CN103157680A - Method for eliminating shortcoming of scaling dust press-in on surface of strip steel - Google Patents
Method for eliminating shortcoming of scaling dust press-in on surface of strip steel Download PDFInfo
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- CN103157680A CN103157680A CN2013100644964A CN201310064496A CN103157680A CN 103157680 A CN103157680 A CN 103157680A CN 2013100644964 A CN2013100644964 A CN 2013100644964A CN 201310064496 A CN201310064496 A CN 201310064496A CN 103157680 A CN103157680 A CN 103157680A
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Abstract
The invention discloses a method for eliminating a shortcoming of scaling dust press-in on a surface of strip steel. The method includes the steps: controlling a gross value of hardness of cooling water between a hot mill frame and a finishing mill frame, and aiming at intensive cleaning on another two to three mill frames in a finish rolling area on a hot continuous rolling production line. The method for eliminating the shortcoming of the scaling dust press-in on the surface of the strip steel is simple, economical and efficient, and an occurrence rate of the shortcoming of the scaling dust press-in can be easily and greatly reduced through the method under the condition that production status is not affected.
Description
Technical field
The present invention relates to technical field of steel rolling, particularly a kind ofly eliminate the method that belt steel surface fouling ash is pressed into defective.
Background technology
It is a large class defective that affects strip surface quality that the SPHC Superficial Foreign Body is pressed into the class defective, shows as the indenture that auxiliary material is pressed into or the indenture that is pressed into without auxiliary material.It is because certain foreign substance falls into surface of steel plate that such defective is, and is pressed into the band steel with the operation of rolling and forms.Sample detects and to show, indenture contains when being pressed into thing, is pressed into thing and with steel matrix, distincter boundary is arranged, and the composition of foreign matter, structure are substantially different from the band steel matrix.Owing to being that foreign matter drops and is pressed into the blemish that causes with the operation of rolling, so this defective occurs over just band steel upper surface.The kind of foreign matter is various informative, comprises iron filings, greasy dirt, even nut etc. foreign material all can be used as the foreign matter source.Foreign matter be pressed into the class blemish produce reason clear and definite, be difficult for obscuring.
The SPHC Superficial Foreign Body is pressed into has a kind of fouling ash to be pressed into defective in the class defective.Such defective has " hangover " pattern that is pressed into after main body indenture and indenture, due to likeness in form " comet ", also is referred to as the comet formation foreign matter and is pressed into defective.This defective not only affects the surface quality of hot rolled thin strip, and can stay the pit vestige after pickling, can cause cold rollingly rolling leakage when serious, roll major accidents such as splitting even the high speed broken belt.
For this kind defective, domestic large multiple enterprises all adopts the mode of strengthening whole frame cleanings to be suppressed.Along with modern steel mill rhythm of production is accelerated, frame cleaning consuming time, effort contradicts with high-quality, high efficiency production gradually, causes larger difficulty for 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 that a kind of belt steel surface fouling ash is pressed into defective, the problem of consuming time, the effort that has solved that removing method that present existing belt steel surface fouling ash is pressed into defective exists.
For solving the problems of the technologies described above, the invention provides the removing method that a kind of belt steel surface fouling ash is pressed into defective, comprise:
Control the total hardness value of cooling water between the hot fine rolling frame.
Further, this removing method also comprises:
The pH value of 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:
2 ~ 3 frames behind employing giant equipment cleaning finish rolling district.
Further, control the total hardness value of described cooling water below 450mg/L.
Further, the pH value of the described cooling water of control is 7.85-8.50.
Further, control the total conductivity of described cooling water below 1400uS/cm.
Belt steel surface fouling ash provided by the invention is pressed into the removing method of defective, by controlling total hardness value, pH value and the total conductivity of cooling water between the hot fine rolling frame, and in conjunction with the emphasis cleaning of finish rolling rear portion 2 ~ 3 frames, can be under the condition that does not affect the condition of production easier decrease fouling ash be pressed into the defective incidence.
Description of drawings
Fig. 1 produces line take hardness as representing the variation of water in certain period for certain steel mill 1580;
The removing method that the belt steel surface fouling ash that Fig. 2 provides for the embodiment of the present invention is pressed into defective is applied to the fouling ash that above-mentioned certain steel mill 1580 produces line same period and is pressed into the defective incidence.
The specific embodiment
The belt steel surface fouling ash that the embodiment of the present invention provides is pressed into the removing method of defective, moving steel 2160mm hot continuous rolling at Shoudu Iron and Steel Co produces line and Shoudu Iron and Steel Co capital Tang 2250 hot continuous rollings and produces on lines and carried out concrete enforcement, also provide simultaneously and do not used 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, obtained the effect in the anticipation.
Embodiment one: Shoudu Iron and Steel Co moves steel 2160 and produces line
Shoudu Iron and Steel Co moves steel 2160 and produces that between the line frames, directly cooling water quality is as shown in table 1, its pH value approximately 8.36, and total hardness 441.32mg/L, electrical conductivity is 1127.37uS/cm approximately, adopts simultaneously giant equipment emphasis to clear up rear portion, finish rolling district 2 ~ 3 frames.Result shows that this product toe-in dirt ash is pressed into incidence lower than 5%.Table 1 is as follows:
Table 1
Embodiment two: Shoudu Iron and Steel Co capital Tang 2250 produces lines
Shoudu Iron and Steel Co capital Tang 2250 produces that between the line frames, directly cooling water quality is as shown in table 2, its pH value approximately 7.88, and total hardness 215.20mg/L, electrical conductivity is 1374.40uS/cm approximately, adopts simultaneously giant equipment emphasis to clear up rear portion, finish rolling district 2 ~ 3 frames.Result shows that this product toe-in dirt ash is pressed into 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 produces that between the line frames, directly cooling water quality is relatively poor for a long time, as shown in table 3, its pH value approximately 7.63, and total hardness 663.04mg/L, electrical conductivity is 1619.04uS/cm approximately.Result shows that this product toe-in dirt ash is pressed into incidence greater than 20%, because the fouling ash is pressed into the blockade degradation rate that seriously causes approximately 3.5%.Table 3 is as follows:
Table 3
After adopting belt steel surface fouling ash that the embodiment of the present invention provides to be pressed into the removing method of defective, the fouling ash is pressed into incidence and is reduced to below 6%, is reduced to approximately 1.1% because the fouling ash is pressed into the blockade degradation rate that seriously causes.Water quality after improvement such as subordinate list 4, its pH value approximately 8.03, total hardness 452.39mg/L, electrical conductivity is 1130.87uS/cm approximately.Table 4 is as follows:
Table 4
The belt steel surface fouling ash that the embodiment of the present invention provides is pressed into the removing method of defective, and its principle is as follows:
1, the foreign matter phase that is pressed in defective by XRD analysis and the clear and definite fouling ash of chemical analysis is the compound of incrustation scale, dust and frame corrosion thing.
At first, by X-ray diffraction and chemical composition analysis, determine that the foreign matter of fouling ash in being pressed into is similar to the fouling on frame, it is mainly that fouling because the vibration of operation of rolling mid frame causes being attached on frame comes off to belt steel surface that the foreign matter of confirming the type is pressed into.Invariably accompany that the block fouling of main body is peeled off and the peeling off of peripheral Powdered incrustation because fouling comes off, therefore form main pit and along the hangover of rolling direction, form comet formation fouling ash and be pressed into vestige at belt steel surface with rolling carrying out.
It is as shown in table 5 that the fouling ash is pressed into the XRD analysis result of defective master pit, can find to be mainly in pit the mixture of iron scale and incrustation scale.Table 5 is as follows:
Table 5
From the chemical analysis results of incrustation scale sampling between frame as can be known, as shown in table 6, outside the 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, and high temperature, high humidity, high dirt often adhere to heavier fouling on each parts in frame.These foulings are easy to flake-off to belt steel surface when rolling mill vibration, form the fouling ash and be pressed into defective.
2, clear and definite water quality and fouling ash are pressed into the relation between incidence
Secondly, analyze the frequency of occurrences that the comet formation foreign matter is pressed into defective, the relation of clear and definite water quality and defective incidence by online surface detecting system.
Laboratory research can find, water hardness is higher, and the amount of scale after dryouting is larger.Can be clear and definite by the hot rolling live data analysis, the water quality that the fouling ash is pressed into direct cooling water between rate and frame has obvious corresponding relation.In each parameter of water quality, the difference that the difference of pH value, total hardness, several numerical value of electrical conductivity and fouling ash are pressed between the defective incidence has corresponding relation.When determining total hardness of water and electrical conductivity were low, it is obviously lower that the fouling ash is pressed into the defective incidence.
3, the clear and definite fouling where frame comes off is larger on the final products impact
Fouling ash sample between frame is got in the hot rolling maintenance, the block fouling of preparation simulation after mixed grease.Carry out in the laboratory that little milling train hot rolling simulation 6 passages are rolling and cold rolling 5 ~ 9 passages are rolling.The different passages of hot rolling simulation place the fouling sample at belt steel surface, observe and are pressed into the pattern of vestige and elongation situation that pit prolongs rolling direction and the differentiation situation of cold rolling rear defective after last pass.
Result shows, the incrustation that after the hot rolling simulation, 2 passages place, and the vestige pattern that is pressed into that vestige pattern and on-the-spot table check system observe that is pressed into after last pass meets substantially; Can cause rolling burst during subsequently cold rolling simulation falls into.The fouling that front 4 passages are pressed into all has no significant effect band steel end product quality.Therefore, rear two frames that can clear and definite hot continuous rolling frame are cleaning emphasis.
It should be noted last that, the above specific embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to example, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (7)
1. a belt steel surface fouling ash is pressed into the removing method of defective, it is characterized in that, comprises:
Control the total hardness value of cooling water between the hot fine rolling frame.
2. removing method as claimed in claim 1, is characterized in that, also comprises:
The pH value of controlling described cooling water is alkalescent.
3. removing method as claimed in claim 2, is characterized in that, also comprises:
Control the total conductivity of described cooling water.
4. removing method as described in the claims 1 to 3 any one, is characterized in that, also comprises:
2 ~ 3 frames behind employing giant equipment cleaning finish rolling district.
5. removing method as described in the claims 1 to 3 any one, is characterized in that, controls the total hardness value of described cooling water below 450mg/L.
6. removing method as claimed in claim 2, is characterized in that, the pH value of controlling described cooling water is 7.85-8.50.
7. removing method as claimed in claim 3, is characterized in that, controls the total conductivity of described cooling water below 1400uS/cm.
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| CN201310064496.4A CN103157680B (en) | 2013-02-28 | 2013-02-28 | A kind of removing method of belt steel surface fouling ash press-in defect |
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Citations (6)
| 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 |
| US5472579A (en) * | 1993-09-17 | 1995-12-05 | Hitachi, Ltd. | Hot-rolled steel strip manufacturing and descaling method and apparatus |
| 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 |
| 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 |
-
2013
- 2013-02-28 CN CN201310064496.4A patent/CN103157680B/en active Active
Patent Citations (6)
| 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 |
| US5472579A (en) * | 1993-09-17 | 1995-12-05 | Hitachi, Ltd. | Hot-rolled steel strip manufacturing and descaling method and apparatus |
| 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 |
| 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 |