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Device and method for cooling intermediate rolled blank of hot rolled strip

A hot-rolled strip and cooling device technology, applied in the field of cooling devices for hot-rolled strip rolling intermediate billets, can solve the problems of large overall investment, complex equipment, high requirements for gas path cleanliness and pressure control range, and achieve Reduce investment, simplify equipment manufacturing process, and improve control accuracy

Active Publication Date: 2011-02-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned intermediate billet cooling system in the form of gas mist cooling has relatively complicated equipment, and has high requirements for the cleanliness of the air and water channels and the pressure control range, resulting in a large overall investment, which limits its use to a certain extent

Method used

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  • Device and method for cooling intermediate rolled blank of hot rolled strip
  • Device and method for cooling intermediate rolled blank of hot rolled strip
  • Device and method for cooling intermediate rolled blank of hot rolled strip

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0043] The production of 18.5mm thick × 80 pipeline steel by controlled rolling process is as follows: image 3The arrangement shown implements controlled cooling of the intermediate billet. 48 groups of cooling devices are installed on the conveying roller table at the exit of the roughing mill to form a cooling area. The cooling water pressure is 1.0MPa. First, the raw billet is rolled by the roughing mill into an intermediate billet with a thickness of 55mm. The temperature of the intermediate billet is 1030-1050°C. While rolling, it is sent into the cooling area; the computer calculates the amount of cooling water according to the thickness, width, steel type and temperature of the intermediate billet, and the target cooling temperature of the intermediate billet, and controls the opening and closing of the control valve through the programmable controller. The number of opening and closing and the flow rate of the flow control valve, the upper and lower headers implement ...

example 2

[0045] Ferritic rolling process produces 2.0mm thick IF steel, such as figure 2 The arrangement shown implements controlled cooling of the intermediate billet. 32 groups of cooling devices are installed on the conveying roller table at the exit of the roughing mill to form a cooling area, the cooling water pressure is 0.40MPa, the raw billet is first rolled by the roughing mill into an intermediate billet with a thickness of 22mm, and the temperature of the intermediate billet is 1020-1050°C. While rolling, it is sent into the cooling area; the computer calculates the amount of cooling water according to the thickness, width, steel type and temperature of the intermediate billet, and the target cooling temperature of the intermediate billet, and the opening and closing control valve is operated by the programmable controller. The closing quantity and the flow rate of the flow control valve, the upper and lower headers implement impact jets to control the cooling rate of the i...

example 3

[0047] The production of 3.0mm welded bottle steel HP295 adopts such as figure 2 The arrangement shown implements controlled cooling of the intermediate billet. 36 groups of cooling devices are installed on the conveying roller table at the exit of the roughing mill to form a cooling area. The cooling water pressure is 0.60MPa. First, the roughing mill rolls the raw billet into an intermediate billet with a thickness of 32mm. The temperature of the intermediate billet is 1010-1040°C. While rolling, it is sent into the cooling area; the computer calculates the amount of cooling water according to the thickness, width, steel type and temperature of the intermediate billet, and the target cooling temperature of the intermediate billet, and the opening and closing control valve is operated by the programmable controller. The closing quantity and the flow rate of the flow control valve, the upper and lower headers implement impact jets to control the cooling of the intermediate bi...

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Abstract

The invention provides a device and method for cooling an intermediate rolled blank of a hot rolled strip. The device comprises an upper collecting pipe arranged above roller beds and a lower collecting pipe arranged between the roller beds, wherein the upper collecting pipe and the lower collecting pipe are both provided with nozzles and opening and closing control valves and are connected with a workshop circulating water system through collecting pipe water supply pipelines; and the collecting pipe water supply pipelines are provided with flow control valves. The opening and closing control valves and the flow control valves are controlled by a programmable controller. A plurality of groups of cooling collecting pipes which can be independently controlled to open and close and has smaller flow are arranged between every two roller beds, the intermediate blank is cooled by adopting water jet, and the cooling speed is correspondingly dynamically controlled according to the transmission speed of the intermediate blank. The invention has the advantages of relatively simple structure of the device, low requirement for water quality, good flow stability and high production efficiency, and is convenient to maintain and free of limit of speed raising of a roughing mill and deceleration of throwing steel; rolling mill cooling water is adopted and a single water supply and drainage system is not needed; and grains of the intermediate blank are remarkably refined, and the mechanical property of a steel plate is improved.

Description

technical field [0001] The invention belongs to the cooling technology of steel rolling production, in particular to a cooling device and cooling method for hot-rolled strip steel rolling intermediate blank. Background technique [0002] In order to improve the strength and toughness of steel, the austenite grains are refined by controlled rolling or the dislocation slip bands inside the deformed austenite grains are increased, that is, the effective grain boundary area is increased, which is the ferrite nucleation during phase transformation. Provide more and more dispersed nucleation sites, and obtain finely dispersed ferrite and pearlite or bainite structures. Refining ferrite grains can not only increase the strength of steel, but also improve the toughness of steel. However, the development of the traditional controlled rolling theory has not surpassed the three-stage controlled rolling technology, namely: rolling in the austenite recrystallization zone, rolling in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74B21B45/02B21B37/76
CPCY02P70/10
Inventor 张立杰余伟刘涛何春雨詹智敏韩爽邓宏玉程知松徐言东
Owner UNIV OF SCI & TECH BEIJING
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