CN101927324A - Method and device for improving surface quality of casting belt - Google Patents
Method and device for improving surface quality of casting belt Download PDFInfo
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- CN101927324A CN101927324A CN2009100538051A CN200910053805A CN101927324A CN 101927324 A CN101927324 A CN 101927324A CN 2009100538051 A CN2009100538051 A CN 2009100538051A CN 200910053805 A CN200910053805 A CN 200910053805A CN 101927324 A CN101927324 A CN 101927324A
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Abstract
The invention discloses a method for improving the surface quality of a casting belt, which comprises the following steps: molten steel flows into the parts two crystallization rollers rotating at high speed through an immersed water gap or a flow distribution device to form a molten pool, and then is manufactured into casting belts through cooling and sight rolling of the crystallization rollers, and hot rolling and cool controlling are carried out on the casting belts until reeling; and powdery particles are sprayed on the surfaces of the crystallization rollers to form a layer of film on the surfaces of the crystallization rollers through taking inert gas with pressure as a carrier on the outer surfaces of the crystallization rollers, wherein the powdery particles can be graphite, boron nitride or molybdenum disulfide. In the invention, through surface treatment on the crystallization rollers, on one hand, the surfaces of the crystallization rollers are lubricated to avoid the defect of sticking, and on the other hand, heat transfer can be influenced on a solidification interface, thus causing interface heat transfer to be more uniform and improving the surface quality of the casting belts.
Description
Technical field
The present invention is thin strap continuous casting technology field, particularly a kind of method and device that improves surface quality of casting belt.
Background technology
In recent decades, along with the progress of continuous casting technology and the raising of on-line computer control degree, each national metallurgy industry wishes to reduce the energy consumption and the production cost of steel and iron industry always in the world, becomes the diligent target of pursuing of researchers so molten steel direct pouring can be gone out finished product.One of thin strap continuous casting principal mode is the crystallization roller of molten steel through rotating at a high speed, and is frozen into the 2-5mm Cast Strip under the effect of roll-force.
The basic craft course of thin strap continuous casting production at present is: strip caster (two rollers, single roller, tyre type)-confined chamber-kink-pinch roll-hot rolling (single chassis or two frames or nothing)-control is cold-and batches.In molten steel enters rotation through long nozzle, tundish and submersed nozzle from ladle water-cooled crystallization roller and the molten bath of side seal board formation, cooling through water-cooled crystallization roller forms the Cast Strip, by swing guide, pinch roll rollgang is delivered in the Cast Strip, through hot-rolling mill, the spray cooling, flying shear is until coiling machine.Strip continuous casting technology since have save cost, dwindle plant area, advantage such as cut down the consumption of energy, enhance productivity, this technology is just becoming the focus of each national researcher research now, also b referred to as the revolutionary technology of metallurgy industry simultaneously.
To casting process, no matter be traditional sheet billet continuous casting, or sheet billet or strip casting process, the principal element that influences the Cast Strip curdled appearance is the resistance of throwing, i.e. frictional force during relative motion between solidified shell and the crystallization roller (crystallizer).Therefore thin strap continuous casting technology more be easy to generate roll banding owing to lacked the vibration of traditional continuous casting crystallizer vibration platform and lubricating of covering slag.When the local roll banding in Cast Strip takes place, crackle, Cast Strip can occur and defective such as tear; When roll banding was serious, promptly the area of Cast Strip roll banding was bigger, and the Cast Strip adheres to roll surface and the crystallization roller can be encased, and caused crystallization roller stall, made the damage of crystallization roller apparatus.The crystallization roller is the nucleus equipment of thin strap continuous casting, and the life-span of improving the crystallization roller is the key that thin strap continuous casting reduces cost.Method commonly used in metallurgy is at crystal roller surface coating, as elements such as nickel plating, cobalts, improves the wearability of crystallization roller, but this method can not be improved the lubricated of crystal roller surface.
U.S. Pat 2004045696 has announced argon gas or nitrogen has been incorporated into crystal roller surface formation one deck air film that this air film plays the lubricated steel billet shell that solidifies, the effect that improves surface quality.
La Zuo. Streiff is at " Metallurgical and Materials Transaction B ", and Vol.31B (October 2000) has delivered on pp.1023-1030) and is entitled as: the article of " thin strap continuous casting melt and basal body interface heat transfer mechanism ".The natural deposited film that this article has proposed to utilize crystal roller surface to form can improve the heat transfer between crystallization roller and the molten steel.U.S. Pat 5720336, US6059014, US5934359, US6059014 and European patent application EP 0800881, day the present patent application JP10029047 and Chinese patent CN1263804A etc. have announced the control method of different natural deposited films.Above-mentioned these disclosed technology mainly are by the composition of control molten steel and the composition that field trash can be controlled the nature deposited film, reach the control heat transfer effect of lubricated crystal roller surface simultaneously.
U.S. Pat 6145581 and US620792B are a kind of lubricating methods to crystallization roller end face and side seal board.The common ground of two patents all is the lubricant that adds solid at end face, as: graphite, molybdenum bisuphide etc., the adding method of two patents is different with adding technology.US620792B is that particle and quick-acting binder is mixed, is sprayed onto in the side seal board slot; And US6145581 is by a pressurizing unit, adds lubricant.
Summary of the invention
For strip continuous casting technology, because setting rate is fast, cohere at crystal roller surface through regular meeting the Cast Strip of solidifying.When the local roll banding in Cast Strip takes place, crackle, Cast Strip can occur and defective such as tear; When roll banding was serious, promptly the area of Cast Strip roll banding was bigger, and the Cast Strip adheres to roll surface and the crystallization roller can be wrapped, and caused crystallization roller stall.On the other hand, because setting rate is fast, it is inhomogeneous easily to conduct heat, and causes the surface, Cast Strip to occur defectives such as crackle easily.
In existing technology, a class is to make crystal roller surface generate the nature deposited film by the composition of control molten steel and field trash.The advantage of this method is not need special installation, is that the molten steel solidification process produces.But shortcoming is a nature deposited film poor controllability, and especially few at casting film in early stage, the later stage film is many, and this has a significant impact production process, and is when especially producing different product, wayward.
Another kind of is to form air film by introducing gas at crystal roller surface, reaches lubricated effect.The problem of this method maximum is to make molten steel air-breathing easily, and is influential to the quality of product.
The purpose of this invention is to provide a kind of method and device that improves surface quality of casting belt, handle by crystal roller surface, on the one hand crystal roller surface is lubricated, avoid the roll banding defective to take place, the opposing party can be conducted heat in the freezing interface influence, make interface heat transfer more even, improve the surface quality of Cast Strip.
Technical scheme of the present invention is:
A kind of method of improving surface quality of casting belt, molten steel enter between two crystallization rollers that rotate at a high speed by submersed nozzle or current distribution device and form the molten bath, through the cooling and the slight rolling formation Cast Strip of crystallization roller, cool off until batching through hot rolling, control again; It is characterized in that spraying powdered granule as carrier to crystal roller surface by the inert gas with pressure at the outer surface of crystallization roller, described powdered granule is graphite, boron nitride or molybdenum bisuphide, crystal roller surface forms thin film.
Again, thickness 5～100 μ m of described film.
Consumption＜the 5g/m of described powdered granule
2
The granularity of described powdered granule is less than 50 μ m.
In addition, inert gas of the present invention is nitrogen or argon gas.
The pressure of inert gas is 0.2～1.2Mpa.
The present invention is used for the device that the online surface lubrication of strip casting process crystallization roller is handled, and it comprises, some discharges, nozzle is established in its end, and nozzle is arranged at crystallization roller one side that forms the top, molten bath between the two crystallization rollers respectively, arranges along crystallization roller roll surface, and, be positioned at the enclosed hood inboard; Gas pipeline, two ends connect discharge and source of the gas, and installing can controlled pressure and control valve, flowmeter, the Pressure gauge of flow respectively on the pipeline; The powder feeding device is arranged in the gas pipeline; Two brush roll are arranged at crystal roller surface.
In the strip casting process, powdered granule arrives crystal roller surface by nozzle ejection under Compressed Gas, and crystal roller surface forms thin film.By the pressure of control gas and the thickness that the powder amount is controlled film.Inert gas provides protective gas for confined chamber simultaneously, prevents the secondary oxidation of molten steel and Cast Strip effectively, reduces the thickness of iron scale, and surface quality of products is obviously improved.
The present invention and U.S. Pat 2004045696 differences are, the present invention has also applied lubricant continuously except the surface at the crystallization roller forms the air film, raising effectively surface lubricated.
U.S. Pat 5720336, US6059014, US5934359, US6059014 and European patent application EP 0800881, day the present patent application JP10029047 and Chinese CN1263804A are by the control method of nature deposited film.The present invention is not that the principle of control is different with method by the method for control nature deposited film.
Compare with U.S. Pat 6145581 and US620792B, the difference of the present invention and above-mentioned two patents is mainly reflected in:
1) purpose difference, the present invention is friction and the heat transfer that solves between Cast Strip and crystallization roller; Rather than the friction of side seal board and end face;
2) position difference.Position of the invention process is the crystallization roll surface; The enforcing location of above-mentioned patent is a crystallization roller end face;
3) equipment of Jia Ruing is different with technology.The present invention is that the solid powder is carrier by compressing other, is sprayed onto the surface of crystallization roller by nozzle; The gas that adds has the effect of lubricated and protective atmosphere.US620792B is that particle and quick-acting binder is mixed, is sprayed onto in the side seal board slot; And US6145581 is by a pressurizing unit, adds lubricant.
Major advantage of the present invention has:
1. the present invention has improved the lubricated of crystal roller surface, has reduced the friction between crystallization roller and Cast Strip, improves the service life of crystallization roller.
2. the present invention can prevent the generation of roll banding effectively, reduces the crackle on surface, improves the surface quality of Cast Strip.
3. the present invention selects different powdered lubricants according to the technology of different product, can control the process of setting of thin strap continuous casting effectively, makes interface heat transfer even, has improved the surface quality of Cast Strip.
Description of drawings
Fig. 1 is the schematic diagram of thin strap continuous casting technology of the present invention;
Fig. 2 is the schematic diagram of the online surface lubrication treating apparatus of crystallization roller of the present invention;
Fig. 3 is the schematic diagram of the online surface lubrication treating apparatus of crystallization roller of the present invention;
Fig. 4 is the uniformity that graphite improves interface heat transfer effectively;
Fig. 5 is the photo that does not spray the tissue of Cast Strip;
Fig. 6 is the photo of the tissue of Cast Strip after the graphite spraying.
The specific embodiment
Referring to Fig. 1～Fig. 3, molten steel from ladle 1 through long nozzle 2, tundish 3 and submersed nozzle 4 enter rotation water-cooled crystallization roller 5,5 ' and the molten bath 7 that forms of side seal board 6 in, form Cast Strip 8 through water-cooled crystallization roller 5,5 ' cooling, by swing guide 9, pinch roll 10 hot rolling 11 is delivered in Cast Strip 8, cool off 12 until batching 13 through control again.
After the casting beginning, open Compressed Gas control valve 16 (gas can be inert gases such as nitrogen, argon gas) respectively, according to the numerical value of flowmeter 17, the size of control valve.Aborning, according to the type adjustment control ratio of steel grade and production technology and lubricant.
Because the thickness of lubricating layer and consumption have very big influence to conducting heat and solidifying, and see Fig. 4.Therefore as requested, set pressure and the flow that sprays powdered granule in advance, and feeding coal, to guarantee the quality of product.
Embodiment 1
The composition of Compressed Gas is the nitrogen inert gas, dress graphite powder in the powder feeding device.After the casting beginning, close enclosed hood 22.Open Compressed Gas control valve 16, flowmeter 17 makes the pressure that reaches 0.4Mpa of Pressure gauge 18.Graphite arrives crystal roller surface by nozzle ejection under Compressed Gas.The THICKNESS CONTROL of graphite linings is at 30 μ m, and the consumption of graphite is controlled at 5g/m
2Inert gas provides protective gas for confined chamber simultaneously, prevents the secondary oxidation of molten steel and Cast Strip effectively, reduces the thickness of iron scale, and surface quality of products is obviously improved.Fig. 4 is the uniformity that graphite improves interface heat transfer effectively, can prevent the generation of crackle effectively.Fig. 6 is the tissue of Cast Strip after the graphite spraying.The even tissue of Cast Strip after the graphite spraying has improved the quality of Cast Strip effectively as can be seen.
The composition of Compressed Gas is the argon gas inert gas, dress boron nitride powder in the powder feeding device.After the casting beginning, close enclosed hood 22.Open Compressed Gas control valve 16, flowmeter 17 makes the pressure that reaches 0.8Mpa of Pressure gauge 18.Boron nitride arrives crystal roller surface by nozzle ejection under Compressed Gas.The THICKNESS CONTROL of boron nitride layer is at 10 μ m, consumption be controlled at 2g/m
2Boron nitride arrives crystal roller surface by nozzle ejection under Compressed Gas.Inert gas provides protective gas for confined chamber simultaneously, prevents the secondary oxidation of molten steel and Cast Strip effectively, reduces the thickness of iron scale, and surface quality of products is obviously improved.
The composition of Compressed Gas is the argon gas inert gas, dress molybdenum disulphide powder in the powder feeding device.After the casting beginning, close enclosed hood 22.Open Compressed Gas control valve 16, control valve 17 makes the pressure that reaches 1.2Mpa of Pressure gauge 18.Molybdenum bisuphide arrives crystal roller surface by nozzle ejection under Compressed Gas.The THICKNESS CONTROL of curing molybdenum layer is at 5 μ m, and the consumption of molybdenum bisuphide is controlled at 1g/m
2Molybdenum bisuphide arrives crystal roller surface by nozzle ejection under Compressed Gas.Inert gas provides protective gas for confined chamber simultaneously, prevents the secondary oxidation of molten steel and Cast Strip effectively, reduces the thickness of iron scale, and surface quality of products is obviously improved.
Claims (7)
1. method of improving surface quality of casting belt, molten steel enters two by submersed nozzle or current distribution device and forms the molten bath between the crystallization rollers of rotation at a high speed, through the cooling and the slight rolling formation Cast Strip of crystallization roller, again through hot rolling, control cooling until batching; It is characterized in that spraying powdered granule as carrier to crystal roller surface by the inert gas with pressure at the outer surface of crystallization roller, described powdered granule is graphite, boron nitride or molybdenum bisuphide; Crystal roller surface forms thin film.
2. the method for improving surface quality of casting belt as claimed in claim 1 is characterized in that, thickness 5～100 μ m of described film.
3. the method for improving surface quality of casting belt as claimed in claim 1 is characterized in that, the consumption＜5g/m of described powdered granule
2
4. the method for improving surface quality of casting belt as claimed in claim 1 is characterized in that, the granularity of described powdered granule is less than 50 μ m.
5. the method for improving surface quality of casting belt as claimed in claim 1 is characterized in that, described inert gas is nitrogen or argon gas.
6. as claim 1 or the 5 described methods of improving surface quality of casting belt, it is characterized in that the pressure of described inert gas is 0.2～1.2Mpa.
7. be used for the device that the online surface lubrication of strip casting process crystallization roller is handled, it is characterized in that, comprise,
Some discharges, nozzle is established in its end, and nozzle is arranged at crystallization roller one side that forms the top, molten bath between the two crystallization rollers respectively, arranges along crystallization roller roll surface, and, be positioned at the enclosed hood inboard;
Gas pipeline, two ends connect discharge and source of the gas, and installing can controlled pressure and control valve, flowmeter, the Pressure gauge of flow respectively on the pipeline;
The powder feeding device is arranged in the gas pipeline;
Two brush roll are arranged at crystal roller surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910053805 CN101927324B (en) | 2009-06-25 | 2009-06-25 | Method for improving surface quality of casting belt |
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| CN 200910053805 CN101927324B (en) | 2009-06-25 | 2009-06-25 | Method for improving surface quality of casting belt |
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| CN101927324A true CN101927324A (en) | 2010-12-29 |
| CN101927324B CN101927324B (en) | 2013-09-04 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106552911A (en) * | 2015-09-30 | 2017-04-05 | 宝山钢铁股份有限公司 | Thin strap continuous casting mixes the cleaning plant and method for cleaning of mao roll surface |
| CN106552907A (en) * | 2015-09-30 | 2017-04-05 | 宝山钢铁股份有限公司 | Improve the device and method of surface quality of casting belt |
| CN108057862A (en) * | 2017-12-28 | 2018-05-22 | 安徽东升精密铸钢件有限公司 | A kind of casting method of twin roll strip |
| CN111014602A (en) * | 2019-12-30 | 2020-04-17 | 中国科学院合肥物质科学研究院 | Method for preparing oxide dispersion strengthened steel by adopting front-drive powder induced nucleation through thin-strip continuous casting process |
| CN113927000A (en) * | 2020-06-29 | 2022-01-14 | 宝山钢铁股份有限公司 | Thin strip continuous casting structure and method for removing cold steel on surface of molten pool thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5077094A (en) * | 1989-12-11 | 1991-12-31 | Battelle Development Corp. | Process for applying a metal coating to a metal strip by preheating the strip in a non-oxidizing atmosphere, passing the strip through a melt pool of the metal coating material, and rapidly cooling the back surface of the strip |
| AUPP852599A0 (en) * | 1999-02-05 | 1999-03-04 | Bhp Steel (Jla) Pty Limited | Casting steel strip |
| CH692184A5 (en) * | 2000-12-30 | 2002-03-15 | Main Man Inspiration Ag | Process for operating a strip casting machine comprises introducing a controlled amount of gas during casting into an inerting chamber so that the heat transition from the strip |
-
2009
- 2009-06-25 CN CN 200910053805 patent/CN101927324B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106552911A (en) * | 2015-09-30 | 2017-04-05 | 宝山钢铁股份有限公司 | Thin strap continuous casting mixes the cleaning plant and method for cleaning of mao roll surface |
| CN106552907A (en) * | 2015-09-30 | 2017-04-05 | 宝山钢铁股份有限公司 | Improve the device and method of surface quality of casting belt |
| CN106552907B (en) * | 2015-09-30 | 2018-08-10 | 宝山钢铁股份有限公司 | Improve the device and method of surface quality of casting belt |
| CN106552911B (en) * | 2015-09-30 | 2018-08-10 | 宝山钢铁股份有限公司 | Thin strap continuous casting mixes the cleaning plant and method for cleaning of mao roll surface |
| CN108057862A (en) * | 2017-12-28 | 2018-05-22 | 安徽东升精密铸钢件有限公司 | A kind of casting method of twin roll strip |
| CN111014602A (en) * | 2019-12-30 | 2020-04-17 | 中国科学院合肥物质科学研究院 | Method for preparing oxide dispersion strengthened steel by adopting front-drive powder induced nucleation through thin-strip continuous casting process |
| CN113927000A (en) * | 2020-06-29 | 2022-01-14 | 宝山钢铁股份有限公司 | Thin strip continuous casting structure and method for removing cold steel on surface of molten pool thereof |
| CN113927000B (en) * | 2020-06-29 | 2022-12-16 | 宝山钢铁股份有限公司 | Thin strip continuous casting structure and method for removing cold steel on surface of molten pool thereof |
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| CN101927324B (en) | 2013-09-04 |
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