CN110539101A - Open arc self-protection flux-cored wire for continuous casting roller surfacing of fan-shaped section of continuous casting machine and manufacturing method thereof - Google Patents
Open arc self-protection flux-cored wire for continuous casting roller surfacing of fan-shaped section of continuous casting machine and manufacturing method thereof Download PDFInfo
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- CN110539101A CN110539101A CN201910930233.4A CN201910930233A CN110539101A CN 110539101 A CN110539101 A CN 110539101A CN 201910930233 A CN201910930233 A CN 201910930233A CN 110539101 A CN110539101 A CN 110539101A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3066—Fe as the principal constituent with Ni as next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
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Abstract
An open arc self-protection flux-cored wire for surfacing of a continuous casting roller at a fan-shaped section of a continuous casting machine is disclosed, wherein powder accounts for 39-42% of the total weight of the wire, and the powder comprises the following components in percentage by mass: 4-6.5% of metallic nickel powder, 1-2.6% of ferromolybdenum, 1-1.2% of ferroniobium, 19.5-26% of micro-carbon ferrochromium, 1.2-2.6% of chromium nitride, 0.8-1.5% of 45# ferrosilicon, 1.8-3.1% of electrolytic manganese, 0.12-0.26% of sodium fluoroaluminate, 1.0-2.6% of dolomite, 4-8.5% of rutile, 1.5-3.6% of fluorite, 0.2-0.5% of aluminum powder, 0.2-0.4% of magnesium powder and the balance of iron powder. The basic material is a cold-rolled low-carbon steel strip, and the carbon content is 0.05-0.08%. The invention has the beneficial effects that: the welding process of the self-shielded flux-cored wire has the advantages of excellent performance, attractive forming, less splashing, high-temperature strength, oxidation resistance, corrosion resistance and thermal fatigue resistance, and the metal of the overlaying layer is chromium, nickel and molybdenum low-carbon alloy.
Description
Technical Field
The invention belongs to the technical field of surfacing welding, and particularly relates to an open arc self-protection flux-cored wire for surfacing welding of a sector continuous casting roller and a preparation method thereof.
Background
The continuous casting roll is a main consumable part in continuous casting equipment, and the service life of the continuous casting roll directly determines the cost and the production continuity of a continuous casting process, so that the research on advanced surfacing materials to prolong the service life of the continuous casting roll is of great significance. The continuous casting roll comprises a foot roll, a supporting guide roll, a bending section continuous casting roll, an arc section continuous casting roll, a straightening section continuous casting roll and a horizontal section continuous casting roll. The roller surface temperature of the continuous casting roller of the sector section is higher, the steel billet is not completely solidified and bears the severe bulging force of the steel billet, and meanwhile, the continuous casting roller at the section bears bending deformation and adhesive wear, so the main failure modes of the continuous casting roller are cold and hot fatigue cracks, high-temperature bending deformation and adhesive wear. Aiming at the working environment and failure mode of the continuous casting roller at the section, the traditional manufacturing mode of the submerged arc surfacing sector continuous casting roller is not enough to meet the use requirement, the roller surface is easy to have serious abrasion and fatigue crack in the use process, and the service life is seriously reduced.
Compared with submerged arc welding, open arc surfacing has the main characteristics of less heat input quantity to a workpiece, small workpiece deformation degree, simple welding process, no need of heat treatment before and after welding, energy conservation, high deposition efficiency, strong stability and uniform hardness of a deposition layer, and is particularly suitable for surfacing of small-roller-diameter and hollow roller ways. Therefore, the adoption of the open arc self-protection process for surfacing of the continuous casting roller is a development trend of manufacturing and repairing of the continuous casting roller in the future.
Disclosure of Invention
In view of the problems of the prior segment continuous casting roller surfacing, a surfacing material with wear resistance, cold and hot fatigue resistance and high temperature deformation resistance is selected. The invention aims to provide an open arc self-protection flux-cored wire for overlaying a fan-shaped section continuous casting roller and a preparation method thereof, so as to prolong the service life of the fan-shaped section continuous casting roller.
In order to achieve the purpose, the invention adopts the following technical scheme:
an open arc self-protection flux-cored wire for overlaying of a continuous casting roller at a fan-shaped section of a continuous casting machine comprises powder and a low-carbon steel strip. The welding wire comprises 39-42% of powder, and the powder comprises the following components in percentage by mass: 4-6.5% of metallic nickel powder, 1-2.6% of ferromolybdenum, 1-1.2% of ferroniobium, 19.5-26% of micro-carbon ferrochromium, 1.2-2.6% of chromium nitride, 0.8-1.5% of 45# ferrosilicon, 1.8-3.1% of electrolytic manganese, 0.12-0.26% of sodium fluoroaluminate, 1.0-2.6% of dolomite, 4-8.5% of rutile, 1.5-3.6% of fluorite, 0.2-0.5% of aluminum powder, 0.2-0.4% of magnesium powder and the balance of iron powder. The basic material is a cold-rolled low-carbon steel strip, and the carbon content is 0.05-0.08%.
The nickel powder provides Ni element for the surfacing welding cladding layer, Ni can expand a gamma region, a stable martensite structure of the cladding layer can be ensured even if the content of C is very low, and meanwhile, Ni can improve the tempering resistance of martensite and increase the high-temperature toughness of the martensite. The molybdenum iron contains 55-60% of Mo, and provides Mo element for the surfacing welding cladding layer, and mainly improves the tempering stability and the high-temperature strength. The Nb content of the ferrocolumbium is 62-66%, Nb elements are provided for the surfacing welding cladding layer, the precipitation of niobium carbide is mainly increased, and the high-temperature strength and the wear resistance are improved. The micro-carbon ferrochrome is used for transferring Cr and C to a surfacing welding cladding layer, the carbon content is 0.06-0.08%, the chromium content is 65-68%, the Cr has the function of improving the electrode potential of martensite in steel, and Cr nitride is formed on the surface at high temperature so as to improve the oxidation resistance. Chromium nitride containing 60% Cr and 5.2% N, which mainly provides Cr and N to the cladding layer metal. The Si and Mn elements in the Si-Fe and electrolytic manganese contribute to deoxidation and an excessive amount of Si and Mn is added to the cladding layer. The rest ore powder materials such as sodium fluoroaluminate, dolomite, rutile, fluorite, aluminum powder, magnesium powder and the like mainly play roles in arc stabilization, slagging and gas making.
The diameter of the flux-cored wire is 2.4 mm.
The preparation method of the flux-cored wire comprises the following steps:
1. mixing the medicinal powders according to the mass percentage to obtain mixed medicinal powders, mixing and stirring for 30-50 minutes, and then putting into a furnace for drying, wherein the drying temperature is 300-350 ℃, and the drying time is 3-5 hours.
2.0.3mm 16mm low carbon stainless steel band is washed, dried and rolled into U shape.
3. And filling powder into the U-shaped groove, wherein the powder accounts for 39-42% of the total weight of the welding wire.
And 4, rolling the U-shaped groove into a circular shape, and continuously rolling and drawing to reduce the diameter to finally obtain the welding wire with the diameter of 2.4, namely the open arc self-protection flux-cored wire for the foot roll surfacing of the continuous casting crystallizer.
Compared with the prior art, the invention has the beneficial effects that: the open arc self-protecting flux-cored wire for overlaying welding of the continuous casting roller at the fan-shaped section of the continuous casting machine has the advantages of excellent welding process performance, attractive appearance and less splashing, and the metal of the overlaying welding layer is low-carbon alloy of chromium, nickel and molybdenum, so that the high-temperature strength is high, and the oxidation resistance, the corrosion resistance and the thermal fatigue resistance are excellent.
Detailed Description
The following examples further illustrate embodiments of the present invention.
Example 1: 5kg of metallic nickel powder, 1.5kg of ferromolybdenum, 1.1kg of ferroniobium, 21kg of micro-carbon ferrochromium, 1.8kg of chromium nitride, 1.2kg of 45# ferrosilicon, 2kg of electrolytic manganese, 0.2kg of sodium fluoroaluminate, 1.2kg of dolomite, 4kg of rutile, 1.6kg of fluorite, 0.2kg of aluminum powder, 0.2kg of magnesium powder and 0.5kg of iron powder are fully mixed and stirred for 30 minutes, and then the mixture is put into a furnace to be dried, wherein the powder drying temperature is 320 ℃, and the time is 3 hours. The powder is wrapped by a low-carbon stainless steel with the thickness of 0.3mm multiplied by 16mm, a steel belt is washed, dried and rolled into a U shape, and then the powder is filled into the steel belt, wherein the filling rate is 41.5%. And rolling the U-shaped groove into a circular shape, and then continuously rolling and drawing and reducing to obtain the finished welding wire with the diameter of 2.4.
Example 2: 4.6kg of metallic nickel powder, 1.6kg of ferromolybdenum, 1.2kg of ferrocolumbium, 21kg of micro-carbon ferrochromium, 2kg of chromium nitride, 1.1kg of 45# ferrosilicon, 1.8kg of electrolytic manganese, 0.2kg of sodium fluoroaluminate, 1.2kg of dolomite, 4kg of rutile, 1.8kg of fluorite, 0.5kg of aluminum powder, 0.25kg of magnesium powder and 0.75kg of iron powder are fully mixed and stirred for 30 minutes and then put into a furnace for drying at the powder drying temperature of 320 ℃ for 3 hours. The powder is wrapped by a low-carbon stainless steel with the thickness of 0.3mm multiplied by 16mm, a steel belt is washed, dried and rolled into a U shape, and then the powder is filled into the steel belt, wherein the filling rate is 42%. And rolling the U-shaped groove into a circular shape, and then continuously rolling and drawing and reducing to obtain the finished welding wire with the diameter of 2.4.
example 3: 5kg of metallic nickel powder, 2kg of ferromolybdenum, 1.2kg of ferrocolumbium, 21.5kg of micro-carbon ferrochromium, 1.8kg of chromium nitride, 1kg of 45# ferrosilicon, 1.8kg of electrolytic manganese, 0.2kg of sodium fluoroaluminate, 1.2kg of dolomite, 4.2kg of rutile, 1.5kg of fluorite, 0.2kg of aluminum powder, 0.2kg of magnesium powder and 0.2kg of iron powder are fully mixed and stirred for 30 minutes and then put into a furnace for drying at the drying temperature of 320 ℃ for 3 hours. The powder is wrapped by a low-carbon stainless steel with the thickness of 0.3mm multiplied by 16mm, a steel belt is washed, dried and rolled into a U shape, and then the powder is filled into the steel belt, wherein the filling rate is 42%. And rolling the U-shaped groove into a circular shape, and then continuously rolling and drawing and reducing to obtain the finished welding wire with the diameter of 2.4.
Example 4: 4.8kg of metallic nickel powder, 2kg of ferromolybdenum, 1.2kg of ferrocolumbium, 19.6kg of micro-carbon ferrochromium, 1.6kg of chromium nitride, 1.2kg of 45# ferrosilicon, 1.8kg of electrolytic manganese, 0.2kg of sodium fluoroaluminate, 1.2kg of dolomite, 4.3kg of rutile, 1.5kg of fluorite, 0.4kg of aluminum powder, 0.4kg of magnesium powder and 0.8kg of iron powder are fully mixed and stirred for 30 minutes and then put into a furnace for drying, and the powder drying temperature is 320 ℃ for 3 hours. The powder is wrapped by a low-carbon stainless steel with the thickness of 0.3mm multiplied by 16mm, a steel belt is washed, dried and rolled into a U shape, and then the powder is filled into the steel belt, wherein the filling rate is 41%. And rolling the U-shaped groove into a circular shape, and then continuously rolling and drawing and reducing to obtain the finished welding wire with the diameter of 2.4.
Example 5: 4.5kg of metallic nickel powder, 2kg of ferromolybdenum, 1.2kg of ferroniobium, 21kg of micro-carbon ferrochromium, 1.8kg of chromium nitride, 1.4kg of 45# ferrosilicon, 2kg of electrolytic manganese, 0.2kg of sodium fluoroaluminate, 1.2kg of dolomite, 4kg of rutile, 1.5kg of fluorite, 0.2kg of aluminum powder, 0.2kg of magnesium powder and 0.8kg of iron powder are fully mixed and stirred for 30 minutes, and then the mixture is put into a furnace to be dried, wherein the powder drying temperature is 320 ℃, and the time is 3 hours. The powder is wrapped by a low-carbon stainless steel with the thickness of 0.3mm multiplied by 16mm, a steel belt is washed, dried and rolled into a U shape, and then the powder is filled into the steel belt, wherein the filling rate is 42%. And rolling the U-shaped groove into a circular shape, and then continuously rolling and drawing and reducing to obtain the finished welding wire with the diameter of 2.4.
the flux-cored wires prepared in the above examples were used for build-up welding of continuous casting rolls of continuous casting machine sector segments, respectively, and the welding process properties and the hardness of the build-up welding layer are shown in table 1.
Table 1: performance index of the product of each example
| Example numbering | 1 | 2 | 3 | 4 | 5 |
| Welding process performance | Good effect | Good effect | Good effect | Good effect | Good effect |
| hardness/HRC of the cladding layer | 45.8 | 45.9 | 46.2 | 45.8 | 46.3 |
| Crack(s) | Is free of | is free of | Is free of | Is free of | Is free of |
| Air hole | Is free of | Is free of | Is free of | Is free of | Is free of |
The continuous casting crystallizer foot roll surfacing open arc self-protection flux-cored wire has excellent technological performance and moderate hardness of a cladding layer. Through practical continuous casting process examination, the excessive steel amount and the service life are obviously superior to those of a traditional submerged arc surfacing sector continuous casting roller, and the roller surface of a lower-line roller has no obvious fatigue stripping and severe abrasion.
Claims (3)
1. The open arc self-protection flux-cored wire for surfacing of the continuous casting roller of the fan-shaped section of the continuous casting machine is composed of powder and a low-carbon steel strip, and is characterized in that the powder accounts for 39-42% of the total weight of the wire, and the powder comprises the following components in percentage by mass: 4-6.5% of metallic nickel powder, 1-2.6% of ferromolybdenum, 1-1.2% of ferroniobium, 19.5-26% of micro-carbon ferrochromium, 1.2-2.6% of chromium nitride, 0.8-1.5% of 45# ferrosilicon, 1.8-3.1% of electrolytic manganese, 0.12-0.26% of sodium fluoroaluminate, 1.0-2.6% of dolomite, 4-8.5% of rutile, 1.5-3.6% of fluorite, 0.2-0.5% of aluminum powder, 0.2-0.4% of magnesium powder and the balance of iron powder.
2. The open arc self-shielded flux-cored wire for overlaying of continuous casting rolls of fan-shaped sections of continuous casting machines according to claim 1, wherein the carbon content of the low-carbon steel strip is in the range of 0.05-0.08%.
3. The preparation method of the open arc self-protection flux-cored wire for the continuous casting roller overlaying of the fan-shaped section of the continuous casting machine according to claim 1 or 2, which is characterized by comprising the following steps:
1) mixing the medicinal powders according to the mass percentage to obtain mixed medicinal powders, mixing and stirring for 30-50 minutes, and then putting into a furnace for drying, wherein the drying temperature is 300-350 ℃, and the drying time is 3-5 hours;
2) The low-carbon stainless steel band is washed, dried and rolled into a U shape;
3) Filling powder into the U-shaped groove, wherein the powder accounts for 39-42% of the total weight of the welding wire;
4) And rolling the U-shaped groove into a circular shape, and then continuously rolling and drawing to reduce the diameter to finally obtain the flux-cored wire, namely the open arc self-protection flux-cored wire for the foot roll surfacing of the continuous casting crystallizer.
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Cited By (4)
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| CN112643244A (en) * | 2020-11-30 | 2021-04-13 | 山东聚力焊接材料有限公司 | Self-protection flux-cored wire and preparation method thereof |
| CN114289926A (en) * | 2022-03-07 | 2022-04-08 | 北京奥邦新材料有限公司 | High-niobium flux-cored wire for repairing hard surface of roller press and preparation method thereof |
| CN115476019A (en) * | 2022-09-16 | 2022-12-16 | 苏州优霹耐磨复合材料有限公司 | Continuous casting roller surfacing process |
| CN116713637A (en) * | 2023-07-31 | 2023-09-08 | 燕山大学 | Flux-cored wire for build-up welding and material increase of fan-shaped section continuous casting roller, and preparation method and application thereof |
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| CN112643244B (en) * | 2020-11-30 | 2023-02-14 | 山东聚力焊接材料有限公司 | Self-protection flux-cored wire and preparation method thereof |
| CN114289926A (en) * | 2022-03-07 | 2022-04-08 | 北京奥邦新材料有限公司 | High-niobium flux-cored wire for repairing hard surface of roller press and preparation method thereof |
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| CN115476019B (en) * | 2022-09-16 | 2024-02-02 | 苏州优霹耐磨复合材料有限公司 | Build-up welding process for continuous casting roller |
| CN116713637A (en) * | 2023-07-31 | 2023-09-08 | 燕山大学 | Flux-cored wire for build-up welding and material increase of fan-shaped section continuous casting roller, and preparation method and application thereof |
| CN116713637B (en) * | 2023-07-31 | 2023-11-03 | 燕山大学 | Flux-cored wire for build-up welding and material increase of fan-shaped section continuous casting roller, and preparation method and application thereof |
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