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Method for reducing yield platform

A yield platform and electric plate technology, applied in coating, metal material coating process, hot dip plating process, etc., can solve the problems of long yield platform length, affecting the quality of galvanized low carbon home appliance plate, etc., and reduce the yield plate , the effect of improving quality

Pending Publication Date: 2022-04-26
ANYANG IRON & STEEL GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the existing production process of galvanized low-carbon home appliance panels, the length of the yield platform is relatively large, which affects the quality of galvanized low-carbon home appliance panels

Method used

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  • Method for reducing yield platform
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  • Method for reducing yield platform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] This example presents a method for reducing the yield plateau by controlling the chemical composition.

[0022] The first example of this example: by selecting 20 rolls of low-carbon home appliance panels with different carbon contents, including 8 rolls of DX52D+Z and 12 rolls of DX51D+Z, the length of the yield platform and the yield platform are compared after the production of the continuous hot-dip galvanizing unit Eliminate the situation and determine the influence of carbon content changes on the yield plateau of galvanized appliance panels. The specific experimental data are shown in Table 1:

[0023]

[0024] Table 1

[0025] It can be seen from Table 1 that the length of the yield platform of the steel coil with lower carbon content is shorter, and the tensile test shows that the steel coil with RP0.2 (that is, the steel coil with no obvious yield platform on the tensile curve) has lower carbon content.

[0026] Second: Select 20 rolls of low-carbon home ...

Embodiment 2

[0033] This embodiment provides a method for reducing the yield plateau by adjusting the hot rolling process.

[0034] In this example, 23 coils of DC51D+Z-JD test coils were selected, and the hot-rolled coiling temperature of 13 coils was adjusted to 710°C, and the coiling temperature of the other 10 coils remained unchanged. The length of the platform and the elimination of the yield platform, the specific experimental data are shown in Table 3:

[0035]

[0036] table 3

[0037] It can be seen from Table 3 that the yield platform of the coils with a coiling temperature of 600-620°C has not been eliminated, and the elimination rate of the yield platform of the coils with a coiling temperature of about 710°C is 72.7%, and the length of the yield platform is ≤3%. Therefore, the increase of the hot-rolled coiling temperature can increase the elimination rate of the yield plateau and shorten the length of the yield plateau on the tensile curve. In summary, the hot-rolled coi...

Embodiment 3

[0039] This example presents a method for reducing the yield plateau by changing the reduction ratio of cold rolling.

[0040] In this example, 20 volumes of DC51D+Z-JD test volumes were selected, among which the cold rolling reduction rate of 10 coils was set at 85.7%, and the cold rolling reduction rate of 10 coils was set at 87.3%. The length of the yield platform and the elimination of the yield platform of the steel coils with different cold rolling reduction ratios are compared. The specific experimental data are shown in Table 4:

[0041]

[0042] Table 4

[0043] It can be seen from Table 4 that the 10 rolls of DC51D+Z-JD test rolls with a cold rolling reduction rate of 85.7% have a yield platform elimination rate of 30%, and the 10 rolls of DC51D+Z-JD test rolls with a cold rolling reduction rate of 87.3% The volume yield platform elimination rate was 60%.

[0044] To sum up, after continuous cold rolling of strips with different cold rolling reductions, the defo...

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Abstract

The invention discloses a method for reducing a yield platform, which comprises the following steps of: reducing the yield platform by controlling chemical components, reducing the yield platform by adjusting a hot rolling process, reducing the yield platform by changing a cold rolling reduction rate, reducing the yield platform by adjusting the annealing temperature of a galvanizing unit, and reducing the yield platform by adjusting the elongation of a finishing machine. Through the five aspects, the production process of the galvanized low-carbon household appliance plate is adjusted, the yield platform of the galvanized low-carbon household appliance plate is greatly lowered, and the quality of the galvanized low-carbon household appliance plate is improved.

Description

technical field [0001] The invention belongs to the technical field of production of galvanized low-carbon home appliance boards, in particular to a method for reducing the yield platform. Background technique [0002] Galvanized low-carbon home appliance sheet is a galvanized sheet made of low-carbon steel, and during the stretching of low-carbon steel, some small-sized interstitial atoms, such as C, H, O, N, etc., will gather on the dislocation line Underneath, a Coriolis air mass is formed, which has a pinning effect on the dislocation line, so the deformed material can only break away from the pinning and start to move under the action of a relatively high stress, so that an upper yield point is generated on the stress-strain curve , that is, a platform is formed. When the dislocation line is unpinned, the stress will drop suddenly, and then the upper yield point will appear. Once the dislocation line breaks free from the pinning of the Coriolis air mass, it will continu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/02C21D1/26C23C2/06C23C2/40C23C2/26C22C38/00
CPCC21D8/0226C21D8/0236C21D1/26C23C2/06C23C2/40C23C2/26C22C38/00
Inventor 向华厚健龙程官江欧阳瑜黄重王新志刘伟云李堃成晓举于永业
Owner ANYANG IRON & STEEL GRP
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