CN112935619B - Matched welding rod for welding martensitic steel serving at 630 ℃ for long time and preparation method thereof - Google Patents
Matched welding rod for welding martensitic steel serving at 630 ℃ for long time and preparation method thereof Download PDFInfo
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- CN112935619B CN112935619B CN202011391534.3A CN202011391534A CN112935619B CN 112935619 B CN112935619 B CN 112935619B CN 202011391534 A CN202011391534 A CN 202011391534A CN 112935619 B CN112935619 B CN 112935619B
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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
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
-
- 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
-
- 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
- B23K35/0272—Rods, electrodes, wires with more than one layer of coating or sheathing material
-
- 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
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3602—Carbonates, basic oxides or hydroxides
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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
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
-
- 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
- B23K35/404—Coated rods; Coated electrodes
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- Nonmetallic Welding Materials (AREA)
Abstract
A matched welding rod for welding 630 ℃ martensitic steel serving for a long time and a preparation method thereof are disclosed, wherein the welding rod comprises a core wire and a coating, the coating is wrapped on the surface of the core wire, and the core wire comprises the following components in percentage by mass: pr0.001-0.005wt%, ce0.05-0.15wt%, nd0.005-0.05wt%, la0.001-0.01wt%, ti0.001-0.010wt%, C0.05-0.15wt%, mn0.3-1.0wt%, si0.10-0.50wt%, cr8.0-10.5wt%, co2.0-4.0wt%, W2.0-4.0wt%, V0.10-0.50wt%, nb0.01-0.10wt%, N0.005-0.015wt%, B0.005-0.010wt%, ni0.10-0.30wt%, and the balance of Fe and inevitable impurities. The welding rod provided by the application has the advantages of excellent performance, smooth surface, high yield and stable eccentricity; the arc is stable during direct current reverse welding, no splashing basically exists, the slag detachability is good, the operation performance of the welding rod is excellent, and the all-position welding performance is excellent; the weld joint has the advantages of beautiful forming, moderate height of the weld bead, moderate infiltration angle of the weld joint and moderate physical and chemical properties of deposited metal.
Description
Technical Field
The invention belongs to the technical field of ultra-supercritical welding materials, and particularly relates to a matched welding rod for welding martensite steel serving at 630 ℃ for a long time and a preparation method thereof.
Background
At present, the steam parameter of the main ultra-supercritical thermal power generating unit in the world is 600 ℃, and nearly hundred ultra-supercritical thermal power generating units with the temperature of 600 ℃ are built in sequence in China since the first ultra-supercritical thermal power generating unit with the temperature of 600 ℃ in Yuhuan of Zhejiang in 1996 is put into operation. In order to further reduce coal consumption, improve heat efficiency and reduce emission, china starts a national development plan of 700 ℃ steam parameter ultra-supercritical thermal power generating units in 2010.
The heat-resistant material is the main bottleneck problem which restricts the development of the thermal power generating unit to high parameters, and the large-diameter boiler pipe and the header are the bottleneck problem in the bottleneck. The steam temperature in the 700 ℃ steam parameter ultra-supercritical thermal power generating unit boiler is gradually increased from 600 ℃ to 700 ℃, and each key temperature section needs to be provided with candidate heat-resistant materials meeting the use requirements. According to the current research result, the martensite heat-resistant steel P92 can be used for manufacturing large-caliber boiler tubes below the steam temperature of 620 ℃, and the nickel-based heat-resistant alloy CCA617 can be used for manufacturing large-caliber boiler tubes in the steam temperature range of 650-700 ℃. Because the austenitic heat-resistant steel has low heat conductivity and large thermal expansion coefficient, the austenitic heat-resistant steel is not suitable for manufacturing large-caliber boiler pipes of high-parameter ultra-supercritical thermal power generating units.
G115 steel is developed by combining a steel research institute and steel according to the project of 'basic research on the structure stability of high-temperature resistant martensitic steel' planned by the department of science and technology 973 and the project of 'development of key boiler tubes of advanced ultra-supercritical thermal power generating units' planned by 863. The G115 steel belongs to one of super-supercritical steels, is a martensitic steel and has the composition characteristic of 9Cr-3W-3Co. Compared with the traditional T/P92 steel, has higher service temperature and allowable stress, the method has wide application prospect in steam temperature boilers at 630-650 ℃, but can not find welding materials matched with the steel.
Disclosure of Invention
In view of the above problems, the present invention provides a mating electrode for welding of 630 ℃ martensitic steel for long term service and a method for making the same that overcomes or at least partially solves the above problems.
In order to solve the technical problem, the invention provides a matched welding rod for welding the martensitic steel which is used for 630 ℃ for a long time, the welding rod comprises a core wire and a coating, the coating is wrapped on the surface of the core wire, and the core wire comprises the following components in percentage by mass: pr0.001-0.005wt%, ce0.05-0.15wt%, nd0.005-0.05wt%, la0.001-0.01wt%, ti0.001-0.010wt%, C0.05-0.10wt%, mn0.3-0.5wt%, si0.10-0.20wt%, cr8.0-10.5wt%, co2.0-4.0wt%, W2.0-4.0wt%, V0.10-0.50wt%, nb0.01-0.10wt%, N0.001-0.007wt%, B0.005-0.010wt%, ni0.10-0.30wt%, and the balance of Fe and inevitable impurities.
Preferably, the coating comprises the following components in parts by weight:
CaCO3: 50-100 parts;
SrCO3: 300-500 parts;
and (2) CaF2: 100-200 parts;
SiO2: 40-70 parts;
TiO2: 40-70 parts;
na2CO3: 4-8 parts;
ZrO2: 4-8 parts;
AL2O3: 4-8 parts;
graphite: 1-2 parts;
electrolytic manganese: 10-30 parts;
rare earth oxide: 1 to 10 portions.
Preferably, the deposited metal in the core wire comprises, by mass fraction: pr0.001-0.005wt%, ce0.05-0.15wt%, nd0.005-0.05wt%, la0.001-0.01wt%, ti0.001-0.010wt%, C0.05-0.15wt%, mn0.3-1.0wt%, si0.10-0.50wt%, cr8.0-10.5wt%, co2.0-4.0wt%, W2.0-4.0wt%, V0.10-0.50wt%, nb0.01-0.10wt%, N0.005-0.015wt%, B0.005-0.010wt%, ni0.10-0.30wt%, and the balance of Fe and inevitable impurities.
The invention also provides a preparation method of the matched welding rod for welding the martensitic steel which is used for 630 ℃ for a long time, wherein the welding rod comprises the welding rod as described in any one of the above, and the method comprises the following steps:
preparing a core wire raw material and processing to prepare a core wire;
preparing raw materials of the coating, and stirring and mixing;
adding potassium sodium silicate into the medicinal skin raw material, and then carrying out extrusion and stirring for 3-10 minutes;
feeding the mixture into a bar press, wrapping the mixture on the surface of the core wire and preparing a welding rod;
baking the electrode at 80-100 ℃ for 2-3 hours;
baking the electrode at 380-400 ℃ for 1.5-2 hours.
Preferably, the concentration of the potassium sodium silicate is 42-43 degrees.
Preferably, the potassium sodium water glass is 240g to 250g.
Preferably, the core wire has a diameter of 2.5mm to 5.0mm.
Preferably, the length of the core wire is 300mm-400mm.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages: the matched welding rod for welding the martensite steel at 630 ℃ for a long time and the preparation method thereof have the advantages of excellent welding rod performance, smooth surface, high yield and stable eccentricity; the arc is stable during direct current reverse welding, no splashing basically exists, the slag detachability is good, the operation performance of the welding rod is excellent, and the all-position welding performance is excellent; the weld joint is beautiful in forming, the height of the weld bead is moderate, the penetration angle of the weld joint is moderate, and the physical and chemical properties of deposited metal are moderate; the provided welding rod is mainly used for G115 ultra-supercritical materials, the chemical components of weld deposit metals are strictly controlled, and particularly harmful impurity elements such As Sb, sn, as, B, S, P and the like are extremely low.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In the embodiment of the application, the invention provides a mating welding rod for welding martensitic steel which is used for 630 ℃ for a long time, the welding rod comprises a core wire and a coating, the coating is coated on the surface of the core wire, and the core wire comprises the following components in percentage by mass: pr0.001-0.005wt%, ce0.05-0.15wt%, nd0.005-0.05wt%, la0.001-0.01wt%, ti0.001-0.010wt%, C0.05-0.10wt%, mn0.3-0.5wt%, si0.10-0.20wt%, cr8.0-10.5wt%, co2.0-4.0wt%, W2.0-4.0wt%, V0.10-0.50wt%, nb0.01-0.10wt%, N0.001-0.007wt%, B0.005-0.010wt%, ni0.10-0.30wt%, and the balance of Fe and inevitable impurities.
In the embodiment of the application, the coating comprises the following components in parts by mass:
CaCO3: 50-100 parts;
SrCO3: 300-500 parts;
and (3) CaF2: 100-200 parts;
SiO2: 40-70 parts;
and (3) TiO2: 40-70 parts;
na2CO3: 4-8 parts;
ZrO2: 4-8 parts;
AL2O3: 4-8 parts;
graphite: 1-2 parts;
electrolytic manganese: 10-30 parts;
rare earth oxide: 1 to 10 portions.
In the embodiment of the application, the working principle of part of the raw materials in the coating is as follows:
CaCO3: the slag is built and the gas is made, the alkalinity of the slag is improved, the electric arc is stabilized, the interfacial tension and the surface tension between the slag and the metal are increased, the slag removal is improved, and the S removal capability is better;
SrCO3: gas making, electric arc blowing force is improved, slag removal is improved, and slag alkalinity is improved;
and (3) CaF2: the melting point and viscosity of the slag are adjusted, the fluidity of the slag is increased, the physical properties of the slag are improved, the slag has key effects on weld forming, slag removal and the like, and the slag is also a main material for reducing diffusible hydrogen in a weld, but the existence of fluorine can cause the instability of electric arc and generate toxic gas;
SiO2: the fluidity of the slag is increased, and the formation of a welding seam is improved;
TiO2: the welding rod has the main functions of slag building and arc stabilizing, and rutile is added to form a relevant bond for a welding seam in the invention;
na2CO3: improve the press coating performance of the welding rod.
In an embodiment of the present application, the deposited metal in the core wire includes, by mass fraction: pr0.001-0.005wt%, ce0.05-0.15wt%, nd0.005-0.05wt%, la0.001-0.01wt%, ti0.001-0.010wt%, C0.05-0.15wt%, mn0.3-1.0wt%, si0.10-0.50wt%, cr8.0-10.5wt%, co2.0-4.0wt%, W2.0-4.0wt%, V0.10-0.50wt%, nb0.01-0.10wt%, N0.005-0.015wt%, B0.005-0.010wt%, ni0.10-0.30wt%, and the balance of Fe and inevitable impurities.
In an embodiment of the present application, the present invention also provides a method for preparing a welding rod for welding martensitic steel that is used at 630 ℃ for a long time, the welding rod including the welding rod as described in the above, the method including the steps of:
preparing a raw material of a welding core and processing the raw material to prepare the welding core;
preparing raw materials of the coating, and stirring and mixing;
adding potassium sodium silicate into the medicinal skin raw material, and then carrying out extrusion and stirring for 3-10 minutes;
feeding the mixture into a bar press, coating the mixture on the surface of the core wire and preparing a welding rod;
baking the electrode at 80-100 ℃ for 2-3 hours;
baking the electrode at 380-400 ℃ for 1.5-2 hours.
In the embodiment of the application, the concentration of the potassium-sodium water glass is 42-43 degrees, and the concentration of the potassium-sodium water glass is 240-250 g. The sodium potassium silicate glass is mainly used as an adhesive for enhancing the adhesion of the coating raw materials and subsequent welding.
In the embodiment of the application, the diameter of the core wire is 2.5mm-5.0mm, and the length of the core wire is 300mm-400mm. The welding core with the specification can meet the welding requirement.
The present application will be described in detail with specific examples below.
Example 1
In this embodiment, the core wire comprises the following components by mass fraction: pr0.002wt%, ce0.06wt%, nd 0.007wt%, la 0.003wt%, ti 0.002wt%, C0.07 wt%, mn0.3 wt%, si0.10 wt%, cr 9.5wt%, co 3.5wt%, W3.0 wt%, V0.3 wt%, nb 0.05wt%, N0.002 wt%, B0.009 wt%, ni 0.30wt%, and the balance of Fe and impurities.
In this embodiment, the ingredients of the coating are:
CaCO3：120g；
SrCO3：700g；
CaF2：300g；
SiO2：100g；
TiO2：100g；
Na2CO3：10g；
ZrO2：10g；
AL2O3：10g；
graphite: 2g of the total weight of the mixture;
electrolytic manganese 40g;
and 10g of rare earth oxide.
When preparing a welding rod, firstly preparing a core wire raw material and processing to prepare a core wire, and then preparing a coating raw material and stirring and mixing; adding 240g of sodium-potassium water glass with the concentration of 42-42.5 ℃ into the coating raw material, then expelling and stirring for 5 minutes, then feeding the mixture into a bar press, coating the mixture on the surface of a core wire with the specification of 4.0mm (the weight of the core wire is 1000 g), and baking for 2 hours at the low temperature of 88 ℃ and 1.5 hours at the high temperature of 380 ℃ to obtain the welding rod.
The prepared welding rod (direct current reverse welding) is subjected to welding test, the electric arc is stable, the splashing is basically avoided, the slag removal performance is good, and the welding seam is attractive in appearance. Welding test the welding base material was G115 steel.
In the embodiment, the chemical compositions of deposited metal of the welding rod are as follows: pr0.002wt%, ce0.06wt%, nd 0.006wt%, la 0.002wt%, ti 0.007wt%, C0.08 wt%, mn 0.7wt%, si 0.20wt%, cr 8.9wt%, co 2.9wt%, W2.7 wt%, V0.19 wt%, nb 0.03wt%, N0.015 wt%, B0.006 wt%, ni 0.20wt%, and the balance of Fe and impurities.
In this embodiment, the weld deposit metal is maintained at 760 ℃ for 2-20 hours, and the mechanical properties of the weld deposit metal are shown in table 1:
TABLE 1 mechanical Properties of deposited metal by welding rod
Example 2
The core wires in this experimental example were the same as in example 1.
In the embodiment of the application, the components of the coating are as follows:
CaCO3：120g；
SrCO3：700g；
CaF2：300g；
SiO2：100g；
TiO2：100g；
Na2CO3：10g；
ZrO2：10g；
AL2O3：10g；
graphite: 3g of the total weight of the mixture;
50g of electrolytic manganese;
and 10g of rare earth oxide.
When preparing a welding rod, firstly preparing a core wire raw material and processing to prepare a core wire, and then preparing a coating raw material and stirring and mixing; adding 250g of potassium-sodium water glass with the concentration of 43 degrees into the coating raw material, then carrying out expelling and stirring for 6 minutes, then feeding the mixture into a strip press, wrapping the mixture on the surface of a core wire with the specification of 3.2mm (the weight of the core wire is 1000 g), and baking for 2 hours at the low temperature of 88 ℃ and 1.5 hours at the high temperature of 380 ℃ to obtain the welding rod.
The prepared welding rod (direct current reverse welding) is subjected to a welding test, the electric arc is stable, splashing does not exist basically, the slag removal performance is good, and the formed welding line is attractive.
In this embodiment, the chemical composition of the deposited metal of the electrode is: pr0.002wt%, ce0.06wt%, nd 0.006wt%, la 0.002wt%, ti 0.007wt%, C0.09 wt%, mn 0.9wt%, si 0.20wt%, cr 8.9wt%, co 2.9wt%, W2.7 wt%, V0.19 wt%, nb 0.03wt%, N0.015 wt%, B0.006 wt%, ni 0.20wt%, and the balance of Fe and impurities.
In this embodiment, the weld deposit metal is maintained at 760 ℃ for 2-20 hours, and the mechanical properties of the electrode deposit metal are shown in table 2:
TABLE 2 mechanical properties of deposited metal of welding rod
The content of diffused hydrogen of deposited metal is as follows: 2.5ml/100g.
Experiments of examples 1 and 2 show that the welding rod obtained by the preparation method provided by the application can be used for welding the martensitic steel which is used for a long time at 630 ℃.
The matched welding rod for welding the martensitic steel which is in service at 630 ℃ for a long time and the preparation method thereof have the advantages of excellent welding rod performance, smooth surface, high yield and stable eccentricity; the arc is stable during direct current reverse welding, no splashing basically exists, the slag detachability is good, the operation performance of the welding rod is excellent, and the all-position welding performance is excellent; the weld joint is beautiful in forming, the height of the weld bead is moderate, the penetration angle of the weld joint is moderate, and the physical and chemical properties of deposited metal are moderate; the provided welding rod is mainly used for G115 ultra-supercritical materials, the chemical components of weld deposit metals are strictly controlled, and particularly harmful impurity elements such As Sb, sn, as, B, S, P and the like are extremely low.
It is noted that, in this document, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "...," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element. The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
In short, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The matched welding rod for welding the 630 ℃ martensitic steel serving for a long time is characterized by comprising a core wire and a coating, wherein the coating is wrapped on the surface of the core wire, and the core wire comprises the following components in percentage by mass: pr0.001-0.005wt%, ce0.05-0.15wt%, nd0.005-0.05wt%, la0.001-0.01wt%, ti0.001-0.010wt%, C0.05-0.10wt%, mn0.3-0.5wt%, si0.10-0.20wt%, cr8.0-10.5wt%, co2.0-4.0wt%, W2.0-4.0wt%, V0.10-0.50wt%, nb0.01-0.10wt%, N0.001-0.007wt%, B0.005-0.010wt%, ni0.10-0.30wt%, and the balance of Fe and inevitable impurities, wherein the medicine skin comprises the following components in parts by mass:
50-100 parts of CaCO 3;
300-500 parts of SrCO 3;
100 to 200 portions of CaF 2;
40-70 parts of SiO 2;
40-70 parts of TiO 2;
na2CO3: 4-8 parts;
4-8 parts of ZrO 2;
AL2O3: 4-8 parts;
graphite: 1-2 parts;
electrolytic manganese: 10-30 parts;
oxidizing rare earth: 1-10 parts;
according to the mass fraction, the deposited metal in the welding rod comprises: pr0.001-0.005wt%, ce0.05-0.15wt%, nd0.005-0.05wt%, la0.001-0.01wt%, ti0.001-0.010wt%, C0.05-0.15wt%, mn0.3-1.0wt%, si0.10-0.50wt%, cr8.0-10.5wt%, co2.0-4.0wt%, W2.0-4.0wt%, V0.10-0.50wt%, nb0.01-0.10wt%, N0.005-0.015wt%, B0.005-0.010wt%, ni0.10-0.30wt%, and the balance Fe and inevitable impurities.
2. A method of making a mating electrode for welding martensitic steel that has been in service at 630 ℃ for a long period of time, said electrode comprising the electrode of claim 1, said method comprising the steps of:
preparing a core wire raw material and processing to prepare a core wire;
preparing the raw materials of the coating, and stirring and mixing;
adding potassium sodium silicate into the medicinal skin raw material, and then carrying out extrusion and stirring for 3-10 minutes;
feeding the mixture into a bar press, coating the mixture on the surface of the core wire and preparing a welding rod;
baking the electrode at 80-100 ℃ for 2-3 hours;
baking the electrode at 380-400 ℃ for 1.5-2 hours.
3. The method of claim 2, wherein the concentration of the kali-sodium water glass is 42 ° to 43 °.
4. The method for preparing a welding electrode for welding martensitic steel that is in service at 630 ℃ for a long time according to claim 2, wherein the amount of the kalium-sodium water glass is 240g to 250g.
5. The method of claim 2, wherein the core wire has a diameter of 2.5mm to 5.0mm.
6. The method of claim 2, wherein the core wire has a length of 300mm to 400mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011391534.3A CN112935619B (en) | 2020-12-01 | 2020-12-01 | Matched welding rod for welding martensitic steel serving at 630 ℃ for long time and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011391534.3A CN112935619B (en) | 2020-12-01 | 2020-12-01 | Matched welding rod for welding martensitic steel serving at 630 ℃ for long time and preparation method thereof |
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| Publication Number | Publication Date |
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| CN112935619A CN112935619A (en) | 2021-06-11 |
| CN112935619B true CN112935619B (en) | 2023-04-18 |
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