passing direction, with a weak cooling spray head in the longitudinal direction of each header (8). A large number of nozzles and strong cooling spray nozzles (11) are arranged.

This item No. 111 constitutes the drop 1 puncture for the lower spray, and the spray header for weak cooling (8
) only.

As shown in Table 1, this equipment with such a special arrangement is used for low flow density and high flow density layers in the upper pipe laminated layer and lower spray layer, respectively. For WIK between low water flow density of .26Wc/fa button/d, use the weak cooling piper ζna header (3) side exclusively, in this case, use the nozzle specifications Φ in the lower row of the table.
On the other hand, for high water flow density ranges of o, g to o, a, tn and d, the strong cooling pipera power header (4) side is exclusively used, and in this case, the nozzle specification O in the lower row of the table is selected. On the other hand, on the lower spray side, 0.36~o, asl1
In the low water density range of 6 in・d, use the weak cooling spray header (8) and adjust the nozzle specifications θ in the lower part of the on-spot payment table.
In the high water flow density range, use the strong cooling spray header (9) and select the nozzle specifications as shown in the table below.

Table 1 Examples of equipment specifications As shown in Figure 1, accelerated cooling is effectively utilized within the limited existing equipment space, and the results of this implementation are shown in Figure 4. .

In this case, the low flow rate density equipment is the one that uses the above-mentioned upper and lower nozzles (i) for weak cooling, and the high flow density equipment is the equipment that uses the upper and lower nozzles (1) for strong cooling. 11 is used.

As is clear from this diagram, if we take a m5m5 thickness 0 steel plate as an example, by effectively using both equipment step by step, Juku Steel &&
The cooling rate can be applied over a wide range of about 3.6 to 30''Q7m・0 without Il (as it can be obtained freely, in this case the ratio CM of the minimum water flow density Cmxy and the maximum water flow density ClAl)
The AXA ratio is approximately i, and we were able to obtain a wide range of cooling rate ratios (range S) of about 6.
! This was achieved by operating the weak cooling type and the strong cooling type alternately without using the cold cooling type. Considering the entire width direction, when thinning is used (
! ) and the case (without thinning according to this example), we were able to obtain expected results as an accelerated cooling method in which there was no variation in hardness in the width direction.

The present invention is as described above, and therefore, it is possible to provide a device that is extremely economical in terms of the above-mentioned equipment investment and operating costs, and can be laid out within the existing equipment space 2. In cooling with pipe lamina, it is possible to maintain the cooling efficiency at an appropriate value of K11m without causing disturbances in the current flow.
According to AK, it can bring about effective effects in various aspects.

[Brief explanation of the drawing]

FIG. 1 is an overall plan view showing an example of the equipment of this invention, No. REd
Figure S is a cross-sectional view showing an example of the configuration for the upper pipe lamina, Figure S is a cross-sectional view showing an example of the configuration for the lower spray, Figure 4 is a graph showing the steel plate cooling rate values of the lifting platform applied to each thickness of steel plate, Diagram S is a graph that compares the widthwise girth position of steel plates and the proverbial Tsukwell hardness with and without thinning. (ml (41-... Upper pipeline header, (Il
181 '-' lower spray head 10

Claims (1)

[Claims] 1. Finishing press or hot leveler A small-capacity IIO splay header and a large-capacity splay header are arranged so as to intersect with each other in the front and rear of the sheet-threading direction, and a small-capacity IIO spray header and a large-capacity splay header are arranged in front and back in the sheet-threading direction.
A steel plate cooling device characterized in that a lower spray header is configured by arranging IK alternately.