Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A laminar flow cooling process for hot-rolled strip steel

A laminar flow cooling and hot-rolled strip technology, applied in metal rolling, manufacturing tools, metal rolling, etc., can solve the problems affecting the uniformity of performance and plate shape, ineffective purging, coiler biting and slipping, etc. , to achieve the effect of product performance control, ingenious design, and improvement of toughness index

Active Publication Date: 2017-11-17
SHANGHAI MEISHAN IRON & STEEL CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention is aimed at the technical problems existing in the prior art, and provides a laminar flow cooling process for hot-rolled strip steel, which solves the coiler bite caused by the high / low temperature of the head through the hot head / cold head process. In order to solve the problem of slippage, the hot head process solves the problem that some steel types cannot be effectively purged by laminar water, which affects the uniformity of performance and plate shape, and the quality of strip steel is effectively guaranteed.

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
  • A laminar flow cooling process for hot-rolled strip steel
  • A laminar flow cooling process for hot-rolled strip steel
  • A laminar flow cooling process for hot-rolled strip steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: see figure 1 — Figure 9 , a hot-rolled steel strip laminar cooling process, the method steps are as follows,

[0048] (1) Optimize a linear laminar flow temperature curve into a dynamically variable five-section control curve like a "boat shape", as follows: the first section is the hot head section, the length L1 is 10-100m, the second section is the hot section The head transition section, the length L2 is 5-20 m, the third section is the middle section L3 of the strip steel, the fourth section tail transition section, the length L4 is 5-20m, the fifth section is the hot tail section, the length L5 is 10- 100m; the cooling temperature of the five sections is controlled respectively: the middle section is equal to the target coiling temperature, the head section is the target coiling temperature ±0-50°C, the tail section is the target coiling temperature ±0-50°C, the hot head transition section and The thermal tail transition section transitions unifor...

Embodiment 2

[0081] Embodiment 2: the application of cold tail process

[0082] To produce pipeline steel X52 with a thickness of 12.55mm, the quality design requires a coiling temperature of 550±20°C. In the actual production process, due to the thicker finished product thickness of 12.55mm, the slower rolling speed of 130mpm, and the shorter finished product length of 120-160m, the CTC model is not capable of controlling the CT of the tail of the strip, and the coiling temperature suddenly rises at the tail of 50-60m. To the tail 20-30m coiling temperature rises to 590-610 ℃, such as Figure 11 , causing the X52 coiling temperature control to exceed the standard, and the mechanical properties and anti-HIC performance are inconsistent. The technical scheme adopted is as follows:

[0083] 1. According to the analysis, there are fluctuations in the coiling temperature, which affect the performance of the steel coil. The comparison found that the coil temperature of the first half was bas...

Embodiment 3

[0092] Embodiment 3: the application of thermal tail technology

[0093] When producing H-Q195 with a thickness of 2.3mm, the laminar flow water at the tail cannot be cleaned smoothly, resulting in uneven cooling and poor plate shape. On-site tracking confirmed that due to the high velocity of the tail and the large amount of laminar water, normal purge cannot clean the laminar water on the surface. According to the analysis, it can be improved through the hot tail process. According to the field test tracking, L5=40 meters is determined according to the distance from the last stand of the finishing rolling to the first set of laminar water opening. Under the worst conditions, an increase of 30°C can basically ensure that the purge is clean. It is determined that the length of L3 is 10 meters, the length of L4 is 40 meters, and the effect is good when T2 is 40°C. After the implementation, the water accumulation at the end of the strip steel has been controlled, and the user ...

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 proposes a laminar flow temperature hot head and hot tail control method, which optimizes a linear laminar flow temperature curve into a dynamically variable five-segment control curve like a "boat shape". The set temperature and length of each section can be adjusted and optimized according to the actual performance of the head and tail of the strip and / or the actual length of the historical temperature curve; through the hot head / cold head process, the problems caused by the high / low temperature of the head are solved The problem of biting and slipping of the coiler is solved through the hot head technology, which solves the problem that the laminar water of some steel types cannot be effectively purged, which affects the uniformity of performance and the shape of the strip, and the quality of the strip is effectively guaranteed.

Description

technical field [0001] The invention relates to a cooling process, in particular to a laminar flow cooling process for hot-rolled strip steel, and belongs to the technical field of laminar flow cooling control for hot-rolled strip steel. Background technique [0002] The coiling temperature of hot-rolled strip steel is an important parameter to control the performance index of hot-rolled strip steel. Modern hot strip mills generally adopt laminar cooling to control the post-rolling cooling rate and coiling temperature of the strip, so that the strip can obtain good microstructure and mechanical properties. The structure and performance of the product can be stable only if the laminar flow cooling process ensures good cooling uniformity and high coiling temperature control accuracy. From the point of view of control, the laminar flow cooling system of hot rolling is a complex industrial process of continuous production with multiple parameters, nonlinearity, large lag and st...

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): B21B45/02B21B37/74
Inventor 李欣波王宁宁
Owner SHANGHAI MEISHAN IRON & STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com