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
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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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