RU53188U1 - Adjustable cooling cooling system at the intermediate rolling bottle of the hot-rolling roll - Google Patents

Adjustable cooling cooling system at the intermediate rolling bottle of the hot-rolling roll Download PDF

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Publication number
RU53188U1
RU53188U1 RU2005115718/22U RU2005115718U RU53188U1 RU 53188 U1 RU53188 U1 RU 53188U1 RU 2005115718/22 U RU2005115718/22 U RU 2005115718/22U RU 2005115718 U RU2005115718 U RU 2005115718U RU 53188 U1 RU53188 U1 RU 53188U1
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RU
Russia
Prior art keywords
cooling
roll
rolling
collectors
mill
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RU2005115718/22U
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Russian (ru)
Inventor
Сергей Владимирович Денисов
Павел Николаевич Смирнов
Владимир Георгиевич Кузнецов
Эдуард Михайлович Голубчик
Виталий Владимирович Галкин
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Открытое акционерное общество "Магнитогорский металлургический комбинат"
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Priority to RU2005115718/22U priority Critical patent/RU53188U1/en
Application granted granted Critical
Publication of RU53188U1 publication Critical patent/RU53188U1/en

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Abstract

The utility model relates to metallurgical production, and can be used to cool the roll before its task in the stand of the finishing group of a broadband mill in the production of hot rolled strips. The controlled cooling cooling system for rolling during rolling on a broadband hot rolling mill includes devices for descaling from the strip surface, cooling strips with water in the inter-stand spaces in the finishing group of the mill, and also a cooling device for strips on the discharge roller table. In addition, the system of controlled cooling of the roll contains a device for differentiated cooling of the roll located along the length of the roughing stand before the final breakdown, including upper and lower collectors with rows of nozzles rigidly fixed above the intermediate roller table and a control valve for supplying cooling water to the collectors, and in the upper the collectors from the side of the upper surface of the nozzle roll are capable of deflecting water jets along the rolling axis by an angle of 0-90 degrees from vertical th axis simultaneously in opposite directions across the width of roll, and a lower header arranged at the end face of the rollers of the intermediate roller conveyor, a nozzle mounted in a plane perpendicular to the direction of movement of roll angle of 5-30 ° to the bottom surface. The inventive system of controlled cooling cooling allows you to significantly increase the performance of a broadband hot rolling mill, expands its technological capabilities, and also significantly improves the quality of the obtained hot-rolled strip due to the elimination of the defect "rolled" scale.

Description

The utility model relates to metallurgical production, and can be used to cool the roll before its task in the stand of the finishing group of a broadband mill in the production of hot rolled strips.
The use of devices for forced cooling of the roll in the section between the roughing and finishing groups of the stands of the broadband mill allows controlling its thermal profile in a wide range, as well as maintaining the temperature equal throughout the section of the roll. This helps to stabilize the mechanical properties and geometric parameters in the roll before its task in the finishing stands of the mill, eliminates the appearance of the defect "rolled scale". In addition, the productivity of traditional (non-specialized) broadband hot rolling mills is significantly increased, as it becomes possible to roll metal in the finishing group at low (850-900 ° C) temperatures. This is relevant in the production of hot rolled products from low alloy, microalloyed steels, especially in the production of rolled products for large diameter pipes.
Currently, the most widespread are systems for cooling the strip surface during the rolling process, in which water is supplied to the strip by jets injected through nozzles. Cooling, as a rule, is carried out at the stage of cleaning the roll from scale by water breakdown systems, or in inter-stand spaces in the finishing groups of stands, as well as cooling devices on the discharge roller table before winding the strips into a roll. In some cases, the strip is cooled by feeding
cooler to the surface of the rolls. (For example, see A.S. USSR No. 997888, A.S. USSR No. 806189, A.S. USSR No. 928833. MKI 5 V 21 V 45/02, 45/04).
The disadvantages of these devices is the low efficiency of controlling the temperature of the roll over its cross section before its task in the finishing group of stands.
The closest analogue to the claimed utility model is the cooling system used in the 2000 hot rolling mill of OJSC North-Steel (Cherepovets) (see Technology of rolling production. Reference: Benyakovsky MA, Bogoyavlensky KN, Vitkin A.I. et al. In 2 books, Book 2. Moscow: Metallurgy, 1991. - P.578.).
The known system of controlled cooling includes a system of descaling from the surface of the strip before finishing rolling, a device for cooling the strips with water in the inter-stand spaces in the finishing group of the mill, and a cooling device for the strips on the discharge roller table.
A disadvantage of the known system of controlled cooling of the strip is the inability to control the temperature of the roll before its task in the finishing group of stands. As a result, there is a significant temperature drop across the roll section, especially in the production of a thick strip (more than 16-20 mm), and, consequently, a significant difference in mechanical properties. In addition, due to various cooling conditions of a wide thick roll, a scale is formed on its surface, which has an unequal composition and thickness. All this together leads to the appearance of a “rolled mill scale” defect on the finished strip.
The task to which the claimed utility model is directed is to ensure the optimal microstructure in hot rolled steel, and, consequently, mechanical properties, by controlling the cooling of the roll on the intermediate roller table, increasing the performance of a broadband hot rolling mill, expanding its technological capabilities, and also improving quality rolled products due to the exclusion of the defect “rolled” scale.
The technical result is achieved through the use in the system of controlled cooling of the roll when rolling on a broadband hot rolling mill additional devices of differentiated cooling of the roll along its length, located after the roughing group of stands to finish hydrobolt and allowing to control the thermal profile of the roll.
The essence of the proposed utility model is illustrated in the drawing, where figure 1 shows a schematic diagram of a device for differential cooling of the roll along its length.
The device for differential cooling of the roll along its length (Fig. 1) is made in the form of upper collectors 1 rigidly fixed above the intermediate roller table with rows of nozzles 2, lower collectors 3 rigidly fixed from the front side under the rollers 4 of the intermediate roller table. In addition, the device for differential cooling of the roll contains a control valve 5 for supplying cooling water to the collector. In the upper collectors 1, from the side of the upper surface of the roll 6, the nozzles 2 are configured to deflect water jets along the rolling axis by an angle of 0-90 degrees from the vertical axis simultaneously in opposite directions along the entire width of the roll. In the lower manifolds 3, nozzles 2 are installed in a plane perpendicular to the direction of movement of the roll at an angle of 5-30 ° to its lower surface.
Water is supplied to the collector through a common pipeline. Water consumption per nozzle is up to 9 m 3 / hour. Water flow control is carried out through a control valve 5 for cooling the supply of cooling water to the collector.
The controlled cooling cooling system for rolling during rolling at a broadband hot rolling mill works as follows (for example, rolling a slab of steel grade 10G2FB into a strip measuring 20x2300 mm on a broadband mill 2500 of hot rolling of OJSC MMK).
After setting up the cooling devices, a slab heated to the required temperature of 1220 ° C is fed to a broadband hot rolling mill 2500,
including a roughing stand group, an intermediate roller table, a fine water hammer, a continuous continuous group of stands with inter-rack cooling devices, as well as a discharge roller table with cooling sections and a group of coilers.
After rolling in a rough group of stands of a broadband mill, a roll of 70 mm thick having a temperature of 1100-1150 ° C enters the intermediate roller table. On the intermediate roller table, differential cooling of the surface of the roll is carried out with water. At the same time, depending on the required properties, with the help of a control valve, water is supplied to the upper and lower collectors of the differential cooling device of the roll along its length. The design of the collectors allows the deviation of water jets from the side of the upper surface of the roll to an angle of 0-90 ° from the vertical axis simultaneously in opposite directions along the axis of rolling. Water is supplied from the lower surface of the roll in a plane perpendicular to the direction of movement of the roll. This allows you to maintain the temperature of the roll throughout its volume in the range of 870-890 ° C before entering the finishing descaler.
After the reel is sent to the final hydraulic breakdown, and then the strip is rolled in the finishing continuous group of stands. The temperature of the end of the rolling is maintained in the range of 760-800 ° C. After that, the rental along the discharge roller table is sent to the coilers, where the strip is wound into a roll at a temperature of 570-610 ° C.
Depending on the rolled product range, it is possible to use the inventive device for differential cooling of the roll at its required length.
Considering that additional differentiable oxidation of the surface is introduced, in which accelerated formation of a layer of homogeneous scale, uniform in thickness, occurs, the composition of the scale on the surface of the roll changes. This helps to improve the conditions for removing it from the surface.
the roll with subsequent finishing hydraulic breakdown, and, consequently, improves the quality of rolled products, reducing the defect “rolled” scale.
So, based on the foregoing, we can conclude that the inventive system of controlled cooling cooling when rolling on a broadband hot rolling mill in comparison with the known, allows to obtain guaranteed properties with maximum performance broadband hot rolling mill.

Claims (1)

  1. The system of controlled cooling of rolling stock during rolling on a broadband hot rolling mill, including devices for descaling from the strip surface, cooling strips with water in the inter-stand spaces in the finishing group of the mill, and also a cooling device for strips on the discharge roller table, characterized in that the controlled cooling cooling system of the rolling stock further comprises located after the roughing group of stands before finishing the hydraulic breakdown, a device for differential cooling of the roll along its length, including rigidly fixed the upper and lower collectors with rows of nozzles above the intermediate roller table and the control valve for supplying cooling water to the collectors, moreover, in the upper collectors from the side of the upper surface of the nozzle roll, the water jets deviate along the rolling axis by an angle of 0-90 ° from the vertical the axes are simultaneously in opposite directions along the entire width of the roll, and in the lower manifolds located on the end side of the rollers of the intermediate roller table, the nozzles are installed in a plane perpendicular to the direction Vision peal angle of 5-30 ° to the bottom surface.
    Figure 00000001
RU2005115718/22U 2005-05-23 2005-05-23 Adjustable cooling cooling system at the intermediate rolling bottle of the hot-rolling roll RU53188U1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2005115718/22U RU53188U1 (en) 2005-05-23 2005-05-23 Adjustable cooling cooling system at the intermediate rolling bottle of the hot-rolling roll

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
RU2005115718/22U RU53188U1 (en) 2005-05-23 2005-05-23 Adjustable cooling cooling system at the intermediate rolling bottle of the hot-rolling roll

Publications (1)

Publication Number Publication Date
RU53188U1 true RU53188U1 (en) 2006-05-10

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Family Applications (1)

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RU2005115718/22U RU53188U1 (en) 2005-05-23 2005-05-23 Adjustable cooling cooling system at the intermediate rolling bottle of the hot-rolling roll

Country Status (1)

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RU (1) RU53188U1 (en)

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Legal Events

Date Code Title Description
MM1K Utility model has become invalid (non-payment of fees)

Effective date: 20100524