CN103157680B - A kind of removing method of belt steel surface fouling ash press-in defect - Google Patents
A kind of removing method of belt steel surface fouling ash press-in defect Download PDFInfo
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- CN103157680B CN103157680B CN201310064496.4A CN201310064496A CN103157680B CN 103157680 B CN103157680 B CN 103157680B CN 201310064496 A CN201310064496 A CN 201310064496A CN 103157680 B CN103157680 B CN 103157680B
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Abstract
The invention discloses the removing method of a kind of belt steel surface fouling ash press-in defect, comprise: the total hardness value controlling cooling water between hot fine rolling frame, and clear up for the emphasis of 2 ~ 3 frames behind hot continuous rolling Chan Xian finish rolling district.Belt steel surface fouling ash provided by the invention is pressed into the removing method of defect, and method is simple, economical and efficient, utilizes the present invention under the condition not affecting the condition of production, easier can significantly reduce fouling ash and is pressed into defect incidence.
Description
Technical field
The present invention relates to technical field of steel rolling, particularly a kind of method of cancellation band steel surface scale ash press-in defect.
Background technology
SPHC Superficial Foreign Body press-in class defect is the large class defect affecting strip surface quality, shows as the indenture of auxiliary material press-in or the indenture without auxiliary material press-in.It is because certain foreign substance falls into surface of steel plate that such defect is, and is formed with operation of rolling press-in band steel.Sample detects and shows, time in indenture containing press-in thing, press-in thing has distincter boundary with band steel matrix, and composition, the structure of foreign matter are substantially different from band steel matrix.Owing to being that foreign matter drops and is pressed into the blemish caused with the operation of rolling, so this defect occurs over just band steel upper surface.The kind of foreign matter is various informative, and comprising iron filings, greasy dirt, even nut etc. foreign material all can as foreign matter source.Foreign matter press-in class blemish producing cause clearly, is not easily obscured.
A kind of fouling ash press-in defect is had in SPHC Superficial Foreign Body press-in class defect.Such defect has " hangover " pattern after press-in main body indenture and indenture, due to likeness in form " comet ", is also referred to as comet formation foreign matter press-in defect.This defect not only affects the surface quality of hot rolled thin strip, and can leave pit vestige after pickling, can cause cold rollingly rolling leakage, rolling and split the even major accident such as high speed broken belt time serious.
For this kind of defect, domestic most enterprise all adopts the mode strengthening the cleaning of whole frame to be suppressed.Along with modern steel mill rhythm of production is accelerated, frame cleaning that is consuming time, effort contradicts with high-quality, high efficiency production gradually, causes larger difficulty to product tape steel quality control on the surface.
Summary of the invention
Technical problem to be solved by this invention is to provide the removing method of a kind of belt steel surface fouling ash press-in defect, the problem of consuming time, the effort that the removing method solving current existing belt steel surface fouling ash press-in defect exists.
For solving the problems of the technologies described above, the invention provides the removing method of a kind of belt steel surface fouling ash press-in defect, comprising:
Control the total hardness value of cooling water between hot fine rolling frame.
Further, this removing method also comprises:
The pH value controlling described cooling water is alkalescent.
Further, this removing method also comprises:
Control the total conductivity of described cooling water.
Further, this removing method also comprises:
Adopt 2 ~ 3 frames behind giant equipment cleaning finish rolling district.
Further, the total hardness value of described cooling water is controlled at below 450mg/L.
Further, the pH value controlling described cooling water is 7.85-8.50.
Further, the total conductivity of described cooling water is controlled at below 1400uS/cm.
The removing method of belt steel surface fouling ash press-in defect provided by the invention, by controlling the total hardness value of cooling water between hot fine rolling frame, pH value and total conductivity, and clear up in conjunction with the emphasis of finish rolling rear portion 2 ~ 3 frame, under the condition not affecting the condition of production, easier significantly can reduce fouling ash press-in defect incidence.
Accompanying drawing explanation
Fig. 1 is that certain steel mill 1580 produces line with hardness for representing the variation of water in certain period;
The removing method of the belt steel surface fouling ash press-in defect that Fig. 2 provides for the embodiment of the present invention is applied to the fouling ash press-in defect incidence that certain steel mill 1580 above-mentioned produces the line same period.
Detailed description of the invention
The removing method of the belt steel surface fouling ash press-in defect that the embodiment of the present invention provides, move on steel 2160mm hot continuous rolling product line and Shoudu Iron and Steel Co capital Tang 2250 hot continuous rolling product line at Shoudu Iron and Steel Co and carried out concrete enforcement, additionally provide simultaneously and do not use removing method provided by the invention to move the reference example of steel 1580mm hot continuous rolling production line at Shoudu Iron and Steel Co, achieve the effect in anticipation.
Embodiment one: Shoudu Iron and Steel Co moves steel 2160 and produces line
Shoudu Iron and Steel Co moves steel 2160, and to produce direct cooling water quality between line frame as shown in table 1, its pH value about 8.36, total hardness 441.32mg/L, and electrical conductivity is about 1127.37uS/cm, adopts giant equipment emphasis cleaning rear portion 2 ~ 3, finish rolling district frame simultaneously.Result shows this product toe-in dirt ash press-in incidence lower than 5%.Table 1 is as follows:
Table 1
。
Embodiment two: Shoudu Iron and Steel Co capital Tang 2250 produces line
It is as shown in table 2 that Shoudu Iron and Steel Co capital Tang 2250 produces direct cooling water quality between line frame, its pH value about 7.88, total hardness 215.20mg/L, and electrical conductivity is about 1374.40uS/cm, adopts giant equipment emphasis cleaning rear portion 2 ~ 3, finish rolling district frame simultaneously.Result shows this product toe-in dirt ash press-in incidence lower than 3%.Table 2 is as follows:
Table 2
。
Reference example: Shoudu Iron and Steel Co moves steel 1580 and produces line
Shoudu Iron and Steel Co moves steel 1580, and to produce direct cooling water quality between line frame poor for a long time, as shown in table 3, and its pH value about 7.63, total hardness 663.04mg/L, electrical conductivity is about 1619.04uS/cm.Result shows this product toe-in dirt ash press-in incidence and is greater than 20%, because fouling ash is pressed into the blockade degradation rate about 3.5% seriously caused.Table 3 is as follows:
Table 3
。
After the removing method of the belt steel surface fouling ash press-in defect adopting the embodiment of the present invention to provide, fouling ash press-in incidence is reduced to less than 6%, is reduced to about 1.1% because fouling ash is pressed into the blockade degradation rate seriously caused.Water quality after improvement is as subordinate list 4, and its pH value about 8.03, total hardness 452.39mg/L, electrical conductivity is about 1130.87uS/cm.Table 4 is as follows:
Table 4
。
The removing method of the belt steel surface fouling ash press-in defect that the embodiment of the present invention provides, its principle is as follows:
1, by the foreign matter thing in XRD analysis and chemical analysis clear and definite fouling ash press-in defect be the compound of incrustation scale, dust and frame corrosion thing mutually.
First, by X-ray diffraction and chemical composition analysis, determine that the foreign matter in the press-in of fouling ash is similar to the fouling in frame, confirm that the foreign matter press-in of the type is mainly because the vibration of operation of rolling mid frame causes the fouling be attached in frame to come off to belt steel surface.Because the come off block fouling of main body that invariably accompanies of fouling is peeled off and the peeling off of the Powdered incrustation of periphery, therefore carry out forming main pit and the hangover along rolling direction at belt steel surface with rolling, form comet formation fouling ash press-in vestige.
The XRD analysis result of the main pit of fouling ash press-in defect is as shown in table 5, can find the mixture being mainly iron scale and incrustation scale in pit.Table 5 is as follows:
Table 5
。
From the chemical analysis results of incrustation scale sampling between frame, as shown in table 6, outside deironing ash, the component ratio of O, S, Mg, Ca is very large, shows that fouling is mainly the mixture of iron sheet class material and incrustation scale.
Table 6 is as follows:
Table 6
| Element | C | O | Mg | S | Cl | Ca | Fe | Add up to |
| Content | 31.75 | 1.05 | 5.45 | 2.02 | 7.88 | 51.85 | 100.00 |
Environment in operation of rolling mid frame is poor, high temperature, high humidity, Gao Chen, the fouling that in frame, on each parts, often attachment is heavier.These foulings are easy to flake-off to belt steel surface when rolling mill vibration, form fouling ash press-in defect.
2, clear and definite water quality and fouling ash are pressed into the relation between incidence
Secondly, analyzed the frequency of occurrences of comet formation foreign matter press-in defect by online surface detecting system, specify the relation of water quality and defect incidence.
Laboratory research can find, water hardness is higher, then the amount of scale after dryouting is larger.Can be clear and definite by hot rolling live data analysis, between fouling ash press-in rate and frame, directly the water quality of cooling water has obvious corresponding relation.In each parameter of water quality, the difference of pH value, total hardness, electrical conductivity several numerical value and the fouling ash difference be pressed between defect incidence have corresponding relation.Determining total hardness of water and electrical conductivity lower time, fouling ash press-in defect incidence is obviously lower.
3, the fouling that clear and definite where frame comes off affects larger on final products
Fouling ash sample between frame is got in hot rolling maintenance, and after mixed grease, block fouling is used in preparation simulation.Carry out little milling train hot rolling in laboratory and simulate 6 passes and cold rolling 5 ~ 9 passes.The different passages of hot rolling simulation place fouling sample at belt steel surface, and the pattern and the pit that are pressed into vestige after observing last pass prolong the elongation situation of rolling direction and the differentiation situation of cold rolling rear defect.
Result shows, the incrustation that places of 2 passages after hot rolling simulation, and the press-in vestige pattern after last pass is shown the press-in vestige pattern that check system observes substantially meet with on-the-spot; Can cause rolling burst during cold rolling simulation subsequently to fall into.The fouling of 4 passage press-ins above all has no significant effect band steel end product quality.Therefore, rear two frames that can specify hot continuous rolling frame are cleaning emphasis.
It should be noted last that, above detailed description of the invention is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (1)
1. a removing method for belt steel surface fouling ash press-in defect, is characterized in that, comprise:
Control the total hardness value of cooling water between hot fine rolling frame, to control the amount of scale after using described cooling water; The total hardness value controlling described cooling water is 215.20mg/L ~ 450mg/L; Control the total conductivity of described cooling water;
The pH value controlling described cooling water is alkalescent;
Adopt 2 ~ 3 frames behind giant equipment cleaning finish rolling district; The pH value controlling described cooling water is 7.85-8.50; Control the total conductivity of described cooling water at below 1400uS/cm.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5472579A (en) * | 1993-09-17 | 1995-12-05 | Hitachi, Ltd. | Hot-rolled steel strip manufacturing and descaling method and apparatus |
| CN101716596A (en) * | 2009-11-27 | 2010-06-02 | 攀钢集团攀枝花钢钒有限公司 | Temper rolling technology |
| CN102033037A (en) * | 2009-09-28 | 2011-04-27 | 无锡江南计算技术研究所 | Method for controlling quality of cooling liquid |
| CN201871535U (en) * | 2010-09-02 | 2011-06-22 | 江西铜业股份有限公司 | High-pressure latex spraying and cleaning device of roller |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62283197A (en) * | 1986-06-02 | 1987-12-09 | Nippon Parkerizing Co Ltd | Water-soluble temper-rolling agent for one-side galvanized sheet iron |
| CN2579542Y (en) * | 2002-10-17 | 2003-10-15 | 鞍钢集团新钢铁有限责任公司 | On-line forced cooling device for hot rolling steel coil |
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- 2013-02-28 CN CN201310064496.4A patent/CN103157680B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5472579A (en) * | 1993-09-17 | 1995-12-05 | Hitachi, Ltd. | Hot-rolled steel strip manufacturing and descaling method and apparatus |
| CN102033037A (en) * | 2009-09-28 | 2011-04-27 | 无锡江南计算技术研究所 | Method for controlling quality of cooling liquid |
| CN101716596A (en) * | 2009-11-27 | 2010-06-02 | 攀钢集团攀枝花钢钒有限公司 | Temper rolling technology |
| CN201871535U (en) * | 2010-09-02 | 2011-06-22 | 江西铜业股份有限公司 | High-pressure latex spraying and cleaning device of roller |
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Address after: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Beijing, No. 68, No. Patentee before: Capital Iron & Steel General Company |
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