CN104988446A - Galvanizing method for improving surface quality of hot galvanized plate - Google Patents
Galvanizing method for improving surface quality of hot galvanized plate Download PDFInfo
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- CN104988446A CN104988446A CN201510421109.7A CN201510421109A CN104988446A CN 104988446 A CN104988446 A CN 104988446A CN 201510421109 A CN201510421109 A CN 201510421109A CN 104988446 A CN104988446 A CN 104988446A
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Abstract
A galvanizing method for improving the surface quality of a hot galvanized plate comprises the following steps: adding aluminum-containing zinc ingots into a zinc pot to make the Al content in molten zinc reach 0.28-0.45wt%; keeping the molten zinc in the above state for 24h or more when the Fe content in the molten zinc decreases to 0.003-0.002wt%; producing a hot galvanized plate with the surface meeting high requirements; stopping galvanizing when the Al content in the molten zinc decreases to 0.24wt%; and routinely processing. The Al content in the molten zinc is controlled to be 0.28-0.45wt%, so the Fe content is stable in a range of 0.003-0.002wt%, thereby the percent defective of galvanized steel plates reduces to 1-2% from original 15-20%.
Description
Technical field
The present invention relates to a kind of galvanized method of steel plate, belong to a kind of galvanized method that can improve heat zinc coating plate surface quality particularly.
Background technology
Along with the develop rapidly of Hyundai Motor technique, China has become the large automobile production of the first in the world and country of consumption, day by day increases both at home and abroad to cold rolled automobile sheet demand.Heat zinc coating plate is widely used in body of a motor car because of features such as its beautiful appearance, the mechanical property that coating is even, good, excellent coatings.Along with the continuous progress of production technique, the automobile exterior panel surface quality requirements that motor corporation supplies Iron And Steel Company is also more and more higher, do not allow belt steel surface to there is the defects such as small zinc granule cadmia, these all control to propose more and more higher challenge to automobile exterior panel actual production.
In current hot dip galvanizing automobile exterior panel production process, because zinc liquid temperature in zinc pot is up to about 460 DEG C, enter with steel the iron that zinc pot inevitably exists surface of steel plate afterwards to dissolve in zinc liquid, simultaneously because washing section of galvanized set is difficult to remaining for belt steel surface iron powder to clean up completely, belt steel surface always exists certain residual, and zinc pot iron level therefore all can be caused to increase.Iron level height can cause tiny zinc granule, cadmia defect are formed and easily stick to belt steel surface, finally causes surface imperfection.Generally speaking, if iron level controls below 0.010% in current hot dip galvanizing automobile plate production process, then zinc granule defect probability of occurrence is little, and zinc granule class defect size size is also little.If zinc pot iron level is 0.010% or higher, then zinc particle size is large, and probability of occurrence also can be higher, can cause automobile factory's high repair rate, and this is all unacceptable result of Iron And Steel Company and motor corporation.
Summary of the invention
The present invention is directed to the deficiency that prior art exists, there is provided a kind of content by controlling aluminium in zinc liquid to make at 0.28 ~ 0.45wt% iron level be stabilized in 0.003 ~ 0.002wt%, thus make the percent defective of steel plate galvanized be reduced to the galvanized method that can improve heat zinc coating plate surface quality of 1 ~ 2% by original 15 ~ 20%.
Realize the measure of above-mentioned purpose:
A galvanized method for heat zinc coating plate surface quality can be improved, its step:
1) at zinc pot temperature is 450 ~ 470 DEG C, add containing the zinc ingot metal of aluminium at 6 ~ 8.5wt% in zinc pot, add-on is to make Al content in zinc liquid at 0.28 ~ 0.45wt% for principle;
2) to add containing aluminium at the zinc ingot metal of 0.39 ~ 0.55wt% in zinc liquid, make Al content in zinc liquid at 0.28 ~ 0.45wt%; When Fe content in zinc liquid is down to 0.003 ~ 0.002wt%, keep in this case being not less than 24 hours, the Al content maintenance in this process in zinc liquid is stablized constant;
3) start to produce surperficial high request heat zinc coating plate;
4) when the Al content in zinc liquid is down to 0.24wt%, stop zinc-plated;
5) routine carries out rear operation.
It is: for the Fe content in zinc liquid is down to 0.003 ~ 0.002wt%, adjusts containing aluminium by adding at the zinc ingot metal of 0.25 ~ 0.55wt%.
It is: the Al content in zinc liquid progressively drops to 0.24wt% containing aluminium at the zinc ingot metal of 0.25 ~ 0.55wt% by adding, and when aluminium content is down to 0.24%, stops surperficial high request pot galvanize outside plate to produce.
For realizing object of the present invention; pass through great many of experiments; propose the aluminium content technique in a kind of control galvanizing process zinc liquid completely newly; namely the iron level that can greatly reduce in zinc liquid is adopted; suppress the formation of zinc granule or cadmia defect; reduce the probability of occurrence of zinc granule defect, improve hot dip galvanizing automobile exterior panel surface quality, improve zinc-plated auto sheet conforming product rate.
The present invention controls iron level reason: through experimental studies have found that, affect the zinc granule defect of strip surface quality, its essence is because the iron level dissolved in zinc liquid is too high, namely the solubleness of zinc liquid is exceeded and in hypersaturated state, in the iron that supersaturation is separated out and zinc liquid, aluminium or zinc react and forms the dystectic zinc-iron aluminum compound of high rigidity.When aluminium content controls at 0.28-0.45%, then the iron in zinc liquid can greatly reduce, and be namely reduced to 0.003-0.002%, the reduction of its iron level is fundamentally eliminated or greatly inhibit zinc granule formation condition, thus greatly reduces the generation of zinc granule defect; Also coating adhesion can not be caused not conform to simultaneously, and form other new surface imperfection.
The present invention compared with prior art, makes iron level be stabilized in 0.003 ~ 0.002wt% by the content controlling aluminium in zinc liquid at 0.28 ~ 0.45wt%, thus makes the percent defective of steel plate galvanized be reduced to 1 ~ 2% by original 15 ~ 20%.
Embodiment
Below the present invention is described in detail:
Embodiment 1
A galvanized method for heat zinc coating plate surface quality can be improved, its step:
1) at zinc pot temperature is 462 DEG C, add containing the zinc ingot metal of aluminium at 8wt% in zinc pot, add-on is promoted to 0.45wt% for principle to make the Al content in zinc liquid;
2) in zinc liquid, interpolation contains aluminium at the zinc ingot metal of 0.42wt%, makes the Al content in zinc liquid remain on 0.45wt%; Treat that the Fe content in zinc liquid is reduced to 0.002-0.003wt% scope, when being about to 0.0023 wt%, keep in this case stablizing and keeping 24 hours; Al content now in zinc liquid is 0.45wt%;
3) start to produce high surface requirements hot dip galvanizing automobile exterior panel;
4) when the Al content in zinc liquid is down to 0.24wt%, stop zinc-plated;
5) routine carries out rear operation.
Through statistics, adopt the automobile exterior panel that above-mentioned operation is produced, percent defective near 1.3%, and meet the requirement of automobile exterior panel high-end customer to the surface quality of zine plate completely.
Embodiment 2
A galvanized method for heat zinc coating plate surface quality can be improved, its step:
1) at zinc pot temperature is 450 DEG C, add containing the zinc ingot metal of aluminium at 8wt% in zinc pot, add-on is promoted to 0.28wt% for principle to make the Al content in zinc liquid;
2) in zinc liquid, interpolation contains aluminium at the zinc ingot metal of 0.45wt%, makes the Al content in zinc liquid remain on 0.28wt%; Treat that the Fe content in zinc liquid is reduced to 0.002-0.003wt% scope, when being about to 0.0028 wt%, keep in this case stablizing and keeping 48 hours; Al content now in zinc liquid is 0.28wt%;
3) start to produce high surface requirements hot dip galvanizing automobile exterior panel;
4) when the Al content in zinc liquid is down to 0.24wt%, stop zinc-plated;
5) routine carries out rear operation.
Through statistics, adopt the automobile exterior panel that above-mentioned operation is produced, the near 1..06% of percent defective, and meet the requirement of automobile exterior panel high-end customer to the surface quality of zine plate completely.
Embodiment 3
A galvanized method for heat zinc coating plate surface quality can be improved, its step:
1) at zinc pot temperature is 468 DEG C, add containing the zinc ingot metal of aluminium at 8wt% in zinc pot, add-on is promoted to 0.38wt% for principle to make the Al content in zinc liquid;
2) in zinc liquid, interpolation contains aluminium at the zinc ingot metal of 0.42wt%, makes the Al content in zinc liquid remain on 0.38wt%; Treat that the Fe content in zinc liquid is reduced to 0.002-0.003wt% scope, when being about to 0.0021 wt%, keep in this case stablizing and keeping 72 hours; Al content now in zinc liquid is 0.38wt%;
3) start to produce high surface requirements hot dip galvanizing automobile exterior panel;
4) when the Al content in zinc liquid is down to 0.24wt%, stop zinc-plated;
5) routine carries out rear operation.
Through statistics, adopt the automobile exterior panel that above-mentioned operation is produced, percent defective near 1.7%, and meet the requirement of automobile exterior panel high-end customer to the surface quality of zine plate completely.
Embodiment 4
A galvanized method for heat zinc coating plate surface quality can be improved, its step:
1) at zinc pot temperature is 465 DEG C, add containing the zinc ingot metal of aluminium at 8wt% in zinc pot, add-on is promoted to 0.40wt% for principle to make the Al content in zinc liquid;
2) in zinc liquid, interpolation contains aluminium at the zinc ingot metal of 0.36wt%, makes the Al content in zinc liquid remain on 0.40wt%; Treat that the Fe content in zinc liquid is reduced to 0.002-0.003wt% scope, when being about to 0.0026 wt%, keep in this case stablizing and keeping 25 hours; Al content now in zinc liquid is 0.40wt%;
3) start to produce high surface requirements hot dip galvanizing automobile exterior panel;
4) when the Al content in zinc liquid is down to 0.24wt%, stop zinc-plated;
5) routine carries out rear operation.
Through statistics, adopt the automobile exterior panel that above-mentioned operation is produced, the near 1..63% of percent defective, and meet the requirement of automobile exterior panel high-end customer to the surface quality of zine plate completely.
Embodiment 5
A galvanized method for heat zinc coating plate surface quality can be improved, its step:
1) at zinc pot temperature is 460 DEG C, add containing the zinc ingot metal of aluminium at 8wt% in zinc pot, add-on is promoted to 0.30wt% for principle to make the Al content in zinc liquid;
2) in zinc liquid, interpolation contains aluminium at the zinc ingot metal of 0.37wt%, makes the Al content in zinc liquid remain on 0.30wt%; Treat that the Fe content in zinc liquid is reduced to 0.002-0.003wt% scope, by when having arrived 0.0022wt%, keep in this case stablizing and keeping 35 hours; Al content now in zinc liquid is 0.30wt%;
3) start to produce high surface requirements hot dip galvanizing automobile exterior panel;
4) when the Al content in zinc liquid is down to 0.24wt%, stop zinc-plated;
5) routine carries out rear operation.
Through statistics, adopt the automobile exterior panel that above-mentioned operation is produced, the near 1..95% of percent defective, and meet the requirement of automobile exterior panel high-end customer to the surface quality of zine plate completely.
Embodiment 6
A galvanized method for heat zinc coating plate surface quality can be improved, its step:
1) at zinc pot temperature is 458 DEG C, add containing the zinc ingot metal of aluminium at 8wt% in zinc pot, add-on is promoted to 0.33wt% for principle to make the Al content in zinc liquid;
2) in zinc liquid, interpolation contains aluminium at the zinc ingot metal of 0.35wt%, makes the Al content in zinc liquid remain on 0.33wt%; Treat that the Fe content in zinc liquid is reduced to 0.002-0.003wt% scope, when being about to 0.0024 wt%, keep in this case stablizing and keeping 30 hours; Al content now in zinc liquid is 0.33wt%;
3) start to produce high surface requirements hot dip galvanizing automobile exterior panel;
4) when the Al content in zinc liquid is down to 0.24wt%, stop zinc-plated;
5) routine carries out rear operation.
Through statistics, adopt the automobile exterior panel that above-mentioned operation is produced, the near 1..5% of percent defective, and meet the requirement of automobile exterior panel high-end customer to the surface quality of zine plate completely.
Embodiment 7
A galvanized method for heat zinc coating plate surface quality can be improved, its step:
1) at zinc pot temperature is 455 DEG C, add containing the zinc ingot metal of aluminium at 8wt% in zinc pot, add-on is promoted to 0.42wt% for principle to make the Al content in zinc liquid;
2) in zinc liquid, interpolation contains aluminium at the zinc ingot metal of 0.43wt%, makes the Al content in zinc liquid remain on 0.42wt%; Treat that the Fe content in zinc liquid is reduced to 0.002-0.003wt% scope, when being about to 0.0029 wt%, keep in this case stablizing and keeping 29 hours; Al content now in zinc liquid is 0.42wt%;
3) start to produce high surface requirements hot dip galvanizing automobile exterior panel;
4) when the Al content in zinc liquid is down to 0.24wt%, stop zinc-plated;
5) routine carries out rear operation.
Through statistics, adopt the automobile exterior panel that above-mentioned operation is produced, the near 1..45% of percent defective, and meet the requirement of automobile exterior panel high-end customer to the surface quality of zine plate completely.
This embodiment is only the best and exemplifies, the restricted enforcement not to technical solution of the present invention.
Claims (3)
1. can improve a galvanized method for heat zinc coating plate surface quality, its step:
1) at zinc pot temperature is 450 ~ 470 DEG C, add containing the zinc ingot metal of aluminium at 6 ~ 8.5wt% in zinc pot, add-on is to make Al content in zinc liquid at 0.28 ~ 0.45wt% for principle;
2) to add containing aluminium at the zinc ingot metal of 0.39 ~ 0.55wt% in zinc liquid, make Al content in zinc liquid at 0.28 ~ 0.45wt%; When Fe content in zinc liquid is down to 0.003 ~ 0.002wt%, keep in this case being not less than 24 hours, the Al content maintenance in this process in zinc liquid is stablized constant;
3) start to produce surperficial high request heat zinc coating plate;
4) when the Al content in zinc liquid is down to 0.24wt%, stop zinc-plated;
5) routine carries out rear operation.
2. a kind of galvanized method that can improve heat zinc coating plate surface quality as claimed in claim 1, is characterized in that: for the Fe content in zinc liquid is down to 0.003 ~ 0.002wt%, adjusts containing aluminium by adding at the zinc ingot metal of 0.25 ~ 0.55wt%.
3. a kind of galvanized method that can improve heat zinc coating plate surface quality as claimed in claim 1, it is characterized in that: the Al content in zinc liquid progressively drops to 0.24wt% containing aluminium at the zinc ingot metal of 0.25 ~ 0.55wt% by adding, when aluminium content is down to 0.24%, surperficial high request pot galvanize outside plate is stopped to produce.
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| CN201510421109.7A CN104988446A (en) | 2015-07-17 | 2015-07-17 | Galvanizing method for improving surface quality of hot galvanized plate |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106399888A (en) * | 2016-10-24 | 2017-02-15 | 唐山钢铁集团有限责任公司 | Operation method for galvanizing zinc purification |
| CN107988572A (en) * | 2017-12-07 | 2018-05-04 | 武汉钢铁有限公司 | The quick method for removing bottom ash in zinc pot |
| CN108796415A (en) * | 2018-07-25 | 2018-11-13 | 武汉钢铁有限公司 | The high alumina ingredient control method of hot-dip galvanized pan |
| CN111882030A (en) * | 2020-06-29 | 2020-11-03 | 武汉钢铁有限公司 | Ingot adding strategy method based on deep reinforcement learning |
| CN113755776A (en) * | 2021-09-09 | 2021-12-07 | 新疆八一钢铁股份有限公司 | Method for switching ultrathin coating hot galvanizing liquid on line |
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| CN102581007A (en) * | 2012-01-19 | 2012-07-18 | 武汉钢铁(集团)公司 | Method for producing steel for automotive outer plate with width of 2,000-2,070mm |
| CN103498095A (en) * | 2013-10-22 | 2014-01-08 | 武汉钢铁(集团)公司 | Low-cost corrosion resistant color coated sheet used for lift and production method thereof |
| CN103572190A (en) * | 2013-09-24 | 2014-02-12 | 河北钢铁股份有限公司唐山分公司 | Treatment method for purifying zinc pot in hot galvanizing production |
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2015
- 2015-07-17 CN CN201510421109.7A patent/CN104988446A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102581007A (en) * | 2012-01-19 | 2012-07-18 | 武汉钢铁(集团)公司 | Method for producing steel for automotive outer plate with width of 2,000-2,070mm |
| CN103572190A (en) * | 2013-09-24 | 2014-02-12 | 河北钢铁股份有限公司唐山分公司 | Treatment method for purifying zinc pot in hot galvanizing production |
| CN103498095A (en) * | 2013-10-22 | 2014-01-08 | 武汉钢铁(集团)公司 | Low-cost corrosion resistant color coated sheet used for lift and production method thereof |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106399888A (en) * | 2016-10-24 | 2017-02-15 | 唐山钢铁集团有限责任公司 | Operation method for galvanizing zinc purification |
| CN107988572A (en) * | 2017-12-07 | 2018-05-04 | 武汉钢铁有限公司 | The quick method for removing bottom ash in zinc pot |
| CN108796415A (en) * | 2018-07-25 | 2018-11-13 | 武汉钢铁有限公司 | The high alumina ingredient control method of hot-dip galvanized pan |
| CN108796415B (en) * | 2018-07-25 | 2020-07-14 | 武汉钢铁有限公司 | High-aluminum component control method for hot-dip galvanizing zinc pot |
| CN111882030A (en) * | 2020-06-29 | 2020-11-03 | 武汉钢铁有限公司 | Ingot adding strategy method based on deep reinforcement learning |
| CN111882030B (en) * | 2020-06-29 | 2023-12-05 | 武汉钢铁有限公司 | Ingot adding strategy method based on deep reinforcement learning |
| CN113755776A (en) * | 2021-09-09 | 2021-12-07 | 新疆八一钢铁股份有限公司 | Method for switching ultrathin coating hot galvanizing liquid on line |
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Effective date of registration: 20170714 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Applicant after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Applicant before: Wuhan Iron & Steel (Group) Corp. |
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