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

Coiling method for preventing hot rolling strip steel from being flatly coiled

A technology of hot-rolled strip steel and flat coil, which is applied in the field of hot-rolled strip steel coiling, can solve problems such as flat coil, achieve no additional cost, be easy to implement, and improve the effect of flat coil problems

Active Publication Date: 2012-02-01
BAOSHAN IRON & STEEL CO LTD
View PDF9 Cites 32 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for preventing the coiling of hot-rolled strip steel flat coils, so as to solve the problem of steel coils accompanied by bainite or martensitic phase transformation in the cooling process of advanced high-strength steel after coiling in the hot-rolling process. flat roll problem

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
  • Coiling method for preventing hot rolling strip steel from being flatly coiled
  • Coiling method for preventing hot rolling strip steel from being flatly coiled
  • Coiling method for preventing hot rolling strip steel from being flatly coiled

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] High-strength weathering steel, the thickness of the strip steel is from 2mm to 4mm, the weight percentage of the chemical composition of the strip steel is shown in Table 1, and the remainder is Fe and unavoidable impurities.

[0029]Table 1: The weight percentage table (unit: %) of the chemical composition of steel strip

[0030] C

Si

mn

P

S

N

Mo

Ti

Cr

Cu

Nb

0.146

0.48

1.50

0.011

0.0037

0.0053

0.2

0.04

0.98

0.49

0.15

[0031] According to the coiling method of the present invention, the coiling temperature is controlled at 550±10° C., the cooling rate is to decrease by 30° C. per second, and stay for 0, 20, 30, 40 and 60 seconds respectively after coiling.

[0032] figure 2 It is the statistical result of the steel coil flat coil degree and the reel residence time relation that embodiment 1 coiling method coils, as figure 2 As show...

Embodiment 2

[0036] High-strength and high-manganese steel, strip thickness 2.82mm ~ 3.02mm, the weight percentage of the chemical composition of the strip is shown in Table 2, the remainder is Fe and unavoidable impurities.

[0037] Table 2: The weight percentage table (unit: %) of the chemical composition of strip steel

[0038] C

Si

mn

P

S

N

Ti

Cr

Mo

Nb

0.98

1.46

2.97

0.009

0.002

0.0046

0.15

0.2

0.8

0.09

[0039] According to the coiling method of the present invention, the coiling temperature is controlled at 590±10° C., the cooling rate is to drop 20° C. per second, and stay for 50 seconds after coiling.

[0040] image 3 It is the statistical result of the flat coil degree of the strip steel coil in embodiment 2 and the flat coil degree of the strip steel coil not implementing the present invention. Such as image 3 As shown, there are 45 volumes of steel co...

Embodiment 3

[0042] High-strength cold-rolled martensitic steel hot-rolled coils, strip thickness 2.82mm, the weight percentage of the chemical composition of the strip is shown in Table 3, and the remainder is Fe and unavoidable impurities.

[0043] Table 3: The weight percentage table (unit: %) of the chemical composition of steel strip

[0044] C

Si

mn

P

S

N

Ti

0.132

0.36

1.03

0.011

0.0059

0.0029

0.05

[0045] According to the coiling method of the present invention, the coiling temperature is controlled at 510±10° C., the cooling rate is to decrease by 40° C. per second, and stay for 30 seconds after coiling.

[0046] Figure 4 It is the statistical result of the strip steel coil flat coil degree of embodiment 3 and the strip steel coil flat coil degree not implementing the present invention, as Figure 4 As shown, there are 40 coils without implementing the present invention, of which 35 coi...

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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention discloses a coiling method for preventing hot rolling strip steel from being flatly coiled. The coiling method comprises two stages: the first stage: the strip steel is rolled from a finishing mill and then cooled through laminar flow and enters a coiling machine for coiling to obtain a steel coil, wherein the coiling temperature is 500-600 DEG C; and the second stage: the coiled steel coil is remained for 20-60s on a coiling machine mandrel. The coiling method for preventing the hot rolling strip steel from being flatly coiled can effectively improve the flat-coiling problem generated after the hot rolling strip steel is coiled, and has the advantages of easiness in implementation, no additional cost and remarkable effect.

Description

technical field [0001] The invention relates to a hot-rolled steel strip coiling method, in particular to a coiling method for preventing the hot-rolling process of advanced high-strength steel (AHSS, Advanced High Strength Steel) steel flat coil. Background technique [0002] In the hot rolling production process of strip steel, after the strip steel is coiled into steel coils, the phenomenon of flat coil (or called "collapse") sometimes occurs. It is manifested that the entire steel coil changes from a cylindrical shape at the end of coiling to an elliptical cylindrical shape, and cannot enter the subsequent cold rolling and annealing process. Even if some steel coils with less serious flat coils can be barely loaded into the cold rolling mill, the irregular shape will cause excessive vibration of the stand during cold rolling or excessive fluctuation of rolling force. Such coils need to be recoiled on a hot rolling line before they can be cold rolled. This has just seri...

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 Applications(China)
IPC IPC(8): B21C47/02
Inventor 钟勇何晓明王利冯伟骏杜林
Owner BAOSHAN 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