CN113714681B - Flux-cored wire for foot roller of slab crystallizer and manufacturing method thereof - Google Patents

Flux-cored wire for foot roller of slab crystallizer and manufacturing method thereof Download PDF

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CN113714681B
CN113714681B CN202110981099.8A CN202110981099A CN113714681B CN 113714681 B CN113714681 B CN 113714681B CN 202110981099 A CN202110981099 A CN 202110981099A CN 113714681 B CN113714681 B CN 113714681B
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flux
powder
wire
cored wire
slab
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CN113714681A (en
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彭志高
杨宗保
李栋栋
李拓
李道俊
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Liuzhou Chuangke Composite Cermet Products Co ltd
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Liuzhou Chuangke Composite Cermet Products Co ltd
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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
    • B23K35/3033—Ni as the principal 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
    • B23K35/22—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
    • B23K35/3046—Co as the principal 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
    • B23K35/22—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
    • B23K35/308—Fe as the principal constituent with Cr 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
    • 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
    • Y02P10/20—Recycling

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  • Mechanical Engineering (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

The invention provides a flux-cored wire for a foot roller of a slab crystallizer and a manufacturing method thereof, wherein the flux-cored wire comprises a flux coating and a flux core, the flux coating is a steel belt accounting for 60-62% of the total weight of the wire, and the flux core accounts for 38-40% of the total weight of the wire. The drug core comprises the following components in percentage by mass: 11-16% of nickel powder, 4-8% of tungsten powder, 3.0-5.0% of molybdenum powder, 40-45% of chromium powder, 5-7% of cobalt powder, 0.5-0.75% of rare earth ferrosilicon powder, 2.5-3.5% of chromium nitride iron powder, 2.0-3.0% of ice crystal powder and the balance of iron powder and unavoidable impurities. The flux-cored wire for the foot roller of the slab crystallizer has the characteristics of high-temperature tempering resistance, high melting point, high-temperature strength and excellent thermal fatigue resistance.

Description

Flux-cored wire for foot roller of slab crystallizer and manufacturing method thereof
Technical Field
The invention relates to the technical field of welding materials, in particular to a flux-cored wire for a foot roller of a slab crystallizer and a manufacturing method thereof.
Background
The slab continuous casting technology is a process of forming molten steel qualified in smelting into a slab. The slab continuous casting production line is technological equipment for implementing the process. In terms of the technology of slab production, a slab crystallizer receives molten steel, the molten steel in contact with the inner wall of the crystallizer is solidified into a thin shell, the molten steel with a core part loaded on the thin shell is slowly pulled out from an outlet at the lower edge of the crystallizer under the vibration and gravity action of the crystallizer, then an object with an outer layer of the thin shell and a core part of high-temperature molten steel is supported and protected by a wide foot roller and a narrow foot roller at the lower edge of the crystallizer, and passes through the wide foot roller and the narrow foot roller at a speed of 1.5-1.7 m/min; inner arc and outer arc continuous casting rolls of the bending section; the inner arc and the outer arc continuous casting rolls of the arc section, the supporting and the extrusion of the upper continuous casting roll and the lower continuous casting roll of the horizontal section complete the crystallization and solidification process of the slab section, and the slab is formed. Such a slab line, which is entirely composed of rolls, is tens of meters long, the working conditions of the rolls in different areas being very different. The temperature of the foot roller at the outlet of the crystallizer contacting the red steel is about 1400 ℃, and the foot roller is sprayed by cooling water; while the horizontal continuous casting rolls contact the red steel at a temperature of about 900 c and also receive the cooling water spray. The traditional manufacturing technology is to build up welding by adopting 414 flux-cored wires for the design of all the roller surface working layers. The cladding metal components of the 414 flux-cored wire are shown in the following table one, and the surfacing foot roller working layer is corroded and cracked to fail on the working surface with the steel passing amount of 4-6 ten thousand tons (1.5-2.5 ten thousand tons).
The chemical composition of main alloy element of the flux-cored wire cladding metal in the prior art 414 is shown in the table 1
Composition of the components ≤C ≥Mn ≥Cr ≥Ni ≥Mo
Data 0.12 1.1 13.5 3.5 1
In order to improve the service life of the foot roller of the crystallizer, new requirements are put forward on the surfacing material of the working layer of the foot roller.
Disclosure of Invention
The invention aims to solve the technical problems existing in the traditional process technology. Therefore, the invention provides a flux-cored wire for a foot roller of a slab crystallizer and a manufacturing method thereof, and aims to solve the problem that a flux-cored wire of the traditional process technology has a low service life of a working layer in the foot roller application of the slab crystallizer.
Based on the above purpose, the invention provides a flux-cored wire for a slab crystallizer foot roller, which comprises a coating and a flux core, wherein the coating is a steel belt accounting for 60-62% of the total weight of the wire, and the flux core accounts for 38-40% of the total weight of the wire. The drug core comprises the following components in percentage by mass: 11-16% of nickel powder, 4-8% of tungsten powder, 3.0-5.0% of molybdenum powder, 40-45% of chromium powder, 5-7% of cobalt powder, 0.5-0.75% of rare earth ferrosilicon powder, 2.5-3.5% of chromium nitride iron powder, 2.0-3.0% of ice crystal powder and the balance of iron powder and unavoidable impurities.
Preferably, the coating is a 08Al low-carbon steel strip with the thickness of 0.5mm and the width of 15 mm.
Preferably, the granularity of the nickel powder is 60-120 meshes, the granularity of the tungsten powder is 100-120 meshes, the granularity of the molybdenum powder is 100-120 meshes, the granularity of the chromium powder is 80-100 meshes, the granularity of the cobalt powder is 150-200 meshes, the granularity of the rare earth ferrosilicon powder is 80-100 meshes of yttrium-based rare earth ferrosilicon powder, the granularity of the ferrochromium nitride is 80-100 meshes, and the granularity of the ice crystal powder is 150-200 meshes of K 3 AlF 6 The granularity of the iron powder is 80-100 meshes.
The invention also provides a manufacturing method of the flux-cored wire for the foot roller of the slab crystallizer, which comprises the following steps:
firstly, weighing the components of the medicine core according to the formula amount, and sequentially mixing, baking and distributing to form the medicine core;
and secondly, conveying the steel belt to a rolling groove, and then sequentially feeding medicines and wrapping edges of the steel belt by a die, and forming by a silk making machine.
In the first step, the mixed materials are mixed for 8 hours by a powder mixer, and the baking is to put the mixed materials after the mixed materials into a box-type resistance furnace and bake for 8 hours at 150-250 ℃.
And in the second step, a wire making machine driven by drawing and winding wires is adopted, and the flux-cored wire is drawn and reduced in diameter twice after being molded.
The flux-cored wire adopts a submerged arc surfacing welding process, a power supply is in direct-current frequency conversion, forward and reverse connection, welding voltage is 32-36V, current is 300-360A, welding speed is 550-650mm/min, and welding flux is 170 sintered welding flux sold in the market.
The cladding metal of the flux-cored wire comprises the following chemical components in percentage by mass: c:0.04-0.06%; n:0.06-0.1%; ni:4-6%; cr:14-16%; mo:1 to 1.8 percent; w:1.5-3%; co:1.9-2.7%; mn:0.3-0.45%; si:0.2-0.3%; re:0.02-0.05%, and the balance of iron powder and unavoidable impurity elements.
The flux-cored wire is also suitable for the inner arc and the outer arc continuous casting rollers of the bending section adjacent to the foot roller of the slab continuous casting production line.
In the invention, the oxidation resistant elements Ni and Cr are preferably used as the flux-cored components of the flux-cored wire, so that the cladding metal of the flux-cored wire has high-temperature oxidation resistance and thermal fatigue resistance. The flux-cored components of the welding wire are preferably W, mo and Co, so that the cladding metal of the welding wire has high melting point, high-temperature strength, high-temperature tempering resistance and high thermal fatigue resistance. The preferred rare earth is the flux-cored component which is added in a rare earth silicon mode and is used as a welding wire, the rare earth is a surface active element, and the rare earth has the functions of removing harmful elements P and S, modifying (namely changing the shape and the distribution of a clamp) and refining grains. The preferable N is in the form of ferrochromium nitride which is added into the flux-cored component of the welding wire, the atomic radius of nitrogen is similar to that of carbon, and partial substitution of C element ensures that the cladding metal has high strength, hardness and no loss of toughness. Preferred ice crystal powder (K 3 AlF 6 ) The flux core component of the welding wire is used for purifying a welding pool and slagging, and the potassium is used as a surface active element to participate in the metallurgical reaction of the welding pool, so that the flux core component has the effects of refining grains and removing harmful elements. The preferable atomized iron powder is used as the component of the flux core of the welding wire.
The invention has the beneficial effects that:
1. the flux-cored wire for the foot roller of the slab crystallizer has proper hardness and toughness, and has the characteristics of high melting point, high-temperature strength, high-temperature tempering resistance and excellent thermal fatigue resistance.
2. The invention adopts the low-carbon steel strip (08 Al) as the coating material of the flux-cored wire, has good formability for manufacturing the flux-cored wire, and has low carbon C, sulfur S and phosphorus P.
3. The invention optimizes the design of each component of the flux-cored wire so as to achieve the better compatibility that the components meet the working condition of the foot roller of the crystallizer.
4. The invention discloses a flux-cored wire for a foot roller of a slab continuous casting crystallizer, which is used for a plurality of years in service of a certain iron and steel company, and the steel passing amount of the foot roller is 23-28 ten thousand tons.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present invention, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a physical picture of a narrow-side foot roller of a crystallizer with a steel passing amount of 2.1 ten thousand tons failing to be taken off in a certain steel plant;
FIG. 2 is a process flow diagram of the manufacture of a foot roll flux-cored wire for a slab continuous casting mold of the present invention;
FIG. 3 is a photograph of a wide-side foot roller of a crystallizer after 27 ten thousand tons of steel are passed off line in a certain steelworks using the flux-cored wire of the present invention.
Detailed Description
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present invention should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present disclosure pertains.
Aiming at the problems of poor high-temperature tempering resistance (reduced hardness at high temperature), low melting point, low high-temperature strength and poor thermal fatigue resistance of the flux-cored wire in the application of a working layer of a foot roller of a crystallizer in the prior art, the invention optimizes the design of each component of the flux-cored wire so as to achieve the compatibility that all the components meet the working condition of the foot roller of the crystallizer. The first problems considered in the formulation of the elements are: the removal of harmful elements is equally important as the addition of beneficial elements. The influence of harmful elements such as sulfur (S) and phosphorus (P) on the melting point of the metal clad on the welding wire and the thermal fatigue resistance is remarkable. The raw materials are preferably removed, the (S) and phosphorus (P) carrying amounts are strictly controlled, unavoidable carrying amounts are removed, and irremovable residual amounts are modified (i.e. modification technique is applied). Optimally adding a certain amount of effective elements such as tungsten (W), molybdenum (Mo) and cobalt (Co) for improving the melting point, the thermal strength and the high-temperature tempering resistance and the thermal fatigue resistance of the cladding metal; optimally adding a certain amount of antioxidation elements nickel (Ni) and chromium (Cr); the method has the advantages that the elemental carbon (C) and the elemental silicon (Si) with great influence on the improvement of the hardness and the reduction of the toughness of the cladding metal are reasonably controlled. Certain nitrogen (N) element is added to compensate the reduction of carbon (C) to affect the strength and the hardness, and the toughness loss is small.
The invention provides a flux-cored wire for a slab crystallizer foot roller, which comprises a coating and a flux core, wherein the coating is a steel belt accounting for 60-62% of the total amount of the wire, the flux core accounts for 38-40% of the total amount of the wire, and the flux core comprises the following components in percentage by mass: 11-16% of nickel powder, 4-8% of tungsten powder, 3-5.0% of molybdenum powder, 40-45% of chromium powder, 5-7% of cobalt powder, 0.5-0.75% of rare earth ferrosilicon powder, 2.5-3.5% of chromium nitride iron powder, 2.0-3.0% of ice crystal powder and the balance of iron powder and unavoidable impurities.
In the invention, a low-carbon steel strip (08 Al) is preferable as a coating material of the flux-cored wire, and has the advantages of good formability for manufacturing the flux-cored wire and low carbon (C), sulfur (S) and phosphorus (P). As an alternative embodiment. Preferably, the coating is a 08Al low-carbon steel strip with the thickness of 0.5mm and the width of 15mm, and accounts for 60-62% of the total amount of the welding wire.
In order to limit substitution of harmful elements, pure metal powder (atomization method, electrolysis method) which is purer than other ferroalloys and less in harmful elements is preferable as far as possible as a component of the core.
In the formula, the preferential antioxidation elements, namely nickel (Ni) and chromium (Cr) are used as the flux-cored components of the flux-cored wire, so that the cladding metal of the flux-cored wire has high-temperature oxidation resistance and thermal fatigue resistance. The preferable flux-cored components of the welding wire are tungsten (W), molybdenum (Mo) and cobalt (Co) which enable the cladding metal of the welding wire to have high melting point, high-temperature strength, high-temperature tempering resistance and high thermal fatigue resistance. The preferred rare earth (Re) is the flux-cored component of the welding wire in a rare earth ferrosilicon mode, and the rare earth (Re) is a surface active element, and has the functions of removing harmful elements P and S, modifying (namely changing the shape and the distribution of a sandwich) and refining grains. The preferred nitrogen (N) is added as a flux-cored component of the welding wire in the form of ferrochromium nitride, the atomic radius of the nitrogen is similar to that of carbon, and partial substitution of carbon (C) element leads to high strength and less loss of toughness of the cladding metal. Preferred ice crystal powder (K 3 AlF 6 ) The flux core component of the welding wire is used for purifying a welding pool and slagging, and the potassium is used as a surface active element to participate in the metallurgical reaction of the welding pool, so that the flux core component has the effects of refining grains and removing harmful elements. The preferable atomized iron powder is used as the component of the flux core of the welding wire.
In the present invention, the weight proportions of the flux-cored components of the preferred welding wire and the corresponding particle sizes are shown in Table two below.
The proportion of the components of the medicine core and the technological index are shown in Table II
Figure GDA0003889432490000071
In the invention, the flux-cored wire flux-cored treatment process flow is as follows: firstly, accurately weighing the ratio of the components of the flux core specified by the second scale by using an electronic scale, then adopting a powder stirrer to mix for 8 hours, then loading a tray (the thickness is 30-50 mm) into a box-type resistance furnace, baking for 8 hours at 150-250 ℃, then loading into a distributing hopper of a welding wire machine, and obtaining the flux core after material distribution and molding. The operation of the flux core material moving from the unloading of the device to the material distribution forming process after the flux core is mixed and stirred does not allow the operation of the flux core material moving relatively, so that the segregation of each component of the flux core material caused by the relative movement is avoided.
The manufacturing method of the flux-cored wire comprises the following steps: conveying steel belts, rolling grooves, feeding medicines, die edge covering, and forming by a wire drawing and winding driving type wire making machine. The flux-cored wire is drawn for reducing the diameter twice after being molded, so that the internal powder is compact, the surface of the wire is smooth and round, and the size is accurate, thereby being beneficial to the welding process.
The special flux-cored wire for the slab continuous casting roller adopts a submerged arc surfacing welding process, preferably 107 sintering welding flux, has a power supply of direct current frequency conversion, forward and reverse connection, welding voltage of 32-36V, current of 300-360A and welding speed of 550-650mm/min. The cladding metal of the flux-cored wire comprises the following chemical components in percentage by mass: c:0.04-0.06%; n:0.06-0.1%; ni:4-6%; cr:14-16%; mo:1-2%; w:1.5-3%; mn:0.3-0.6%; co:1.9-2.7%; si:0.2-0.3%; re:0.02-0.03%.
The following is a description of specific preferred examples.
Example 1
The flux-cored wire for the foot roller of the slab crystallizer comprises a coating and a flux core, wherein the coating is a steel belt accounting for 62% of the total amount of the wire, the flux core accounts for 38% of the total amount of the wire, and the flux core comprises the following components in percentage by mass: 12% of nickel powder, 6.0% of tungsten powder, 3.5% of molybdenum powder, 41.5% of chromium powder, 5.5% of cobalt powder, 0.6% of rare earth ferrosilicon powder, 3.0% of ferrochromium nitride, 2.5% of ice crystal powder and the balance of iron powder and unavoidable impurities. The purity of each component is shown in Table I.
The flux-cored wire flux-cored treatment process flow is as follows: the components of the flux core are accurately weighed according to the formula amount by an electronic scale, then the flux core is mixed for 8 hours by a powder mixer, then the flux core is baked for 8 hours at 200 ℃ by a box-type resistance furnace after being filled with a disc (with the thickness of 40 mm), and then the flux core is obtained after the flux core is formed by material distribution. The operation of the flux core material is not allowed to have relative movement from the unloading to the material distribution forming process after the flux core is mixed, so that segregation of each component of the flux core material caused by the relative movement is avoided.
The manufacturing method of the flux-cored wire comprises the following steps: conveying steel belts, rolling grooves, feeding medicines, die edge covering, and forming by a wire drawing and winding driving type wire making machine. The flux-cored wire is drawn for reducing the diameter twice after being molded.
The special flux-cored wire for the foot roller of the slab crystallizer, which is manufactured in the embodiment 1, adopts a submerged arc surfacing welding process, selects 107 sintered flux, adopts direct current frequency conversion as a power supply, and adopts forward and reverse connection, the welding voltage is 35V, the current is 350A, and the welding speed is 600mm/min. The cladding metal of the welding wire comprises the following chemical components in percentage by mass: c:0.05%; n:0.08%; ni:4.2%; cr:15.1%; mo:1.26%; w:1.05%; mn:0.35%; co:2.1%; si:0.25%; re:0.025% of iron and the balance of unavoidable other impurity elements.
Comparative example 1
The flux-cored wire for the foot roller of the slab crystallizer comprises a coating and a flux core, wherein the coating is a steel belt accounting for 60% of the total amount of the wire, the flux core accounts for 40% of the total amount of the wire, and the flux core comprises the following components in percentage by mass: 10% of nickel powder, 3.5% of tungsten powder, 2.5% of molybdenum powder, 32.0% of chromium powder, 4.0% of cobalt powder, 0.4% of rare earth ferrosilicon powder, 2.0% of ferrochromium nitride, 2.5% of ice crystal powder and the balance of iron and unavoidable impurities. The purity of each component is shown in Table I. The process flow of the flux-cored wire was as described in example 1.
The welding process of the flux-cored wire manufactured in comparative example 1 is the same as in example 1, except that the cladding metal is: c:0.05%; n:0.05%; ni:3.75%; cr:12.3%; mo:0.95%; w:1.32%; mn:0.35%; co:1.51%; si:0.23%; re:0.018%, the balance being iron and unavoidable impurities.
The foot roller manufactured by the flux-cored wire of the example 1 is put into service for many years in a certain iron and steel company, and the steel passing amount of the foot roller is 23-28 ten thousand tons. Fig. 3 is a photograph of a wide-side foot roll of a crystallizer after a certain steel mill using the flux-cored wire of example 1 has passed 27 ten thousand tons of steel.
Practice shows that the invention can effectively prolong the service life of the working face of the foot roller of the crystallizer. The flux-cored wire prepared in comparative example 1 was used for the working surface of the foot roller of the crystallizer, and the service life was lower than that in example 1.
Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the disclosure, including the claims, is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.
The embodiments of the invention are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the present invention should be included in the scope of the present invention.

Claims (8)

1. The flux-cored wire for the foot roller of the slab crystallizer comprises a coating and a flux core, and is characterized in that the coating is a steel belt accounting for 60-62% of the total weight of the wire, the flux core accounts for 38-40% of the total weight of the wire, and the flux core comprises the following components in percentage by mass: 11-16% of nickel powder, 4-8% of tungsten powder, 3.0-5.0% of molybdenum powder, 40-45% of chromium powder, 5-7% of cobalt powder, 0.5-0.75% of rare earth ferrosilicon powder, 2.5-3.5% of chromium nitride iron powder, 2.0-3.0% of ice crystal powder and the balance of iron powder and unavoidable impurities.
2. The flux-cored wire for foot rolls of slab crystallizers according to claim 1, wherein the coating is a 08Al mild steel strip having a thickness of 0.5mm and a width of 15 mm.
3. The flux-cored wire for foot rollers of slab crystallizers according to claim 1, wherein the nickel powder has a particle size of 60 to 120 mesh, the tungsten powder has a particle size of 100 to 120 mesh, the molybdenum powder has a particle size of 100 to 120 mesh, the chromium powder has a particle size of 80 to 100 mesh, the cobalt powder has a particle size of 150 to 200 mesh, the rare earth ferrosilicon powder has a particle size of 80 to 100 mesh, the yttrium-based rare earth ferrosilicon powder has a particle size of 80 to 100 mesh, the chromium nitride has a particle size of 150 to 200 mesh, and the ice crystal powder has a particle size of K 3 AlF 6 The granularity of the iron powder is 80-100 meshes.
4. A method of manufacturing a flux-cored wire for a foot roll of a slab crystallizer as recited in any one of claims 1 to 3, comprising the steps of:
firstly, weighing the components of the medicine core according to the formula amount, and sequentially mixing, baking and distributing to form the medicine core;
step two, conveying the steel belt to a rolling groove, and then sequentially feeding medicines and wrapping by a die, and reducing and wiredrawing to form.
5. The method for manufacturing flux-cored wires for foot rollers of slab crystallizers according to claim 4, wherein the step one is mixing the materials with a powder mixer for 8 hours, and the baking is to put the mixed materials into a box-type resistance furnace and bake the materials for 8 hours at 150-250 ℃.
6. The method of manufacturing flux-cored wires for foot rolls of slab crystallizers according to claim 4, wherein in the second step, a wire making machine driven by a drawing wire coil is adopted, and the flux-cored wires are reduced in diameter by two drawing processes after being molded.
7. The method for manufacturing the flux-cored wire for the foot roller of the slab crystallizer, which is disclosed in claim 4, is characterized in that the flux-cored wire adopts a submerged arc surfacing welding process, the power supply is in direct current frequency conversion, forward and reverse connection, the welding voltage is 32-36V, the current is 300-360A, and the welding speed is 550-650mm/min.
8. The welding method for manufacturing the flux-cored wire for the foot roller of the slab crystallizer according to claim 7, wherein the cladding metal of the flux-cored wire comprises the following chemical components in percentage by mass: c:0.04-0.06%; n:0.06-0.1%; ni:4-6%; cr:14-16%; mo:1 to 1.8 percent; w:1.5-3%; co:1.9-2.7%; mn:0.3-0.45%; si:0.2-0.3%; re:0.02-0.05%, and the balance of iron and unavoidable impurity elements.
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DE2238688A1 (en) * 1972-08-05 1974-02-21 British Oxygen Co Ltd Consumable welding filler - with tubular ductile cover and at least partly sintered packing
CN1170651A (en) * 1996-07-15 1998-01-21 潘国嶍 High hardness wear resisting welding wire with flux core
CN1281767A (en) * 2000-09-08 2001-01-31 北京工业大学 Aged hardened toolsteel tungsten argon arc welding metal powder core surfacing welding rod
CN105431256A (en) * 2013-07-31 2016-03-23 L.E.君斯公司 Iron-based alloys and methods of making and use thereof
CN106555112A (en) * 2016-11-08 2017-04-05 潜山县凯创橡塑机械制造有限公司 A kind of wear and shock-resistant alloy bushing and preparation method thereof
CN109604858A (en) * 2018-11-23 2019-04-12 北京奥邦新材料有限公司 For repairing the flux-cored wire and its melting and coating process of the hollow sufficient roll sleeve of continuous casting
CN110480205A (en) * 2019-09-29 2019-11-22 鞍钢集团北京研究院有限公司 Continuous casting machine crystallizer foot roll built-up welding open arc self-protection flux-cored wire and its preparation method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2238688A1 (en) * 1972-08-05 1974-02-21 British Oxygen Co Ltd Consumable welding filler - with tubular ductile cover and at least partly sintered packing
CN1170651A (en) * 1996-07-15 1998-01-21 潘国嶍 High hardness wear resisting welding wire with flux core
CN1281767A (en) * 2000-09-08 2001-01-31 北京工业大学 Aged hardened toolsteel tungsten argon arc welding metal powder core surfacing welding rod
CN105431256A (en) * 2013-07-31 2016-03-23 L.E.君斯公司 Iron-based alloys and methods of making and use thereof
CN106555112A (en) * 2016-11-08 2017-04-05 潜山县凯创橡塑机械制造有限公司 A kind of wear and shock-resistant alloy bushing and preparation method thereof
CN109604858A (en) * 2018-11-23 2019-04-12 北京奥邦新材料有限公司 For repairing the flux-cored wire and its melting and coating process of the hollow sufficient roll sleeve of continuous casting
CN110480205A (en) * 2019-09-29 2019-11-22 鞍钢集团北京研究院有限公司 Continuous casting machine crystallizer foot roll built-up welding open arc self-protection flux-cored wire and its preparation method

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