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Hot rolled seamless steel pipe on-line cooling system and arrangement method of cooling device on hot rolled seamless steel pipe on-line cooling system

A technology for cooling devices and seamless steel pipes, which is applied in the direction of workpiece cooling devices, metal rolling, metal rolling, etc., can solve the problems of excessive growth of austenite grains, low comprehensive performance of steel pipes, and affecting the mechanical properties of steel pipes, etc. Achieve the effects of grain refinement, improvement of comprehensive performance, and reduction of waiting time

Pending Publication Date: 2020-08-28
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the production process of hot-rolled seamless steel pipes, in the sizing process, in order to ensure better mechanical properties of the steel pipes or control the pipe shape of the steel pipes, it is usually necessary to use air cooling to keep the temperature at a relatively low state during sizing , which reduces the production efficiency of hot-rolled seamless steel pipe
Moreover, when the hot-rolled seamless steel pipe is at the sizing outlet, it is easy to cause excessive growth of austenite grains due to high temperature, which is not conducive to the grain refinement of the ferrite phase transformation process, thus affecting the mechanical properties of the steel pipe
At the same time, when the hot-rolled seamless steel pipe is between the sizing machine and the cooling bed, the on-line regulation of the microstructure and properties of the hot-rolled seamless steel pipe after rolling cannot be realized, so that the control of the structure type, shape, and size of the steel pipe cannot be realized, which leads to the low overall performance

Method used

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  • Hot rolled seamless steel pipe on-line cooling system and arrangement method of cooling device on hot rolled seamless steel pipe on-line cooling system
  • Hot rolled seamless steel pipe on-line cooling system and arrangement method of cooling device on hot rolled seamless steel pipe on-line cooling system
  • Hot rolled seamless steel pipe on-line cooling system and arrangement method of cooling device on hot rolled seamless steel pipe on-line cooling system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] According to the product process requirements of the production line, the cooling device 6 is arranged on the roller table 2 before sizing, and the height of the cooling device 6 can be adjusted with the height of the roller table 2 before sizing, so as to realize the central cooling of the steel pipe, which is 8 sets of circular water spray rings , the cooling water spray ring 7 is composed of an upper water spray ring and a lower water spray ring with an inner diameter of 650mm symmetrically arranged up and down; 6 rows of cooling nozzles are evenly arranged on the inner surface of the water spray ring, and the number of cooling nozzles in a single row is 52. The water pressure adjustment range of the water ring is 0.2-0.8MPa, the flow rate of the upper and lower spray rings can be independently controlled, the spray flow range is 80-150m3 / h, and the water ratio of the upper and lower spray rings is within the range of 1.05-1.5. The water inlet 71 is arranged on the ou...

Embodiment 2

[0056] According to the product process requirements of the production line, the cooling device 6 is arranged at the roller table 3 after sizing and the cooling roller table 5 between the sizing machine 1 and the cooling bed 4 .

[0057] The cooling device 6 installed on the roller table 3 after sizing is 10 integral water spray rings 8. The inner diameter of the water spray ring is 660mm, and the inner surface of the water spray ring is evenly arranged in the width direction with multiple rows of cooling nozzles. In order to realize water spray cooling on the outer surface of the steel pipe, the number of cooling nozzles in a single row is 36-70, and the outer surface of the water spray ring is arranged with a water inlet 81, which is connected to the diversion water collection pipe through the water supply pipeline and the regulating valve group. For the realization of spray ring flow control. The water pressure adjustment range of the water spray ring is 0.2-0.8MPa, the flo...

Embodiment 3

[0062] According to the product process requirements of the production line, the cooling device 6 is arranged at 2 roller tables before sizing, 3 roller tables after sizing, and 5 cooling roller tables between the sizing machine 1 and the cooling bed 4. The cooling water spray ring 7 is composed of an upper half water spray ring 74 and a lower half water spray ring 75 arranged symmetrically up and down. The inner surface of the water spray ring is evenly arranged in the width direction with multiple rows of cooling nozzles, which are used to spray water on the outer surface of the steel pipe for cooling. , the number of single-row cooling nozzles is 36 to 70, and the outer surface of the water spray ring is arranged with a water inlet 71, which is connected to the diversion water collection pipe through the water supply pipeline and the regulating valve group. The water collecting pipe is provided with a number of bypass pipes. By adjusting the opening degree of the bypass pipe...

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Abstract

The invention discloses a hot rolled seamless steel pipe on-line cooling system and an arrangement method of a cooling device on the hot rolled seamless steel pipe on-line cooling system. The main purpose is to improve the production efficiency and comprehensive performance of a hot rolled seamless steel pipe. According to the main technical scheme, the production line comprises a sizing front roller table and a sizing back roller table located before and after a sizing machine separately, a cooling roller table and a cooling device located between a cooling bed and the sizing machine; the cooling device is arranged at the sizing front roller table position; and / or the cooling device is arranged at the sizing back roller table position; and / or the cooling device is arranged at the coolingroller table position; the cooling device comprises a plurality of cooling sprinkler rings arranged along the conveying direction of the roller tables, water inlets are formed in the outer surfaces ofthe cooling sprinkler rings, the water inlets communicate with flow dividing water collecting pipes through water supply pipelines and regulating valve groups, the flow dividing water collecting pipes are arranged parallel to the cooling device, and the length of the water dividing collecting pipe is longer than the length of the cooling device; and water outlets are formed in the inner wall of the cooling sprinkler rings, ring partitions are arranged in the cooling sprinkler rings, and flow holes are formed in the ring partitions.

Description

technical field [0001] The invention relates to the technical field of production of hot-rolled seamless steel pipes, in particular to an on-line cooling system for hot-rolled seamless steel pipes and a method for arranging cooling devices thereon. Background technique [0002] At present, in the production process of hot-rolled seamless steel pipes, in the sizing process, in order to ensure better mechanical properties of the steel pipes or control the pipe shape of the steel pipes, it is usually necessary to use air cooling to keep the temperature at a relatively low state during sizing , which reduces the production efficiency of hot-rolled seamless steel pipes. Moreover, when the hot-rolled seamless steel pipe is at the sizing outlet, it is easy to cause excessive growth of austenite grains due to high temperature, which is not conducive to the grain refinement of the ferrite phase transformation process, thereby affecting the mechanical properties of the steel pipe. At...

Claims

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Application Information

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IPC IPC(8): B21B45/02
CPCB21B45/0215B21B45/0233B21B2045/0227B21B2201/06Y02P70/10
Inventor 康健袁国李振垒王黎筠王国栋
Owner NORTHEASTERN UNIV
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