CN113714681A - 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 PDFInfo
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- CN113714681A CN113714681A CN202110981099.8A CN202110981099A CN113714681A CN 113714681 A CN113714681 A CN 113714681A CN 202110981099 A CN202110981099 A CN 202110981099A CN 113714681 A CN113714681 A CN 113714681A
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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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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 strip accounting for 60-62% of the total amount of the wire, and the flux core accounts for 38-40% of the total amount of the wire. The medicine 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 inevitable impurities. The flux-cored wire for the foot roller of the slab crystallizer, which is manufactured by the invention, has the characteristics of high temperature tempering resistance, high melting point, high temperature strength and excellent thermal fatigue resistance.
Description
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 by smelting into a slab. The slab continuous casting line is the technological equipment for implementing the process. According to 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 thin shell holds the molten steel of a core part and is slowly drawn out from an outlet of the lower edge of the crystallizer under the action of vibration and gravity of the crystallizer, and then an object with a thin shell as an outer layer and high-temperature molten steel as the core part is supported and protected by a wide-edge foot roller and a narrow-edge foot roller at the lower edge of the crystallizer and passes through the wide-edge foot roller and the narrow-edge foot roller at the speed of 1.5-1.7 m/min; continuous casting rolls for inner arcs and outer arcs of the bending sections; the supporting and the extrusion of the inner arc continuous casting roll and the outer arc continuous casting roll in the arc section and the upper and the lower continuous casting rolls in the horizontal section complete the process of crystallization and solidification of the section of the plate blank, and the plate blank is formed. In the slab production line which is dozens of meters long and consists of rollers, the working conditions of the rollers in different areas are greatly different. The temperature of the foot roller at the outlet of the crystallizer contacting the red steel is about 1400 ℃, and the foot roller bears the spray of cooling water; and the temperature of the continuous casting roller of the horizontal section contacting the red steel is about 900 ℃, and the continuous casting roller also bears the spray of cooling water. In the traditional manufacturing technology, the working layers on the surfaces of all the rollers are designed and formed by 414 flux-cored wire surfacing. The components of the cladding metal of the 414 flux-cored wire are shown in the following table I, and the surfacing foot roller working layer generates corrosion and cracking on a working surface with the steel passing amount of 4-6 ten thousand tons (also 1.5-2.5 ten thousand tons) to fail.
Main alloy element chemical composition table I of 414 flux-cored wire cladding metal in traditional technology
| Composition (I) | ≤C | ≥Mn | ≥Cr | ≥Ni | ≥Mo |
| Data of | 0.12 | 1.1 | 13.5 | 3.5 | 1 |
In order to prolong the service life of the foot roller of the crystallizer, new requirements are put forward on a surfacing material of a working layer of the foot roller.
Disclosure of Invention
The invention aims to solve the technical problems in the traditional process technology. Therefore, the invention provides a flux-cored wire for a foot roll of a slab crystallizer and a manufacturing method thereof, and aims to solve the problem that the service life of a working layer of the flux-cored wire in the application of the foot roll of the slab crystallizer in the traditional process technology is short.
Based on the aim, the invention provides a flux-cored wire for a foot roller of a slab crystallizer, which comprises a flux coating and a flux core, wherein the flux coating is a steel strip accounting for 60-62% of the total amount of the wire, and the flux core accounts for 38-40% of the total amount of the wire. The medicine 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 inevitable 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 particle size of the nickel powder is 60-120 meshes, the particle size of the tungsten powder is 100-120 meshes, the particle size of the molybdenum powder is 100-120 meshes, and the particle size of the chromium powder is 100-120 meshes80-100 meshes, the granularity of the cobalt powder is 150-200 meshes, the rare earth ferrosilicon powder is 80-100 meshes of yttrium-based rare earth ferrosilicon powder, the granularity of the chromium iron nitride is 80-100 meshes, and the granularity of the ice crystal powder is 150-200 meshes of K3AlF6The granularity of the iron powder is 80-100 meshes.
The invention also provides a manufacturing method of the flux-cored wire for the foot roll of the slab crystallizer, which comprises the following steps:
firstly, weighing the components of the medicine core according to the formula, and sequentially mixing, baking and distributing to form the medicine core;
and step two, conveying the steel strip to a rolling groove, then sequentially feeding the medicine, wrapping the edges by using a die, and forming by using a silk making machine.
And in the step one, the mixture is mixed and stirred for 8 hours by using a powder stirrer, and the baking is to bake the mixed mixture for 8 hours at the temperature of 150-.
And in the second step, a drawing and wire winding driving type wire making machine is adopted, and the flux-cored wire is formed and then is subjected to drawing and reducing for two times.
The flux-cored wire adopts a submerged arc surfacing welding process, the power supply adopts direct current frequency conversion, the positive direction is reversely connected, the welding voltage is 32-36V, the current is 300-360A, the welding speed is 550-650mm/min, and the flux is a commercially available 170 sintered flux.
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 to 6 percent; cr: 14 to 16 percent; mo: 1 to 1.8 percent; w: 1.5 to 3 percent; co:1.9 to 2.7 percent; mn: 0.3-0.45%; si: 0.2 to 0.3 percent; re: 0.02-0.05%, and the balance of iron powder and inevitable impurity elements.
The flux-cored wire is also suitable for the inner arc and outer arc continuous casting rollers of the bending section close to the foot roller of the slab continuous casting production line.
In the invention, the oxidation-resistant elements Ni and Cr are preferably selected 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 W, Mo and Co are used as the flux-cored components of the welding wire, 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 preferable rare earth is added as the flux-cored component of the welding wire in the mode of rare earth siliconIs a surface active element, and has the functions of removing harmful elements of phosphorus P and sulfur S, modifying (changing the form and distribution of an inclusion substance) and refining grains. The preferable N is in the form of chromium iron nitride which is matched with the flux core component of the welding wire, the atomic radius of the nitrogen is similar to that of carbon, and partial C element is substituted to ensure that the cladding metal has high strength and hardness without losing toughness. Preferred cryolite (K)3AlF6) The flux-cored wire is used as a component for purifying a welding molten pool and slagging, and potassium is a surface active element to participate in metallurgical reaction of the welding molten pool, so that the flux-cored wire has the effects of refining grains and removing harmful elements. The optimized atomized iron powder as the component of the flux core of the welding wire is required by the proportion.
The invention has the beneficial effects that:
1. the flux-cored wire for the foot roller of the slab crystallizer, which is manufactured by the invention, 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 (08Al) 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 better compatibility of the elements meeting the working conditions of foot rollers of the crystallizer.
4. The flux-cored wire for the foot roller of the slab continuous casting crystallizer, which is manufactured by the invention, is in service for years in a certain 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 embodiments of the present invention or the technical solutions in the conventional technologies, the drawings used in the description of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a picture of a crystallizer narrow-side foot roller object which is failed off line by 2.1 ten thousand tons of steel passing amount in a certain steel mill;
FIG. 2 is a process flow diagram for manufacturing a foot roll flux-cored wire of a slab continuous casting crystallizer according to the present invention;
FIG. 3 is a picture of a wide-side foot roller of a crystallizer after a steel amount of 27 ten thousand tons is discharged from a steel mill by using the flux-cored wire of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to specific embodiments and the accompanying drawings.
It is to be noted that technical terms or scientific terms used in the embodiments of the present invention should have the ordinary meanings as understood by those having ordinary skill in the art to which the present disclosure belongs, unless otherwise defined.
Aiming at the problems that the flux-cored wire in the prior art has poor high-temperature tempering resistance (the hardness is reduced at high temperature), low melting point, low high-temperature strength and poor thermal fatigue resistance in the application of a foot roller working layer of a crystallizer, the invention optimizes the design of each component of the flux-cored wire so as to achieve the aim that the elements meet the better compatibility of the working conditions of the foot roller of the crystallizer. The first consideration in the compatibility of the elements is: the removal of harmful elements is equally important as the addition of beneficial elements. For example, harmful elements such as sulfur (S) and phosphorus (P) have obvious influence on the melting point and the thermal fatigue resistance of the welding wire cladding metal. For this purpose, the raw materials are preferably chosen, the (S) and phosphorus (P) contents are strictly controlled, the inevitable contents are removed, and the irremovable residues are modified (i.e., metamorphic techniques are used). Optimally adding a certain amount of effective elements for improving the melting point, the thermal strength, the high-temperature tempering resistance and the thermal fatigue resistance of the cladding metal, such as tungsten (W), molybdenum (Mo) and cobalt (Co); optimally adding a certain amount of antioxidant elements of nickel (Ni) and chromium (Cr); the reasonable control of the elements of carbon (C) and silicon (Si) has great influence on the improvement of the hardness and the reduction of the toughness of the cladding metal. Adding certain nitrogen (N) element to compensate the reduction of carbon (C) to affect the strength and the hardness, and the loss of toughness is less.
Therefore, the invention provides a flux-cored wire for foot rollers of slab crystallizers, which comprises a flux coating and a flux core, wherein the flux coating is a steel strip 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 inevitable impurities.
In the invention, the low-carbon steel strip (08Al) is preferably used as a coating material of the flux-cored wire, and has the advantages of good formability for manufacturing the 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.
To limit the substitution of harmful elements, pure metal powders (atomization, electrolysis) are preferred as far as possible as the components of the flux core, the pure metal powders being purer and less harmful elements than other iron alloys.
In the formula of the invention, the preferable antioxidant elements, 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 tungsten (W), molybdenum (Mo) and cobalt (Co) are used as the flux-cored components of the welding wire, 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 preferable rare earth (Re) is added in a mode of rare earth ferrosilicon as a flux core component of the welding wire, and the rare earth (Re) is a surface active element and has the functions of removing harmful elements of phosphorus P and sulfur S, modifying (namely changing the form and distribution of an inclusion) and refining grains. The preferable nitrogen (N) is prepared into the flux core component of the welding wire in a mode of nitriding ferrochrome, the atomic radius of the nitrogen is similar to that of carbon, and partial substituted carbon (C) elements enable the cladding metal to have high strength and less toughness loss. Preferred cryolite (K)3AlF6) The flux-cored wire is used as a component for purifying a welding molten pool and slagging, and potassium is a surface active element to participate in metallurgical reaction of the welding molten pool, so that the flux-cored wire has the effects of refining grains and removing harmful elements. The optimized atomized iron powder as the component of the flux core of the welding wire is required by the proportion.
In the present invention, the preferred weight ratios of the flux core components and the corresponding particle sizes of the welding wire are shown in the following table two.
Medicine core component proportion and process technical index table two
In the invention, the flux-cored treatment process flow of the flux-cored wire is as follows: the method comprises the steps of accurately weighing the component proportion of the flux core specified by the second scale by using an electronic scale, mixing and stirring for 8 hours by using a powder stirrer, baking for 8 hours at the temperature of 250 ℃ in a nearly box-type resistance furnace in a loading tray (the thickness is 30-50mm), loading into a material distributor hopper of a welding wire machine, and distributing and forming to obtain the flux core. The operation of the process of moving the medicine core is not allowed to make the medicine core material have relative motion so as to avoid the segregation of all components of the medicine core material caused by the relative motion.
The manufacturing method and the process of the flux-cored wire are as follows: conveying steel belt → rolling groove → feeding medicine → die wrapping → drawing and coiling wire driving type wire making machine for forming. The flux-cored wire is formed and then is subjected to drawing and reducing twice, so that the powder inside the flux-cored wire is compact, the surface of the flux-cored wire is smooth and round, and the size is accurate, thereby being beneficial to a welding process.
In the invention, the manufactured flux-cored wire special for the slab continuous casting roller adopts a submerged arc surfacing welding process, preferably 107 sintered flux, a power supply adopts direct current frequency conversion, positive reverse connection, welding voltage of 32-36V, current of 300-. 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 to 6 percent; cr: 14 to 16 percent; mo: 1 to 2 percent; w: 1.5 to 3 percent; mn: 0.3 to 0.6 percent; 1.9 to 2.7 percent of Co; si: 0.2 to 0.3 percent; re: 0.02-0.03%.
The following is a description by way of specific preferred examples.
Example 1
A flux-cored wire for a foot roller of a slab crystallizer comprises a flux coating and a flux core, wherein the flux coating is a steel strip 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, 3.0% 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 inevitable impurities. The purity of each component is shown in table one.
The flux-cored treatment process flow of the flux-cored wire is as follows: the method comprises the following steps of accurately weighing the components of the flux core according to the formula amount by using an electronic scale, then mixing and stirring for 8 hours by using a powder stirrer, then loading into a tray (with the thickness of 40mm), baking for 8 hours at 200 ℃ in a box-type resistance furnace, then loading into a material distributor hopper of a welding wire machine, and carrying out material distribution forming to obtain the flux core. The operation of the process of moving the medicine core from the discharging to the cloth forming process after the medicine core is mixed and stirred does not allow the operation of relative movement of the medicine core materials, so as to avoid the segregation of the components of the medicine core materials caused by the relative movement.
The manufacturing method and the process of the flux-cored wire are as follows: conveying steel belt → rolling groove → feeding medicine → die wrapping → drawing and coiling wire driving type wire making machine for forming. The flux-cored wire is drawn and reduced in diameter for two times after being formed.
The flux-cored wire special for the foot roll of the slab crystallizer manufactured in the embodiment 1 adopts a submerged arc surfacing welding process, 107 sintered fluxes are selected, a power supply adopts direct current frequency conversion, the forward direction is reversely connected, the welding voltage is 35V, the current is 350A, and the welding speed is 600 mm/min. The cladding metal of the welding wire comprises the following chemical components in percentage by mass: c: 0.05 percent; n: 0.08 percent; ni: 4.2 percent; cr: 15.1 percent; mo: 1.26 percent; w: 1.05 percent; mn: 0.35 percent; co: 2.1 percent; si: 0.25 percent; re: 0.025%, and the balance of iron and inevitable other impurity elements.
Comparative example 1
A flux-cored wire for a foot roller of a slab crystallizer comprises a flux coating and a flux core, wherein the flux coating is a steel strip 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 inevitable impurities. The purity of each component is shown in table one. The flow of the manufacturing method of the flux-cored wire is as described in example 1.
The welding process of the flux-cored wire manufactured in the comparative example 1 is the same as that of the example 1, and the difference is that the cladding metal is as follows: c: 0.05 percent; n: 0.05 percent; ni: 3.75 percent; cr: 12.3 percent; mo: 0.95 percent; w: 1.32 percent; mn: 0.35 percent; co: 1.51 percent; si: 0.23 percent; re: 0.018%, the balance being iron and unavoidable impurities.
The foot roller manufactured by the flux-cored wire in the embodiment 1 is in service for years in a certain steel company, and the steel passing amount of the foot roller is 23-28 ten thousand tons. Fig. 3 is a picture of a wide-side foot roller of a crystallizer after a steel amount of 27 ten thousand tons is discharged from a steel mill by using the flux-cored wire of example 1.
Practice shows that the invention can effectively prolong the service life of the foot roller working surface of the crystallizer. The flux-cored wire prepared in the comparative example 1 is used for the working surface of the foot roll of the crystallizer, and the service life is lower than that of the flux-cored wire prepared in the example 1.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of the invention, also features in the above embodiments or in different embodiments may be combined, 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 that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. A flux-cored wire for a foot roller of a slab crystallizer comprises a flux coating and a flux core. The flux-cored wire is characterized in that the flux 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, 3.0-5.0% 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 inevitable impurities.
2. The flux-cored wire for the foot roller of the slab crystallizer of claim 1, wherein the flux coating is a 08Al low-carbon steel strip with the thickness of 0.5mm and the width of 15 mm.
3. The flux-cored wire for the foot roller of the slab crystallizer as claimed in claim 1, wherein the particle size of the nickel powder is 60-120 meshes, the particle size of the tungsten powder is 100-120 meshes, the particle size of the molybdenum powder is 100-120 meshes, the particle size of the chromium powder is 80-100 meshes, the particle size of the cobalt powder is 150-200 meshes, the rare earth ferrosilicon powder is 80-100 meshes yttrium-based rare earth ferrosilicon powder, the particle size of the chromium iron nitride is 80-100 meshes, and the particle size of the ice crystal powder is 150-200 meshes K-3AlF6The granularity of the iron powder is 80-100 meshes.
4. The manufacturing method of the flux-cored wire for the foot roll of the slab crystallizer according to any one of claims 1 to 3, characterized by comprising the following steps of:
firstly, weighing the components of the medicine core according to the formula, and sequentially mixing, baking and distributing to form the medicine core;
and step two, conveying the steel strip to a rolling groove, then sequentially feeding the medicine and wrapping the edges by using a die, and reducing and drawing the steel strip for forming.
5. The manufacturing method of the flux-cored wire for the foot roller of the slab crystallizer as claimed in claim 4, wherein the mixing material in the first step is mixed and stirred for 8 hours by a powder stirrer, and the baking is to bake the mixed material in a tray into a box type resistance furnace for 8 hours at the temperature of 150 ℃ and 250 ℃.
6. The manufacturing method of the flux-cored wire for the foot roll of the slab crystallizer as claimed in claim 4, wherein a wire drawing and winding driving type wire making machine is adopted in the second step, and the flux-cored wire is subjected to drawing and reducing twice after being formed.
7. The manufacturing method of the flux-cored wire for the foot roll of the slab crystallizer as claimed in claim 4, wherein the flux-cored wire adopts a submerged arc surfacing welding process, the power supply adopts direct current frequency conversion, the forward and reverse connection is realized, the welding voltage is 32-36V, the current is 300-.
8. The welding method of the flux-cored wire for the foot roll of the slab crystallizer as claimed in 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 to 6 percent; cr: 14 to 16 percent; mo: 1 to 1.8 percent; w: 1.5 to 3 percent; co:1.9 to 2.7 percent; mn: 0.3-0.45%; si: 0.2 to 0.3 percent; re: 0.02-0.05%, and the balance of iron and inevitable impurity elements.
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Citations (7)
| 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 |
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| 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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2021
- 2021-08-25 CN CN202110981099.8A patent/CN113714681B/en active Active
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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 |
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| CN113714681B (en) | 2023-06-09 |
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