CN107574395A - A kind of method and device for eliminating zinc flow liner - Google Patents
A kind of method and device for eliminating zinc flow liner Download PDFInfo
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- CN107574395A CN107574395A CN201710786637.1A CN201710786637A CN107574395A CN 107574395 A CN107574395 A CN 107574395A CN 201710786637 A CN201710786637 A CN 201710786637A CN 107574395 A CN107574395 A CN 107574395A
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- zinc
- air knife
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- zinc liquid
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Abstract
The invention provides a kind of method and device for eliminating zinc flow liner, methods described is applied in hot-dip galvanized steel strip product, including：It is 461~465 DEG C to control zinc liquid temperature in zinc-plated producing line；Aluminium Al mass percent is 0.2~0.22% in the zinc liquid；Control the distance between air knife and the belt steel surface≤16mm；The gas pressure for controlling the air knife is 0.12~0.16MPa；Wherein, the chill steel plate flatness IU of the belt steel product<6；So, it it is 461~465 DEG C by the zinc liquid temperature control in zinc pot, it is 0.2~0.22% by the mass percent of aluminium Al in zinc liquid, and air knife distance and air knife flow are controlled according to the method described above, the zinc flow liner of belt steel surface can effectively be eliminated, the quality and grade of hot-dip galvanized steel strip product are improved, and then improves economic well-being of workers and staff.
Description
Technical field
The invention belongs to metallurgical technology field, more particularly to a kind of method and device for eliminating zinc flow liner.
Background technology
In recent years, hot dip zinc product zinc flow liner defect has a strong impact on the application of user as a kind of typical surface defect
With further deep processing, it is difficult to meet the requirement of high-end outside plate.
The generation of zinc flow liner, influences strip surface quality, reduces product hierarchy, so cause the economic benefit of company by
Greater loss, while had a strong impact on that normal rhythm of production, operating efficiency also further reduce.
The content of the invention
The problem of existing for prior art, the embodiments of the invention provide it is a kind of eliminate zinc flow liner method and device,
For solving in the prior art when producing hot dip zinc product, zinc flow liner, which easily occurs, in belt steel surface to be caused under strip surface quality
The technical problem of drop.
The present invention provides a kind of method for eliminating zinc flow liner, and methods described is applied in hot-dip galvanized steel strip product, including：
It is 461~465 DEG C to control zinc liquid temperature in zinc-plated producing line；In the zinc liquid aluminium Al mass percent be 0.2~
0.22%；
Control the distance between air knife and the belt steel surface≤16mm；Control the gas pressure of the air knife for 0.12~
0.16MPa；Wherein, the chill steel plate flatness IU of the belt steel product<6.
In such scheme, the angle of the air knife is -6~1 °.
In such scheme, the speed of service of the belt steel product is 97~103m/min.
In such scheme, Pb mass percent≤0.025% in the zinc liquid；Remaining is zinc Zn.
5th, the method as described in claim 1, it is characterised in that between the air knife and the strip of the strip both sides
It is 12~15mm apart from sum.
The present invention also provides a kind of device for eliminating zinc flow liner, and described device includes：
First control unit, it is 461~465 DEG C for controlling zinc liquid temperature in zinc-plated producing line；Aluminium Al in the zinc liquid
Mass percent is 0.2~0.22%；
Second control unit, for controlling the distance between air knife and the belt steel surface≤16mm；Control the air knife
Gas pressure be 0.12~0.16MPa；Wherein, the chill steel plate flatness IU of the belt steel product<6.
In such scheme, the angle of the air knife is -6~1 °.
In such scheme, the speed of service of the belt steel product is 97~103m/min.
In such scheme, Pb mass percent≤0.025% in the zinc liquid；Remaining is zinc Zn.
In such scheme, the distance between air knife and the strip of the strip both sides sum are 12~15mm.
The invention provides a kind of method and device for eliminating zinc flow liner, methods described is applied in hot-dip galvanized steel strip product
In, including：It is 461~465 DEG C to control zinc liquid temperature in zinc-plated producing line；In the zinc liquid aluminium Al mass percent be 0.2~
0.22%；Control the distance between air knife and the belt steel surface≤16mm；Control the gas pressure of the air knife for 0.12~
0.16MPa；Wherein, the chill steel plate flatness IU of the belt steel product<6；In this way, it is by the zinc liquid temperature control in zinc pot
461~465 DEG C, by the mass percent of aluminium Al in zinc liquid be 0.2~0.22%, and according to the method described above control air knife distance and
Air knife flow, the zinc flow liner of belt steel surface can be effectively eliminated, improve the quality and grade of hot-dip galvanized steel strip product, and then improve
Economic well-being of workers and staff.
Brief description of the drawings
Fig. 1 is the method flow schematic diagram for the elimination zinc flow liner that the embodiment of the present invention one provides；
Fig. 2 is the apparatus structure schematic diagram for the elimination zinc flow liner that the embodiment of the present invention two provides.
Embodiment
The invention provides a kind of method and device for eliminating zinc flow liner, methods described is applied in hot-dip galvanized steel strip product
In, including：It is 461~465 DEG C to control zinc liquid temperature in zinc-plated producing line；In the zinc liquid aluminium Al mass percent be 0.2~
0.22%；Control the distance between air knife and the belt steel surface≤16mm；Control the gas pressure of the air knife for 0.12~
0.16MPa；Wherein, the chill steel plate flatness IU of the belt steel product<6.
Technical scheme is described in further detail below by drawings and the specific embodiments.
Embodiment one
The present embodiment provides a kind of method for eliminating zinc flow liner, and methods described is applied in hot-dip galvanized steel strip product, such as Fig. 1
Shown, methods described includes：
S101, it is 461~465 DEG C to control zinc liquid temperature in zinc-plated producing line；Aluminium Al mass percent is in the zinc liquid
0.2~0.22%；
In this step, in galvanizing producing line, zinc liquid temperature is higher in zinc pot, strip to go out pot temperature higher, in strip
Heat it is also bigger, be less susceptible to produce zinc flow liner defect；But if zinc liquid temperature is too high, easily cause the formation of cadmia,
Cadmia defect is produced, influences product surface quality.
Therefore it is 461~465 DEG C that the present embodiment, which controls the zinc liquid temperature in zinc-plated producing line,；Here, the zinc liquid includes
Al, zinc Zn and lead Pb.Al and Pb has certain influence to the mobility of zinc liquid in zinc liquid composition, in general, is added in zinc liquid
Main influence of the aluminium on galvanizing be to improve the adhesiveness of zinc coat, increase zinc fluid viscosity and surface tension, reduce zinc liquid pair
The wetting capacity of steel plate, extend the zinc-plated time, and scum silica frost is formed with the iron in zinc liquid.Aluminium Al in zinc liquid described in the present embodiment
Mass percent is 0.2~0.22%.
For lead Pb, Pb mass percent is big when increasing, and zinc liquid mobility improves.Otherwise zinc flower reduces, mobility
Reduce.Therefore Pb≤0.025% in the present embodiment；Remaining is zinc Zn.
It should be noted that strip, before galvanizing, the surface defect that raw sheet carries is after galvanizing, its original table
Planar defect can not only cover, and be more obvious on the contrary.So if raw sheet carries travers defect, then plate face after zinc has been plated
Travers equally occur, and became apparent from more originally；If there are serious center wave or side wave in raw sheet surface, then on side
Portion produces local regular zinc coating thickness inequality in centre, and zinc flow liner defect is produced at the thicker position of coating.
Therefore the chill steel plate flatness IU of the belt steel product from a rolling flow in zinc-plated producing line out<6, and belt steel surface
Without travers.
S102, control the distance between air knife and the belt steel surface≤16mm；The gas pressure for controlling the air knife is
0.12~0.16MPa；
In this step, the principal element because influenceing zinc flow liner is the flow of the distance and air knife between air knife nozzle and strip.
For example in the case that strip speed is low, to control thickness of coating, under equal pressure, then need to increase air knife distance.Distance is big,
Pressure is high, then easily causes strip distance and thickness of coating fluctuation.Under high pressure, zinc liquid can be also accelerated to cool down, and then zinc liquid stream
Dynamic property reduces.
Therefore, the distance between air knife and the belt steel surface≤16mm are controlled in the present embodiment；Control the strip two
The distance between the air knife of side and the strip sum are 12~15mm.The body pressure for controlling air knife is 0.12~0.16MPa；Control
The angle for making the air knife is：- 6~1 °；And it is 97~103m/min to control strip speed.
Embodiment two
Corresponding to embodiment one, the present embodiment provides a kind of device for eliminating zinc flow liner, as shown in Fig. 2 described device bag
Include：First control unit 21 and the second control unit 22；Wherein,
In galvanizing producing line, zinc liquid temperature is higher in zinc pot, and strip goes out that pot temperature is higher, and the heat in strip is also
It is bigger, it is less susceptible to produce zinc flow liner defect；But if zinc liquid temperature is too high, easily cause the formation of cadmia, produce cadmia and lack
Fall into, influence product surface quality.
Therefore the first control unit of the present embodiment 21 is used to control the zinc liquid temperature in zinc-plated producing line to be 461~465 DEG C；This
In, the zinc liquid includes Al, zinc Zn and lead Pb.Al and Pb has certain influence on the mobility of zinc liquid in zinc liquid composition, and one
As for, the main influence of the aluminium that is added in zinc liquid on galvanizing is to improve the adhesiveness of zinc coat, increases zinc fluid viscosity and table
Face tension force, zinc liquid is reduced to the wetting capacity of steel plate, extends the zinc-plated time, and form scum silica frost with the iron in zinc liquid.The present embodiment
Described in zinc liquid aluminium Al mass percent be 0.2~0.22%.
For lead Pb, Pb mass percent is big when increasing, and zinc liquid mobility improves.Otherwise zinc flower reduces, mobility
Reduce.Therefore Pb≤0.025% in the present embodiment；Remaining is zinc Zn.
It should be noted that strip, before galvanizing, the surface defect that raw sheet carries is after galvanizing, its original table
Planar defect can not only cover, and be more obvious on the contrary.So if raw sheet carries travers defect, then plate face after zinc has been plated
Travers equally occur, and became apparent from more originally；If there are serious center wave or side wave in raw sheet surface, then on side
Portion produces local regular zinc coating thickness inequality in centre, and zinc flow liner defect is produced at the thicker position of coating.
Therefore the chill steel plate flatness IU of the belt steel product from a rolling flow in zinc-plated producing line out<6, and belt steel surface
Without travers.
Further, because the principal element for influenceing zinc flow liner is the flow of distance between air knife nozzle and strip and air knife.
For example in the case that strip speed is low, to control thickness of coating, under equal pressure, then need to increase air knife distance.Distance is big,
Pressure is high, then easily causes strip distance and thickness of coating fluctuation.Under high pressure, zinc liquid can be also accelerated to cool down, and then zinc liquid stream
Dynamic property reduces.
Therefore, the second control unit 21 controls the distance between air knife and the belt steel surface≤16mm in the present embodiment；
It is 12~15mm to control the distance between the air knife of the strip both sides and strip sum.The body pressure for controlling air knife is
0.12~0.16MPa；The angle for controlling the air knife is：- 6~1 °；And it is 97~103m/min to control strip speed.
In practical application, first control unit 21 and second control unit 22 can be by Programmable logical controllers
Device (PLC, Programmable Logic Controller) is realized.
Embodiment three
In practical application, the device of method and embodiment two offer provided using embodiment one is to wide cut outside plate galvanizing
When, idiographic flow is as follows：
In galvanizing producing line, zinc liquid temperature is higher in zinc pot, and strip goes out that pot temperature is higher, and the heat in strip is also
It is bigger, it is less susceptible to produce zinc flow liner defect；But if zinc liquid temperature is too high, easily cause the formation of cadmia, produce cadmia and lack
Fall into, influence product surface quality.
Therefore it is 463 DEG C that the present embodiment, which controls the zinc liquid temperature in zinc-plated producing line,；Here, the zinc liquid includes Al, zinc
Zn and lead Pb.Al and Pb has certain influence to the mobility of zinc liquid in zinc liquid composition, in general, the aluminium pair added in zinc liquid
The main influence of galvanizing is to improve the adhesiveness of zinc coat, increases zinc fluid viscosity and surface tension, reduces zinc liquid to steel plate
Wetting capacity, extend the zinc-plated time, and scum silica frost is formed with the iron in zinc liquid.Aluminium Al quality hundred in zinc liquid described in the present embodiment
Divide than being 0.21%.
For lead Pb, Pb mass percent is big when increasing, and zinc liquid mobility improves.Otherwise zinc flower reduces, mobility
Reduce.Therefore Pb mass percent is 0.023% in the present embodiment；Remaining is zinc Zn.
It should be noted that strip, before galvanizing, the surface defect that raw sheet carries is after galvanizing, its original table
Planar defect can not only cover, and be more obvious on the contrary.So if raw sheet carries travers defect, then plate face after zinc has been plated
Travers equally occur, and became apparent from more originally；If there are serious center wave or side wave in raw sheet surface, then on side
Portion produces local regular zinc coating thickness inequality in centre, and zinc flow liner defect is produced at the thicker position of coating.
Therefore the chill steel plate flatness IU of the belt steel product from a rolling flow in zinc-plated producing line out is 5, and strip table
Face is without travers.
Further, because the principal element for influenceing zinc flow liner is the flow of distance between air knife nozzle and strip and air knife.
For example in the case that strip speed is low, to control thickness of coating, under equal pressure, then need to increase air knife distance.Distance is big,
Pressure is high, then easily causes strip distance and thickness of coating fluctuation.Under high pressure, zinc liquid can be also accelerated to cool down, and then zinc liquid stream
Dynamic property reduces.
Therefore, it is 14mm that the distance between air knife and the belt steel surface are controlled in the present embodiment；Control the strip two
The distance between the air knife of side and the strip sum are 13mm.The body pressure for controlling air knife is 0.15MPa；Control the air knife
Angle be 3 °；And it is 100m/min to control strip speed.
Wide cut outside plate after galvanizing is without zinc flow liner.
Example IV
In practical application, the device of method and embodiment two offer provided using embodiment one is to another wide cut outside plate warm
When zinc-plated, idiographic flow is as follows：
In galvanizing producing line, zinc liquid temperature is higher in zinc pot, and strip goes out that pot temperature is higher, and the heat in strip is also
It is bigger, it is less susceptible to produce zinc flow liner defect；But if zinc liquid temperature is too high, easily cause the formation of cadmia, produce cadmia and lack
Fall into, influence product surface quality.
Therefore it is 462 DEG C that the present embodiment, which controls the zinc liquid temperature in zinc-plated producing line,；Here, the zinc liquid includes Al, zinc
Zn and lead Pb.Al and Pb has certain influence to the mobility of zinc liquid in zinc liquid composition, in general, the aluminium pair added in zinc liquid
The main influence of galvanizing is to improve the adhesiveness of zinc coat, increases zinc fluid viscosity and surface tension, reduces zinc liquid to steel plate
Wetting capacity, extend the zinc-plated time, and scum silica frost is formed with the iron in zinc liquid.Aluminium Al quality hundred in zinc liquid described in the present embodiment
Divide than being 0.21%.
For lead Pb, Pb mass percent is big when increasing, and zinc liquid mobility improves.Otherwise zinc flower reduces, mobility
Reduce.Therefore Pb mass percent is 0.021% in the present embodiment；Remaining is zinc Zn.
It should be noted that strip, before galvanizing, the surface defect that raw sheet carries is after galvanizing, its original table
Planar defect can not only cover, and be more obvious on the contrary.So if raw sheet carries travers defect, then plate face after zinc has been plated
Travers equally occur, and became apparent from more originally；If there are serious center wave or side wave in raw sheet surface, then on side
Portion produces local regular zinc coating thickness inequality in centre, and zinc flow liner defect is produced at the thicker position of coating.
Therefore the chill steel plate flatness IU of the belt steel product from a rolling flow in zinc-plated producing line out is 4, and strip table
Face is without travers.
Further, because the principal element for influenceing zinc flow liner is the flow of distance between air knife nozzle and strip and air knife.
For example in the case that strip speed is low, to control thickness of coating, under equal pressure, then need to increase air knife distance.Distance is big,
Pressure is high, then easily causes strip distance and thickness of coating fluctuation.Under high pressure, zinc liquid can be also accelerated to cool down, and then zinc liquid stream
Dynamic property reduces.
Therefore, it is 13mm that the distance between air knife and the belt steel surface are controlled in the present embodiment；Control the strip two
The distance between the air knife of side and the strip sum are 14mm.The body pressure for controlling air knife is 0.14MPa；Control the air knife
Angle be 3 °；And it is 98m/min to control strip speed.
Wide cut outside plate after galvanizing is without zinc flow liner.
The beneficial effect that the method and device provided in an embodiment of the present invention for eliminating zinc flow liner can be brought is at least：
The method and device provided in an embodiment of the present invention for eliminating zinc flow liner, methods described are applied in hot-dip galvanized steel strip product
In, including：It is 461~465 DEG C to control zinc liquid temperature in zinc-plated producing line；In the zinc liquid aluminium Al mass percent be 0.2~
0.22%；Control the distance between air knife and the belt steel surface≤16mm；Control the gas pressure of the air knife for 0.12~
0.16MPa；Wherein, the chill steel plate flatness IU of the belt steel product<6；In this way, it is by the zinc liquid temperature control in zinc pot
461~465 DEG C, by the mass percent of aluminium Al in zinc liquid be 0.2~0.22%, and according to the method described above control air knife distance and
Air knife flow, the zinc flow liner of belt steel surface can be effectively eliminated, improve the quality and grade of hot-dip galvanized steel strip product, and then improve
Economic well-being of workers and staff.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention, it is all
All any modification, equivalent and improvement made within the spirit and principles in the present invention etc., it should be included in the protection of the present invention
Within the scope of.
Claims (10)
- A kind of 1. method for eliminating zinc flow liner, it is characterised in that methods described is applied in hot-dip galvanized steel strip product, including：It is 461~465 DEG C to control zinc liquid temperature in zinc-plated producing line；In the zinc liquid aluminium Al mass percent be 0.2~ 0.22%；Control the distance between air knife and the belt steel surface≤16mm；Control the gas pressure of the air knife for 0.12~ 0.16MPa；Wherein, the chill steel plate flatness IU of the belt steel product<6.
- 2. the method as described in claim 1, it is characterised in that the angle of the air knife is -6~1 °.
- 3. the method as described in claim 1, it is characterised in that the speed of service of the belt steel product is 97~103m/min.
- 4. the method as described in claim 1, it is characterised in that Pb mass percent≤0.025% in the zinc liquid；Remaining For zinc Zn.
- 5. the method as described in claim 1, it is characterised in that the distance between air knife and the strip of the strip both sides Sum is 12~15mm.
- 6. a kind of device for eliminating zinc flow liner, it is characterised in that described device includes：First control unit, it is 461~465 DEG C for controlling zinc liquid temperature in zinc-plated producing line；Aluminium Al quality in the zinc liquid Percentage is 0.2~0.22%；Second control unit, for controlling the distance between air knife and the belt steel surface≤16mm；Control the gas of the air knife Body pressure is 0.12~0.16MPa；Wherein, the chill steel plate flatness IU of the belt steel product<6.
- 7. device as claimed in claim 6, it is characterised in that the angle of the air knife is -6~1 °.
- 8. device as claimed in claim 6, it is characterised in that the speed of service of the belt steel product is 97~103m/min.
- 9. device as claimed in claim 6, it is characterised in that Pb mass percent≤0.025% in the zinc liquid；Remaining For zinc Zn.
- 10. device as claimed in claim 6, it is characterised in that between the air knife and the strip of the strip both sides away from It is 12~15mm from sum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710786637.1A CN107574395B (en) | 2017-09-04 | 2017-09-04 | Method and device for eliminating zinc flow lines |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710786637.1A CN107574395B (en) | 2017-09-04 | 2017-09-04 | Method and device for eliminating zinc flow lines |
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| CN107574395A true CN107574395A (en) | 2018-01-12 |
| CN107574395B CN107574395B (en) | 2020-02-21 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115233129A (en) * | 2022-07-18 | 2022-10-25 | 首钢京唐钢铁联合有限责任公司 | Control method and device for hot galvanizing of strip steel and strip steel |
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| 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 |
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| CN115233129A (en) * | 2022-07-18 | 2022-10-25 | 首钢京唐钢铁联合有限责任公司 | Control method and device for hot galvanizing of strip steel and strip steel |
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| CN107574395B (en) | 2020-02-21 |
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