CN103966537A - Method for controlling zinc flow marks of thick-material thick-coating hot-dip galvanized product - Google Patents
Method for controlling zinc flow marks of thick-material thick-coating hot-dip galvanized product Download PDFInfo
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- CN103966537A CN103966537A CN201410163759.1A CN201410163759A CN103966537A CN 103966537 A CN103966537 A CN 103966537A CN 201410163759 A CN201410163759 A CN 201410163759A CN 103966537 A CN103966537 A CN 103966537A
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- air knife
- thick
- coating
- zinc flow
- controlling
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- 239000011701 zinc Substances 0.000 title claims abstract description 39
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 37
- 238000000576 coating method Methods 0.000 title claims abstract description 31
- 239000011248 coating agent Substances 0.000 title claims abstract description 30
- 239000000463 material Substances 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 230000007547 defect Effects 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000007664 blowing Methods 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 claims description 4
- 238000005246 galvanizing Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005507 spraying Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000012797 qualification Methods 0.000 abstract description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000000137 annealing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Coating With Molten Metal (AREA)
Abstract
The invention relates to the field of hot galvanizing, in particular to a method for controlling zinc flow lines of a thick-material thick-coating hot galvanizing product, which is characterized in that the temperature of a spraying medium is adjusted according to the reason of zinc flow line defects, the cooling capacity of the spraying medium on strip steel is improved, and the technological parameters of an air knife are optimized to achieve the purpose of controlling the zinc flow line defects, wherein the specific parameters are selected as follows: 1) controlling the temperature in the fan chamber to be within the range of 0-10 ℃ before production; 2) optimizing air knife parameters: the distance between the lip of the air knife and the liquid level is 600-1000/mm; the distance between the knife lip of the air knife and the strip steel is 15-30 mm; according to the speed of the unit and the thickness of the coating, the pressure of the air knife is 100-300 mbar. Compared with the prior art, the invention has the beneficial effects that: effectively controls thick materials (not less than 2.0mm) and thick coatings (not less than 220 g/m)2) The surface quality and the qualification rate of the hot-dip galvanized product are improved to 96.2 percent from 90.5 percent before implementation.
Description
Technical field
The present invention relates to pot galvanize field, relate in particular to a kind of method of controlling thick material thickness coating pot galvanize product zinc flow liner.
Background technology
With steel Continuous Hot Dip Galvanizing, conventionally adopt air blast to control the thickness of coating, by air knife, control, air knife is not only the adhesion amount of controlling coating, also be the important equipment that determines product surface quality, in the pot galvanize of air knife method, the principal element that affects galvanized layer thickness has: air pressure, air knife distance, air knife are apart from height, the air knife angle of zinc liquid level.
Band steel arrives the front coating of air knife in liquid state after going out zinc pot, unnecessary zinc liquid flows from top to bottom under action of gravity, the liquid Zn that is bonded at belt steel surface reduces along with the increase with zinc liquid level distance, hinder the temperature that zinc liquid flowing air can reduce coating, the air mixed spraying with air knife after coating arrives air knife position, make to reduce with the liquid Zn on steel, it is carried out to cooling, excessive zinc simultaneously and under airflow function, pile up formation ripple, cooling through mixing air, belt steel surface temperature is down to 419 ℃ and is solidified below, form " zinc ripple ", as shown in Figure 1, this defect refers to the horizontal striped of the outstanding zinc layer occurring at belt steel surface, the length of striped, spacing is not etc., when situation is serious, form the defect that exactly likes water ripples, therefore claim this type of defect for " zinc flow liner ", the coating moire that we often say at ordinary times, zinc rises and falls, zinc projection equalization belongs to this kind of defect, there is difference in severity and configuration of surface just, in fact zinc stream ripple is exactly the inhomogeneous of the longitudinal thickness of coating of belt steel surface, protrusion of surface position touches and has feel with hand, thickness of coating is greater than other position, uneven due to belt steel surface, can have a strong impact on the surface quality with steel, cannot meet the requirement of inspection standard and user's Surface Quality on high-level surface.
General main thick material (>=2.0mm), the thickness coating (>=220g/m of occurring in of zinc flow liner defect
2) on product, the major cause producing is that thick band steel is limited by annealing furnace heating efficiency, process speed is on the low side, and the air pressure needing while producing thickness coating is less than normal, not enough to the cooling power with steel, band steel zinc layer after air knife is completely not cooling, and the core heat energy of thick material is many in addition, the corrugated surface that the coating not solidifying completely slightly flows and forms downwards due to action of gravity in steel uphill process, i.e. so-called " zinc flow liner " defect.
Summary of the invention
The object of this invention is to provide a kind of method of controlling thick material thickness coating pot galvanize product zinc flow liner, control thick material (>=2.0mm), thickness coating (>=220g/m
2) surface quality of pot galvanize product, to meet the demand of user to high surface heat galvanizing production.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of method of controlling thick material thickness coating pot galvanize product zinc flow liner, the reason producing for zinc flow liner defect, adjust the temperature of blowing media, improve blowing media to the cooling power with steel, optimize the processing parameter of air knife simultaneously, to reach the object of controlling zinc flow liner defect, its concrete technology parameter is controlled as follows:
1) producing thickness>=2.0mm, thickness of coating>=220g/m
2product before control temperature in fan house within the scope of 0～10 ℃;
2) optimize air knife parameter: air knife cutter lip is 600～1000/mm apart from liquid level distance; Air knife cutter lip is 15～30mm apart from band steel distance; According to unit speed and thickness of coating, air pressure is adjusted within the scope of 100～300mbar, adjusts principle and is when increasing air knife with distance with steel as far as possible, the pressure of corresponding raising air knife blowing media, add air volume, finally reach and improve the object of air-flow to the cooling power of zinc layer.
Temperature in described fan house is by installing an air-conditioner in air sword blower fan chamber or taking the mode that cold blast engine is blown a cold wind over to realize.
Compared with prior art, beneficial effect of the present invention is: the reason producing for zinc flow liner defect, optimize relevant processing parameter, and effectively controlled thick material (>=2.0mm), thickness coating (>=220g/m
2) surface quality of pot galvanize product, after improving, former kind qualification rate brings up to 96.2% by 90.5% before implementing, and the surface quality of product has had stable raising, has met the demand of user to high surface heat galvanizing production.
Figure of description
Fig. 1 is that zinc flow liner forms schematic diagram.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described:
A kind of method of controlling thick material thickness coating pot galvanize product zinc flow liner of the present invention, it is the reason by producing for zinc flow liner defect, adjust the temperature of blowing media, improve blowing media to the cooling power with steel, improve blowing media to the cooling power with steel, optimize the processing parameter of air knife, to reach the object of controlling zinc flow liner defect, its process parameter control is as follows simultaneously:
1) producing thickness>=2.0mm, thickness of coating>=220g/m
2product before, by installing an air-conditioner in air sword blower fan chamber or taking mode that cold blast engine is blown a cold wind over to control temperature in fan house within the scope of 0～10 ℃;
2) optimize air knife parameter: air knife cutter lip is 600～1000/mm apart from liquid level distance; Air knife cutter lip is 15～30mm apart from band steel distance; According to unit speed and thickness of coating, air pressure is adjusted within the scope of 100～300mbar, facts have proved, the present invention can finally reach and improve the object of air-flow to the cooling power of zinc layer, and then has reduced the generation of zinc flow liner at thick material thickness coating pot galvanize product surface.
For different steel specifications, each embodiment concrete technology parameter is selected to see the following form 1.
Table 1
Claims (2)
1. a method of controlling thick material thickness coating pot galvanize product zinc flow liner, it is characterized in that, the reason producing for zinc flow liner defect, adjust the temperature of blowing media, improve blowing media to the cooling power with steel, optimize the processing parameter of air knife, to reach the object of controlling zinc flow liner defect, its concrete technology parameter is controlled as follows simultaneously:
1) producing thickness>=2.0mm, thickness of coating>=220g/m
2product before control temperature in fan house within the scope of 0～10 ℃;
2) optimize air knife parameter: air knife cutter lip is 600～1000/mm apart from liquid level distance; Air knife cutter lip is 15～30mm apart from band steel distance; According to unit speed and thickness of coating, air pressure is adjusted within the scope of 100～300mbar.
2. a kind of method of controlling thick material thickness coating pot galvanize product zinc flow liner according to claim 1, is characterized in that, the temperature in described fan house is by installing an air-conditioner in air sword blower fan chamber or taking the mode that cold blast engine is blown a cold wind over to realize.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410163759.1A CN103966537B (en) | 2014-04-21 | 2014-04-21 | Method for controlling zinc flow marks of thick-material thick-coating hot-dip galvanized product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410163759.1A CN103966537B (en) | 2014-04-21 | 2014-04-21 | Method for controlling zinc flow marks of thick-material thick-coating hot-dip galvanized product |
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| Publication Number | Publication Date |
|---|---|
| CN103966537A true CN103966537A (en) | 2014-08-06 |
| CN103966537B CN103966537B (en) | 2018-02-27 |
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| CN201410163759.1A Active CN103966537B (en) | 2014-04-21 | 2014-04-21 | Method for controlling zinc flow marks of thick-material thick-coating hot-dip galvanized product |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105063534A (en) * | 2015-09-11 | 2015-11-18 | 首钢总公司 | Method for controlling fleck defect on surface of band steel |
| CN107557711A (en) * | 2017-09-15 | 2018-01-09 | 首钢京唐钢铁联合有限责任公司 | Method for preventing zinc flow lines from appearing on surface of galvanized strip steel |
| CN107574395A (en) * | 2017-09-04 | 2018-01-12 | 北京首钢冷轧薄板有限公司 | A kind of method and device for eliminating zinc flow liner |
| CN108588614A (en) * | 2018-04-23 | 2018-09-28 | 黄石山力科技股份有限公司 | A kind of super thick coating production method |
| CN108642421A (en) * | 2018-05-15 | 2018-10-12 | 首钢集团有限公司 | A kind of production method of galvanized steel plain sheet |
| CN109097715A (en) * | 2018-08-20 | 2018-12-28 | 首钢京唐钢铁联合有限责任公司 | Method and device for controlling strip steel pot-entering temperature of continuous hot galvanizing production line |
| CN110004369A (en) * | 2019-04-30 | 2019-07-12 | 马鞍山钢铁股份有限公司 | A kind of elevator think gauge galvanized steel plain sheet and its manufacturing method |
| CN111155046A (en) * | 2020-02-17 | 2020-05-15 | 本钢板材股份有限公司 | Air knife control device and method for hot galvanizing unit |
| CN111534774A (en) * | 2020-04-29 | 2020-08-14 | 鞍钢股份有限公司 | Method for reducing hot galvanizing zinc flow ripple defects |
| CN113430478A (en) * | 2021-05-31 | 2021-09-24 | 武汉钢铁有限公司 | Method for eliminating zinc corrugation defect of alloyed hot-dip galvanized steel sheet |
| CN113481455A (en) * | 2021-07-08 | 2021-10-08 | 攀钢集团攀枝花钢钒有限公司 | Method for producing high-surface-quality zinc-aluminum-magnesium coated steel strip/plate by using air knife |
| CN113755773A (en) * | 2021-08-12 | 2021-12-07 | 唐山钢铁集团高强汽车板有限公司 | Control method for surface quality of thick zinc-aluminum-magnesium strip steel with thick coating |
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| JP2009500520A (en) * | 2005-06-30 | 2009-01-08 | アーベーベー・アーベー | Device and method for controlling thickness |
| CN103397290A (en) * | 2013-08-01 | 2013-11-20 | 首钢总公司 | Method for eliminating black transverse striation defects on surface of zinc-plated sheet |
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2014
- 2014-04-21 CN CN201410163759.1A patent/CN103966537B/en active Active
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| JP2009500520A (en) * | 2005-06-30 | 2009-01-08 | アーベーベー・アーベー | Device and method for controlling thickness |
| CN103397290A (en) * | 2013-08-01 | 2013-11-20 | 首钢总公司 | Method for eliminating black transverse striation defects on surface of zinc-plated sheet |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105063534A (en) * | 2015-09-11 | 2015-11-18 | 首钢总公司 | Method for controlling fleck defect on surface of band steel |
| CN105063534B (en) * | 2015-09-11 | 2018-04-27 | 首钢集团有限公司 | A kind of belt steel surface fleck defect control method |
| CN107574395A (en) * | 2017-09-04 | 2018-01-12 | 北京首钢冷轧薄板有限公司 | A kind of method and device for eliminating zinc flow liner |
| CN107557711A (en) * | 2017-09-15 | 2018-01-09 | 首钢京唐钢铁联合有限责任公司 | Method for preventing zinc flow lines from appearing on surface of galvanized strip steel |
| CN108588614A (en) * | 2018-04-23 | 2018-09-28 | 黄石山力科技股份有限公司 | A kind of super thick coating production method |
| CN108642421A (en) * | 2018-05-15 | 2018-10-12 | 首钢集团有限公司 | A kind of production method of galvanized steel plain sheet |
| CN109097715A (en) * | 2018-08-20 | 2018-12-28 | 首钢京唐钢铁联合有限责任公司 | Method and device for controlling strip steel pot-entering temperature of continuous hot galvanizing production line |
| CN110004369A (en) * | 2019-04-30 | 2019-07-12 | 马鞍山钢铁股份有限公司 | A kind of elevator think gauge galvanized steel plain sheet and its manufacturing method |
| CN111155046A (en) * | 2020-02-17 | 2020-05-15 | 本钢板材股份有限公司 | Air knife control device and method for hot galvanizing unit |
| CN111155046B (en) * | 2020-02-17 | 2022-04-15 | 本钢板材股份有限公司 | Air knife control device and method for hot galvanizing unit |
| CN111534774A (en) * | 2020-04-29 | 2020-08-14 | 鞍钢股份有限公司 | Method for reducing hot galvanizing zinc flow ripple defects |
| CN113430478A (en) * | 2021-05-31 | 2021-09-24 | 武汉钢铁有限公司 | Method for eliminating zinc corrugation defect of alloyed hot-dip galvanized steel sheet |
| CN113481455A (en) * | 2021-07-08 | 2021-10-08 | 攀钢集团攀枝花钢钒有限公司 | Method for producing high-surface-quality zinc-aluminum-magnesium coated steel strip/plate by using air knife |
| CN113755773A (en) * | 2021-08-12 | 2021-12-07 | 唐山钢铁集团高强汽车板有限公司 | Control method for surface quality of thick zinc-aluminum-magnesium strip steel with thick coating |
| CN113755773B (en) * | 2021-08-12 | 2023-08-25 | 唐山钢铁集团高强汽车板有限公司 | Control method for surface quality of thick-specification thick-coating zinc-aluminum-magnesium strip steel |
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| CN103966537B (en) | 2018-02-27 |
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