CN116000499A - Build-up welding powder core welding wire with wear resistance and extremely low thermal crack sensitivity - Google Patents
Build-up welding powder core welding wire with wear resistance and extremely low thermal crack sensitivity Download PDFInfo
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- CN116000499A CN116000499A CN202310125985.XA CN202310125985A CN116000499A CN 116000499 A CN116000499 A CN 116000499A CN 202310125985 A CN202310125985 A CN 202310125985A CN 116000499 A CN116000499 A CN 116000499A
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- 238000003466 welding Methods 0.000 title claims abstract description 74
- 230000035945 sensitivity Effects 0.000 title claims abstract description 15
- 239000000843 powder Substances 0.000 title claims description 36
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 238000004227 thermal cracking Methods 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 4
- 230000008901 benefit Effects 0.000 claims description 6
- 239000008358 core component Substances 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 abstract description 8
- 239000011324 bead Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 13
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Abstract
The invention relates to a build-up welding powder-cored wire with abrasion resistance and extremely low thermal cracking sensitivity, which is used for the build-up welding powder-cored wire with abrasion resistance and extremely low thermal cracking sensitivity of the severely worn part of a circulating fluidized bed boiler; the bead welding powder-cored wire comprises the following powder-cored components in percentage by mass: 0.2 to 0.5 percent of C, 8 to 16 percent of Cr, 1 to 3 percent of Mo, 0.5 to 2 percent of Ni, 0.2 to 1 percent of Ti, 0.2 to 1 percent of Nb, 1 to 2 percent of Mn, 0.5 to 1.5 percent of B, 1 to 2.5 percent of Si, 0.1 to 0.5 percent of RE, 2 5 to 15 percent of TiB, 3 to 5 percent of Nb2N, 0 to 2 percent of NaF, 2 0 to 3.5 percent of CaF, 30 to 2.5 percent of K2CO and the balance of Fe.
Description
Technical Field
The invention relates to a build-up welding powder-cored wire with extremely low wear resistance and thermal cracking sensitivity, which is used for the wear resistance and thermal cracking sensitivity of the severely worn part of a circulating fluidized bed boiler and is applied to the wear protection of irregular tube walls such as tube walls, bent tubes, wall penetrating tubes, welding lines and the like, around the outlet of a flue of the hearth and the like of the transition zone and the water-cooled wall of the lower part of the hearth of the circulating fluidized bed boiler.
Background
The circulating fluidized bed boiler has the advantages of wide fuel adaptability (high-quality coal, high-sulfur coal, high-ash high-sulfur coal, coal gangue, peat and the like), high combustion efficiency (97.5% -99.5%), high-efficiency desulfurization (more than 90%), low emission of nitrogen oxides and other pollutants, wide load regulation range, small hearth cross section area and the like, and is one of economic and effective low-pollution combustion technologies. Due to the flow characteristics of materials in the circulating fluidized bed boiler, the materials in the hearth are strongly back mixed, and a great amount of materials scour heating surfaces are caused while the heat load of the hearth is more uniform than that of a pulverized coal furnace, so that the metal parts of the circulating fluidized bed boiler are seriously worn, especially, the special parts are worn, the wear degree is abnormally raised, such as the transition areas of a sanitation burning belt and a water cooling wall at the lower part of the hearth, the pipe walls of four corner areas of the hearth, irregular pipe walls such as bent pipes, through-wall pipes and welding seams, the periphery of a hearth flue outlet and the like, and the most serious wear degree can reach 5mm/1000h. In order to solve the serious abrasion problem of the circulating fluidized bed boiler, various surface technology methods are generally adopted to carry out abrasion prevention on boiler metal parts, such as nitriding or chromizing, electroplating and hot dip plating, protection tiles, hot spraying, spray welding, surfacing welding and the like of a furnace tube. In recent years, for protecting the severely worn part of the circulating fluidized bed boiler, a surfacing technology is widely adopted, and the technology is a very effective wear-resistant method. However, the wear-resistant material is the most critical core of quality effect guarantee of the surfacing technology, and the wear-resistant effect of the boiler is determined by the advantages and disadvantages of the welding material. Various anti-abrasion welding materials for the circulating fluidized bed boiler are developed at home and abroad in succession in the past, are known according to industry market information and practical experience, but have defects such as poor professional applicability of materials, poor welding manufacturability, unsmooth welding, conductive nozzle adhesion, large splashing, poor welding bead formability, easiness in generating air holes, cracking of welding layers, low hardness of welding layers, poor high-temperature abrasion performance or high material cost and the like, and the application of the welding materials is affected to a certain extent by the problems. Thus, for some special parts of the circulating fluidized bed boiler which are severely worn,
disclosure of Invention
The invention aims at solving the problems of rapid wear thinning, pipe explosion penetration and the like of a part with serious wear of a circulating fluidized bed boiler, and provides a build-up welding powder core welding wire with extremely low wear resistance and thermal cracking sensitivity for the part with serious wear of the circulating fluidized bed boiler.
The welding wire material is very suitable for the working condition of the circulating fluidized bed boiler, has good welding manufacturability, extremely small splashing, attractive weld bead formability, no air holes generated in the welding layer, no cracks inside and outside the welding layer, high hardness of the welding layer, very low friction coefficient, excellent wear resistance and reasonable material cost, and the product technology reaches or exceeds the advanced level abroad, thereby realizing the high-efficiency protection of serious wear of the heating surface of the circulating fluidized bed boiler in China.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the surfacing powder-core welding wire with extremely low wear resistance and thermal crack sensitivity for the severely worn part of the circulating fluidized bed boiler provided by the invention is formed by adopting a low-carbon steel sheath to wrap a powder core, rolling, drawing by a plurality of channels and reducing the diameter.
A build-up welding powder-core welding wire with wear resistance and extremely low thermal crack sensitivity comprises the following powder-core components in percentage by mass:
0.2 to 0.5 percent of C, 8 to 16 percent of Cr, 1 to 3 percent of Mo, 0.5 to 2 percent of Ni, 0.2 to 1 percent of Ti, 0.2 to 1 percent of Nb, 1 to 2 percent of Mn, 0.5 to 1.5 percent of B, 1 to 2.5 percent of Si, 0.1 to 0.5 percent of RE, 2 5 to 15 percent of TiB, 3 to 5 percent of Nb2N, 0 to 2 percent of NaF, 2 0 to 3.5 percent of CaF, 30 to 2.5 percent of K2CO and the balance of Fe.
Further, the powder core filling rate of the powder core welding wire is 26% -30%.
Further, the powder core particle size of the powder core welding wire is 70-300 meshes.
The preparation method of the powder-cored welding wire comprises the following steps:
a carbon steel strip with the width of 10mm and the thickness of 0.35mm is taken as an outer cladding, the steel strip is rolled into a U shape, and then the powder is added into a U-shaped groove according to the powder core powder ratio in the welding wire. And then the U-shaped groove is sealed, so that the powder is wrapped in the U-shaped groove, and the powder-cored welding wire with the diameter of phi 1.6mm is manufactured through the processing procedures of rolling by a forming machine, drawing by a wire drawing machine, reducing the diameter and the like.
The surfacing powder-cored welding wire with extremely low abrasion resistance and thermal crack sensitivity for the severely worn part of the circulating fluidized bed boiler is suitable for various welding equipment such as MIG, MAG or CO2 gas shielded welding and the like, and can adopt manual welding or automatic welding. The welding process does not need preheating, can directly build up welding on the surface of a workpiece, has no crack on a build-up welding layer, good welding process, smooth wire running, no adhesion of a conductive nozzle, almost no splashing, attractive weld bead formability, high weld layer hardness, very low friction coefficient, higher hardness especially at the high temperature of more than 500-600 ℃, and excellent high-temperature wear resistance, and the friction coefficient is only about 1/3 of that of the existing standard welding wire.
On one hand, the weld joint structure can be self-quenched to form a martensitic structure in an air cooling environment in the welding process, and the weld joint structure has fine grains and uniform structure refinement, so that the high hardness, strength and toughness of the weld joint are ensured; on the other hand, delta ferrite rich in Cr, mo, W and the like and having large brittleness is hardly precipitated in the welding seam, so that the low hot cracking sensitivity of the welding seam structure is ensured, and the generation of cracks is avoided.
Drawings
FIG. 1 is a view showing the appearance of a weld layer formed by overlaying a tube row of a circulating fluidized bed boiler with a cored wire of the present invention;
FIG. 2 is a cross-sectional metallographic structure of a weld layer;
FIG. 3 is a graph of the coefficient of friction of a weld layer at 600 ℃.
Description of the embodiments
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described and illustrated below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on the embodiments provided herein, are intended to be within the scope of the present application.
It is apparent that the drawings in the following description are only some examples or embodiments of the present application, and it is possible for those of ordinary skill in the art to apply the present application to other similar situations according to these drawings without inventive effort. Moreover, it should be appreciated that while such a development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as having the benefit of this disclosure.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly and implicitly understood by those of ordinary skill in the art that the embodiments described herein can be combined with other embodiments without conflict.
A build-up welding powder-core welding wire with wear resistance and extremely low thermal crack sensitivity comprises the following powder-core components in percentage by mass:
0.2 to 0.5 percent of C, 8 to 16 percent of Cr, 1 to 3 percent of Mo, 0.5 to 2 percent of Ni, 0.2 to 1 percent of Ti, 0.2 to 1 percent of Nb, 1 to 2 percent of Mn, 0.5 to 1.5 percent of B, 1 to 2.5 percent of Si, 0.1 to 0.5 percent of RE, 2 5 to 15 percent of TiB, 3 to 5 percent of Nb2N, 0 to 2 percent of NaF, 2 0 to 3.5 percent of CaF, 30 to 2.5 percent of K2CO and the balance of Fe.
Further, the powder core filling rate of the powder core welding wire is 26% -30%.
Further, the powder core particle size of the powder core welding wire is 70-300 meshes.
The preparation method of the powder-cored welding wire comprises the following steps:
a carbon steel strip with the width of 10mm and the thickness of 0.35mm is taken as an outer cladding, the steel strip is rolled into a U shape, and then the powder is added into a U-shaped groove according to the powder core powder ratio in the welding wire. And then the U-shaped groove is sealed, so that the powder is wrapped in the U-shaped groove, and the powder-cored welding wire with the diameter of phi 1.6mm is manufactured through the processing procedures of rolling by a forming machine, drawing by a wire drawing machine, reducing the diameter and the like.
The surfacing powder-cored welding wire with extremely low abrasion resistance and thermal crack sensitivity for the severely worn part of the circulating fluidized bed boiler is suitable for various welding equipment such as MIG, MAG or CO2 gas shielded welding and the like, and can adopt manual welding or automatic welding. The welding process does not need preheating, can directly build up welding on the surface of a workpiece, has no crack on a build-up welding layer, good welding process, smooth wire running, no adhesion of a conductive nozzle, almost no splashing, attractive weld bead formability, high weld layer hardness, very low friction coefficient, higher hardness especially at the high temperature of more than 500-600 ℃, and excellent high-temperature wear resistance, and the friction coefficient is only about 1/3 of that of the existing standard welding wire.
On one hand, the weld joint structure can be self-quenched to form a martensitic structure in an air cooling environment in the welding process, and the weld joint structure has fine grains and uniform structure refinement, so that the high hardness, strength and toughness of the weld joint are ensured; on the other hand, delta ferrite rich in Cr, mo, W and the like and having large brittleness is hardly precipitated in the welding seam, so that the low hot cracking sensitivity of the welding seam structure is ensured, and the generation of cracks is avoided.
Examples
Taking 0.3% of C, 8% of Cr, 2% of Mo, 0.8% of Ni, 0.4% of Ti, 0.6% of Nb, 2% of Mn, 0.8% of B, 2% of Si, 0.2% of RE, 10% of TiB, 2N 3% of Nb, 1% of NaF, 1.5% of CaF, 1.5% of K2CO3 2% of Fe and the balance. Putting the various taken powder into a powder mixer, fully stirring, uniformly mixing, rolling the steel strip into a U shape by adopting a carbon steel strip with the width of 10mm and the thickness of 0.35mm as a skin, putting the uniformly mixed powder into the carbon steel strip, closing a U-shaped groove of the carbon steel strip to ensure that the powder is wrapped, and manufacturing the powder-cored welding wire with the diameter of phi 1.6mm by adopting the processing procedures of rolling by a forming machine, drawing by a wire drawing machine, reducing the diameter and the like.
Examples
Taking 0.4% of C, 12% of Cr, 2% of Mo, 2% of Ni, 0.8% of Ti, 0.6% of Nb, 1% of Mn, 0.8% of B, 1% of Si, 0.1% of RE, 2 9% of TiB, 2N 3% of Nb, 1% of NaF, 2 2% of CaF, 1.5% of K2CO and the balance of Fe. Putting the various taken powder into a powder mixer, fully stirring, uniformly mixing, rolling the steel strip into a U shape by adopting a carbon steel strip with the width of 10mm and the thickness of 0.35mm as a skin, putting the uniformly mixed powder into the carbon steel strip, closing a U-shaped groove of the carbon steel strip to ensure that the powder is wrapped, and manufacturing the powder-cored welding wire with the diameter of phi 1.6mm by adopting the processing procedures of rolling by a forming machine, drawing by a wire drawing machine, reducing the diameter and the like.
Examples
Taking 0.35% of C, 9% of Cr, 1% of Mo, 1.5% of Ni, 0.6% of Ti, 0.3% of Nb, 1.5% of Mn, 0.5% of B, 2% of Si, 0.2% of RE, 26% of TiB, 5% of Nb2N, 2% of NaF, 2 3% of CaF, 3 1% of K2CO and the balance of Fe. Putting the various taken powder into a powder mixer, fully stirring, uniformly mixing, rolling the steel strip into a U shape by adopting a carbon steel strip with the width of 10mm and the thickness of 0.35mm as a skin, putting the uniformly mixed powder into the carbon steel strip, closing a U-shaped groove of the carbon steel strip to ensure that the powder is wrapped, and manufacturing the powder-cored welding wire with the diameter of phi 1.6mm by adopting the processing procedures of rolling by a forming machine, drawing by a wire drawing machine, reducing the diameter and the like.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (3)
1. The surfacing powder-core welding wire with the advantages of wear resistance and extremely low thermal cracking sensitivity is characterized by comprising the following powder-core components in percentage by mass:
0.2 to 0.5 percent of C, 8 to 16 percent of Cr, 1 to 3 percent of Mo, 0.5 to 2 percent of Ni, 0.2 to 1 percent of Ti, 0.2 to 1 percent of Nb, 1 to 2 percent of Mn, 0.5 to 1.5 percent of B, 1 to 2.5 percent of Si, 0.1 to 0.5 percent of RE, 2 5 to 15 percent of TiB, 3 to 5 percent of Nb2N, 0 to 2 percent of NaF, 2 0 to 3.5 percent of CaF, 30 to 2.5 percent of K2CO and the balance of Fe.
2. The wear resistant and extremely low thermal crack susceptibility weld overlay powder cored wire of claim 1, wherein: the powder core filling rate of the powder core welding wire is 26% -30%.
3. The wear resistant and extremely low thermal crack susceptibility weld overlay powder cored wire of claim 1, wherein: the powder core powder granularity of the powder core welding wire is 70-300 meshes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310125985.XA CN116000499A (en) | 2023-02-17 | 2023-02-17 | Build-up welding powder core welding wire with wear resistance and extremely low thermal crack sensitivity |
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| CN202310125985.XA CN116000499A (en) | 2023-02-17 | 2023-02-17 | Build-up welding powder core welding wire with wear resistance and extremely low thermal crack sensitivity |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1478632A (en) * | 2003-08-08 | 2004-03-03 | 北京工业大学 | High hardness high abrasive self protecting pile up welding flux core welding wire |
| JP2010253516A (en) * | 2009-04-27 | 2010-11-11 | Nippon Steel & Sumikin Welding Co Ltd | Metal-based flux cored wire for gas shielded arc welding for hardfacing |
| CN101934443A (en) * | 2010-09-17 | 2011-01-05 | 江西恒大高新技术股份有限公司 | Self-protective flux-cored soldering wire for surfacing of abrasion-resistant plate |
| CN102744532A (en) * | 2011-04-19 | 2012-10-24 | 王新虎 | Iron-based abrasion resisting and reducing surfacing flux-cored wire |
| CN103240547A (en) * | 2013-05-09 | 2013-08-14 | 太原理工大学 | Method for manufacturing TiB<2> ceramic-reinforced wear-resistant surfacing flux-cored welding wire |
| JP2018144045A (en) * | 2017-03-01 | 2018-09-20 | 日鐵住金溶接工業株式会社 | FLUX-CORED WIRE FOR 9% Ni STEEL WELDING |
| CN110788520A (en) * | 2019-11-20 | 2020-02-14 | 桂林航天工业学院 | High-alloy steel wear-resistant flux-cored wire and preparation method thereof |
| JP2021109208A (en) * | 2020-01-10 | 2021-08-02 | 日本製鉄株式会社 | Flux-cored wire and method for manufacturing weld joint |
-
2023
- 2023-02-17 CN CN202310125985.XA patent/CN116000499A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1478632A (en) * | 2003-08-08 | 2004-03-03 | 北京工业大学 | High hardness high abrasive self protecting pile up welding flux core welding wire |
| JP2010253516A (en) * | 2009-04-27 | 2010-11-11 | Nippon Steel & Sumikin Welding Co Ltd | Metal-based flux cored wire for gas shielded arc welding for hardfacing |
| CN101934443A (en) * | 2010-09-17 | 2011-01-05 | 江西恒大高新技术股份有限公司 | Self-protective flux-cored soldering wire for surfacing of abrasion-resistant plate |
| CN102744532A (en) * | 2011-04-19 | 2012-10-24 | 王新虎 | Iron-based abrasion resisting and reducing surfacing flux-cored wire |
| CN103240547A (en) * | 2013-05-09 | 2013-08-14 | 太原理工大学 | Method for manufacturing TiB<2> ceramic-reinforced wear-resistant surfacing flux-cored welding wire |
| JP2018144045A (en) * | 2017-03-01 | 2018-09-20 | 日鐵住金溶接工業株式会社 | FLUX-CORED WIRE FOR 9% Ni STEEL WELDING |
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| JP2021109208A (en) * | 2020-01-10 | 2021-08-02 | 日本製鉄株式会社 | Flux-cored wire and method for manufacturing weld joint |
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