CN105063534A - Method for controlling fleck defect on surface of band steel - Google Patents
Method for controlling fleck defect on surface of band steel Download PDFInfo
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- CN105063534A CN105063534A CN201510579997.5A CN201510579997A CN105063534A CN 105063534 A CN105063534 A CN 105063534A CN 201510579997 A CN201510579997 A CN 201510579997A CN 105063534 A CN105063534 A CN 105063534A
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Abstract
The invention discloses a method for controlling a fleck defect on the surface of band steel, which is applied to a technological process that the band steel enters a zinc pot to be subjected to hot galvanizing and solves the technical problem that the fleck defect can be easily formed when an existing hot galvanized production technology is utilized for producing thick-gauge hot galvanizing products. The method comprises the following steps of speeding up the running speed of the band steel to a first speed value before the band steel which is used for producing a galvanized plate with the zinc layer thickness being greater than or equal to Z180 enters a zinc pot; judging whether the current running speed of the band steel is less than a first speed threshold value or not; reducing the distance of an air knife to be within a preset distance zone according to to-be-galvanized thickness on the surface of the band steel if a judging result shows that the current running speed is less than the first speed threshold value, and reducing the jetting pressure of the air knife to a preset pressure value according to galvanized thickness; carrying out hot galvanizing on the band steel through the zinc pot. According to the method disclosed by the invention, the quality of the hot galvanized products is increased.
Description
Technical field
The present invention relates to hot dip galvanizing process technical field, particularly relate to a kind of belt steel surface fleck defect control method.
Background technology
In recent years, along with improving constantly of hot dip galvanizing substrate surface quality, hot dip galvanizing steel plate coating surface quality have also been obtained very large improvement.But, in the production process of pot galvanize product, the surface quality of zinc layers still exposes many problems, and fleck defect is as the typical thickness coating galvanized plate surface defect of one, have a strong impact on hot-dip galvanized steel strip surface quality, make galvanized sheet be difficult to meet high-end galvanized sheet product as the requirement of appliance plate.
In hot dip galvanizing process process, enter zinc pot after the annealed stove of band steel, the zinc liquid being covered in its surface is taken out of when going out zinc pot by band steel.In order to ensure the coating obtaining suitable thickness, adopting air knife to purge belt steel surface zinc liquid, allowing unnecessary zinc liquid be back in zinc pot.But the general air knife jet length of thickness coating galvanized sheet is comparatively large, and air pressure is less, therefore existing hot dip galvanizing process is produced think gauge pot galvanize product and is easily formed fleck defect, makes a big impact to strip surface quality.
Summary of the invention
The object of the present invention is to provide a kind of belt steel surface fleck defect control method, produce to solve existing hot dip galvanizing process the technical problem that think gauge pot galvanize product easily forms fleck defect.
A kind of belt steel surface fleck defect control method that the embodiment of the present invention provides, be applied to band steel to enter zinc pot and carry out in the technical process of pot galvanize, described method comprises the steps: before the band steel for the production of zinc coating thickness >=Z180 galvanized sheet enters described zinc pot, by the speed-raising of the travelling speed of described band steel to First Speed value; Judge whether the current travelling speed of described band steel is less than First Speed threshold value; If when judged result shows that described current travelling speed is less than described First Speed threshold value, interval to predeterminable range according to the thickness zinc-plated at described belt steel surface is reduced air knife distance, and reduce air knife jetting pressure to preset pressure value according to described zinc-plated thickness; Described band steel carries out pot galvanize through described zinc pot.
Preferably, described First Speed threshold value is 85 ~ 90m/min.
Preferably, described predeterminable range interval is less than 15mm.
Preferably, described preset pressure value is less than 150mbar.
One or more technical schemes that the embodiment of the present invention provides, at least have following technique effect and advantage:
The embodiment of the present invention produces thickness coating band steel by the travelling speed improving band steel, thus the air knife processing parameter easily producing bright spot can be avoided interval, solve existing hot dip galvanizing process and produce the technical problem that think gauge pot galvanize product easily forms fleck defect, improve the quality of pot galvanize product.The situation of setting speed threshold value can not be greater than for the travelling speed improving band steel, also adopt ancillary technique means: interval to predeterminable range according to the thickness zinc-plated at belt steel surface is reduced air knife distance, and reduce air knife jetting pressure to preset pressure value according to by the thickness zinc-plated at belt steel surface, thus ensure that the band steel that cannot raise speed to First Speed threshold value also can obtain suitable thickness of coating.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the schema of belt steel surface fleck defect control method in the embodiment of the present invention.
Embodiment
Produce to solve existing hot dip galvanizing process the technical problem that think gauge pot galvanize product easily forms fleck defect, embodiments provide a kind of belt steel surface fleck defect control method, general thought is as follows:
Before the band steel for the production of zinc coating thickness >=Z180 galvanized sheet enters described zinc pot, by the travelling speed speed-raising of band steel to First Speed value; The situation being less than First Speed threshold value in speed-raising to First Speed value also takes to adjust the supplementary means of air knife processing parameter.
Technique scheme, thickness coating band steel is produced by the travelling speed improving band steel, thus the air knife processing parameter easily producing bright spot can be avoided interval, solve existing hot dip galvanizing process and produce the technical problem that think gauge pot galvanize product easily forms fleck defect, improve the quality of pot galvanize product.The situation of setting speed threshold value can not be greater than for the travelling speed improving band steel, also adopt ancillary technique means: interval to predeterminable range according to the thickness zinc-plated at belt steel surface is reduced air knife distance, and reduce air knife jetting pressure to preset pressure value according to by the thickness zinc-plated at belt steel surface, thus ensure that the band steel that cannot raise speed to First Speed threshold value also can obtain suitable thickness of coating.
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiments provide a kind of belt steel surface fleck defect control method, be applied to band steel and enter zinc pot and carry out in the technical process of pot galvanize, shown in figure 1, this belt steel surface fleck defect control method comprises the steps:
S101, before the band steel for the production of zinc coating thickness >=Z180 galvanized sheet enters zinc pot, will band steel travelling speed speed-raising to First Speed value.In specific implementation process, the thickness influence of specification First Speed value of galvanized sheet, specifically, First Speed value by with production galvanized sheet thickness specification corresponding to can reach the top speed in zinc pot., the thickness of galvanized sheet product is larger, and raising speed the First Speed value arrived will be less.Such as, the maximum operational speed that the galvanized sheet of thickness specification Z180 can reach in zinc pot is 90m/min, then, when producing the galvanized sheet of thickness specification Z180, raise speed the travelling speed of band steel to 90m/min before band steel enters zinc pot.Again such as, the maximum operational speed that the galvanized sheet of thickness specification Z470 can reach in zinc pot is 84m/min, then, when producing the galvanized sheet of thickness specification Z470, raise speed the travelling speed of band steel to 84m/min before band steel enters zinc pot.
S102, judge to be with the current travelling speed of steel whether to be less than First Speed threshold value.Concrete, First Speed threshold value is 85 ~ 90m/min, preferably, First Speed threshold value is selected to be 90m/min, so that strip speed is controlled at more than 90m/min, at execution S101 band steel raised speed and detect current travelling speed after First Speed value, the current travelling speed detected and First Speed threshold value are compared, judges whether current travelling speed is less than First Speed threshold value.Because the thickness of galvanized sheet is larger, First Speed value is less, therefore, if the thickness of the galvanized sheet produced reaches certain, can not obtain with steel speed-raising the First Speed value being more than or equal to First Speed threshold value, and therefore for this situation, need to perform following S103.If the speed-raising of band steel can obtain the First Speed value being more than or equal to First Speed threshold value, then there is no need to perform S103.
If when S103 judged result shows that current travelling speed is less than First Speed threshold value, interval to predeterminable range according to the thickness zinc-plated at belt steel surface is reduced air knife distance, and reduce air knife jetting pressure to preset pressure value according to zinc-plated thickness.
In specific implementation process, predeterminable range interval need be less than 15mm, and preset pressure value need be less than 150mbar.
S104, band steel carry out pot galvanize through zinc pot.
For technical scheme provided by the present invention is clearly described, if First Speed threshold value is 90m/min, the invention provides for producing the galvanized sheet that zinc coating thickness is Z180, Z275 two kinds of thickness specifications, the substrate thickness of galvanized sheet is the concrete production instance of 2.0mm.
Steel will be with to raise speed to First Speed value, detect that the current travelling speed of band steel equals 90m/min, meet and equal 90m/min, then shown in the processing parameter such as air knife distance, air knife jetting pressure reference following table 1, and contrast with the parameter of traditional hot dip galvanizing process.
The processing parameter contrast of table 1.Z180 galvanized sheet
As can be seen from the contrast of table 1, adopt the belt steel surface fleck defect control method in the embodiment of the present invention effectively can remove Z180 galvanized sheet surface black band defect.
To raise speed to First Speed value before the band steel producing zinc coating thickness Z275 enters zinc pot, detect that current travelling speed equals 90m/min, meet and equal 90m/min, then the processing parameter such as air knife distance, air knife jetting pressure is with reference to shown in following table 2, and traditional is contrasted for production Z275 hot dip galvanizing process parameter.
The processing parameter contrast of table 2.Z275 galvanized sheet
As can be seen from the contrast of table 2, adopt the belt steel surface fleck defect control method in the embodiment of the present invention effectively can remove Z275 galvanized sheet surface black band defect.
For the speed-raising of Z470 galvanized sheet to First Speed value, detect that the current travelling speed of Z470 galvanized sheet equals 84m/min, it is interval to predeterminable range that 84m/min<90m/min then reduces air knife distance according to the zinc coating thickness of described belt steel surface, and reduce air knife jetting pressure to preset pressure value according to zinc coating thickness, concrete, traditional parameter for Z470 hot dip galvanizing process with reference to shown in following table 2, and contrasts by the processing parameters such as air knife distance, air knife jetting pressure.
The parameter comparison of table 3.Z470 galvanized sheet
As can be seen from the contrast of table 3, adopt the belt steel surface fleck defect control method in the embodiment of the present invention effectively can remove Z470 galvanized sheet surface black band defect.
The embodiment of the present invention produces thickness coating band steel by the travelling speed improving band steel, thus the air knife processing parameter easily producing bright spot can be avoided interval, solve existing hot dip galvanizing process and produce the technical problem that think gauge pot galvanize product easily forms fleck defect, improve the quality of pot galvanize product.The situation of setting speed threshold value can not be greater than for the travelling speed improving band steel, also adopt ancillary technique means: interval to predeterminable range according to the thickness zinc-plated at belt steel surface is reduced air knife distance, and reduce air knife jetting pressure to preset pressure value according to by the thickness zinc-plated at belt steel surface, thus ensure that the band steel that cannot raise speed to First Speed threshold value also can obtain suitable thickness of coating.
Although describe the preferred embodiments of the present invention, those skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (4)
1. a belt steel surface fleck defect control method, be applied to band steel and enter zinc pot and carry out, in the technical process of pot galvanize, it is characterized in that, described method comprises the steps:
Before the band steel for the production of zinc coating thickness >=Z180 galvanized sheet enters described zinc pot, by the speed-raising of the travelling speed of described band steel to First Speed value;
Judge whether the current travelling speed of described band steel is less than First Speed threshold value;
If when judged result shows that described current travelling speed is less than described First Speed threshold value, interval to predeterminable range according to the thickness zinc-plated at described belt steel surface is reduced air knife distance, and reduce air knife jetting pressure to preset pressure value according to described zinc-plated thickness;
Described band steel carries out pot galvanize through described zinc pot.
2. belt steel surface fleck defect control method as claimed in claim 1, it is characterized in that, described First Speed threshold value is 85 ~ 90m/min.
3. belt steel surface fleck defect control method as claimed in claim 2, it is characterized in that, described predeterminable range interval is less than 15mm.
4. belt steel surface fleck defect control method as claimed in claim 3, it is characterized in that, described preset pressure value is less than 150mbar.
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Cited By (3)
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| CN107179749A (en) * | 2016-03-11 | 2017-09-19 | 宝山钢铁股份有限公司 | Hot dip zinc product whole process method of quality control |
| 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 |
| 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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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107179749A (en) * | 2016-03-11 | 2017-09-19 | 宝山钢铁股份有限公司 | Hot dip zinc product whole process method of quality control |
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| 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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