An ultra-fast cooling process and coiling method for ultra-thick gauge hot-rolled coils

An ultra-fast cooling and hot-rolled coil technology, applied in the ultra-fast cooling process and coiling, steel plate rolling field, can solve the problems of few hot-rolled coils, etc., to improve coiling stability, no additional cost, improve The effect of tissue uniformity

Active Publication Date: 2017-08-11
NORTHEASTERN UNIV LIAONING
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few reports on the production of X70 hot-rolled coils with ultra-thick specifications (25.4mm) at home and abroad

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • An ultra-fast cooling process and coiling method for ultra-thick gauge hot-rolled coils
  • An ultra-fast cooling process and coiling method for ultra-thick gauge hot-rolled coils
  • An ultra-fast cooling process and coiling method for ultra-thick gauge hot-rolled coils

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Taking the pipeline steel strip X70 with a thickness of 25.4mm as an example, such as figure 1 As shown, the strip steel 6 passes through 3 sets of ultra-fast cooling headers, and the total flow rate of the headers is 7500m 3 / h, the ultra-fast cooling outlet temperature of the strip is cooled to 500-550°C, then air-cooled, the air-cooling time is 2s, and then cooled by a conventional cooling header, the coiling temperature is 400-450°C, and the following is obtained: image 3 The strip steel 6 shown has fine ferrite grains with an average grain size of about 5 μm, thereby ensuring the drop weight performance. figure 2 Intermediate coiler pinch roll 1 guides the strip steel 6, the first coiling aid roll 2, the second coiling aiding roll 3 and the third coiling aiding roll 4 are equidistantly arranged on the outer circumference of the coiler drum 5, 25.4mm thick X70 pipeline The strip steel 6 enters between the three helper rolls 2-4 and the coiler drum 5 .

[0036]Du...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to an ultra-fast cooling technology of an ultra-thick hot-rolled coil and a coiling method. The ultra-fast cooling technology is characterized by comprising the steps that strip steel which is 25.4 mm thick and has the specification of X70 is rolled through a finishing mill and cooled to 500-550 DEG C through an ultra-fast cooling section, air cooling is conducted for 2 s, and cooling is conducted through a normal layer to reach the coiling temperature ranging from 400 DEG C to 450 DEG C; strip steel head coiling machine pinch roll position control time is 0.03 s, and the strip steel is fixed in advance; the number of coiling turns of the strip steel head is increased to five turns, a wrapper roll makes contact with the strip steel head continuously till a coiling block load torque is 12.66 KN.M, the wrapper roll is opened normally, when the head coils tightly and the strip steel is close to the tail, the pressure of the wrapper roll is increased to 750 KN, and it is guaranteed that the tail strip steel coils stably; the tail-holding time of an ultra-thick strip steel tail wrapper roll is 8-12 s, and the tail strip steel shape is fixed. According to the ultra-fast cooling technology of the ultra-thick hot-rolled coil and the coiling method, the steel coil strength is guaranteed, and the DWTT fracture toughness is effectively improved. The low-temperature coiling temperature of 400-450 DEG C far exceeds the design capacity of equipment coiling this type of steel, and a major breakthrough to the prior art is achieved.

Description

technical field [0001] The invention belongs to the steel plate rolling technology in the field of processing, and in particular relates to an ultra-fast cooling process and a coiling method of an ultra-thick specification X70 hot-rolled coil. Background technique [0002] In order to further improve the efficiency of pipeline transportation, thick-gauge, high-grade steel, and high-pressure transmission have become a trend. From the perspective of pipeline construction and operating costs, thick-gauge welded pipes have a better market prospect. However, in the past, the coiling thickness of the hot-rolled coil production line was usually less than 22mm, and with the increase of the thickness of the steel plate, the unevenness of the surface and core of the hot-rolled coil steel plate increased. This is a technical problem in the development of thick-gauge pipeline steel. It has become a major bottleneck restricting the construction of energy pipelines. On the one hand, the p...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/02
CPCC21D8/02C21D8/0247
Inventor 王学强辛艳辉王凤美江潇徐伟袁国康健李旭东李振垒赵金华王国栋
Owner NORTHEASTERN UNIV LIAONING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap