CN113308662B - Spraying repair method for short-edge copper plate side face of continuous casting crystallizer - Google Patents
Spraying repair method for short-edge copper plate side face of continuous casting crystallizer Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/129—Flame spraying
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/067—Metallic material containing free particles of non-metal elements, e.g. carbon, silicon, boron, phosphorus or arsenic
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/18—After-treatment
Abstract
The invention relates to a spraying repair method for the side surface of a short-side copper plate of a continuous casting crystallizer, which comprises the following specific steps: (1) rough machining; (2) flaw detection; (3) processing before spraying: the side surface of a crystallizer copper plate water tank is taken as a reference, and the whole machining and leveling are carried out; secondly, a corn milling cutter is adopted for secondary processing, so that uniform grooves with the thickness of 0.2-0.5mm are formed on the side surface; (4) pretreatment before spraying; (5) spraying: preparing a nickel-based coating on a substrate by adopting a flame spraying process; (6) heat treatment: under the protection of inert gas and the temperature of 950-1000 ℃, carrying out solid solution aging on the coating to ensure that element diffusion occurs between the coating and the matrix, thereby forming a metallurgically bonded coating; and (7) processing after heat treatment. The spray repairing method of the invention adopts a repairing method combining spray coating and heat treatment, and can effectively solve the problem of metallurgical bonding between the repairing layer and the copper matrix of the crystallizer. Meanwhile, the coating meeting the requirements of the side surface of the copper plate of the crystallizer can be prepared by matching the spraying process and the coating material.
Description
Technical Field
The invention relates to the field of metallurgical industry, in particular to a method for spraying and repairing the side surface of a short-edge copper plate of a continuous casting crystallizer.
Background
Since the era of continuous casting and rolling, the ferrous metallurgy has the essential requirements of high efficiency and good quality, and further saves the cost. The performance and the service life of the continuous casting mold, which is a core component of continuous casting equipment, are critical to the stable operation of continuous casting production. The set of slab continuous casting crystallizer consists of two long-edge copper plates and two short-edge copper plates; the short-side copper plates are harsh in use requirement, and the production and manufacturing cost is lower compared with that of the long-side copper plates, so that the short-side copper plates are mainly matched with the long-side copper plates during design and manufacturing, the short-side copper plates are seriously abraded during use, and the short-side copper plates are frequently replaced; the abrasion problem of the short-edge copper plate side surfaces (such as the surface A and the surface B shown in the figure 1) is solved through replacement and repair; in order to save cost, the problem of abrasion of the side face of the short-edge copper plate is mainly solved from the aspect of repair. The traditional method is to repair the side surface of the short-edge copper plate of the crystallizer in an electroplating mode, and the serious pollution caused by the repair method belongs to the eliminated technology. The existing repair method for the side face of the short-side copper plate of the crystallizer mainly comprises a surfacing and laser cladding process method, although a metallurgically combined repair layer can be obtained, the preparation of a defect-free repair layer on a copper substrate is very difficult (the high thermal conductivity and the high reflectivity of the copper substrate) due to the characteristics of the surfacing and laser cladding methods, and meanwhile, a local deformation condition also occurs; in addition, the repaired crystallizer copper plate needs to be remelted to restore the hardness of the copper matrix, so that the process still needs to be optimized and explored by adopting a method of repairing the side surface of the short-edge copper plate of the crystallizer by surfacing welding or laser cladding.
Disclosure of Invention
The invention aims to provide a spraying repair method for the side surface of a short-side copper plate of a continuous casting crystallizer, which can effectively solve the problem of metallurgical bonding between a repair layer and a copper matrix of the crystallizer by adopting a repair method combining spraying and heat treatment. Meanwhile, the coating meeting the requirements of the side face of the crystallizer copper plate can be prepared by matching the spraying process and the coating material, and the coating has the advantages of production efficiency and cost, so that the industrialization of the metallurgical-bonding convenient repair layer of the side face of the short-side copper plate of the crystallizer becomes possible.
The invention relates to a spraying repair method for the short-edge copper plate side surface of a continuous casting crystallizer, which comprises the following specific steps:
(1) Rough machining: cleaning and polishing the side surface of the short-edge copper plate to be repaired of the continuous casting crystallizer;
(2) Flaw detection: flaw detection is carried out on the side face of the crystallizer copper plate to be repaired;
(3) Processing before spraying: the side surface of a crystallizer copper plate water tank is taken as a reference, and the whole machining and leveling are carried out; secondly, a corn milling cutter is adopted for secondary processing, so that uniform grooves with the thickness of 0.2-0.5mm are formed on the side surface;
(4) Pretreatment before spraying: the side to be repaired is pretreated by sand blasting and shot blasting;
(5) Spraying: preparing a nickel-based coating on a substrate by adopting a flame spraying process;
(6) And (3) heat treatment: under the protection of inert gas and the temperature of 950-1000 ℃, carrying out solid solution aging on the coating to enable elements to diffuse between the coating and the substrate, thereby forming a metallurgically bonded coating;
(7) And (3) processing after heat treatment: and processing according to the size requirement of the short-side copper plate of the continuous casting crystallizer.
Further, spraying in the step (5): the nickel-based powder comprises 0.01 to 0.03% by weight of C, 0.1 to 0.5% by weight of Fe, 0.3 to 0.8% by weight of P, 1 to 2% by weight of B, 2 to 4% by weight of Si, 1 to 3% by weight of Cu, and the balance of Ni and an extremely small amount of impurities.
Further, spraying in the step (5): the particle size of the nickel-based powder is 36-106 um.
Further, spraying in the step (5): spraying parameters: the oxygen pressure is 2.0-2.6bar, the acetylene pressure is 1.0-1.5bar; the powder feeding amount is 80-100g/min; the spraying distance is 180-220mm; the speed is 12-15m/min.
Further, spraying in the step (5): adopting a flame spraying method, and carrying out reciprocating movement through a spray gun, wherein the coatings are lapped to form a crystallizer copper plate side repairing layer; the single-pass width of the spraying layer is 10-12 mm, the single-layer thickness is 0.1-0.2 mm, and the overlapping amount of the adjacent spraying layers is about 50% of the single-pass width of the spraying layer; the temperature between the sprayed layers is controlled to be lower than 100 ℃.
Further, the step (6) of heat treatment: the inert gases are nitrogen and argon.
Further, the step (7) of heat treatment post-processing: the coating thickness obtained after processing is 0.5-2mm.
Furthermore, the hardness of the side surface of the short-edge copper plate of the continuous casting crystallizer obtained after spraying and repairing is HV 120-180.
The spraying repair method has the advantages that: 1. the processing before spraying adopts the secondary processing of a corn milling cutter, so that the side surface forms uniform grooves, which is beneficial to increasing the bonding strength of the coating and the copper matrix; 2. the coating is manufactured by adopting a spraying process, so that the characteristics of high thermal conductivity and high reflectivity of a copper matrix are completely avoided, and the coating can be conveniently prepared; 3. the nickel-based powder is characterized in that the hardness is similar to that of a copper matrix, and the expansion coefficient is similar to that of the copper matrix, so that the nickel-based powder has better service performance; 4. the prepared coating can be subjected to spraying and solid solution aging treatment to prepare a coating which forms metallurgical bonding with a matrix, so that the performance of the side surface of the short-edge copper plate of the continuous casting crystallizer repaired by spraying is equivalent to that of the newly-made continuous casting crystallizer, and the coating has the advantages of production efficiency and cost.
In a word, the repairing layer obtained by the spraying repairing method is metallurgically bonded with the copper matrix of the crystallizer, the characteristics of high heat conductivity and high reflectivity of the copper material are effectively avoided, and the hardness of the repairing layer is equivalent to that of the matrix. Therefore, the repairing method has the advantages of production efficiency and cost, and the industrialization of the repairing layer of the short-side copper plate side surface of the crystallizer with metallurgical bonding becomes possible.
Drawings
FIG. 1 is a schematic shape diagram of a short-side copper plate of a continuous casting crystallizer.
FIG. 2 is a schematic shape diagram of the copper plate before spraying on the side surface of the short side of the continuous casting crystallizer.
Detailed Description
Example 1
The invention relates to a spraying repair method for the side surface of a short-side copper plate of a continuous casting crystallizer, which comprises the following specific steps:
(1) Rough machining: cleaning and polishing the side surface of the short-edge copper plate to be repaired of the continuous casting crystallizer;
(2) Flaw detection: flaw detection is carried out on the side face of the crystallizer copper plate to be repaired;
(3) Processing before spraying: the side surface of a crystallizer copper plate water tank is taken as a reference, and the whole machining and leveling are carried out; then, a corn milling cutter is adopted for secondary processing, so that uniform grooves with the thickness of 0.2-0.5mm are formed on the side surface;
(4) Pretreatment before spraying: the side to be repaired is pretreated by sand blasting and shot blasting;
(5) Spraying: preparing a nickel-based coating on a substrate by adopting a flame spraying process;
(6) And (3) heat treatment: under the protection of inert gas and the temperature of 950-1000 ℃, carrying out solid solution aging on the coating to enable elements to diffuse between the coating and the substrate, thereby forming a metallurgically bonded coating;
(7) And (3) processing after heat treatment: and processing according to the size requirement of the short-side copper plate of the continuous casting crystallizer.
In the above method: step 1 is used for removing surface oil stains on the side surface of the copper plate and preparing conditions for subsequent treatment; the step 2 is used for detecting whether the interior of the copper plate has defects or not and ensuring that only the copper plate without the defects is repaired; step 3 is used for enhancing the binding force between the coating and the substrate; step 4, removing oil stains and roughening; step 5, adopting a flame spraying process to improve the deposition efficiency, so that the interlayer stress is smaller and the sprayed layer is thicker; the function of step 6 is to increase the bonding force of the coating and the substrate.
Example 2
Step (5) during spraying: the nickel-based powder comprises 0.01 to 0.03% by weight of C, 0.1 to 0.5% by weight of Fe, 0.3 to 0.8% by weight of P, 1 to 2% by weight of B, 2 to 4% by weight of Si, 1 to 3% by weight of Cu, and the balance of Ni and an extremely small amount of impurities; the granularity of the nickel-based powder is 36-106 um; spraying parameters: the oxygen pressure is 2.0-2.6bar, the acetylene pressure is 1.0-1.5bar; the powder feeding amount is 80-100g/min; the spraying distance is 180-220mm; the speed is 12-15m/min.
The invention repairs the side surface of the short-side copper plate of the continuous casting crystallizer, requires that the coating is firmly combined with the matrix, plays a role in recovering the size, does not need to have wear resistance and corrosion resistance, and does not need to contain components such as Mo, cr and the like; therefore, the nickel-based powder has the characteristics that the hardness is similar to that of a copper matrix, and the expansion coefficient is similar to that of the copper matrix, so that the nickel-based powder has better service performance.
Example 3
The flame spraying in the step (5) comprises the following specific operations: the coating is lapped to form a crystallizer copper plate side repairing layer through the reciprocating movement of the spray gun; the single-pass width of the spraying layer is 10-12 mm, the single-layer thickness is 0.1-0.2 mm, and the overlapping amount of the adjacent spraying layers is about 50% of the single-pass width of the spraying layer; the temperature between the sprayed layers is controlled to be lower than 100 ℃. No heating is required during the spraying process, but the temperature between the sprayed layers needs to be controlled below 100 ℃ due to the continuous heat input.
The heat input of flame spraying is small, so that cracking between the coating and the matrix caused by expansion due to overheating of the matrix in the spraying process can be avoided; meanwhile, the thickness of a single layer of flame spraying can reach more than 0.1mm, and the spraying repair of the side surface of the narrow-edge crystallizer copper plate can be realized.
When flame spraying is carried out: the single-layer repairing thickness is set according to the abrasion loss of the side surface of the short-side copper plate of the crystallizer, and the single-layer width and the lap joint amount are determined by adjusting the parameters of the spraying process according to the width of the side surface of the short-side copper plate of the crystallizer. And a single spraying repair width and a corresponding lap joint amount are set in the width range of the side face of the short-side copper plate of the crystallizer, so that the complete repair of the whole side face is ensured. Thus, the production efficiency can be improved and the cost can be reduced. Meanwhile, by adopting the repairing method, the finally obtained single-layer repairing thickness is 0.5-2mm, and the service life of the crystallizer is prolonged.
Example 4
In the step (6) of heat treatment: the inert gases are nitrogen and argon.
Under the protection of nitrogen and argon, element diffusion occurs between the coating and the copper plate matrix at a certain temperature and a certain time, and then the metallurgically bonded coating is formed.
Example 5
The hardness of the side surface of the short-side copper plate of the continuous casting crystallizer obtained after spraying and repairing is HV 120-180.
After the side surface of the short-side copper plate of the continuous casting crystallizer is repaired by the spraying method, the hardness is HV 120-180, the hardness is similar to that of a copper matrix, and the expansion coefficient is close to that of the copper matrix, so that the continuous casting crystallizer has better service performance.
Claims (7)
1. The spraying repair method for the short-edge copper plate side surface of the continuous casting crystallizer comprises the following specific steps:
(1) Rough machining: cleaning and polishing the side surface of the short-edge copper plate to be repaired of the continuous casting crystallizer;
(2) Flaw detection: flaw detection is carried out on the side face of the crystallizer copper plate to be repaired;
(3) Processing before spraying: the side surface of a crystallizer copper plate water tank is taken as a reference, and the whole machining and leveling are carried out; secondly, a corn milling cutter is adopted for secondary processing, so that uniform grooves with the thickness of 0.2-0.5mm are formed on the side surface;
(4) Pretreatment before spraying: the side to be repaired is pretreated by sand blasting and shot blasting;
(5) Spraying: preparing a nickel-based coating on a substrate by adopting a flame spraying process;
(6) And (3) heat treatment: under the protection of inert gas and the temperature of 950-1000 ℃, carrying out solid solution aging on the coating to enable elements to diffuse between the coating and the substrate, thereby forming a metallurgically bonded coating;
(7) And (3) processing after heat treatment: processing according to the size requirement of the short-side copper plate of the continuous casting crystallizer;
wherein the nickel-based powder comprises 0.01 to 0.03 percent by weight of C, 0.1 to 0.5 percent by weight of Fe, 0.3 to 0.8 percent by weight of P, 1 to 2 percent by weight of B, 2 to 4 percent by weight of Si, 1 to 3 percent by weight of Cu, and the balance of Ni and a very small amount of impurities.
2. The spray repair method according to claim 1, wherein: step (5), spraying: the particle size of the nickel-based powder is 36 to 106um.
3. The spray repair method according to claim 1, wherein: step (5), spraying: spraying parameters: the oxygen pressure is 2.0-2.6bar, the acetylene pressure is 1.0-1.5bar; the powder feeding amount is 80-100g/min; the spraying distance is 180-220mm; the speed is 12-15m/min.
4. The spray repair method according to claim 1, wherein: step (5), spraying: adopting a flame spraying method, and carrying out reciprocating movement through a spray gun, wherein the coatings are lapped to form a crystallizer copper plate side repairing layer; the single-channel width of the spraying layer is 10-12mm, the single-layer thickness is 0.1-0.2mm, and the lap joint quantity of adjacent spraying layers is 50% of the single-channel width of the spraying layer; the temperature between the sprayed layers is controlled to be lower than 100 ℃.
5. The spray repair method according to claim 1, wherein: step (6) heat treatment: the inert gases are nitrogen and argon.
6. The spray repair method according to claim 1, wherein: and (7) processing after heat treatment: the thickness of the coating obtained after processing is 0.5-2mm.
7. The spray painting repair method according to any one of claims 1 to 6, wherein: and the hardness of the side surface of the short-edge copper plate of the continuous casting crystallizer obtained after spraying and repairing is HV 120-180.
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| CN113894258B (en) * | 2021-09-23 | 2023-05-12 | 泰尔(安徽)工业科技服务有限公司 | Surface coating of foot roller of continuous casting crystallizer and preparation method thereof |
| 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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| JPH11342478A (en) * | 1998-05-28 | 1999-12-14 | Fujiki Kosan Kk | Spray deposit joining method, and mold for continuous casting manufactured by it |
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| CN112176273A (en) * | 2020-09-15 | 2021-01-05 | 泰尔(安徽)工业科技服务有限公司 | Diffusion welding process for thermal spraying coating of crystallizer copper plate |
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| JPS6335762A (en) * | 1986-07-30 | 1988-02-16 | Nippon Steel Corp | Manufacture of continuous casting mold |
| JPH08225917A (en) * | 1994-10-06 | 1996-09-03 | Nippon Steel Corp | Thermal spraying method onto mold for continuous casting |
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| CN108350558A (en) * | 2015-11-10 | 2018-07-31 | 卡特彼勒公司 | Hot coating for mechanical sealing member |
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| CN111500895A (en) * | 2020-04-27 | 2020-08-07 | 龙口中宇热管理系统科技有限公司 | Metal part surface repairing material, metal part surface treatment process and application |
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| JPH11342478A (en) * | 1998-05-28 | 1999-12-14 | Fujiki Kosan Kk | Spray deposit joining method, and mold for continuous casting manufactured by it |
| CN109576628A (en) * | 2017-09-25 | 2019-04-05 | 上海宝钢工业技术服务有限公司 | The preparation method of continuous cast mold long side copper sheet composite coating |
| CN112176273A (en) * | 2020-09-15 | 2021-01-05 | 泰尔(安徽)工业科技服务有限公司 | Diffusion welding process for thermal spraying coating of crystallizer copper plate |
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