CN112404788A - Novel martensite heat-resistant steel G115 matched welding rod for power station and preparation method thereof - Google Patents
Novel martensite heat-resistant steel G115 matched welding rod for power station 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
- B23K35/02—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
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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
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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
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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
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- Nonmetallic Welding Materials (AREA)
Abstract
The invention belongs to the technical field of welding materials, and provides a novel martensite heat-resistant steel G115 matched welding rod for a power station and a preparation method thereof, wherein the welding rod comprises a core wire and a coating, and the coating comprises the following components in parts by weight: 30.0-40.0 parts of marble; 28.0-35.0 parts of fluorite; 5.0-8.0 parts of rutile; 3.0-4.5 parts of metal chromium; 4.0-8.0 parts of silicon micropowder; 3.5-6.0 parts of ferrosilicon; 0.5-0.9% of nickel powder; 0.5-0.8% of soda ash; 0.3-0.6 of CMC; 0.6-1.0 parts of sodium alginate; 1.2-1.4 of electrolytic manganese; 1.0-1.5 parts of tungsten powder; 1.8-2.6 of ferrotitanium powder; 0.9-1.3 parts of ferrovanadium powder; 0.3-0.6 parts of niobium-iron powder; 0.9-1.3 parts of ferrochromium nitride; 0.3-0.5 of ferroboron powder; 0.3-0.5% of amorphous graphite; 1.0-1.5 parts of cobalt powder. The welding rod can be suitable for welding G115 steel, and weld metal obtained by welding can completely meet the requirement of supercritical heat-resistant steel G115 on the welding performance.
Description
Technical Field
The invention relates to the technical field of welding rod preparation, in particular to a novel martensite heat-resistant steel G115 matched welding rod for a power station and a preparation method thereof.
Background
The basic research on the high-temperature structure stability of 650 ℃ martensite heat-resistant steel with 9% of Cr content is developed in China from 2009, the 'selective reinforcement design theory' of 650 ℃ martensite heat-resistant steel is provided, G115 original steel is successfully developed, and the 650 ℃ permanent strength of the original steel is superior to that of the same type of steel developed by Japanese scientific research institutes. Then, the industrial production of G115 steel thick-wall large-diameter pipes is developed, and the capacity of producing full-spectrum boiler pipes with the outer diameter of 19-1200mm and the wall thickness of 2-100mm is achieved. At present, China already masters smelting processes, hot working processes, cold working processes and heat treatment processes of various industrial smelting processes of G115 steel. With the increase of the market demand of the G115 steel, the first-line steel works in China can adopt the industrial process of the converter with more than 120 tons to smelt the G115 steel billets, the cost is greatly reduced, and a solid foundation is laid for the ultra-supercritical thermal power generating units to go abroad.
Experiments show that: the evolution trend of the permanent fracture time of the G115 steel pipe is stable, and the phenomenon that the permanent curve suddenly drops does not exist. The G115 steel pipe is a steel pipe which is developed so far and has the highest durability and steam corrosion resistance, and can be used for a large-caliber boiler pipe at 650 ℃. If G115 is adopted to replace the P92 steel tube which is used in the temperature range of 600-620 ℃, the wall thickness of the boiler tube can be greatly reduced, and the welding difficulty is greatly reduced. For both P92 steel pipe and G115 steel pipe with the same inside diameter, the G115 steel pipe has an outside diameter approximately corresponding to 78% of the P92 steel and a weight of approximately 47.4% of the P92 steel, i.e., approximately half the amount that it would be if both were to be used at a steam temperature of 650 ℃.
The welding material is an indispensable material in the equipment manufacturing process, and although G115 steel matched welding rods are available at present, the welding material has defects in deposited metal impact toughness and weldability.
Disclosure of Invention
The invention aims to provide a novel martensite heat-resistant steel G115 matched welding rod for a power station and a preparation method thereof, the welding rod can be suitable for welding G115 steel, and weld metal obtained by welding can completely meet the requirement of supercritical (super) critical heat-resistant steel G115 on the welding performance.
In order to achieve the purpose, the invention adopts the technical scheme that:
a novel martensite heat-resistant steel G115 matched welding rod for a power station comprises a core wire and a coating, wherein the coating comprises the following components in parts by weight: 30.0-40.0 parts of marble; 28.0-35.0 parts of fluorite; 5.0-8.0 parts of rutile; 3.0-4.5 parts of metal chromium; 4.0-8.0 parts of silicon micropowder; 3.5-6.0 parts of ferrosilicon; 0.5-0.9% of nickel powder; 0.5-0.8% of soda ash; 0.3-0.6 of CMC; 0.6-1.0 parts of sodium alginate; 1.2-1.4 of electrolytic manganese; 1.0-1.5 parts of tungsten powder; 1.8-2.6 of ferrotitanium powder; 0.9-1.3 parts of ferrovanadium powder; 0.3-0.6 parts of niobium-iron powder; 0.9-1.3 parts of ferrochromium nitride; 0.3-0.5 of ferroboron powder; 0.3-0.5% of amorphous graphite; 1.0-1.5 parts of cobalt powder.
The core wire comprises the following components in percentage by weight: 0.06-0.09% of C; 0.40-0.65% of Mn; si is less than or equal to 0.15 percent; s is less than or equal to 0.005 percent; p is less than or equal to 0.006 percent; 8.5-9.0% of Cr8; ni is less than or equal to 0.15 percent; 2.5-3.0% of Co; 2.5-3.0% of W; 0.6-0.8% of Cu; ti is less than or equal to 0.007 percent; al is less than or equal to 0.005 percent; as is less than or equal to 0.015 percent; pb is less than or equal to 0.015 percent; sn is less than or equal to 0.015 percent; sb is less than or equal to 0.015 percent; the balance being Fe.
As one of the preferable schemes, the coating comprises the following components in parts by weight: 36.0 parts of marble; 32.0 parts of fluorite; 7.0 parts of rutile; 3.3 of metallic chromium; 5.8 parts of silicon micropowder; 4.0 parts of ferrosilicon; 0.9 parts of nickel powder; 0.6 of sodium carbonate; CMC 0.6; 0.8 parts of sodium alginate; electrolytic manganese 1.3; 1.0 part of tungsten powder; 2.2 parts of ferrotitanium powder; 1.2 parts of ferrovanadium powder; 0.4 of niobium iron powder; 1.2 parts of ferrochromium nitride; 0.35 of ferroboron powder; amorphous graphite 0.35; 1.0 of cobalt powder.
As one of the preferable schemes, the coating comprises the following components in parts by weight: 39.0 parts of marble; fluorite 30.0; 6.0 parts of rutile; metallic chromium 4.0; 5.5 of silicon micropowder; 4.0 parts of ferrosilicon; 0.7 parts of nickel powder; 0.6 of sodium carbonate; CMC 0.4; 0.8 parts of sodium alginate; electrolytic manganese 1.4; 1.0 part of tungsten powder; 2.2 parts of ferrotitanium powder; 1.2 parts of ferrovanadium powder; 0.4 of niobium iron powder; 1.0 parts of ferrochromium nitride; 0.4 of boron iron powder; 0.4 of amorphous graphite; 1.0 of cobalt powder.
As one of the preferable schemes, the coating comprises the following components in parts by weight: 32.0 parts of marble; 33.3 parts of fluorite; 7.0 parts of rutile; 4.5 of metallic chromium; 6.5 parts of silicon micropowder; 4.0 parts of ferrosilicon; 0.6 parts of nickel powder; 0.6 of sodium carbonate; CMC 0.4; 0.8 parts of sodium alginate; electrolytic manganese 1.4; 1.5 parts of tungsten powder; 2.6 parts of ferrotitanium powder; 1.2 parts of ferrovanadium powder; 0.4 of niobium iron powder; 1.0 parts of ferrochromium nitride; 0.4 of boron iron powder; 0.4 of amorphous graphite; 1.4 of cobalt powder.
In the present application, the mass ratio of the sheath to the core wire is preferably 3: 7.
The application also provides a preparation method of the novel martensite heat-resistant steel G115 matched welding rod for the power station, which comprises the following steps: (a) uniformly mixing the components of the coating according to a ratio, adding an adhesive into the mixture, and uniformly mixing; (b) and (b) adding the mixture prepared in the step (a) and the core wire into a plodder, preparing a coating on the surface of the core wire, and baking at low temperature and high temperature to obtain the welding rod.
Preferably, in step (a), the weight ratio of binder to mixture is 0.21-0.23: 1; in the step (b), the low-temperature baking temperature is 85-110 ℃, and the high-temperature baking temperature is 380 ℃; the adhesive is potassium sodium silicate, and the modulus ratio of the potassium sodium silicate is 1: 1.
The design of the welding rod formula of the invention comprises the following principles:
CaCO3is the main component of marble, and the marble used in the welding rod is decomposed into CaO and CO under the action of arc heat2The gas plays roles of slagging and gas making; CaO is an alkaline oxide, can improve the alkalinity of the slag, stabilize electric arc, increase the interfacial tension and the surface tension of the slag and the metal surface, improve the slag removal performance, and has better S removal capacity and CO removal capacity2The hydrogen partial pressure in the arc atmosphere can be reduced, and the hydrogen content of the welding seam can be reduced. CaCO3Too much (more than 40.0%) coarsening of molten droplets, CaCO3Too little, CaO and CO produced2The gas is not enough, slagging and gas making which cannot be fine are carried out, the performance of the welding seam is influenced, and the content of the marble is controlled to be 30.0-40.0%.
CaF2Is the main component of fluorite, is a mineral substance with multiple causes, belongs to alkaline fluoride, is a slag former and a diluent in the welding rod and can play a role in dehydrogenation; CaF2F is ionized under the action of welding arc-The partial pressure of hydrogen in the arc atmosphere can be reduced, and the effect is the same as that of carbonate; CaF2The decomposition of (2) can reduce the oxygen content in the deposited metal, and is beneficial to improving the low-temperature impact toughness of the weld metal; CaF2The melting point is lower, the high-temperature viscosity of the slag can be effectively reduced, the fluidity of the slag is improved, the conductivity is improved, the formation of a welding seam is improved, and the high-temperature-resistant. Rational CaF2The content can stabilize the arc if CaF2If the temperature is too high, the arc stability is deteriorated and the slag becomes hard. The present application shall CaF2The content of the (B) is controlled between 28.0 and 35.0 percent,the welding performance is better.
Rutile is relatively pure titanium dioxide, TiO2The acid oxide can improve the physical property of slag, change long slag into short slag, lead the change of slag along with temperature to be rapid, lead the weld joint to be well formed, improve the slag detachability, and lead the total amount to be controlled between 5.0 and 8.0 percent when in addition.
Cr is easily formed into Cr during welding2O3The oxide film enables the weld metal to have excellent normal temperature and high temperature oxidation resistance and improves the corrosion resistance; and Cr may also form M23C6The carbide has better carbide strengthening effect in the matrix and solid solution strengthening effect. However, Cr is harmful to toughness in the as-welded state, has lower toughness after heat treatment, and is not suitable to be added in too much. According to the invention, a Cr, W and Co alloy combined strengthening mode is adopted, the Cr addition amount is controlled to be 3.0-4.5%, the strength is effectively improved while good toughness is ensured, good mechanical properties are obtained, and the obtained weld metal has the advantages of oxidation resistance, corrosion resistance, good toughness and the like.
The addition of Ni is beneficial to improving the impact toughness of the welding seam, but can reduce AC of deposited metal1And AC3Point; also, Ni has much less effect on strength than Mn, and effective strengthening of Ni is much less than that of Mo or Cr. Therefore, the invention reasonably adjusts the contents of Cr, Mn and Ni, controls the Ni to be 0.5-1.6%, and effectively ensures the mechanical property of the welding seam.
Mn and Si are added as deoxidizers. In addition to the deoxidation effect, the weld strength is improved along with the increase of Mn, and the higher the impact absorption work after strain aging treatment is, the weld yield strength and tensile strength are improved by about 10MPa for every 0.1 percent increase of Mn. The deoxidizing capacity of Si is 3.8-4.0 times of that of Mn, when Si and Cr exist at the same time, the high-temperature oxidation resistance of the alloy can be improved, but the high content of Si is not beneficial to the toughness of weld metal, the content of Cr, Si and Mn is reasonably adjusted, the content of Si-Fe is controlled to be 3.5-6.0%, and the content of electrolytic manganese is controlled to be 1.3-1.8%.
W, Co mainly plays a role of solid solution strengthening and also participates in precipitation strengthening, and can improve the high-temperature strength of steel. Besides the solid solution strengthening effect, Co also delays the recovery of martensite during high-temperature tempering, promotes the nucleation of fine carbides during tempering, and slows down the curing and growth of the carbides, thereby improving the creep strength. However, too high W and Co can reduce the impact toughness of the welding seam, so the invention combines the adjustment of Cr content to control W powder at 0.8-1.5% and Co powder at 1.0-1.5%.
The ferrotitanium powder mainly plays a role in deoxidation and heat resistance improvement. Because Ti and a strong carbide forming element can form stable carbide TiC in steel, but the stable carbide TiC is not combined with other alloy elements to form composite carbide generally, and the heat strength and the heat resistance are improved; however, the impact toughness of the welding seam is reduced due to over high Ti, so that the titanium iron powder is controlled to be 1.8-2.6 percent.
The addition of B can improve the heat resistance and creep strength of the steel. The B atoms in the crystal play a role of solid solution strengthening, and the B atoms distributed in the crystal boundary obviously strengthen the metal crystal boundary. B into M23C6Carbide and is biased to M23C6Interface with substrate to prevent M23C6While promoting VN nucleation to improve creep strength. In the invention, the content of the ferroboron powder is controlled to be 0.3-0.5%.
In conclusion, the components of the coating are reasonably arranged, and the proportion of the components is set according to the interrelation of the components, so that the welding rod formed by matching the finally formed coating and the welding core can completely meet the requirement of the supercritical heat-resistant steel G115 on the welding performance.
The invention has the beneficial effects that:
the welding rod of the invention is used for welding the ultra (supercritical) heat-resistant steel G115, the tensile strength of the weld metal is more than or equal to 620Mpa, the yield strength is more than or equal to 530Mpa, the elongation is more than or equal to 17 percent, and the 20 ℃ impact energy KV2Not less than 47J, and weld seam blowholes, slag inclusion, cracks, diffused hydrogen, appearance edges and the like after welding completely meet the requirements of the supercritical heat-resistant steel G115 on the weld seam performance.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the present invention is further described with reference to specific embodiments below.
Example 1
The coating comprises the following components in parts by weight: 36.0 parts of marble; 32.0 parts of fluorite; 7.0 parts of rutile; 3.3 of metallic chromium; 5.8 parts of silicon micropowder; 4.0 parts of ferrosilicon; 0.9 parts of nickel powder; 0.6 of sodium carbonate; CMC 0.6; 0.8 parts of sodium alginate; electrolytic manganese 1.3; 1.0 part of tungsten powder; 2.2 parts of ferrotitanium powder; 1.2 parts of ferrovanadium powder; 0.4 of niobium iron powder; 1.2 parts of ferrochromium nitride; 0.35 of ferroboron powder; amorphous graphite 0.35; 1.0 of cobalt powder.
The core wire comprises the following components in percentage by weight:
0.08 percent of C; 0.50 percent of Mn; 0.13 percent of Si; 0.004 percent of S; 0.006 percent of P; 9.0 percent of Cr; 0.15 percent of Ni; 2.8 percent of Co; 2.8 percent of W; 0.7 percent of Cu; 0.007 percent of Ti; 0.005% of Al; 0.015 percent of As; 0.015 percent of Pb; 0.015 percent of Sn; 0.015 percent of Sb; the balance being Fe.
The ingredients of the coating are mixed evenly, binder (potassium sodium water glass with the modulus ratio of 1: 1) with the weight of 23 percent of the weight of the coating is added and stirred evenly to prepare paste for the coating, then the paste is sent into a layering machine to be wrapped on a welding core, and then the welding rod product of the embodiment is formed after low-temperature baking at 110 ℃ and high-temperature baking at 380 ℃. The mass ratio of the coating to the core wire is 3: 7.
The welding rod of the embodiment has the advantages of stable electric arc, less splashing, good slag detachability, good all-position operability, attractive weld forming, extremely low S, P impurity content, excellent impact toughness after heat treatment of deposited metal at 770 ℃ for 6 hours, low diffusible hydrogen content and excellent crack resistance, and the mechanical properties of the deposited metal are as follows: rm＝725Mpa，Rp0.2＝592Mpa，A＝21％，(20℃)KV275J, moderate strength and plasticity.
Example 2
The coating comprises the following components in parts by weight: 39.0 parts of marble; fluorite 30.0; 6.0 parts of rutile; metallic chromium 4.0; 5.5 of silicon micropowder; 4.0 parts of ferrosilicon; 0.7 parts of nickel powder; 0.6 of sodium carbonate; CMC 0.4; 0.8 parts of sodium alginate; electrolytic manganese 1.4; 1.0 part of tungsten powder; 2.2 parts of ferrotitanium powder; 1.2 parts of ferrovanadium powder; 0.4 of niobium iron powder; 1.0 parts of ferrochromium nitride; 0.4 of boron iron powder; 0.4 of amorphous graphite; 1.0 of cobalt powder.
Core wire same as example 1
The ingredients of the coating are uniformly mixed, then a binder (potassium sodium water glass with the modulus ratio of 1: 1) with the weight of 21 percent of the weight of the coating is added and uniformly stirred to prepare a paste for the coating, and then the paste is sent into a layering machine to be coated on a welding core and then baked at low temperature of 85 ℃ and high temperature of 380 ℃ to form the welding rod product of the embodiment. The mass ratio of the coating to the core wire is 3: 7.
The welding rod of the embodiment has the advantages of stable electric arc, less splashing, good slag detachability, good all-position operability, attractive weld forming, extremely low S, P impurity content, excellent impact toughness after heat treatment of deposited metal at 770 ℃ for 6 hours, low diffusible hydrogen content and excellent crack resistance, and the mechanical properties of the deposited metal are as follows: rm＝736Mpa，Rp0.2＝605Mpa，A＝22％，(20℃)KV278J, moderate strength and plasticity.
Example 3
The coating comprises the following components in parts by weight: 32.0 parts of marble; 33.3 parts of fluorite; 7.0 parts of rutile; 4.5 of metallic chromium; 6.5 parts of silicon micropowder; 4.0 parts of ferrosilicon; 0.6 parts of nickel powder; 0.6 of sodium carbonate; CMC 0.4; 0.8 parts of sodium alginate; electrolytic manganese 1.4; 1.5 parts of tungsten powder; 2.6 parts of ferrotitanium powder; 1.2 parts of ferrovanadium powder; 0.4 of niobium iron powder; 1.0 parts of ferrochromium nitride; 0.4 of boron iron powder; 0.4 of amorphous graphite; 1.4 of cobalt powder.
Core wire same as example 1
The ingredients of the coating are mixed evenly, then binder (potassium sodium water glass with the modulus ratio of 1: 1) with the weight of 22 percent of the weight of the coating is added and stirred evenly to prepare paste for the coating, then the paste is sent into a layering machine to be wrapped on a welding core, and then the welding rod product of the embodiment is formed after low temperature baking at 100 ℃ and high temperature baking at 380 ℃. The mass ratio of the coating to the core wire is 3: 7.
The welding rod of the embodiment has the advantages of stable electric arc, less splashing, good slag detachability, good all-position operability, attractive weld forming, extremely low S, P impurity content, excellent impact toughness after heat treatment of deposited metal at 770 ℃ for 6 hours, low diffusible hydrogen content and excellent crack resistance, and the mechanical properties of the deposited metal are as follows: rm＝757Mpa，Rp0.2＝621Mpa，A＝21％，(20℃)KV270J, moderate strength and plasticity.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. 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 (10)
1. The utility model provides a power station is with supporting welding rod of novel martensite heat-resistant steel G115, includes core wire and coating, its characterized in that, the coating includes the component of following part by weight:
30.0-40.0 parts of marble; 28.0-35.0 parts of fluorite; 5.0-8.0 parts of rutile; 3.0-4.5 parts of metal chromium; 4.0-8.0 parts of silicon micropowder; 3.5-6.0 parts of ferrosilicon; 0.5-0.9% of nickel powder; 0.5-0.8% of soda ash; 0.3-0.6 of CMC; 0.6-1.0 parts of sodium alginate; 1.2-1.4 of electrolytic manganese; 1.0-1.5 parts of tungsten powder; 1.8-2.6 of ferrotitanium powder; 0.9-1.3 parts of ferrovanadium powder; 0.3-0.6 parts of niobium-iron powder; 0.9-1.3 parts of ferrochromium nitride; 0.3-0.5 of ferroboron powder; 0.3-0.5% of amorphous graphite; 1.0-1.5 parts of cobalt powder.
2. The novel martensitic heat-resistant steel G115 mating electrode for power stations as claimed in claim 1, wherein said core wire comprises the following components by weight percent:
0.06-0.09% of C; 0.40-0.65% of Mn; si is less than or equal to 0.15 percent; s is less than or equal to 0.005 percent; p is less than or equal to 0.006 percent; 8.5-9.0% of Cr8; ni is less than or equal to 0.15 percent; 2.5-3.0% of Co; 2.5-3.0% of W; 0.6-0.8% of Cu; ti is less than or equal to 0.007 percent; al is less than or equal to 0.005 percent; as is less than or equal to 0.015 percent; pb is less than or equal to 0.015 percent; sn is less than or equal to 0.015 percent; sb is less than or equal to 0.015 percent; the balance being Fe.
3. The novel martensitic heat-resistant steel G115 mating welding rod for the power station as claimed in claim 1 or 2, wherein the coating comprises the following components in parts by weight:
36.0 parts of marble; 32.0 parts of fluorite; 7.0 parts of rutile; 3.3 of metallic chromium; 5.8 parts of silicon micropowder; 4.0 parts of ferrosilicon; 0.9 parts of nickel powder; 0.6 of sodium carbonate; CMC 0.6; 0.8 parts of sodium alginate; electrolytic manganese 1.3; 1.0 part of tungsten powder; 2.2 parts of ferrotitanium powder; 1.2 parts of ferrovanadium powder; 0.4 of niobium iron powder; 1.2 parts of ferrochromium nitride; 0.35 of ferroboron powder; amorphous graphite 0.35; 1.0 of cobalt powder.
4. The novel martensitic heat-resistant steel G115 mating welding rod for the power station as claimed in claim 1 or 2, wherein the coating comprises the following components in parts by weight:
39.0 parts of marble; fluorite 30.0; 6.0 parts of rutile; metallic chromium 4.0; 5.5 of silicon micropowder; 4.0 parts of ferrosilicon; 0.7 parts of nickel powder; 0.6 of sodium carbonate; CMC 0.4; 0.8 parts of sodium alginate; electrolytic manganese 1.4; 1.0 part of tungsten powder; 2.2 parts of ferrotitanium powder; 1.2 parts of ferrovanadium powder; 0.4 of niobium iron powder; 1.0 parts of ferrochromium nitride; 0.4 of boron iron powder; 0.4 of amorphous graphite; 1.0 of cobalt powder.
5. The novel martensitic heat-resistant steel G115 mating welding rod for the power station as claimed in claim 1 or 2, wherein the coating comprises the following components in parts by weight:
32.0 parts of marble; 33.3 parts of fluorite; 7.0 parts of rutile; 4.5 of metallic chromium; 6.5 parts of silicon micropowder; 4.0 parts of ferrosilicon; 0.6 parts of nickel powder; 0.6 of sodium carbonate; CMC 0.4; 0.8 parts of sodium alginate; electrolytic manganese 1.4; 1.5 parts of tungsten powder; 2.6 parts of ferrotitanium powder; 1.2 parts of ferrovanadium powder; 0.4 of niobium iron powder; 1.0 parts of ferrochromium nitride; 0.4 of boron iron powder; 0.4 of amorphous graphite; 1.4 of cobalt powder.
6. The novel martensitic heat-resistant steel G115 mating electrode for power stations as claimed in claim 1 or 2, characterized in that the mass ratio of said flux coating to said core wire is 3: 7.
7. The preparation method of the welding rod matched with the novel martensite heat-resistant steel G115 for the power station as claimed in any claim 1 to 6, is characterized by comprising the following steps:
(a) uniformly mixing the components of the coating according to a ratio, adding an adhesive into the mixture, and uniformly mixing;
(b) and (b) adding the mixture prepared in the step (a) and the core wire into a plodder, preparing a coating on the surface of the core wire, and baking at low temperature and high temperature to obtain the welding rod.
8. The method for preparing the novel martensitic heat-resistant steel G115 mating electrode for power stations as claimed in claim 7, wherein in step (a), the weight ratio of the binder to the mixture is 0.21-0.23: 1.
9. The method for preparing the novel martensitic heat-resistant steel G115 mating electrode for the power station as claimed in claim 7, wherein in the step (b), the low-temperature baking temperature is 85-110 ℃, and the high-temperature baking temperature is 380 ℃.
10. The method for preparing the novel martensitic heat-resistant steel G115 mating welding rod for the power station as claimed in claim 7, wherein the binder is potassium sodium silicate, and the modulus ratio of the potassium sodium silicate is 1: 1.
Priority Applications (1)
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113695785A (en) * | 2021-10-27 | 2021-11-26 | 苏州思萃熔接技术研究所有限公司 | Novel slag system heat-resistant steel hand welding rod for ultra-supercritical T/P91 steel and production method thereof |
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| CN113695785A (en) * | 2021-10-27 | 2021-11-26 | 苏州思萃熔接技术研究所有限公司 | Novel slag system heat-resistant steel hand welding rod for ultra-supercritical T/P91 steel and production method thereof |
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