CN113894258B - Surface coating of foot roller of continuous casting crystallizer and preparation method thereof - Google Patents
Surface coating of foot roller of continuous casting crystallizer and preparation method thereof Download PDFInfo
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- CN113894258B CN113894258B CN202111116827.5A CN202111116827A CN113894258B CN 113894258 B CN113894258 B CN 113894258B CN 202111116827 A CN202111116827 A CN 202111116827A CN 113894258 B CN113894258 B CN 113894258B
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- 238000000576 coating method Methods 0.000 title claims abstract description 52
- 239000011248 coating agent Substances 0.000 title claims abstract description 50
- 238000009749 continuous casting Methods 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title abstract description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical group [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000000843 powder Substances 0.000 claims abstract description 25
- 238000005507 spraying Methods 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000002344 surface layer Substances 0.000 claims abstract description 21
- 238000007514 turning Methods 0.000 claims abstract description 21
- 239000010410 layer Substances 0.000 claims abstract description 19
- 230000037452 priming Effects 0.000 claims abstract description 15
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 13
- 239000000956 alloy Substances 0.000 claims abstract description 13
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 12
- 230000003213 activating effect Effects 0.000 claims abstract description 10
- 238000004140 cleaning Methods 0.000 claims abstract description 10
- 239000000126 substance Substances 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 5
- 238000003754 machining Methods 0.000 claims abstract description 4
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims abstract description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 230000007547 defect Effects 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 238000010285 flame spraying Methods 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- 238000005488 sandblasting Methods 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000007761 roller coating Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D1/00—Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
- C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
- C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
- C22C29/08—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds based on tungsten carbide
-
- 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
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)
- Coating By Spraying Or Casting (AREA)
Abstract
The invention discloses a surface coating of a foot roller of a continuous casting crystallizer, which consists of a priming layer and a surface layer; the priming layer is nickel-based alloy powder with the thickness of 0.1-0.2mm; the surface layer is nickel-based tungsten carbide alloy powder with the thickness of 1-3mm. Wherein, the chemical components and the mass percentages of the priming layer are as follows: 0.01-0.03% of C, 0.3-1% of Fe, 2-3% of Si, 1-3% of B and the balance of Ni; the surface layer comprises the following chemical components in percentage by mass: 0.1-0.4% of C, 0.3-1% of Fe, 2-3% of Si, 1-3% of B, 10-30% of W, 5-10% of Cr, 0.5-1% of rare earth element and the balance of Ni. The invention also discloses a preparation method of the surface coating of the foot roller of the continuous casting crystallizer, which comprises the following specific steps: the method comprises the steps of (1) turning (2) flaw detection (3) thread turning (4) cleaning, activating (5) spraying (6) remelting (7) finish machining. The foot roller of the continuous casting crystallizer is reinforced by spraying and remelting, so that metallurgical bonding is formed between the surface coating and the matrix, the stable coating performance can be ensured, the performances of wear resistance, cold and hot fatigue and the like are improved, and the service life of the foot roller of the continuous casting crystallizer is prolonged.
Description
Technical Field
The invention relates to the field of material surface modification and metallurgical industry, in particular to a powder material for a continuous casting crystallizer foot roll coating and a coating preparation method.
Background
Continuous casting is one of the advanced technologies in the field of modern metallurgical industry, a crystallizer is called a heart of a continuous casting production line, and a foot roller of the continuous casting crystallizer is an important transmission part at the lower end of the crystallizer, and the quality of the foot roller directly influences the quality of billets and the production efficiency of a continuous casting machine. Because the steel billet is in a red-hot state when passing through the crystallizer foot roller, the liquid core is contained in the shell, the crystallizer foot roller is subjected to friction with the steel billet and high temperature in the transmission process, and meanwhile, the crystallizer foot roller is continuously subjected to cold-hot circulation along with spraying of secondary cooling water. Therefore, the failure mode of the foot roller is mainly abrasion and surface cracking and falling caused by fatigue.
In order to solve the problems, the conventional means at present is to prepare an iron-based alloy coating on the surface of the foot roller by adopting a build-up welding method: the common alloy welding wires are made of stainless steel materials such as 430 and 414N. However, the heat input in the surfacing process is large, so that the surfacing process is easy to generate large deformation, the dilution rate is large, and meanwhile, the large heat input also causes coarse grains and the mechanical property is reduced. But the thermal spray coating is difficult to adapt to severe environments because it presents a typical layered structure and is physically bonded to the substrate. Therefore, how to improve the performance of the surface of the foot roller of the continuous casting crystallizer is particularly important for reducing the cost and enhancing the efficiency of iron and steel enterprises.
Disclosure of Invention
The invention aims to solve the problem of providing a surface coating of a foot roller of a continuous casting crystallizer and a preparation method thereof. The foot roller of the continuous casting crystallizer is reinforced by spraying and remelting, so that metallurgical bonding is formed between the surface coating and the matrix, the stable coating performance can be ensured, the performances of wear resistance, cold and hot fatigue and the like are improved, and the service life of the foot roller of the continuous casting crystallizer is prolonged.
The invention relates to a surface coating of a foot roller of a continuous casting crystallizer, which consists of a priming layer and a surface layer; the priming layer is nickel-based alloy powder with the thickness of 0.1-0.2mm; the surface layer is nickel-based tungsten carbide alloy powder with the thickness of 1-3mm.
Further, the chemical components and mass percentages of the priming layer are as follows: 0.01-0.03% of C, 0.3-1% of Fe, 2-3% of Si, 1-3% of B and the balance of Ni; the surface layer comprises the following chemical components in percentage by mass: 0.1-0.4% of C, 0.3-1% of Fe, 2-3% of Si, 1-3% of B, 10-30% of W, 5-10% of Cr, 0.5-1% of rare earth element and the balance of Ni.
The invention relates to a preparation method of a surface coating of a foot roller of a continuous casting crystallizer, which comprises the following specific steps:
(1) Turning: turning a foot roller blank of the crystallizer until the outer diameter of the turning is smaller than the final size of the roller by 1-2mm; turning the inner hole to be smaller than the final inner hole of the roller by 2-5mm; turning to a length 3-5mm greater than the final dimension of the roller;
(2) Flaw detection: flaw detection is carried out on the turned crystallizer foot roller, so that the turned roller is ensured to have no defects such as cracks, air holes and the like;
(3) And (3) threading: machining by adopting a thread cutter to form right-angle threads on the roller surface;
(4) Cleaning and activating: cleaning greasy dirt, and activating the threaded surface by adopting a sand blasting method;
(5) Spraying: preparing a coating on the right-angle thread surface by adopting a flame spraying method, wherein the bottom layer is 0.1-0.2mm, and the surface layer is 1-3mm;
(6) Remelting: feeding into a furnace for integral remelting;
(7) And (3) finishing: the crystallizer foot roll is processed to size requirements.
Further, turning in the step (1): the blank processing is performed according to the product specification and the finished product size, the outer diameter is processed according to the thickness of the coating removed by the finished product, and the inner hole is processed according to the processing allowance of 2-5mm reserved at the minimum inner diameter of the finished product.
Further, the step (3) is threaded: the pitch of the thread is 2-4mm, and the depth of the thread is 0.3-0.5mm.
Further, cleaning and activating in the step (4): the roller surface is fully activated by diamond iron sand.
Further, the particle size of both the top layer powder and the bottom layer powder is 53-150um.
Further, spraying in the step (5): primer technological parameters: the linear speed of the workpiece is 30-35m/min, the spraying distance is 150-200mm, the spraying step distance is 6-10mm/r, the acetylene is 20-30NLPM, the oxygen is 20-40NLPM, and the powder feeding rate is 80-100g/min; surface layer process parameters: the linear speed of the workpiece is 10-15m/min, the spraying distance is 150-200mm, the spraying step distance is 6-10mm/r, the acetylene is 20-30NLPM, the oxygen is 20-40NLPM, and the powder feeding rate is 80-100g/min.
Further, remelting in the step (6): remelting the whole body by adopting a vacuum furnace, wherein the vacuum degree in the remelting process is less than 10 -2 Pa, the temperature is 900-1100 ℃, and the heat preservation time is 30-60min.
Compared with the prior art, the invention has the advantages that: 1. the surface coating is divided into a priming layer and a surface layer, the self-solubility and wettability of the nickel-based alloy and the wear resistance and thermal fatigue performance of the nickel-based WC coating are fully utilized, and the bonding strength and the wear resistance and the thermal fatigue performance required by the coating are considered; 2. the nickel-based WC composite coating has high wear resistance and thermal fatigue resistance, and the powder contains 2-3% of Si and 1-3% of B, so that on one hand, the melting point of the powder is reduced, the feasibility of a remelting process is ensured, and on the other hand, the formation of fine eutectic Cr in the remelting process is ensured 7 C 3 、Ni 3 B and the like are dispersed and distributed in the solid solution, so that the structure and the performance of the coating are effectively improved; 3. the rare earth elements in the nickel-based WC alloy powder play roles in refining grains and purifying grain boundaries in the remelting process, so that the oxidation resistance and ductility of the alloy are enhanced, and the powder has excellent wear resistance and toughness; 4. the whole vacuum heating remelting is adopted, so that metallurgical bonding between the coating and the substrate is ensured, meanwhile, oxidation phenomenon between the coatings in the remelting process is avoided, and inter-crystal oxidation between the coatings is avoided. In a word, the continuous casting crystallizer foot roller prepared by the preparation method of the invention effectively gives consideration to the bonding strength of the coating and the matrix, the wear resistance and the thermal fatigue performance of the coating, the hardness of the coating is about HRC45, and the service life of the coating is prolonged by 5 times compared with that of a surfacing foot rollerThe above.
Detailed Description
Example 1
The invention relates to a surface coating of a foot roller of a continuous casting crystallizer, which consists of a priming layer and a surface layer; the priming layer is nickel-based alloy powder with the thickness of 0.1-0.2mm; the surface layer is nickel-based tungsten carbide alloy powder with the thickness of 1-3mm.
Wherein, the chemical components and the mass percentages of the priming layer are as follows: 0.01-0.03% of C, 0.3-1% of Fe, 2-3% of Si, 1-3% of B and the balance of Ni; the surface layer comprises the following chemical components in percentage by mass: 0.1-0.4% of C, 0.3-1% of Fe, 2-3% of Si, 1-3% of B, 10-30% of W, 5-10% of Cr, 0.5-1% of rare earth element and the balance of Ni.
Example 2
The invention relates to a preparation method of a continuous casting crystallizer foot roller surface coating, which comprises the following specific steps:
(1) Turning: turning a foot roller blank of the crystallizer until the outer diameter of the turning is smaller than the final size of the roller by 1-2mm; turning the inner hole to be smaller than the final inner hole of the roller by 2-5mm; turning to a length 3-5mm greater than the final dimension of the roller;
(2) Flaw detection: flaw detection is carried out on the turned crystallizer foot roller, so that the turned roller is ensured to have no defects such as cracks, air holes and the like;
(3) And (3) threading: machining by adopting a thread cutter to form right-angle threads on the roller surface;
(4) Cleaning and activating: cleaning greasy dirt, and activating the threaded surface by adopting a sand blasting method;
(5) Spraying: preparing a coating on the right-angle thread surface by adopting a flame spraying method, wherein the bottom layer is 0.1-0.2mm, and the surface layer is 1-3mm;
(6) Remelting: feeding into a furnace for integral remelting;
(7) And (3) finishing: the crystallizer foot roll is processed to size requirements.
Wherein: turning in the step (1): the blank processing is performed according to the product specification and the finished product size, the outer diameter is processed according to the thickness of the coating removed by the finished product, and the inner hole is processed according to the processing allowance of 2-5mm reserved at the minimum inner diameter of the finished product.
Wherein, step (3) threading: the pitch of the thread is 2-4mm, and the depth of the thread is 0.3-0.5mm. The purpose of the thread turning is to increase the bond strength between the coating and the substrate during spraying and remelting.
Wherein, step (4) cleaning and activating: the roller surface is fully activated by diamond iron sand.
Wherein, step (5) spraying: the granularity of the surface layer powder and the priming powder is 53-150um.
Wherein, step (5) spraying: primer technological parameters: the linear speed of the workpiece is 30-35m/min, the spraying distance is 150-200mm, the spraying step distance is 6-10mm/r, the acetylene is 20-30NLPM, the oxygen is 20-40NLPM, and the powder feeding rate is 80-100g/min; surface layer process parameters: the linear speed of the workpiece is 10-15m/min, the spraying distance is 150-200mm, the spraying step distance is 6-10mm/r, the acetylene is 20-30NLPM, the oxygen is 20-40NLPM, and the powder feeding rate is 80-100g/min.
Wherein, step (6) remelting: remelting the whole body by adopting a vacuum furnace, wherein the vacuum degree in the remelting process is less than 10 -2 Pa, the temperature is 900-1100 ℃, and the heat preservation time is 30-60min. The remelting improves the bonding strength of the coating and the matrix and the internal quality of the coating, and improves the service performance of the coating.
When 42CrMo is adopted for the continuous casting crystallizer foot roller matrix, the performance of a build-up layer obtained by adopting a traditional build-up process is compared with that of a coating obtained by adopting the process:
thermal shock test: sample (specification)
) Placing into a muffle furnace at 500 ℃, preserving heat for 15min, taking out, rapidly placing into clear water at room temperature, and repeating the steps. The number of times that a macrocrack was first found was defined as the number of crack initiation. The performance pair is shown in table 1.
TABLE 1
| Coating type | Number of crack initiation | Surface state |
| Build-up welding coating | 50 | Visible microcracks |
| Coating according to the invention | 100 | No crack |
(II) abrasion test: the method is carried out on a high-temperature end face friction and wear testing machine, the testing temperature is 500 ℃, and the adopted friction pair is quenched grinding tool steel. And comparing the weightlessness conditions under the same working condition and time. The performance pair is shown in table 2.
TABLE 2
The experimental data show that the continuous casting crystallizer foot roller coating layer has good fatigue resistance and wear resistance.
The continuous casting crystallizer foot roller prepared by the preparation method provided by the invention has the advantages that the bonding strength of the coating and the matrix, the wear resistance and the thermal fatigue performance of the coating are effectively considered, and the hardness of the coating is about HRC 45. When the steel is used in the continuous casting medium plate factory, the steel passing amount is more than 60 ten thousand tons, no obvious abrasion and cracks appear, and the service life is prolonged by more than 5 times compared with the surfacing welding.
Claims (7)
1. The surface coating of the foot roller of the continuous casting crystallizer is characterized in that: it consists of a priming layer and a surface layer; the priming layer is nickel-based alloy powder with the thickness of 0.1-0.2mm; the surface layer is nickel-based tungsten carbide alloy powder with the thickness of 1-3mm; the chemical components and mass percentages of the priming layer are as follows: 0.01-0.03% of C, 0.3-1% of Fe, 2-3% of Si, 1-3% of B and the balance of Ni; the surface layer comprises the following chemical components in percentage by mass: 0.1-0.4% of C, 0.3-1% of Fe, 2-3% of Si, 1-3% of B, 10-30% of W, 5-10% of Cr, 0.5-1% of rare earth element and the balance of Ni.
2. The surface coating of the foot roller of the continuous casting crystallizer according to claim 1, which is prepared by the following specific steps:
(1) Turning: turning a foot roller blank of the crystallizer until the outer diameter of the turning is smaller than the final size of the roller by 1-2mm; turning the inner hole to be smaller than the final inner hole of the roller by 2-5mm; turning to a length 3-5mm greater than the final dimension of the roller;
(2) Flaw detection: flaw detection is carried out on the turned crystallizer foot roller, so that the turned roller is ensured to have no defects such as cracks, air holes and the like;
(3) And (3) threading: machining by adopting a thread cutter to form right-angle threads on the roller surface;
(4) Cleaning and activating: cleaning greasy dirt, and activating the threaded surface by adopting a sand blasting method;
(5) Spraying: preparing a coating on the right-angle thread surface by adopting a flame spraying method, wherein the bottom layer is 0.1-0.2mm, and the surface layer is 1-3mm;
(6) Remelting: feeding into a furnace for integral remelting; remelting the whole body by adopting a vacuum furnace, wherein the vacuum degree in the remelting process is less than 10 -2 Pa, the temperature is 900-1100 ℃, and the heat preservation time is 30-60min;
(7) And (3) finishing: the crystallizer foot roll is processed to size requirements.
3. The surface coating according to claim 2, characterized in that: turning in the step (1): the blank processing is performed according to the product specification and the finished product size, the outer diameter is processed according to the thickness of the coating removed by the finished product, and the inner hole is processed according to the processing allowance of 2-5mm reserved at the minimum inner diameter of the finished product.
4. The surface coating according to claim 2, characterized in that: and (3) threading: the pitch of the thread is 2-4mm, and the depth of the thread is 0.3-0.5mm.
5. The surface coating according to claim 2, characterized in that: and (4) cleaning and activating: the roller surface is fully activated by diamond iron sand.
6. The surface coating according to claim 2, characterized in that: the granularity of the surface layer powder and the priming powder is 53-150um.
7. The surface coating according to claim 2, characterized in that: and (5) spraying: primer technological parameters: the linear speed of the workpiece is 30-35m/min, the spraying distance is 150-200mm, the spraying step distance is 6-10mm/r, the acetylene is 20-30NLPM, the oxygen is 20-40NLPM, and the powder feeding rate is 80-100g/min; surface layer process parameters: the linear speed of the workpiece is 10-15m/min, the spraying distance is 150-200mm, the spraying step distance is 6-10mm/r, the acetylene is 20-30NLPM, the oxygen is 20-40NLPM, and the powder feeding rate is 80-100g/min.
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| FR2695142B1 (en) * | 1992-08-27 | 1994-11-04 | Europ Gas Turbines Sa | Anti-wear cobalt coating of a nickel alloy part. |
| US5499672A (en) * | 1994-06-01 | 1996-03-19 | Chuetsu Metal Works Co., Ltd. | Mold for continuous casting which comprises a flame sprayed coating layer of a tungsten carbide-based wear-resistant material |
| JP4027153B2 (en) * | 2002-05-09 | 2007-12-26 | 新日本製鐵株式会社 | Coating method for continuous casting mold |
| CN101020998A (en) * | 2007-03-21 | 2007-08-22 | 山东大学 | Process of flame spray coating heat resistant antiwear alloy onto red copper surface |
| CN201338080Y (en) * | 2008-10-27 | 2009-11-04 | 上海宝钢设备检修有限公司 | Continuous casting mold copper plate or copper tube |
| CN101798669B (en) * | 2009-02-06 | 2011-07-20 | 上海宝钢设备检修有限公司 | Method for thermally spraying protective coating on surface of copper plate of continuous casting crystallizer |
| CN101532133B (en) * | 2009-04-21 | 2011-05-18 | 广州有色金属研究院 | Copper-base crystallizer surface laser cladding method |
| CN102851632A (en) * | 2012-10-11 | 2013-01-02 | 江苏科技大学 | Method for preparing high-temperature wear-resistant coating on continuous casting crystallizer copper alloy plate surface |
| CN103834896A (en) * | 2012-11-21 | 2014-06-04 | 上海宝钢工业技术服务有限公司 | Continuous casting crystallizer long-side copper plate coating thermal spraying method |
| CN106381488B (en) * | 2015-07-31 | 2019-12-06 | 上海宝钢工业技术服务有限公司 | Preparation method of continuous casting crystallizer foot roller coating |
| CN106077618A (en) * | 2016-08-22 | 2016-11-09 | 兰州工业学院 | The nichrome dusty material containing rare earth and application thereof for abrasive wear resistance |
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| CN112680634B (en) * | 2020-12-11 | 2022-05-17 | 泰尔(安徽)工业科技服务有限公司 | Nickel-based alloy powder material for repairing foot roller of crystallizer and repairing method |
| CN113308662B (en) * | 2021-05-26 | 2023-04-18 | 泰尔(安徽)工业科技服务有限公司 | Spraying repair method for short-edge copper plate side face of continuous casting crystallizer |
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