Winding method for preventing flat roll of hot rolled steel strip

A technology for hot-rolled steel and flat coils, which is applied in the field of hot-rolled steel strip coiling and can solve problems such as flat coils

Inactive Publication Date: 2006-07-26
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of coiling method that prevents hot-rolled steel strip flat coil, so that solve steel strip carbon content (Wt%) when greater than 0.25, and the flat coil that occurs in the process of adopting horizontal output steel coil question

Method used

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  • Winding method for preventing flat roll of hot rolled steel strip
  • Winding method for preventing flat roll of hot rolled steel strip
  • Winding method for preventing flat roll of hot rolled steel strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: with production chemical composition (Wt%) C: 0.62~0.70; Si: 0.17~0.37; Mn: 0.90~1.20; P≤0.035; S≤0.040; Cr≤0.25; Ni≤0.25; Cu≤0.25 ; The rest is Fe and unavoidable impurities 65Mn thin coil as an example, the chemical composition of some furnace numbers is shown in Table 1, and the specifications of the rolled coil are shown in Table 2. The thinnest specification is 2.0mm, and the thickest specification is 4.0mm.

[0012] Table 1: 65Mn Coil Chemical Composition Wt%

[0013]

[0014]

Volume number

specification, mm

coiling temperature

℃

flat roll case

Volume number

specification, mm

coiling temperature

℃

flat roll case

6179502010

3.0×1250

609

flat roll

6223502010

4.0×1200

724

none

6179502020

3.0×1250

680

none

6223502020

4.0×1200

689

none

...

Embodiment 2

[0017] Embodiment 2: with production chemical composition (Wt%) C: 0.26~0.34; Si: 0.20~0.40; Mn: 0.40~0.70; P≤0.040; S≤0.040; Cu≤0.30; : 0.15~0.25 30CrMo thin coils with Fe and unavoidable impurities are taken as an example. The thinnest specification is 2.15mm, and the thickest specification is 4.40mm.

[0018] Table 3: 30CrMo Coil Chemical Composition Wt%

[0019]

[0020] Furnace No.

[0021] From the steel manual, the phase transition temperature A of 30CrMo steel is r1 According to the coiling method of the present invention, the coiling temperature is controlled within the range of 683°C to 753°C, and the optimum coiling temperature is 703 to 723°C. It can be seen from the data in Table 4 that flat coiling does not occur when the coiling temperature is controlled within the range of 683°C to 753°C, but flat coiling occurs when the coiling temperature is lower than 683°C.

Embodiment 3

[0022] Embodiment 3: with production chemical composition (Wt%) C: 0.42~0.50; Si: 0.17~0.37; Mn: 0.50~0.80; P≤0.035; S≤0.040; Cr≤0.25; Ni≤0.25; Cu≤0.25 ; The rest is 45% of Fe and unavoidable impurities # Take thin coils as an example, the chemical composition of some furnace numbers is shown in Table 5, and the specifications, coiling temperature and flat coils of the rolled coils are shown in Table 6. The thinnest specification is 2.0mm and the thickest is 6.0mm.

[0023] Table 5: 45 # Coil Chemical Composition Wt%

[0024]

[0025] Coil No.

Rolling specifications (thick mm)

Average coiling temperature (℃)

flat roll case

7380102100

2.0×1000

668

flat roll

6410603030

3.0×1300

666

flat roll

6410604010

3.0×1250

654

flat roll

6389801020

2.0×1000

720

none

6410303010

6.0×1250

740

none

6410304010

...

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Abstract

The present invention is winding method for hot rolled steel strip. The steel strip from finishing rolling mill with carbon content over 0.25 wt% and via laminar flow cooling is wounded with a winding machine, and the winding temperature is controlled in Ar1+ -10 deg.c to Ar1+60 deg.c, so that the steel strip produce phase change from the outer layer and the core layer contacting the winding tube to the middle layer gradually. During the coil cooling process, the expansion caused by phase change and the contraction caused by cooling are counteracted mutually, and the inner layer and the outer layer support each other, so that no side crisp takes place. The present invention has simple thought, convenient operation and obvious effect.

Description

technical field [0001] The invention belongs to a hot-rolled steel strip coiling technology, in particular to a coiling method for preventing flat coiling when the coil is transported horizontally after the hot-rolled steel strip with a carbon content (Wt%) greater than 0.25 is coiled . Background technique [0002] When producing hot-rolled steel strip, if the carbon content (Wt%) of the steel strip is greater than 0.25 and the thickness is less than 5.0mm, and the coil is transported horizontally on the transportation line after it is unloaded from the coiler, then The phenomenon of flat coil (also known as "collapsed coil") often occurs, and the entire steel coil becomes an elliptical cylinder, which cannot be opened flat for use, resulting in waste products. The solution that is often used now is to reduce the coiling temperature to increase the strength of the steel during coiling and reduce the deformation of the steel coil after coiling. For steel types with low car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C47/02
Inventor 侯华兴沙孝春张万山杨旭关菊孙大庆张宇清王道远吴晓伟张鹏远杨大军
Owner ANGANG STEEL CO LTD
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