CN111590239B - Martensite heat-resistant steel welding rod for ultra-supercritical thermal power generating unit and preparation method thereof - Google Patents
Martensite heat-resistant steel welding rod for ultra-supercritical thermal power generating unit and preparation method thereof Download PDFInfo
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0272—Rods, electrodes, wires with more than one layer of coating or sheathing material
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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
- B23K35/3601—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
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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
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/404—Coated rods; Coated electrodes
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Abstract
The invention discloses a martensite heat-resistant steel welding rod for an ultra-supercritical thermal power generating unit and a preparation method thereof3‑CaF2‑K3AlF6The slag system is formed by coating a coating on the outer wall of the welding core, and the weight coefficient of the coating accounting for the total weight of the welding rod is 0.38-0.52. The welding rod has excellent all-position welding process performance of the pipeline, strong and stable electric arc, moderate welding seam infiltration angle, excellent slag removal and attractive welding seam forming. Besides high strength and high durability similar to those of the parent metal, the welded deposited metal also has the characteristics of extremely low hydrogen (diffusible hydrogen H is less than 2) and high toughness (impact toughness KV2 is more than or equal to 100J at the normal temperature of 20 ℃).
Description
Technical Field
The invention belongs to the field of welding materials, and particularly relates to a martensite heat-resistant steel welding rod for an ultra-supercritical thermal power generating unit and a preparation method thereof.
Background
With the great demand for electric power brought by the rapid development of national economy in recent years, related departments and enterprises urgently need to improve the efficiency of construction and operation of power stations, reduce the cost and protect the environment. The development of ultra-supercritical boiler units under such conditions has become the leading direction for the construction of power stations. The novel martensite heat-resistant steel G115 has excellent structure stability and endurance strength at the temperature of 620-650 ℃, the endurance strength of the martensite heat-resistant steel G115 is 1.5 times that of P92 steel, the high-temperature steam oxidation corrosion resistance of the martensite heat-resistant steel G is superior to that of P92 steel, and the excellent performance of the martensite heat-resistant steel G115 can be applied to the fields of ultra-supercritical boiler high-temperature and high-pressure parts and the like. Therefore, the research and development of the matched welding materials are very important. Particularly, the welding material needs to have the same high-temperature endurance strength, high-temperature creep resistance, good joint toughness and crack resistance and the like as the base material, and higher requirements are put forward for the research and development work.
The novel martensite heat-resistant steel G115 independently developed in China can be used for manufacturing large-diameter boiler pipes and becomes a preferred material for the main steam pipeline of the 630 ℃ and 650 ℃ ultra-supercritical coal-fired demonstration power station in China in the future.
It is well known that high strength and hardness are the most remarkable mechanical properties of martensitic steels, but the martensitic structure is relatively poor in plasticity and toughness compared to ferrite and austenite, and is relatively poor in weldability due to its relatively high C content and is more susceptible to hydrogen induced cracking. The novel martensite heat-resistant steel G115 is used for large-diameter boiler pipes, the matching of the strength, plasticity and toughness of a welding joint and a base metal is a bottleneck limiting the service life and quality of an ultra-supercritical thermal power generating unit, and therefore the problem that the existing G115 steel thermal power generating unit is urgently to be solved is to develop a matched welding material which simultaneously has high strength and high creep property, is equivalent to the base metal and even has toughness.
Disclosure of Invention
In order to solve the technical problem, the invention provides a martensite heat-resistant steel welding rod for an ultra-supercritical thermal power generating unit, which adopts novel CaCO3-CaF2-K3AlF6The slag system has excellent all-position welding process performance of the pipeline, strong and stable electric arc, moderate welding seam infiltration angle, excellent slag removal and attractive welding seam forming. Besides high strength and high durability similar to those of the parent metal, the welded deposited metal also has the characteristics of extremely low hydrogen (diffusible hydrogen H is less than 2) and high toughness.
The technical scheme of the invention is as follows: a martensite heat-resistant steel welding rod for an ultra-supercritical thermal power generating unit comprises a core wire and a coating, wherein the coating is coated on the outer wall of the core wire, the core wire adopts a G115 homogeneous core wire, and the coating accounts for 0.38-0.52 of the total weight coefficient of the welding rod;
(a) based on the total weight of the core wire, the core wire comprises the following components in percentage by weight: c: 0.08-0.10%; si: 0.25-0.45%; mn: 0.45-0.65%; p: less than or equal to 0.005 percent; s: less than or equal to 0.003 percent; ni: 0.30-0.62%; cr: 8.0-9.5%; co: 2.7-3.2%; w: co: 2.7-3.2%; v: 0.15-0.25%; nb: 0.02-0.04%; n: less than or equal to 0.01 percent; b: 0.008-0.012%; fe: and (4) the balance.
(b) The coating adopts novel CaCO3-CaF2-K3AlF6The slag system comprises the following components in percentage by weight based on the total weight of the welding flux: and (3) marble: 12 to 22; barium carbonate: 4-16%; calcium fluoride: 6-18%; lanthanum fluoride: 3-15%; elpasolite: 8-20%; rutile: 3-8%; titanium dioxide: 1-2.5%; metal manganese: 2.5-4%; silicon iron: 2-5%; titanium iron: 2-4%;alginate: 0.5-1.5%; the balance of iron powder.
The deposited metal of the martensite heat-resistant steel electrode for the ultra-supercritical thermal power generating unit comprises the following components in percentage by weight: c: 0.07-0.12%; mn: 0.5-1.2%; si: less than or equal to 0.5 percent; p: less than or equal to 0.008 percent; s: less than or equal to 0.005 percent; ni: 0.28-0.52%; cr: 8.0-9.5%; co: 2.6-3.5%; w: co: 2.7-3.5%; v: 0.15-0.26%; nb: 0.02-0.06%; n: 0.005-0.025%; b: 0.006-0.018%; fe: and (4) the balance.
The invention also provides a preparation method of the martensite heat-resistant steel welding rod for the ultra-supercritical thermal power generating unit, which comprises the following steps:
1) uniformly mixing the components of the coating according to a proportion;
2) adding a binder which accounts for 20-30% of the total weight of the medicinal powder, stirring and mixing uniformly, and then uniformly coating the medicinal powder on the welding core by using an oil pressure type coating machine under the pressure of 12-15 Mpa; the binder adopts Li-Na mixed water glass which is automatically prepared and added with moisture absorption resistant additives, and is characterized in that;
a) Li-Na mixed water glass parameters: li2O/Na2O is (1-1.5) to 10, the modulus is 2.90-3.30, and the concentration is 33-38 Be;
b) the moisture absorption resistant additive comprises the following components: calcium oxide: 10-38%; boric acid: 3-8%; alumina: 5-30%; quartz sand: 3-20%; zinc oxide: 5-15%; the particle sizes of the raw materials are all 8-20 mu m;
c) putting the moisture absorption resistant additive into Li-Na mixed water glass according to the mass fraction of 8-15%, fully stirring and uniformly mixing, and heating at 80 ℃ for 2h to obtain the welding rod binder used by the invention;
3) and baking the pressed wet welding rod at a low temperature of 80-100 ℃ for 2 hours and a high temperature of 350-400 ℃ for 1 hour to obtain the welding rod.
The G115 homogeneous welding core innovatively smelted by the invention removes the element Cu through repeated smelting adjustment on the basis of patents CN 106346167A and CN 106425158A, adds the alloy Ni, properly improves the content of the alloy Si, and limits the element B in a more accurate range to obtain a more uniform and fine tempered martensite structure after welding metallurgy and heat treatment, so that a welding seam obtains the best matching of strength and toughness, and the toughness of deposited metal is greatly improved (the welding rod of the invention has normal temperature impact KV2 at 20 ℃ of more than or equal to 100J), which is a significant breakthrough for a matched welding rod for G115 steel.
The invention adopts novel CaCO3-CaF2-K3AlF6The slag system is particularly suitable for all-position welding of G115 pipelines, the fluidity and the surface tension of welding slag are moderate, the wetting angle of molten iron is proper, the welding slag is uniformly covered, thin and loose, the slag removal is excellent, and the formed welding line is smooth and attractive. The slag system has stronger deoxidation and lower oxygen content in the welding seam, which is one of the key factors of high toughness of the welding seam.
The binder is prepared by self and added with Li-Na mixed water glass with moisture-absorption-resistant additives, and the binder can be solidified on the surface of a welding rod after being dried to form a layer of compact protective film, so that the welding rod has excellent moisture absorption resistance and extremely low hydrogen diffusion, and the detection shows that the hydrogen diffusion H of the welding rod is less than 2, which is the main reason of the ultralow hydrogen and high toughness of the welding rod.
The welding rod coating mainly has the functions of gas making, slag making, deoxidation, alloy transition to a welding line and the like, and the main components of the coating are analyzed to play the following roles in the welding rod respectively:
the carbonate (including marble and barium carbonate) in the welding rod mainly has the functions of slagging and gas making, CaO series alkaline oxide generated by decomposition can improve the alkalinity of slag and refine molten drops, and has the functions of removing S, P, improving the crack resistance of weld metal and adjusting the melting point, viscosity, surface and section tension of the slag. The content of carbonate in the invention is controlled to be 16-38%;
the fluoride mainly comprises calcium fluoride, lanthanum fluoride and elpasolite, can adjust the melting point of slag, and plays a key role in reducing weld pores, improving the physical properties of molten slag, improving weld seam forming, removing slag and the like. The content of fluoride in the welding rod is 17-53%;
the rutile major constituent being TiO2The main functions of the arc stabilizer are arc stabilization and slag making, the melting point, viscosity, surface tension and fluidity of the slag can be adjusted, the weld forming is improved, and the splashing is reduced; the hot slag-removing property is good, so that the welding electric arc can be stabilized, the molten pool is calm, transition molten drops can be refined, metal can be transited in a fine mist shape, the directional weldability is good, the beautified weld formation is improved, the slag coverage is ensured, but the excessive use can cause the melting point of a coating to be higher, a deeper sleeve is formed, and the mechanical property is easy to reduce, so that the content of the coating is controlled to be 3-8%;
titanium dioxide can increase the plasticity of the coating of the welding rod and is a slag former, but the improvement process performance is inferior to that of rutile, and the content of the titanium dioxide is controlled to be 1-2.5%;
the main functions of metal powders such as manganese metal, ferrosilicon, ferrotitanium and the like are deoxidation and transition alloy, alloy element components in a welding seam are ensured, the welding seam strength is ensured, and the optimal obdurability matching is achieved through reasonable element design.
The binder adopts Li-Na mixed water glass added with moisture absorption resistant additive to match with alginate in welding flux, the water glass not only coats and binds welding rods, but also has the functions of slagging, slag state adjustment and arc stabilization, the alginate has stronger binding power and plasticity, and the coating property of the welding rods can be obviously improved by combining with the water glass, but because the alginate has high cost, the using amount of the alginate in the invention is controlled to be 0.5-1.5%.
The composition principle of the coating of the martensite heat-resistant steel welding rod for the ultra-supercritical thermal power generating unit is described above. The rest is iron and inevitable impurities. The alloying elements are mainly transited by the G115 homogeneous core wire. The welding rod has excellent pipeline all-position weldability, ultralow hydrogen and high toughness, the tensile strength of deposited metal is more than or equal to 720MPa, the diffused hydrogen H is less than 2, the normal-temperature impact average value KV2 is more than or equal to 100J, and the welding rod can be well matched with the base material performance of G115 steel.
The martensite heat-resistant steel welding rod for the ultra-supercritical thermal power generating unit has excellent all-position welding process performance of pipelines, strong and stable electric arc, moderate welding seam infiltration angle, excellent slag removal and attractive welding seam forming. The invention adopts novel CaCO by optimizing the components of the core wire3-CaF2-K3AlF6The pure alkali slag system and the optimized binder (Li-Na mixed water glass with moisture absorption resistant additive) realize the perfect combination of weldability and mechanicalness. The welding deposited metal component not only has excellent high-temperature strength and creep property, but also simultaneously has ultralow hydrogen and high toughness. The tensile strength of deposited metal is more than or equal to 720MPa, and the deposited metal has ultralow hydrogen and good low-temperature impact toughness, the diffused hydrogen H of the deposited metal is less than 2, the average value KV2 of normal-temperature impact power is more than or equal to 100J, the deposited metal can be well matched with the base material performance of G115 steel, and the deposited metal has a great breakthrough on the development of welding rods matched with the G115 steel.
Detailed Description
The technical solution of the present invention will be further described with reference to the following specific examples, but the present invention is not limited to these examples.
The martensite heat-resistant steel welding rod for the ultra-supercritical thermal power generating unit comprises a core wire and a coating, wherein the coating is coated on the outer wall of the core wire, the weight coefficient of the coating accounting for the total weight of the welding rod is 0.38-0.52, the total weight of the core wire is taken as a reference, and the core wire consists of the following components in percentage by weight: c: 0.08-0.10%; si: 0.25-0.45%; mn: 0.45-0.65%; p: less than or equal to 0.005 percent; s: less than or equal to 0.003 percent; ni: 0.30-0.62%; cr: 8.0-9.5%; co: 2.7-3.2%; w: co: 2.7-3.2%; v: 0.15-0.25%; nb: 0.02-0.04%; n: less than or equal to 0.01 percent; b: 0.008-0.012%; fe: and (4) the balance.
Based on the weight of the coating, the coating comprises the following components in percentage by weight:
marble (CaCO)3≥98％)：12～22％；
Barium carbonate (BaCO)3≥99％)：4～16％；
Calcium fluoride(CaF2≥98％)：6～18％；
Elpasolite (K)3AlF6≥99％)：8～20％；
Rutile (TiO)2≥95％)：3～8％；
Titanium dioxide (TiO)2≥99.5％)：1～2.5％；
Manganese metal (Mn is more than or equal to 99%): 2.5-4%;
silicon iron (Si: 40-48%, balance Fe): 2-5%;
ferrotitanium (Ti: 38-43%, balance Fe): 2-4%;
alginate (pure): 0.5 to 1.5 percent;
iron powder: and (4) the balance.
The deposited metal of the welding rod comprises the following components in percentage by weight: c: 0.07-0.12%; mn: 0.5-1.2%; si: less than or equal to 0.5 percent; p: less than or equal to 0.008 percent; s: less than or equal to 0.005 percent; ni: 0.28-0.52%; cr: 8.0-9.5%; co: 2.6-3.5%; w: co: 2.7-3.5%; v: 0.15-0.26%; nb: 0.02-0.06%; n: 0.005-0.025%; b: 0.006-0.018%; fe: and (4) the balance.
Examples 1 to 5
The invention is composed of a core wire and a coating, the coating is coated outside the core wire, a G115 homogeneous core wire is adopted, and the core wire comprises the following components (weight percentage):
table 1: weight percentage of core wire component (%)
Continuing with Table 1: weight percentage of core wire component (%)
The coating adopts CaCO3-CaF2-K3AlF6The pure alkaline slag system has a coating accounting for 0.38-0.52 of the total weight of the welding rod, and core wire diameters of 2.6mm, 3.2mm and 4.0 mm. The compositions of the coatings of examples 1-5 are as follows:
table 2: the components and the content (weight percentage%) of the coating
Continuing with Table 2: the components and the content (weight percentage%) of the coating
In the invention, the parameters of the Li-Na mixed water glass and the moisture-absorption-resistant additive which are automatically blended are the key points of moisture absorption resistance, ultralow hydrogen and high toughness of the welding rod.
The composition of the binder is as follows:
1) in a Li-Na mixed water glass, Li2O/Na2O is (1-1.5) to 10, the modulus is 2.90-3.30, and the concentration is 33-38 Be;
2) the moisture absorption resistant additive comprises the following components: calcium oxide: 10-38%; boric acid: 3-8%; alumina: 5-30%; quartz sand: 3-20%; zinc oxide: 5-15%; the particle sizes of the raw materials are all 8-20 mu m;
3) and (3) putting the moisture absorption resistant additive into Li-Na mixed water glass according to the proportion of 8-15%, fully stirring and uniformly mixing, and heating at 80 ℃ for 2h to obtain the welding rod binder.
The preparation method of the welding rod comprises the following steps:
1) uniformly mixing the components of the coating according to a proportion;
2) adding a binder which accounts for 20-30% of the total weight of the medicinal powder, stirring and mixing uniformly, and then uniformly coating the medicinal powder on the welding core by using an oil pressure type coating machine under the pressure of 12-15 Mpa;
3) the welding rod is baked at low temperature and high temperature, wherein the low-temperature baking temperature is 80-100 ℃ for 2 hours, and the high-temperature baking temperature is 350-400 ℃ for 1 hour.
Table 3: each embodiment deposited metal chemical composition (%)
Continuing with Table 3: each embodiment deposited metal chemical composition (%)
The test results of the deposited metal mechanical property, impact toughness and hydrogen diffusion of each embodiment are shown in the following table:
table 4: results of Performance testing of the examples
As can be seen from the above examples, the post-weld deposited metal of the present invention has characteristics of extremely low hydrogen (diffusible hydrogen H < 2) and high toughness, in addition to high strength and high durability similar to those of the base metal, which is a significant breakthrough for martensite structures with ultrahigh strength, particularly sensitive to hydrogen induced cracking and insufficient toughness. The tensile strength Rm of the deposited metal is more than or equal to 720Mpa under the heat treatment condition of 100 ℃ multiplied by 1h +780 ℃ multiplied by 3 h; the normal-temperature impact KV2 is more than or equal to 100J;
the embodiment of the welding rod adopts a G115 homogeneous core wire matched with a novel CaCO3-CaF2-K3AlF6 slag system and a Li-Na mixed water glass binder which is automatically blended and added with a moisture absorption resistant additive, and alloy elements are mainly transited by innovatively smelting the G115 core wire. Besides high strength and high durability similar to those of parent metal, the welded deposited metal also has the characteristics of extremely low hydrogen (H < 2) and high toughness (KV 2 is more than or equal to 100J at normal temperature and 20 ℃), which is a great breakthrough for martensite steel with ultrahigh strength, sensitivity to hydrogen induced cracking and insufficient toughness.
The above-described embodiments are only preferred embodiments of the present invention, and it should be noted that those skilled in the art can make various changes and modifications without departing from the inventive concept of the present invention, which falls into the protection scope of the present invention.
Claims (3)
1. The martensite heat-resistant steel welding rod for the ultra-supercritical thermal power generating unit comprises a core wire and a coating, wherein the coating is coated on the outer wall of the core wire, and the martensite heat-resistant steel welding rod is characterized in that the core wire adopts a G115 homogeneous core wire, and the coating accounts for 0.38-0.52 of the total weight coefficient of the welding rod;
(a) based on the total weight of the core wire, the core wire comprises the following components in percentage by weight: c: 0.08-0.10%; si: 0.25-0.45%; mn: 0.45-0.65%; p: less than or equal to 0.005 percent; s: less than or equal to 0.003 percent; ni: 0.30-0.62%; cr: 8.0-9.5%; co: 2.7-3.2%; w: 2.7-3.2%; v: 0.15-0.25%; nb: 0.02-0.04%; n: less than or equal to 0.01 percent; b: 0.008-0.012%; fe: the balance;
(b) the coating adopts CaCO3-CaF2-K3AlF6The slag system comprises the following components in percentage by weight based on the total weight of the welding flux: and (3) marble: 12-22%; barium carbonate: 4-16%; calcium fluoride: 6-18%; lanthanum fluoride: 3-15%; elpasolite: 8-20%; rutile: 3-8%; titanium dioxide: 1-2.5%; metal manganese: 2.5-4%; silicon iron: 2-5%; titanium iron: 2-4%; alginate: 0.5 to 1.5 percent; the balance of iron powder;
the binder of the welding rod adopts Li-Na mixed water glass with moisture absorption resistant additive;
the composition of the binder is as follows:
1) in a Li-Na mixed water glass, Li2O/Na2O ═ 1 to 1.5: 10, the modulus is 2.90-3.30, and the concentration is 33-38 Be;
2) the moisture absorption resistant additive comprises the following components: calcium oxide: 10-38%; boric acid: 3-8%; alumina: 5-30%; quartz sand: 3-20%; zinc oxide: 5-15%; the particle sizes of the raw materials are all 8-20 mu m;
3) and (3) putting the moisture absorption resistant additive into Li-Na mixed water glass according to the proportion of 8-15%, fully stirring and uniformly mixing, and heating at 80 ℃ for 2h to obtain the welding rod binder.
2. The martensitic heat-resistant steel welding electrode for ultra-supercritical thermal power generating unit according to claim 1, wherein the deposited metal of the martensitic heat-resistant steel welding electrode for ultra-supercritical thermal power generating unit comprises the following components in percentage by weight: c: 0.07-0.12%; mn: 0.5-1.2%; si: less than or equal to 0.5 percent; p: less than or equal to 0.008 percent; s: less than or equal to 0.005 percent; ni: 0.28-0.52%; cr: 8.0-9.5%; co: 2.6-3.5%; w: co: 2.7-3.5%; v: 0.15-0.26%; nb: 0.02-0.06%; n: 0.005-0.025%; b: 0.006-0.018%; fe: and (4) the balance.
3. The martensitic heat-resistant steel welding rod for the ultra-supercritical thermal power generating unit according to any one of claims 1 to 2, characterized in that the preparation of the welding rod comprises the following steps:
1) uniformly mixing the components of the coating according to a proportion;
2) adding a binder which accounts for 20-30% of the total weight of the medicinal powder, stirring and mixing uniformly, and then uniformly coating the medicinal powder on the welding core by using an oil pressure type coating machine under the pressure of 12-15 Mpa;
3) the welding rod is baked at low temperature and high temperature, wherein the low-temperature baking temperature is 80-100 ℃ for 2 hours, and the high-temperature baking temperature is 350-400 ℃ for 1 hour.
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| CN113579417A (en) * | 2021-07-24 | 2021-11-02 | 共享铸钢有限公司 | Defect welding and heat treatment method for heat-resistant steel casting |
| CN113857717B (en) * | 2021-10-27 | 2022-11-11 | 苏州思萃熔接技术研究所有限公司 | Heat-resistant steel hand welding rod for ultra-supercritical CB2 steel and preparation method thereof |
| CN113695785B (en) * | 2021-10-27 | 2021-12-28 | 苏州思萃熔接技术研究所有限公司 | Heat-resistant steel hand welding rod for ultra-supercritical T/P91 steel and production method thereof |
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| CH466006A (en) * | 1964-09-07 | 1968-11-30 | Elek Ska Svetsningsaktiebolage | Process for the production of a tubular welding wire or welding rod enclosing a core |
| US6939413B2 (en) * | 2003-03-24 | 2005-09-06 | Lincoln Global, Inc. | Flux binder system |
| US7147725B2 (en) * | 2003-12-04 | 2006-12-12 | Lincoln Global, Inc. | Colloidal silica binder system |
| US8624163B2 (en) * | 2005-06-01 | 2014-01-07 | Lincoln Global, Inc. | Modified flux system |
| CN106366946A (en) * | 2016-08-26 | 2017-02-01 | 北京斯霖垦科技有限公司 | Method for preparing lithium-containing sodium silicate adhesive |
| CN106346167B (en) * | 2016-09-14 | 2018-05-01 | 钢铁研究总院 | A kind of martensite heat-resistant steel welding welding rod |
| CN106984918B (en) * | 2017-05-15 | 2019-04-05 | 北京金威焊材有限公司 | The nickel-base welding rod ENiCrMo-3 of inverse proportion alkaline low-hydrogen type coating |
| CN110000490A (en) * | 2019-05-17 | 2019-07-12 | 中国电建集团上海能源装备有限公司 | A kind of T/P92 heat resistant steel electrode and preparation method thereof |
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