TW544342B - Cooling apparatus, manufacturing method, and manufacturing line for hot rolled steel strip - Google Patents

Abstract

The present invention relates to a cooling apparatus for hot rolled steel strip comprising: an upper means for cooling an upper side of a steel strip transported by transporting rolls after hot rolling, located above the upper side of the steel strip; and a bottom means for cooling the bottom side of the steel strip, located under the bottom side of the steel strip, each means for cooling including: a protecting member having at least one cooling water hole slotted thereon, located near the surface of the steel strip; at least one cooling water header, located across the steel strip from the protecting member; and cooling water injection nozzles for injecting cooling water vertically onto the surface of the steel strip through the cooling water hole, projected on the cooling water header, wherein the top of the cooling water injection nozzle is positioned at a longer distance from the surface of the steel strip than the surface of the protecting member facing to the surface of the steel strip. The present invention allows to constantly transport the steel strip after hot rolling and to rapidly and homogeneously cool it.

Description

544342

V. Description of the invention (1) [Detailed description of the invention [Technical Field] Hair = Hot-rolled steel strip cooling device after hot-rolling, manufacturing method for rolling steel using the same, and hot-rolled steel strip manufacturing line background technology] German: ：: L steel strips are placed in a heating furnace to heat the iron nuggets to a predetermined temperature i bar force: The heated iron nuggets are rolled to a predetermined thickness of stanc〇m ^ by a rough rolling mill, and then the thick bar steel is used to Multiple rolling mill stands (mi 1 1 degree white = finishing mill ⑴nishing mui), rolled to a predetermined thickness ttble) 1 y, and then the rolled steel strip is cooled on the output roller table (runout 槪 I cooling device side- It is produced while being conveyed, and then placed under the finishing mill and coiled. The so-called output roller is a hot-rolled steel strip conveying device stored in the house ρ, and the steel strip uses a plurality of suitable m The transport is carried lightly. Steel I :: 4: The second and second cooling device is the first-stable transport is given priority. Figure 1 shows the structure. Among them, Figure 1A shows the appearance and follows the front view of the handle. The upper cooling system of the steel strip 9 is shown in Figure 1. The water pressure set on the straight line prevents the steel strip 9 from moving / > 〇 / the main tube laminar cooling water 32, and uses the belt cooling to squeeze it :; This ... In recent years, the heat = Chaogang The belt 9 is sprayed. The carbon equivalent is also high-strength. Increasingly, it is required to be superior in processability, or even low ^. For this reason, the fine graining of the steel belt structure is a

544342 V. Description of the invention (2) An effective method, after hot rolling, the steel strip must be subjected to more rapid carbon equivalents such as ultra-low carbon steel, which is easier to coarsen because of recrystallization, because of recrystallization. This: cooling at a cooling rate of 2,000 t / s. In order to carry out this kind of rapid cooling, Beijiang Steel τ is disclosed in Japanese Patent Publication No. 6ΓΓ, · T, 'It is disclosed that the cooling water is provided in the light room; there are multiple holes: cooling water Spray plate, using this hole as a nozzle, the technology of changing the under-angle and cooling water under the belt that sprays cold water toward the steel belt. γ #Lifting steel However, in Japanese Patent Application Laid-Open No. Sho 62_2 5 9 6 technology, there are various problems described below. It is uncovered in the report. 1) Because the hot-rolled steel strip is processed from the finishing mill to the coiling end without additional tension, it is transported while vibrating up and down on the output roller table. If there is no tension energy ηΠ according to this technology, it will increase the up and down vibration, so there is no ;: increase the amount of water in the Θ part, for example, it is impossible to make a steel strip with a thickness of 3mm by 200. "/

Cool at the above cooling rate. S 2) This technology cannot cool the top and bottom of the steel strip at equal cooling rates. ^ Ding々3) Although this technology is based on the premise of cooling with water density around 1000L / min · μ, for example, the thickness of the plate is about 3mm ^ ^ It is more than 2 0 ° c / s cooling rate for cooling, you need more water to start, degrees. However, if the water density is increased by the cooling device of this technology, near the center of the width direction of the steel strip, it will be as shown in Fig. 2A.

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This is because the cooling water after spraying will stay in the narrow gap between the cooling water spray plate and the steel. Therefore, the flow velocity of the sprayed cooling water will be reduced, and the cooling capacity cannot be obtained. In addition, near the edge in the width direction of the steel strip 'because the cooling water will flow off from the edge, a predetermined cooling energy can be obtained. As shown in Figure 2B', the temperature distribution in the width of the steel strip will appear at the two edges The target temperature will be obtained, but the center is in an inverted V-shaped distribution higher than the target temperature, and uniform cooling in the width direction cannot be performed. Therefore, if the distance between the cooling water spray plate and the steel strip is increased, it will be as follows As shown in FIG. 3A, a predetermined cooling capacity is obtained while suppressing the cooling water retention phenomenon near the center of the high band width. However, since the cooled cooling water will be discharged from the vicinity of the width center of the steel strip toward the width edge, the cooling water flow at the width edge will be disturbed and the cooling capacity will be reduced. As a result, as shown in FIG. 3B, the temperature distribution in the width direction of the steel strip will be souther than the target temperature at the two edges, and a positive V-shaped distribution of the target temperature will be obtained at the center, and uniform cooling in the width direction cannot be performed. 0 'In addition, even if the distance between the cooling water spray plate and the steel strip, which also guides, is taken as an appropriate distance, the temperature distribution in the width direction of the steel strip after cooling will show an inverted V shape in FIG. 2B and a positive V shape in FIG. 3B The combined M-shaped distribution does not allow uniform cooling in the width direction. 4) According to this technology, if a plurality of holes provided on the cooling water spray plate are used as nozzles and the angle is changed to spray cooling water, the distance that the cooling water reaches below the steel strip will vary with the nozzle. Therefore, cooling the steel strip obliquely

A: \ 91118176.ptd Page 8 544342 ------ V. Description of the invention (4) The distance between the water and the steel strip will become larger, and the steel strip will be cooled by the current. In addition, the characters such as 衰减 and 衰减 are greatly attenuated and cannot be effectively affected by the cooling water of the wheat. Therefore, it is easier to receive uniform cooling because of the medium. Difficult to carry steel strip width direction

[Disclosure of the invention J In view of this, the purpose of the present invention is to hot-rolled steel strip after rolling, and it can be stably transported and placed on the hot dry steel strip using it == cooling strip of steel strip; ; 'To achieve the above purpose, then use the following? . To achieve this, it is provided on the hot-dried steel strip that is used after rolling and is used to dry the steel / cold-part device, and is provided for cooling and hot-rolled steel strip transportation and is placed under the hot-rolled steel strip, and The cooling rail is provided with a structure; a cooling mechanism; wherein the upper cooling mechanism and the lower surface are provided with at least one cooling water head located near the steel strip surface of the hot-rolled steel strip and a hot-rolled steel on the lunar side ; And a cooling water spray nozzle which protrudes from the water head and is placed, and sprays the cooling water approximately perpendicularly on the steel strip surface of the hot rolled steel strip through the cooling water passage hole; wherein the cooling water spray nozzle is arranged away from the hot rolled steel The distance of the belt is far longer than the distance between the protective member and the opposite surface of the hot-rolled steel belt. ° Furthermore, if the cooling device of such a hot-rolled steel strip is installed on the output roller table of a hot-rolled steel strip manufacturing line, it can provide a hot-rolled steel strip that can stably carry the hot-rolled steel strip and can be uniformly and rapidly cooled. . [Embodiment of Invention]

544342 V. Description of Hot Rolled Steel Strip (5) Figure 4 shows an example of a hot-dried production line of the present invention. The manufacturing line for placing this hot-rolled steel strip is a rough rolling mill 1 for forming a thick strip 2 of the following machine; the rough strip 2 is dried to form a roll of steel strip 9; The formed refined milk is formed into a hot-rolled hot-rolled steel strip 9 of a predetermined plate thickness, and is conveyed by a transfer roll 7; the coiler 6 is used to wind the hot-rolled steel strip 9 that has been sent after finishing rolling. pt I Road 5; 5 moved, followed by the finishing rolling mill; 3 rear, a cooling device 4 of the hot-rolled steel strip of the present invention is used for rolling outside the roll table, and the steel 9 is rapidly cooled as shown in Figure 1 As shown in A, a conventional cooling device 8 is provided. It may also be located downstream thereof. Fig. 5A shows an enlarged view of the hot-rolled steel strip of the present invention and a part of the cooling device of Fig. 5A. "An example of clothing placement. As shown in Fig. 5B, the cooling device for the rolled steel strip is composed of: the lower surface of the hot-rolled steel strip 9 and the bottom cooling_ 二 和" and placed on the top of the steel strip, and The hot-rolled steel strip 9 is provided with a cooling mechanism 4b. The cooling mechanisms 4a and 4b of 7 P are respectively borrowed from a < & earth, a strike 4., λ τ blade, and Yes · At the place where the steel strip surface 9 is located near the hot-rolled steel strip 9, a flat-shaped protective member arranged substantially parallel to the surface of the steel strip (surface protective member 10a, upper protective member 10b); and The cooling members 1 Oa and 1 / Ob are respectively arranged on the back side of the hot-rolled steel strip 9 (the cooling head 1 2a on the lower side and the cooling head on the upper side 2b). Each cooling head 12a / 12b is attached to the wheel exit roller The width direction and the length direction of the channel are arranged at a proper interval and the cooling water spray nozzles 5 are prominently arranged. The cooling water spray nozzles 15 are arranged such that the distance between the front end of the nozzle and the hot-rolled steel strip 9 is farther than that of each protection

A: \ 91118176.ptd Page 10 το% V. Description of the invention (6) The position of the compliance member 10 and the hot-rolled steel strip protection member 1 0 runs through the distance between the person " and 3. In each case, each cooling water spray nozzle ~ the water passes through a plurality of cooling water passage holes 11, and the water is sprayed approximately perpendicularly to the cooling water passage holes 11 and will be cooled again in hot rolled steel; Opposite two f: two hot-rolled steel strips 9 provided on the lower side. This: With the wrong guide roller Η, the hot-rolled steel strip 9 i '/ V roll 14 facing the opposite direction can be more stable. It is best to be at a position approximately on the upper side of the conveying roll 7, < Π ::: Opposite to the transport light 7 ί The position where the guide roller 14 is removed above the upper cold heading mechanism 4b: The complex member 10b is provided in addition to the lower side of the cooler 丄. The rollers in the lengthwise direction of the exit rollers are arranged at appropriate intervals. Therefore, they are installed at the bottom of the cooling water head 2 so as to be installed between each of the transporting Xingkun 7s. In addition, in the "two shots, the water head 1 2a is also set between the conveying rollers 7, but Vί ί7 V ^^ ^ fal ° ^ ^ ^ ^ to divide the length or width of the output report into t ΐΐ below Cooling head 12a. If the cooling head 12 is set in sections, the cooling of the hot-rolled steel strip 9 can be controlled more delicately. When the section is to be segmented, for example, when the steel strip is moved to the field, and the Guanggeng strip is used, The cooling start point, II, is changed by a more detailed change, but the head 12 position is initially set, and the cold_start temperature of the hot-rolled steel strip 9 can be set to ^. In addition, when the width direction is segmented, the corresponding Various

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Master 1 2 and efficient cooling V. Invention description (7) The width of the steel strip can choose cooling water but 0 related cooling head 1 2 b can also cat ... door, _ "" and get the same effect . Further, it is preferable that the upper cooling water head 12b is provided to face the lower cooling water head 12a through the hot-rolled steel strip 9. With the relative setting, 胄 has the advantages of easily obtaining the cooling balance between the upper and lower sides, and can easily adjust the head position to start cooling, and can use the upper and lower sides to receive water pressure to stably transport the hot-rolled steel strip 9 and other advantages.

It is preferable that the cooling water spray nozzles 15 provided on the upper cooling mechanism # protruding from the upper and lower cooling water heads 12 and the cooling water spray nozzles 15 on the lower cooling mechanism 乜 are preferably arranged to face each other with the hot-rolled steel strip 9 interposed therebetween. status. This is because the balance of cooling and water pressure can be easily obtained.

In addition, as described in uranium, each cooling water spray nozzle 15 is disposed so as to protrude from each cooling water head 12 and spray the cooling water approximately perpendicular to the surface of the steel strip. In other words, 'When the nozzle setting surface of the cooling water head 12 is shown in FIG. 5 β and the setting is parallel to the steel belt, the cooling water injection nozzle 5 is set to project vertically from the cooling water head 12. According to this structure, the cooling device disclosed in Japanese Patent Application Laid-Open No. 62_ 2 5 9 6 1 0 can spray the cooling water from the nozzle, and the degree of influence of the cooling water after spraying Reduce it. In addition, since the flow velocity of the cooling water sprayed from each nozzle and impinging on the steel belt is almost equal, the cooling average effect can be achieved. In the cooling water spray nozzle 15, a laminar flow nozzle is generally used. Because the cooling water jet of the laminar nozzle is round, the sprayed water flow will not be affected.

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V. Description of the invention (8) Dispersive and columnar laminar flow. The impact of the bridging on the steel strip is the laminar flow, which can also be small. The so-called columnar layer state. "〆σ 卩 刀 is a vortex-like turbulent flow f 6A, 6B system" is a columnar laminar flow, non-laminar flow / belongs to the columnar laminar flow U 'because the water flow is not dispersed enough, Therefore, the cooling efficiency is better. It can be performed in excess of 2000r / s and '= ^. When it is a non-Janliu t case, even if the nozzle is relying on the steel belt, only the cooling water velocity sprayed by the nozzle, It will decay with the cooling water staying between the steel belt and the nozzle, so the cooling efficiency is poor.

/ Even with the conventional cooling device, laminar flow cooling is used for cooling on the steel strip. However, because the water belonging to the cold part falls on the entire surface of the steel strip, the entire surface of the part can be covered with cooling water. Using film boiling for cooling, the maximum T speed in this zone is only about 100 t: / s. On the other hand, the cold σP clothes set according to the present invention uses the laminar flow nozzle on the cooling water spray nozzle, which is the same as the conventional device. The cooling device of the present invention can be used at about 2500L / min.

• A large amount of cooling water is sprayed with a water density above m. Therefore, while the entire steel strip is covered by the cooling water, the cooling water sprayed from the nozzle can directly contact the steel strip, so steel with a thickness of about 3 mm can be used. Band by more than 2000. 〇 / s cooling. In addition, the cooling rate depends on the thickness of the steel strip. The thinner the plate, the faster it becomes. When the cooling conditions such as water volume density are constant, ^ monthly condition, there is a relationship (plate thickness) X (cooling rate) approximately constant. Therefore, even when the plate thickness is thick, for example, by increasing the water density, the desired cooling rate can be obtained. Furthermore, it is desirable that the spraying diameter of the cooling water spraying nozzle of the present invention is set to

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An example of a cooling mechanism in which a slit-shaped cooling water passes through a protective member as shown in FIG. 7A is penetrated and shown in FIG. 8B. Fig. 8A shows the cooling mechanism below, and Fig. 8B shows the cooling mechanism in Fig. 8A including the cooling mechanism above. Therefore, it is preferable that the water is sprayed through the hole 11 and the slit 11 is only acceptable. Even if it is at the cooling water passage end, a plurality of nozzles 1 5 ′ are provided in each of the slit-shaped cooling water passage holes 11 defined as the slit-shaped members 10 above, and the cooling water of the laminar flow 13 is ejected from these. . Although the opening of this water passage hole 1 1 is to enlarge the sprayed cooling water = 2 as large as possible, if it is too large, the front end of the tape 9 will be contacted with the edge of the hole and burnt defects will occur. The opening of one of the slit-shaped cooling water passage holes is shown in FIG. 8A, and the size is set to linearly accommodate 2 to 10 degrees of cold mouths and 15 degrees. In addition, a plurality of linear cooling nozzles are also arranged in a plurality of rows in each slit-shaped cooling water. As shown in FIG. 8A, all the cooling water passage holes 丨 丨 need not be slit-shaped cooling water passage holes 丨 丨 If a large number of cooling water passage holes 丨 丨There is no problem in passing. In particular, it is difficult to arrange the cooling water passage hole 11 at the center of the width direction and the second arrangement. The slit-shaped cooling passages f through holes 丨 丨 are preferably designed so that the discharged water is out of the cooling device ', and the length direction is inclined with respect to the steel belt 9 conveying direction 7 and horizontally. If the length direction intersects at right angles to the conveyance direction of the steel Buddha 9, the drainage flow may be disordered, and f may cause the front end of the steel belt 9 to hit the hole, causing the steel belt 9 or cooling water.

544342 V. Description of the invention (11) Damage to hole 1 1 occurred. If this length direction is flat and strong, 4., ^ ^ ^ t square; steel ▼ 9 direction of delivery-: ί "The method is smooth. In addition, as shown in Figure 8A, the slit-shaped cooling water passes through the hole U It is equipped with the output roller table A = roughly linearly symmetric, and the cooling water, 7 • Zhi Wang Shi Gu A.. Τ., The length of the through hole 11 is toward the steel belt 9, and it expands in the horizontal direction and Inclined, so the drainage / smooth discharge is better than the cooling device. Figure 9 shows an example of the positional relationship between the water spray nozzles and the protective members of the cooling mechanism below. Column = Middle 'The lower protective member 10a is thinner, and the front end 16 of the cooling water spray nozzle 15 is provided at a position lower than the lower protective member i0a. Figure 10 shows the protective member and cooling of the lower cooling mechanism. Another example of the positional relationship between the water head and the cooling water spray nozzle. 7 In this example, the lower protective member 10a is thicker, and the front end of the cooling water spray nozzle 15 is disposed at the lower protective member 10a. 11 内。 In Figure 9 below the cold section mechanism, before the cooling water spray nozzle 16 The distance between β and steel V9 steel page β is the distance between the upper surface of the protective member and the steel strip_Ya, and the distance between the lower surface of the anti-compliance member 10a and the cooling water head i2a. The following method is used to determine. The way to obtain the required cooling speed is to determine the impact speed of the cold mouth P water layer on the steel belt / iL 13 and the distance between the cooling water spray nozzle 15 and the front end of the cooling water spray nozzle required to ensure this impact speed. The distance Xa between the 6 and the steel f plane, considering the cooling water spray nozzle 丨 5 spray port

544342

: After making a decision. At this time, it is preferable to set the distance between the 16 faces of the front face of the cooling water spray nozzle 16 to 100 mm or less. This is because when the cooled cooling water flows out between the steel belt 9 and the protective member 〇〇a, it will: hinder the cooling water laminar flow 13 sprayed from the cooling water spray nozzle 15 to impact the steel: especially if If the distance X a exceeds 1000 mm, the cooling water laminar flow 13: the attenuation of the speed will become obvious, which will further prevent the cooling water from impacting the steel: 'It is difficult to perform strong cooling. In addition, as described above, the distance between the front end 16 of the 3 water jet nozzle 16 and the steel belt 9 is set to be longer than the distance between the t-proof member 10a and the facing surface of the steel belt 9. In other words, the distance χ a between the cooling water front end 16 and the surface of the steel strip is determined in a way that is greater than the distance between the upper surface of the protective member 10a and the surface of the steel strip. Brother

The distance 仏 between the upper surface of the protective member 10a and the steel belt surface is determined from the viewpoint that the steel belt 9 is stably transported on the upper surface of the protective member 10a. When the position of the protective member 10 a is low, as shown in Figure 丨 丨 a, the end of the steel strip to be transported will bend and sag, and it will impact the conveying roller 7 and bounce upward. If it is carried out, the front end of the steel strip 9 will be vibrated up and down, which may impair the stable transportation. In the worst case, as shown in Figure 丨 丨 B, the steel strip 9 will be bent in multiple folds and P is square and cannot move. This phenomenon is more likely to occur when γ a exceeds 50 mm. In addition, if γ a is lower than 丨 〇 _, the steel strip 9 will often come into contact with the protective member 10 a ′, which will not only cause defects on the steel strip, but also easily cause the bending phenomenon as described above. Therefore, Ya is preferably in the range of 〇0 ～ 5〇_. The distance 2 & between the lower surface of the protective member 10a and the lower cooling water head 12a constitutes the supply of cooling water sprayed from the cooling water spray nozzles 5 and quickly drains.

544342 V. Description of the invention (13)

The space required for the release, so it is best to design a larger state. However, if it is too large, the cooling water injection nozzle 15 protruding from the cooling head 12a from below must be extremely long. The length of the straight pipe portion of the circular tube laminar flow nozzle used for the cooling water injection nozzle 15 is preferably 5 to 20 with respect to the cooling water injection port ratio. If it is greater than 20, the flow resistance will increase, so the supply pressure of cooling water must be increased, so there is no economic benefit at all. In addition, if the cooling water radiated from the dwelling below 5 ′, as shown in FIG. 6B, a non-laminar flow state is formed and sufficient cooling capacity cannot be obtained. Therefore, the distance Za is determined as follows in consideration of the cooling water discharged from the cooling water passing through the protective member 10a through the hole. The cooling water sprayed from the cooling water spray nozzle 5 and cooling the steel strip 9 flows through the gap (distance Ya) between the protective member 10 and the protective member 10a and the gap between the protective member 10a and the steel band 9. At the two ends in the width direction, ② between the protective member 丨 〇a and the conveying roller 7, and ③ the cooling water passing hole 11 provided in the protective member 10a, there are three $ from: discharge out. Among them, the space between the protective member 10a and the conveying roller 7 ^ Because the front end of the steel belt 9 does not contact the gap, it is usually set to = 1 mm or less', so the amount of cooling water discharged from the path ② is more square. If there is a large amount of cooling water flowing out from the ① path, the flow from the vicinity of the center of the width ^ ° toward the two ends in the width direction will become stronger, and the

Block "Sheng" Shikou 151 3 Temperature distribution in the shape of a regular v-shape as shown by t σ. Therefore, for =: this suppresses the flow from the center of the width direction to the two ends, so it is necessary to provide a cooling water passage hole 11 on the protective structure 4] 1 10 a, so that the cooling water is discharged from the ⑧ path Ψ 丄 [• L ^ ^ Ώ. Therefore, determine the area of the cooling water passage hole 11 and find the amount of cooling water discharged from this area through A W / / 7 water passage holes 1 丨

544342

A :, 9] 118l76.ptd Page 19, 544342 V. Description of the invention (15) The distance Za of the cooling mechanism below takes into consideration the number and setting position of the guide rollers 14 and the gap between the guide 14 and the steel belt 9 Make a decision. In addition, the area of the cooling water passage hole 11 of the protective member 10 b is also determined in consideration of the number and installation position of the guide 14 and the gap between the guide roller 14 and the steel strip 9. Furthermore, the cooling water injection nozzle 15 of the upper cooling mechanism is shown in FIG. 12, and the front end 16 is preferably provided at the inner position of the cooling water passage hole 丨 丨 of the protective member 10 b. The reason is as follows.

In the case of the cooling mechanism below, the cooling water sprayed on the steel strip 9 will fall through the cooling water passing hole 丨 丨 with the gravity through the protective member 10a. However, in the case of the cooling mechanism above, the cooling water is sprayed. Most of the cooling water will be discharged from the two ends in the direction of I degree. Therefore, the cooling water not discharged from the gap between the steel belt g and the protective member 10b will pass through the cooling water passage hole 11 from the lower part of the protective member 丨 0b, and flow into the protective member 丨 Ob and the upper cooling water head 12b. Space. Therefore, in the structure in which the space above the protective member 丨 b is not affected by the water flow at the cooling section sprayed from the cooling water spray nozzle 15, it is best to set The cold water nozzle 15 and the front end 16 are disposed inside the cooling water passage hole 丨 丨.

• In addition, in the case of the cooling mechanism below, it is also dependent on the amount of drainage. Between the bottom ^ 12a and the protective member 10a, the situation may be affected by the drainage flowing to the width 1 ^^ direction ^. Therefore, the cooling water spray nozzle is taken and arranged so that the front end of the cooling water spray nozzle is located at a position where the cooling water of the protective member 1oa passes through the inside.

P.20 544342 V. Description of the invention (16) "-: ί 二 ί: If there is a problem in transportation such as rewinding, etc. in the middle of the belt 9, the hot rolled steel belt 9 is designed to be similar to the steel belt table. At this time, the front end and the rear end of the steel belt can be sent out of the cooling mechanism by the guide roller 14 and the steel belt 9 in a way of forming a rewind in the case of the problem that the transportation is not opened. When following the guide J: Fortunately, a pinch roller is set at the entry end, the exit end, or the middle of the cooling mechanism /, and it is transported into the cooling mechanism 俾 where the steel sheet is forced to be lost. Or sent out of the cooling mechanism. The hot rolling of the present invention constituted in this way can use a protective member or jealousy I, hi, 隹 —bi & Γ, if it is displayed, 'from the top and bottom: Γ while ordering to maintain stable steel strip transport The cooling water is sprayed from the upper and lower sides evenly, and the outer part is: outside, because the cooling water sprayed on the surface of the steel strip is suitable; but: the width direction is also affected by the heat drying when the suppression is minimized. Strong uniform cooling. As shown in FIG. 4, if the cooling of the hot-rolled steel strip of the present invention is performed on the hot-rolled steel strip, i will stop the green evening, and the mountain will be lifted up by the roller L 1 i and then ηη π. : 20 0 C / s rapid cooling is stable and uniform, or hot-dried steel with excellent formability and less formability :, ::: The cooling device of the hot-rolled steel strip of the present invention shown in Fig. 13 is set in Tushishan Indium :: 4 production lines of steel strips' will have a plate thickness of 300 mm and a plate width of 1000 mm; and: steel, using a condensed milk machine composed of seven dryer bases, at a conveying speed m Under the condition of 85Gt, the thickness of steel is rolled to the thickness of steel—Page 2] Page A: \ 91118J76.pid 544342

544342 V. Description of the invention (18) Use a plurality of cooling water passage holes 1 1; arrange the front end of the nozzle with a 5 mm in cooling water spray nozzle 1 5 'above the protective member and the cooling water spray nozzle 1 5 The upper cooling water head 1 2 b is provided, and the upper cooling water head 1 2 b is provided to face the lower cooling water head 1 2 a facing the lower cooling mechanism. In this upper cooling water head 12 b, the cooling water spray nozzles 15 which spray the cooling water are arranged at intervals of 30 mm in the width direction and at intervals of 3 mm in the longitudinal direction. The cooling water spraying nozzles 15 are laminar flow nozzles. The distance X b between the steel strip surface and the front end 16 of the cooling water spray nozzle is 30 mm, the distance Y b between the steel strip surface and the upper protective member 10 b is 15 mm, and the upper protective member 1 〇b and The distance Zb between the upper cooling water heads 12b is set to 30 mm. In addition, the "comparative example is a cooling device shown in Fig. 15 installed on a belt production line" and the same test was performed. The cooling device used in this comparative example is similar to the cooling device of the present invention shown in FIG. 3 except that the cooling water injection nozzle will be buried in the cooling water head 22 and the front end of the nozzle is located on the surface of the cooling water head 22. . Among them, the distance X between the belt surface and the front end of the cooling water spray nozzle is 60 mm, the distance γ between the steel belt surface and the protective member 20 is 20 mm, and the distance between the protective member 20 and the cooling water head 22 is 60 mm. The distance Z is set to 15 mm. , 16 does not tie the temperature distribution in the width direction of the steel strip. When Tian uses the cooling device of the hot-rolled steel strip of the present invention for cooling, the temperature distribution in the temperature direction is about 20 t, and the cooling is performed uniformly in the width direction. At this time, the strength of the hot-rolled steel strip in the width direction is change

544342 V. Description of the invention (19) The movement is 20 MPa. On the other hand, in the comparative example, the temperature distribution in the width direction of the steel strip was ± 50 ° C or more, and a V-shaped temperature distribution was exhibited in the width direction. In addition, because the temperature at the two ends of the strip width is high, the shape will be messy and normal winding cannot be performed. In addition, the variation of the strength of the hot-rolled steel strip in the width direction is 80 MPa. Furthermore, if the protective member of the cooling device used in the comparative example is brought close to the steel strip, an inverted V-shaped temperature distribution will be obtained in the width direction of the steel strip. [Element number description] 1 rough rolling mill 2 rough strip 3 finishing mill 4 cooling device 4a lower cooling mechanism 4b upper cooling mechanism 5 output roller table 6 coiler 7 conveying roller 8 cooling device 9 hot rolled steel strip 10 protective member 10a Lower protective member 10b Upper protective member 11 Cooling water passage hole

A: \ 91118176.ptd Page 24 544342 V. Description of the invention (20) 12 Cooling water head 12a Bottom cooling water head 12b Top cooling water head 13 Cooling water laminar flow 14 Guide roller 15 Cooling water spray nozzle 16 Cooling water spray nozzle front end 20 Protective member 22 Cooling head 31 Laminar flow cooling nozzle for round tube 32 Laminar flow cooling water for round tube 33 Spray nozzle 34 Cooling water

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B is an example of a cooling device for a hot-rolled steel strip on the exit roller table of Baizhi Wheel. A brief description is shown in Fig. 1A, Fig. 0, Fig. 2A, and 2B, respectively. 9 6 1 0 Schematic distribution in the width direction; placed in Dai Temple, cooling water behavior and steel belt Figure 3 A, 3 B, respectively, rabbit a close π Λ between the injection plate and the steel belt; 2 :, 2B: cooling Schematic diagram of the cooling water sprayed steel belt width direction of the device in the width direction of the cooling water and the temperature difference between m 4 &## 〇 mesh / plate degree. Two examples of lines, diagrams. &Amp; Mingzhi Manufacture of hot-rolled steel strip for hot-rolled steel strip cooling device

RfiA 8 ^: Schematic diagram of an example of the cooling device for hot-rolled steel strip. Figures 6A and 6B are respectively;}: Schematic diagrams of the main shape 厣, ώ m7A 7n &# 向 状 层 / 爪, non-laminar flow. 7A to 7D are schematic diagrams of various protection members. 8A and 8B are diagrams showing an example of a cooling mechanism that is provided as shown in Figure ^^^ Ah ^^^ l) V Ώ (Α is not a slit-shaped cooling water passage hole of the plate's defense mechanism. Fig. 9 is an example of the positional relationship among a large 1 ++ Y thin-thickness preventing member, a cooling water head, and a water injection nozzle in the cooling mechanism below. ^ Figure 10 is a protection mechanism in the cooling mechanism below. Another example of the positional relationship between the water spray nozzles of the components, and Figures 11A and 11B are schematic diagrams of the behavior of the steel end during the transportation * ° πιη ^ < Figure 12 shows the upper part of the cold water mechanism + a ^ y τ An example of the positional relationship between the reach prevention member, the cooling water head, and the cooling water spray nozzle = ^ Figure 13 shows the cooling through of the hot-rolled steel strip of the present invention; ° Figure 14 shows the cooling as shown in Figure 13; .. Introduction of the production line of hot rolled steel strip

544342 Schematic illustration of intention. Fig. 15 is a schematic diagram of a hot-rolled steel strip cooling device of a comparative example. Fig. 16 is a temperature distribution diagram in the width direction of the steel strip. 111! 1

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Claims (1)

544342 VI. Scope of patent application Ui Zhu ’s steel belt cooling device is equipped with: and t ^ L delayed hot-rolled steel conveyed by conveying rollers for cooling the above-mentioned rolling complete booklet L above the work ... milk steel ▼ above The upper cooling mechanism and the lower cooling mechanism are provided below the hot-rolled steel strip and for cooling the lower rolled steel #, and the upper cooling mechanism and the lower cooling mechanism in the rolling steel are respectively provided with: At least one protective member passing through the cooling water passage hole is arranged near the steel strip surface of the hot-rolled steel strip; at least one cooling water head is arranged on the back side of the hot-rolled steel strip with respect to the protective member; and A cooling water spray nozzle provided on the cooling water head and spraying cooling water approximately perpendicularly on the steel strip surface of the hot-rolled steel strip through the cooling water passage hole; 'wherein' the cooling water spray nozzle is arranged at a distance The distance 'of the hot-rolled steel strip is far longer than the distance between the protective member and the opposing surface of the hot-rolled steel strip. 2 · The cooling device for hot-rolled steel strips according to item 1 of the patent application scope, wherein the cooling water head of the upper cooling mechanism and the cooling water head of the lower cooling mechanism, and / or the cooling water spray nozzle of the upper cooling mechanism and the lower cooling mechanism described above The cooling water spray nozzles are arranged in a state of facing each other across the hot rolled steel strip. 3. The cooling device for hot-rolled steel strip according to item 1 of the scope of patent application, wherein the distance between the steel strip surface of the hot-rolled steel strip and the front end of the cooling water spray nozzle, H C: \ 2D-CODE \ 91-ll \ 91118176.ptd Page 28 544342 6. The scope of patent application is below 100mm. The cooling device for hot-rolled steel strips in Item 4 of the Patent Application No.1, the distance between the steel strip surface of the second hot-rolled steel strip and the protective member facing the above-mentioned hot-rolled steel ^ plate surface is 10 Within ~ 50mm. 5 · The cooling device of hot rolled steel strip as described in item 1 of the patent application, the front end of the cold water spray nozzle is located in the cooling water passage hole. 6. The cooling device of the hot rolled steel strip according to item 4 of Shenyan's patent scope, the front end of the water injection nozzle of the cold part is located in the cooling water passage hole. 7.2 The cooling device for hot-rolled steel strips declared in item 1 of the patent scope has a slit-shaped cooling water passage hole, and the above-mentioned slit-shaped cooling water passage hole: member: ΐ: direction, system, relative to the hot-rolled steel strip The conveyance direction is horizontally oriented, and the cooling water passes through one of the slit-shaped cooling water passage holes, and the cooling water is ejected through a plurality of cooling water spray nozzles. 8. If the cooling device for hot-rolled steel strip according to item 4 of the patent application, 1 always has a slit-shaped cooling water passage hole, and the long axis f of the slit-shaped cooling water passage hole is relative to the hot rolled steel strip The conveying direction is inclined diagonally in four pages, and the cooling water is passed through one of the slit-shaped cooling water passage holes, and the cooling water is ejected through a plurality of cooling water spray nozzles. 9. If the cooling device for hot-rolled steel strips in item 5 of the scope of patent application has slit-shaped cooling water passage holes, the above-mentioned slit-shaped cooling water passage holes '7 = to' are transported relative to the hot-rolled steel strip The direction is horizontal and oblique, and the cooling water passes through one of the holes through the slit-like shape, and the cooling water is sprayed out through a plurality of cooling water spray nozzles. 1 〇 The cooling device for hot-rolled steel strip, as in item 6 of the patent application, which Page 29 6. In the scope of the patent application, “has a slit shape; the direction of the long axis owed by the person, system 7 = through the hole” The above-mentioned slit-shaped cooling water through hole is inclined, and passes through the island μ square, hot rolled steel T The conveying direction is in a horizontal direction through one of the slit-like cooling water passage holes through the plurality of cooling waters, and the cooling water is sprayed out by the 11 1 / water jet nozzle. In the report, the guide refers to the cooling device for hot dry steel strips in item No. 1 of the patent, which is on the conveying roller on the lower side of the above-mentioned rolled steel strip 1 and approximately opposite. At the position of the side of steel, at least one position is included. Fan 1 The manufacturing method of the belt is composed of a step rolling that is cooled by applying a patented belt. The cooling device of the belt is a method for manufacturing a hot-rolled steel strip Hi ΐ ί steel strip after hot drying, which includes a hot-rolled steel strip using a patent-pending student. The hot-rolled steel is: 1 =: The step; where the cooling device of the hot rolled steel of item 1 of the patent application has the following structure: the cooling head of the upper cooling mechanism and the cooling head of the lower cooling mechanism, and / or the cooling water of the above cooling mechanism The spraying nozzle and the cooling water spraying nozzle 'of the lower cold section mechanism are disposed in a state of being substantially opposed to each other through the hot-rolled steel strip; the distance between the steel strip surface of the hot-rolled steel strip and the front end of the cooling water spraying nozzle is 10 0 mm or less; The distance between the steel strip surface of the hot-rolled steel strip and the surface of the protective member facing the hot-rolled steel strip is within the range of 10 to 50 mm; the front end of the cooling water spray nozzle is located in the slit-shaped cooling Water through the hole 544342 6. The scope of patent application is ΐί; = ΐ: the long axis of the water passage hole is inclined in a horizontal direction relative to the hot dry steel π conveying direction, and the cooling water passes through one of the holes and passes through Plural of the above = cooling water is sprayed out in a slit shape; ~ Hehe nozzle nozzle rollers are on the conveying rollers on the lower side of the hot-rolled steel strip, at least one position on the upper side of the above-mentioned hot-rolled steel strip = towards 14 . The manufacturing method of hot-rolled steel strip as in item 2 of the scope of patent application is located. The cooling system of the medium'hot-rolled steel strip is performed using a columnar laminar flow having a water volume density of 250 0 L / min. Above 1 5 · According to the method for manufacturing a hot-rolled steel strip according to item 13 of the patent application scope, the cooling of the 'hot-rolled steel strip is performed by using a columnar laminar flow having a water density of 250,000 L / min · m2'. The above 1 6 · —type of hot rolled steel strip manufacturing line is a cooling device for hot rolled steel strip that is the first in the scope of patent application, and is installed on the output roller. Item 18: A hot-rolled steel strip manufacturing line is a cooling device for the hot-rolled steel strip in the scope of the patent application, which is installed on the output roller; The cooling device has the following structure: The cooling water head of the upper cooling mechanism and the cooling water bean of the lower cooling mechanism and / or the cooling water spray nozzle of the above upper cooling mechanism and the cooling water spray nozzle of the above-mentioned lower one, The installation is in a state of being opposed to each other through the hot-rolled steel; generally, the distance between the steel strip surface of the hot-rolled steel strip and the front P of the cooling water spray nozzle is less than 100mm; and the steel strip surface of the hot-rolled steel strip and the protective member are in between. Relative to the upper 4 hot rolling, page 31, 544342 6. The distance between the surface of the steel strip applied for the patent application is in the range of 10 ~ 50mm; the front end of the cooling water spray nozzle is located in the slit-like cooling water passage hole; the slit The long-axis direction of the cooling water passing hole is inclined in the horizontal direction with respect to the conveying direction of the hot-rolled steel strip. And a plurality of the cooling water injected through the nozzle - cooling water sprayed; Department of Medicine of the light on the heat transfer strip below the dry side, at generally opposite to the upper side of the hot-rolled steel strip at a position disposed at least at one position. Page 32