CN1781643A - Repairing method for crystallizer copper plate - Google Patents
Repairing method for crystallizer copper plate Download PDFInfo
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- CN1781643A CN1781643A CN 200410084779 CN200410084779A CN1781643A CN 1781643 A CN1781643 A CN 1781643A CN 200410084779 CN200410084779 CN 200410084779 CN 200410084779 A CN200410084779 A CN 200410084779A CN 1781643 A CN1781643 A CN 1781643A
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Abstract
The crystallizer copper plate is repaired in aerodynamic spraying process. High pressure compressed gas drives miniature metal particle to bump the surface of the crystallizer to be repaired in enough high speed so as to make the miniature metal particle produce sufficient plastic deformation for adhering onto the surface to fill crack, worn notch, etc. The process has the advantages of forming new deposited surface layer in the required shape, no change of base body and coating material oxidation caused by heat input, no structure change of the base body and coating material caused by heat input, no heat deformation of the base body caused by heat input to ensure the structure characteristic of the crystallization roller, capacity of forming coating in different thickness, and homogeneous and compact repairing layer.
Description
Technical field
The present invention relates to the steel-making continuous casting technology, particularly relate to metal continuous casting crystallizer copper coin recovery technique, also be particularly related to metal cold spraying attachment technique.
Background technology
Crystallizer is one of critical component in the metal continuous cast tandem rolling plant equipment, the particularly continuous casting of metal sheet band, thin plate, and it mainly acts on is that the strip blank with certain concreting thickness is cooled off, is frozen into to molten metal fast.The crystallizer critical component is the copper coin that contacts with molten metal, mostly adopts the Cu alloy material manufacturing.The job requirement of crystallizer is in a short period of time high temperature fluent metal to be solidified, and self bears the wearing and tearing of the etch of liquid metal and plate, band simultaneously.The copper plate of crystallizer one side contacts with molten metal, and another side is the water-cooled face.The softening point of copper alloy is about 600 ℃, and hardness is relatively low simultaneously, when abnormal conditions occurring aborning, local softening, distortion, crackle even damage takes place easily, influences cast panel, band plate type and surface quality.For this reason, re-use after need repairing crystallizer.Wearing and tearing or distortion take place in copper plate of crystallizer in normal use, when wearing and tearing acquire a certain degree can not satisfy instructions for use the time, also will repair crystallizer.
The restorative procedure of continuous casting crystallizer copper plate mainly contains built-up welding and thermal spraying at present.Often cause the selective oxidation of copper alloy in the weld deposit repairing process, between restoring area and matrix, form height and contain oxygen interface, influence the heat conductivility of crystallizer; In addition, a large amount of heat of input in the repair process makes restoring area produce bigger thermal stress, influences the serviceability of crystallizer.Moreover technique for overlaying is not suitable for repairs the crystallizer surface uniform wear.
The thermal spraying reparation is to adopt high temperature and high speed oxygen flame or high-temperature plasma bundle treating repairing area with patching material is spray deposited.These technology are exposed under the very high temperature surface that is repaired, and easily produce bigger thermal stress; And make tissue odds even owing to forming new heat treating regime in the thermal spray process, and be easy to cause thermal deformation.The thawing of metal and solidify easy generation oxidation again in the thermal spray process, the increase of oxygen content can reduce the thermal conductivity of material greatly, and also is very difficult to remove in these oxygen elements process afterwards.Airless spraying can be alleviated degree of oxidation to a certain extent, but airless spraying cost height, and be difficult to control.
Crystallizer is in use in order to improve the softening temperature and the case hardness of copper coin and molten metal contact-making surface, generally at wear-resisting Ni, Cr, Co metal or its alloy of crystallizer surface plating one deck.The existence of overlay coating makes repair difficulty more, and traditional method is the whole cars of coating are fallen or to grind off, and prepares coating then again.Repair program complexity, workload is big, the cost height.
Used many crystallizers are in order to improve heat-conducting effect, and the copper coin surface that contacts with molten metal need be prepared into special ripple or curved surface.Increased the difficulty of repair.
Summary of the invention
Defective in view of prior art, the object of the present invention is to provide a kind of continuous casting crystallizer copper plate recovery technique that is used for, to repair the wearing and tearing on copper plate of crystallizer surface, regeneration generates the surface that copper plate of crystallizer contacts with molten metal, recover crystallizer surface state and size, prolonged the service life of crystallizer.Guarantee the material of crystallizer, chemical composition, structure and surface state are identical with the original design of crystallizer, repair district's non-oxidation, and crystallization does not take place for matrix material and repair materials.
For achieving the above object, the present invention adopts the aerodynamic force spraying, spray gun is that high pressure compressed gas drives the surface that the minute metallic particle need be repaired with sufficiently high speed bump crystallizer, enough plastic deformations take place and are bonded in and form new surface on the surface of crystallizer in molecule, fill crack or wearing and tearing groove etc.
Gas pressure is greater than 1.0MPa; Be preferably 1.0MPa to 4.0Mpa.
The material of described metal particle and copper plate of crystallizer can be in full accord, also can be different.
Further, spray gun carries out three dimensions according to the copper plate of crystallizer curve form and moves, the repair surface that remains spray gun axis and copper plate of crystallizer is perpendicular, and both the spray gun axis is the normal direction of spraying point, guarantees the adhesive strength and the curve form of repairing post crystallization device copper coin of repair layer.
The metal particle composition that spraying is adopted can be copper (comprising pure Cu, AgCu alloy, CrZrCu alloy, BeNiZrCu alloy etc.) and nickel copper plate of crystallizer alloys such as (comprising nickel alloy).
The diameter range of metal particle is 1 μ m to 100 μ m.Driving gas can be nitrogen, air, helium or its mist; Gas flow 15～30g/s; Gas temperature is room temperature to 800 ℃ in spray gun.Metal particle quickens to reach sufficiently high speed by nozzle, can enough plastic deformations take place in bump and secure bond on the copper plate of crystallizer surface.
In addition, the present invention forms the effect of similar sandblast at matrix surface at the initial stage that sprays, the cleaning matrix surface.
Can heat-treat after the reparation of the present invention, also can not heat-treat.
At temperature deposit repair layer well below melting point metal.
The present invention is based on the aerodynamic force spraying technology, its principle is to utilize gases at high pressure to carry powder particle from axially entering high velocity air, produce supersonic flow by convergent-divergent pipe (superonic flow nozzzle), powder particle at the solid-state fully matrix of bump down, is deposited on matrix surface formation adhesion by producing enough big plastic deformation after the superonic flow nozzzle acceleration.
The wearing and tearing of part can be adopted fixed point reparation, and the surface that copper plate of crystallizer contacts with molten metal in use takes place all to wear and tear, and can repair on the surface that whole crystallizers contact with molten metal, make crystallizer return to design size.
The material that the present invention uses and the material of continuous casting crystallizer copper plate can be in full accord, also can be different.Can also utilize to repair to form the composition gradient zones, guarantee the composition even transition of matrix material and surfacing, improve the adhesion between matrix and the surperficial special coating.Satisfy the requirement that the wearing and tearing of different structure crystallizer are repaired fully, guarantee the heat conductivility of crystallizer.
The concrete steps of repairing are:
(1), determines the upward coating thickness of each several part of surface according to crystallizer surface abrasion condition and crystallizer surface design shape;
(2) cold spraying reparation: select the powder kind, determine technological parameter, crystallizer is repaired with cold spraying;
(3) machining: the crystallizer that produces moderate finite deformation in the use needs machining after spraying, does not need machining after less distortion and the wearing and tearing spraying.For the crystallizer that produces moderate finite deformation in using, after recess is repaired in spraying, carry out turning to high spot and handle;
(4) repair inspection, the size of the crystallizer after determining to spray is identical with former design.
The present invention has following advantage:
1. generate the new surface of regeneration,
The present invention is at the new superficial layer of the surface deposition of crystallizer, and requires to carry out disposable reparation according to the surface configuration of crystallizer, and the size of the crystallizer after the reparation is identical with former design.
2. chemical composition and the tissue signature to thin band continuous casting crystallization roller do not have influence,
The present invention is at the temperature deposit repair layer well below melting point metal, and matrix is not had heat affecting, can not cause the change of chemical composition because of the heat input causes the oxidation of matrix material and coating self material; Can not cause matrix material and coating self material structure to change because of the heat input yet; Can not guarantee the architectural characteristic of crystallization roller simultaneously because of the heat input causes the distortion of matrix generation heat expansion yet.
3. the thickness of coating can be regulated.The present invention can realize different coating layer thicknesses by regulating spray time.
4. repair layer densification.The present invention is the repair layer that supersonic speed particles hit matrix surface forms, the inner even compact of repair layer.
5. the present invention can make reducing metal or alloy be deposited on matrix surface effectively at the temperature deposit repair layer well below melting point metal, can eliminate the adsorb oxygen layer of matrix surface, improves the adhesion between repair layer and the matrix.
Description of drawings
Fig. 1 is the embodiment of the invention 1 a coating microstructure SEM shape appearance figure;
Fig. 2 is the inner SEM shape appearance figure of the embodiment of the invention 1 coating;
Fig. 3 is the embodiment of the invention 2 coating section SEM shape appearance figures;
Fig. 4 is the embodiment of the invention 2 coating microcosmic SEM shape appearance figures;
Fig. 5 is the embodiment of the invention 3 coating section SEM shape appearance figures;
Fig. 6 is the embodiment of the invention 4 overbrushing layer section SEM shape appearance figures.
The specific embodiment
Embodiment 1: repair dull and stereotyped copper plate of crystallizer.
Adopt the method for cold air power spraying and coating, utilize compressed nitrogen carry copper powder with supersonic spray coating in the molten steel crystallizer surface, repair crystallizer wearing and tearing groove.Mean particle dia is 40-60 μ m.Spraying AgCu renovation technique: spray distance 20mm, gas pressure 4MPa, 200 ℃ of gas temperatures, gas flow 15g/s, metallic particles speed 400m/s;
1AgCu coating SEM pattern embodiment illustrated in fig. 1, as can be seen in former copper plate of crystallizer surface adhesion the thick AgCu alloy coat of one deck 0.3mm.Coating even compact as can be seen, interface be in conjunction with firmly, closely contacts between coating and the matrix, and be seamless, formed good heat-transfer surface repair layer.Repairing effect is good.
Figure 2 shows that the microstructure pattern of embodiment 1AgCu alloy coat after corrosion.As seen cold spraying coating is the cold deformation tissue, and crystal grain obviously is narrower than matrix material, coating interior solid degree height, and the non-oxidation phenomenon be can't see the vestige of sprayed particle.Coating combines firmly with interface between the matrix, and the imporosity exists.
Embodiment 2: repair the funnel copper plate of crystallizer.
Experimental procedure is with embodiment 1.The material of selecting is CrZrCu, and the diameter of particulate is: 30-40 μ m, renovation technique: spray distance 15mm, gas pressure 3.8MPa, 600～800 ℃ of gas temperatures, gas flow 20g/s, metallic particles speed 800m/s; Require spray gun perpendicular with the curved surface of copper plate of crystallizer all the time in the repair process, guarantee adhesion strength.
CrZrCu coating section SEM shape appearance figure shown in Figure 3, the arrow mark of the interface between matrix and the coating.Coating even compact as can be seen, the interface is also not obvious in the high power microscopic observation, illustrates between CrZrCu coating and the steel substrate closely to contact, and has formed good heat-transfer surface repair layer.The material of funnel copper plate of crystallizer is the CrZrCu alloy also, and the composition of coating and tissue are fully close with matrix after reparation, and the interface does not almost observe, visible cold spraying repairing effect excellence.
Fig. 4 is the internal structure of coating, the inner even compact of visible coating, imporosity.Grain size less than spraying before size of microcrystal in the particle, show that in spraying process material has the trend of further refinement, this will further improve the mechanical property of coating.
Embodiment 3: repair the round mold copper coin
Experimental procedure is with embodiment 1.The material of selecting is the AgCu alloy, and the diameter of particulate is: 20-30 μ m, renovation technique: spray distance 20mm, gas pressure 2.5MPa, gas temperature room temperature, gas flow 30g/s, metallic particles speed 700m/s; Require spray gun perpendicular with the curved surface of copper plate of crystallizer all the time in the repair process, guarantee adhesion strength.
AgCu coating section SEM shape appearance figure shown in Figure 5, matrix combines firmly with interface between the coating.Coating even compact as can be seen, the imporosity exists, and illustrates between AgCu alloy coat and the matrix closely to contact, and has formed good heat-transfer surface repair layer.Played the effect that forms new reparation surface of repairing.
Embodiment 4 repairs the funnel-type crystallizer copper coin
Experimental procedure is with embodiment 1, and different is to select two kinds of material preparation composite coatings.Outwards be followed successively by from matrix: the AgCu alloy (diameter of particulate is: 30-40 μ m) and nickel alloy (diameter of particulate is: 80-100 μ m).AgCu spray coating alloy parameter: spray distance 20mm, gas pressure 3.0MPa, gas temperature room temperature, gas flow 30g/s, metallic particles speed 600m/s; The nickel alloy spray parameters: spray distance 5mm, gas pressure 2.0MPa, gas temperature are room temperature, gas flow 20g/s, metallic particles speed 1000m/s.
Two kinds of coating section SEM shape appearance figures shown in Figure 6 because matrix material is the CrZrCu alloy, so matrix is very firm with combining of coating after the cold spraying, but can clearly be found out the interface between matrix and the AgCu alloy coat.The inner even compact of coating illustrates between CrZrCu coating and the matrix closely to contact, and has formed good heat-transfer surface coating.The density of nickel-alloy coating is also very high, with AgCu alloy coat strong bonded, even tissue.Interface between each coating is in conjunction with firm.The thickness difference of each coating can be regulated arbitrarily as required.
Claims (14)
1. repairing method for crystallizer copper plate, it is characterized in that: copper plate of crystallizer is motionless, adopt the method for aerodynamic force spraying, spray gun utilizes Compressed Gas to carry the reparation surface of metal particle with ultrasonic speed bump copper plate of crystallizer, produce enough plastic deformations and be bonded in the reparation surface of copper plate of crystallizer, form repair layer.
2. repairing method for crystallizer copper plate according to claim 1, it is characterized in that: spray gun carries out three dimensions according to the copper plate of crystallizer curve form and moves, the repair surface that remains spray gun axis and copper plate of crystallizer is perpendicular, be the normal direction of spray gun axis, guarantee the adhesive strength and the curve form of repairing post crystallization device copper coin of repair layer for the spraying point.
3. repairing method for crystallizer copper plate according to claim 1 is characterized in that: the diameter range of described metal particle is 1 μ m to 100 μ m.
4. repairing method for crystallizer copper plate according to claim 1 and 2 is characterized in that: described gas can be nitrogen, air, helium or its mist.
5. repairing method for crystallizer copper plate according to claim 1 is characterized in that: described gas pressure is greater than 1.0MPa.
6. repairing method for crystallizer copper plate according to claim 1 is characterized in that: described gas pressure is preferably 1.0MPa to 4.0MPa.
7. repairing method for crystallizer copper plate according to claim 1 is characterized in that: described gas flow is 15～30g/s.
8. repairing method for crystallizer copper plate according to claim 1 is characterized in that: described gas temperature is room temperature to 800 ℃ in spray gun.
9. according to claim 1 or 3 described repairing method for crystallizer copper plate, it is characterized in that: the material of the material copper plate of crystallizer that described metal particle uses is in full accord.
10. according to claim 1 or 3 described repairing method for crystallizer copper plate, it is characterized in that: the material that described metal particle uses comprises alloys such as fine copper Cu, yellow gold (AgCu), chrome zirconium copper alloy (CrZrCu), beryllium nickel zirconium copper alloy (BeNiZrCu) or nickel alloy.
11. repairing method for crystallizer copper plate according to claim 1 is characterized in that: can also form the composition gradient transition zone.
12. repairing method for crystallizer copper plate according to claim 1 is characterized in that: spray distance 5～30mm between described spray gun and the matrix.
13. repairing method for crystallizer copper plate according to claim 1 is characterized in that: the spraying initial stage forms the effect of similar sandblast at matrix surface, the cleaning matrix surface.
14. repairing method for crystallizer copper plate according to claim 1 is characterized in that: heat-treat after the reparation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 200410084779 CN1781643A (en) | 2004-11-30 | 2004-11-30 | Repairing method for crystallizer copper plate |
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| CN 200410084779 CN1781643A (en) | 2004-11-30 | 2004-11-30 | Repairing method for crystallizer copper plate |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101333637B (en) * | 2007-06-25 | 2010-07-28 | 宝山钢铁股份有限公司 | Process for repairing continuous casting crystal roller |
| CN102189370A (en) * | 2010-03-04 | 2011-09-21 | 宝山钢铁股份有限公司 | Cold spray repairing method for crystallizer copper plate |
| CN103302442A (en) * | 2013-06-18 | 2013-09-18 | 青岛云路新能源科技有限公司 | Method for repairing surface of copper roller of amorphous nanocrystalline crystallizer |
| CN102039384B (en) * | 2009-10-23 | 2013-09-25 | 宝山钢铁股份有限公司 | Manufacturing method of composite coating layer on surface of high-resistant crystallizer or crystallizing roller |
| CN104372332A (en) * | 2013-08-13 | 2015-02-25 | 宝山钢铁股份有限公司 | Crystallizer cold spraying integral repairing method and special clamping device for corner processing |
| CN105780063A (en) * | 2016-05-19 | 2016-07-20 | 西峡龙成特种材料有限公司 | Repairing method of scrapped continuous casting crystallizer copper plate |
| CN111676376A (en) * | 2020-07-22 | 2020-09-18 | 遵义新利特金属材料科技有限公司 | Connecting device for crystallizer and electrode |
| CN113369653A (en) * | 2021-06-16 | 2021-09-10 | 辽宁石油化工大学 | Method for repairing arc ablation pit of bottom plate of metallurgical crystallizer |
| CN114682991A (en) * | 2022-04-26 | 2022-07-01 | 昆明理工大学 | Repairing method of copper crystallizer for EB furnace |
-
2004
- 2004-11-30 CN CN 200410084779 patent/CN1781643A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101333637B (en) * | 2007-06-25 | 2010-07-28 | 宝山钢铁股份有限公司 | Process for repairing continuous casting crystal roller |
| CN102039384B (en) * | 2009-10-23 | 2013-09-25 | 宝山钢铁股份有限公司 | Manufacturing method of composite coating layer on surface of high-resistant crystallizer or crystallizing roller |
| CN102189370A (en) * | 2010-03-04 | 2011-09-21 | 宝山钢铁股份有限公司 | Cold spray repairing method for crystallizer copper plate |
| CN102189370B (en) * | 2010-03-04 | 2012-12-12 | 宝山钢铁股份有限公司 | Cold spray repairing method for crystallizer copper plate |
| CN103302442A (en) * | 2013-06-18 | 2013-09-18 | 青岛云路新能源科技有限公司 | Method for repairing surface of copper roller of amorphous nanocrystalline crystallizer |
| CN104372332B (en) * | 2013-08-13 | 2017-06-06 | 宝山钢铁股份有限公司 | Crystallizer cold spraying integral restoration method and corner treatment Special clamping device |
| CN104372332A (en) * | 2013-08-13 | 2015-02-25 | 宝山钢铁股份有限公司 | Crystallizer cold spraying integral repairing method and special clamping device for corner processing |
| CN105780063A (en) * | 2016-05-19 | 2016-07-20 | 西峡龙成特种材料有限公司 | Repairing method of scrapped continuous casting crystallizer copper plate |
| CN105780063B (en) * | 2016-05-19 | 2018-04-06 | 西峡龙成特种材料有限公司 | A kind of restorative procedure for scrapping continuous casting crystallizer copper plate |
| CN111676376A (en) * | 2020-07-22 | 2020-09-18 | 遵义新利特金属材料科技有限公司 | Connecting device for crystallizer and electrode |
| CN113369653A (en) * | 2021-06-16 | 2021-09-10 | 辽宁石油化工大学 | Method for repairing arc ablation pit of bottom plate of metallurgical crystallizer |
| CN113369653B (en) * | 2021-06-16 | 2022-09-27 | 辽宁石油化工大学 | Method for repairing arc ablation pit of bottom plate of metallurgical crystallizer |
| CN114682991A (en) * | 2022-04-26 | 2022-07-01 | 昆明理工大学 | Repairing method of copper crystallizer for EB furnace |
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