CN110773899A - Low-alloy steel electrode for welding SA-508Gr.3Cl.2 steel for nuclear reactor pressure vessel - Google Patents
Low-alloy steel electrode for welding SA-508Gr.3Cl.2 steel for nuclear reactor pressure vessel Download PDFInfo
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- CN110773899A CN110773899A CN201911005027.9A CN201911005027A CN110773899A CN 110773899 A CN110773899 A CN 110773899A CN 201911005027 A CN201911005027 A CN 201911005027A CN 110773899 A CN110773899 A CN 110773899A
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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
-
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention discloses a low alloy steel welding rod for welding SA-508Gr.3C1.2 steel for a nuclear reactor pressure vessel, which comprises a core wire and a coating for coating the core wire, wherein the core wire is a high-quality carbon steel core wire with low S, P content, and the coating comprises the following components in percentage by weight: 30-42% of marble powder, 12-24% of fluorite powder, 2-6% of rutile powder, 0.5-2% of potassium titanate, 22-32% of reduced iron powder, 3.5-6.5% of electrolytic manganese, 3.5-8% of spray ferrosilicon, 1.2-2.8% of nickel powder, 1.8-3.0% of ferromolybdenum, 0.15-0.35% of graphite, 0.4-0.8% of alginate, 0.4-0.8% of soda ash and 19-28% of binder, wherein the total amount of all the components except the binder is 100%. The formula proportion is reasonable, and the welding process has good welding process performance: stable electric arc, good fluidity of slag, easy slag removal and smooth welding seam formation.
Description
Technical Field
The invention relates to the field of welding materials, in particular to a low alloy steel welding rod for welding SA-508Gr.3Cl.2 steel for a nuclear reactor pressure vessel.
Background
The SA-508Gr.3Cl.2 steel is Mn-Mo-Ni low alloy steel for a nuclear reactor pressure vessel, and has moderate strength, good plasticity, excellent forgeability and weldability and low neutron irradiation sensitivity. The steel is widely applied to third-generation passive pressurized water reactor nuclear power equipment as steel for forging parts of pressure vessels, voltage stabilizers and evaporators of nuclear power stations.
At present, in the construction of domestic nuclear power stations, because SA-508Gr.3Cl.2 matched welding materials have high technical requirements and domestic welding materials cannot meet the technical indexes, imported welding materials are all adopted, the procurement period of the imported welding materials is long, the use cost is high, and a lot of inconvenience is brought to contact and communication with manufacturers of the imported welding materials, the mechanical properties of deposited metal in a heat treatment state of 595-620 ℃ x 2h and 24.5h cannot be guaranteed to be met by a conventional low-alloy steel welding rod E9018-G, the tensile strength of the deposited metal is obviously reduced along with the extension of heat treatment time, the strength of a welding seam is improved, and negative influence is generated on the toughness.
Disclosure of Invention
The invention aims to provide a low-alloy steel welding rod for welding SA-508Gr.3Cl.2 steel for a nuclear reactor pressure vessel, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a low alloy steel electrode for welding SA-508Gr.3Cl.2 steel for a nuclear reactor pressure vessel comprises a core wire and a coating for coating the core wire, wherein the core wire is a high-quality carbon steel core wire with low S, P content, and the coating comprises the following components in percentage by weight: 30-42% of marble powder, 12-24% of fluorite powder, 2-6% of rutile powder, 0.5-2% of potassium titanate, 22-32% of reduced iron powder, 3.5-6.5% of electrolytic manganese, 3.5-8% of spray ferrosilicon, 1.2-2.8% of nickel powder, 1.8-3.0% of ferromolybdenum, 0.15-0.35% of graphite, 0.4-0.8% of alginate, 0.4-0.8% of soda ash and 19-28% of binder, wherein the total amount of all the components except the binder is 100%.
Preferably, the content of CaCO3 in marble powder is more than or equal to 96 wt%, the content of CaF2 in fluorite powder is more than or equal to 96 wt%, the content of TiO2 in rutile powder is more than or equal to 92 wt%, the content of TiO2 in potassium titanate is more than or equal to 60 wt%, the content of K2O is more than or equal to 28.0 wt%, the content of Mn in electrolytic manganese is more than or equal to 99.5 wt%, the content of Si in spray ferrosilicon is 40-48 wt%, the content of Ni in nickel powder is more than or equal to 99.5 wt%, and the content of Mo in ferromoly.
Preferably, the binder is sodium potassium silicate, and the Baume concentration of the sodium potassium silicate is 41.5-43 degrees.
Preferably, the deposited metal after welding by the welding rod comprises the following chemical components in percentage by weight: c is less than or equal to 0.100 percent, Mn: 1.00-1.80%, Si: 0.15-0.60%, S is less than or equal to 0.010%, P is less than or equal to 0.010%, Cr is less than or equal to 0.15%, and Ni: 0.60 to 1.00%, Mo: 0.40-0.65%, V less than or equal to 0.04%, Cu less than or equal to 0.15%, and Fe and inevitable impurities.
Preferably, the weld deposit metal of the low alloy steel welding rod of SA-508Gr.3Cl.2 steel for welding the nuclear reactor pressure vessel has the following mechanical properties in a heat treatment state of 595-620 ℃ multiplied by 2h or in a heat treatment state of 595-620 ℃ multiplied by 24.5 h: the room temperature tensile strength Rm is 620-720 MPa, the room temperature RP0.2 is more than or equal to 450MPa, and the-25 ℃ KV is more than or equal to 40J.
A method of making a low alloy steel electrode for welding SA-508gr.3cl.2 steel for nuclear reactor pressure vessels comprising the steps of:
s1, uniformly mixing powder of each component in the coating according to a proportion;
s2, adding a sodium potassium silicate binder with Baume concentration of 41.5-43 degrees and accounting for 19-28 percent of the total weight of the components, and stirring and mixing uniformly;
s3, feeding the core wire into a layering machine, coating the core wire on the core wire by a conventional method, and baking the core wire at low temperature and high temperature;
s4, the weight of the coating in the welding rod is 35-45% of the total weight of the welding rod.
Preferably, the low-temperature baking temperature is 80-120 ℃, the baking time is 1.5-2h, the high-temperature baking temperature is 380-390 ℃, and the baking time is 1-2 h.
The main functions of the components in the raw materials of the coating are as follows:
marble powder: the main functions are slagging and gas making, electric arc stabilization, slag alkalinity improvement, slag removal performance improvement, better desulfurization capability and indirect dephosphorization effect, decomposition of C02 protects welding seams from being oxidized and nitrided, and hydrogen content in welding seam metal is reduced; the content of the marble in the coating is 30-42%.
Fluorite powder: the appropriate amount of fluorite can reduce the surface tension of liquid metal, improve the fluidity of the liquid metal, enable welding seams to be attractive in appearance, reduce welding seam air hole sensitivity and reduce the content of diffusible hydrogen of deposited metal, and the appropriate range of the content of the fluorite is 12-24%.
Rutile powder: the rutile has the main functions of stabilizing electric arc, slagging, adjusting physical properties of molten slag such as surface tension, viscosity, fluidity and the like, improving the slag removal performance, improving the weld forming, reducing splashing and the like; however, too much rutile tends to deteriorate the mechanical properties and crack resistance of the deposited metal, and therefore the rutile content in the coating is 2 to 6%.
Potassium titanate: the potassium titanate has the main functions of slagging, stabilizing electric arc and increasing the plasticity of the coating, and the content of the potassium titanate in the coating is 0.5-2%.
The invention adds potassium titanate based on the marble and fluorite matching with rutile, and combines the four according to a certain proportion, which can avoid over sacrificing the welding rod process performance while further improving the coating alkalinity, improve the plasticity, elasticity and fluidity of the coating in the welding rod press coating process, improve the press coating quality of the welding rod, and make the surface of the welding rod coating smooth without cracking.
Electrolytic manganese: the electrolytic manganese is added mainly to excess manganese element in the welding seam, so that the strength and plasticity of the welding seam metal are improved, and the effects of deoxidation and desulfurization and acceleration of welding reaction speed can be achieved; the content of electrolytic manganese in the coating is 3.5-6.5%.
Spraying ferrosilicon: the main function is deoxidation and alloying, and the content of the sprayed ferrosilicon in the coating is 3.5-8%.
Reduced iron powder: the reduced iron powder can effectively improve the deposition efficiency of the welding rod, is a necessary raw material for the high-efficiency iron powder type welding rod, and has the content of 22-32% in the coating.
Nickel powder: the nickel powder is mainly added as an alloying agent to improve the toughness of welding seams, and the addition amount of the nickel powder in the coating is 1.2-2.8%.
Ferromolybdenum: mainly used as an alloying agent to improve the heat strength of the welding seam. The addition amount of ferromolybdenum in the coating is 1.8-3.0%.
Graphite: the main functions are arc stabilization and pressure coating improvement, and the content of graphite in the coating is 0.15-0.35%.
The alginate and the soda ash are added to improve the press coating performance of the welding rod.
Compared with the prior art, the invention has the beneficial effects that:
1. the formula proportion is reasonable, and the welding process has good welding process performance: the electric arc is stable, the fluidity of the molten slag is good, the slag is easy to remove, and the welding seam is formed smoothly;
2. the welding rod has high purity of chemical components of deposited metal after welding, has stable and superior performance, and completely meets the requirements of national standard GB/T32533, American standard AWS A5.5/A5.5M and European standard ISO 18275;
3. the welding seam of the welding rod has excellent obdurability matching, in order to give consideration to welding process performance, deposited metal chemical components and mechanical properties, the high-alkalinity alkaline iron powder type slag coating is adopted to improve the purity of the welding seam, meanwhile, the alloy proportion is adjusted to meet the mechanical properties of the deposited metal, the proportion of each component in the coating is reasonably distributed, the welding process performance of the welding rod is ensured to be excellent, the mechanical properties of the deposited metal in a heat treatment state of 595-620 ℃ for 2h and 24.5h can be kept consistent, the chemical component range of the deposited metal is narrow, the content of C is less than or equal to 0.100 wt%, the content of Mn is 1.00-1.80 wt%, the content of Ni is 0.60-1.00 wt%, the content of Mo is 0.45-0.60 wt%, the slag fluidity is good during welding, electric arc stability, little splashing is generated, slag removal is good, the welding seam forming is attractive, the all-directional;
4. the welding rod can be used for welding SA-508Gr.3Cl.2 steel and also can be used for welding other low-alloy steel plates with the same strength and grade, the localization of the welding material is realized, the monopoly of imported welding materials can be broken, the purchasing period of the welding materials is shortened, the use cost of the welding materials is reduced, the economic benefit of welding material manufacturing enterprises can be improved, the popularity of the enterprise industry is improved, and the assistance can be provided for the development of the national nuclear power industry.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a low alloy steel electrode for welding SA-508Gr.3Cl.2 steel for a nuclear reactor pressure vessel comprises a core wire and a coating for coating the core wire, wherein the core wire is a high-quality carbon steel core wire with low S, P content, and the coating comprises the following components in percentage by weight: 30-42% of marble powder, 12-24% of fluorite powder, 2-6% of rutile powder, 0.5-2% of potassium titanate, 22-32% of reduced iron powder, 3.5-6.5% of electrolytic manganese, 3.5-8% of spray ferrosilicon, 1.2-2.8% of nickel powder, 1.8-3.0% of ferromolybdenum, 0.15-0.35% of graphite, 0.4-0.8% of alginate, 0.4-0.8% of soda ash and 19-28% of binder, wherein the total amount of all the components except the binder is 100%.
Furthermore, the content of CaCO3 in marble powder is more than or equal to 96 wt%, the content of CaF2 in fluorite powder is more than or equal to 96 wt%, the content of TiO2 in rutile powder is more than or equal to 92 wt%, the content of TiO2 in potassium titanate is more than or equal to 60 wt%, the content of K2O is more than or equal to 28.0 wt%, the content of Mn in electrolytic manganese is more than or equal to 99.5 wt%, the content of Si in spray ferrosilicon is 40-48 wt%, the content of Ni in nickel powder is more than or equal to 99.5 wt%, and the content of Mo in ferromolybd.
Furthermore, the binder is potassium-sodium water glass, and the Baume concentration of the binder is 41.5-43 degrees.
Further, the chemical components of the deposited metal after welding by the welding rod are respectively as follows by weight percent: c is less than or equal to 0.100 percent, Mn: 1.00-1.80%, Si: 0.15-0.60%, S is less than or equal to 0.010%, P is less than or equal to 0.010%, Cr is less than or equal to 0.15%, and Ni: 0.60 to 1.00%, Mo: 0.40-0.65%, V less than or equal to 0.04%, Cu less than or equal to 0.15%, and Fe and inevitable impurities.
Further, the weld deposit metal of the low alloy steel welding rod of SA-508Gr.3C1.2 steel for welding the nuclear reactor pressure vessel has the following mechanical properties in a heat treatment state of 595-620 ℃ multiplied by 2h or in a heat treatment state of 595-620 ℃ multiplied by 24.5 h: the room temperature tensile strength Rm is 620-720 MPa, the room temperature RP0.2 is more than or equal to 450MPa, and the-25 ℃ KV is more than or equal to 40J.
A method of making a low alloy steel electrode for welding SA-508gr.3cl.2 steel for nuclear reactor pressure vessels comprising the steps of:
s1, uniformly mixing powder of each component in the coating according to a proportion;
s2, adding a sodium potassium silicate binder with Baume concentration of 41.5-43 degrees and accounting for 19-28 percent of the total weight of the components, and stirring and mixing uniformly;
s3, feeding the core wire into a layering machine, coating the core wire on the core wire by a conventional method, and baking the core wire at low temperature and high temperature;
s4, the weight of the coating in the welding rod is 35-45% of the total weight of the welding rod.
Further, the low-temperature baking temperature is 80-120 ℃, the baking time is 1.5-2h, the high-temperature baking temperature is 380-390 ℃, and the baking time is 1-2 h.
In the following examples, a high-quality H08A carbon steel core wire with a diameter of 4.0mm is selected.
The specific chemical components are shown in table 1;
TABLE 1 comparison of specific chemical compositions (wt%) of core wire of the welding rod of this example
| C | S | Mn | Si | P | Cr | Ni | Cu | As |
| 0.061 | 0.006 | 0.47 | 0.02 | 0.007 | 0.01 | 0.01 | 0.01 | 0.003 |
The composition ratio of the coating of the welding rod of the embodiment is shown in Table 2;
TABLE 2 composition ratio (wt%) of coating of welding rod in example
The electrode of this example was prepared by pressing the electrode on a conventional oil pressure type electrode press coater, and the electrode was subjected to a welding test after drying at a low temperature of 100 ℃ and a high temperature of 380 ℃.
The chemical compositions of the deposited metal of the welding electrode are shown in Table 3;
table 3 shows the deposited metal chemical compositions (% by weight) of the electrodes of examples
Table 4 shows the mechanical properties of the deposited metal of the welding electrode of this example;
TABLE 4 mechanical Properties of deposited metals
The test results of the above examples show that the CHE628NM electrode of the present invention has good strength and low temperature toughness.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A low alloy steel electrode for welding SA-508Gr.3C1.2 steel for nuclear reactor pressure vessel, includes core wire and the coating of cladding core wire, its characterized in that: the welding core is high-quality carbon steel welding core with low S, P content, and the flux coating comprises the following components in percentage by weight: 30-42% of marble powder, 12-24% of fluorite powder, 2-6% of rutile powder, 0.5-2% of potassium titanate, 22-32% of reduced iron powder, 3.5-6.5% of electrolytic manganese, 3.5-8% of spray ferrosilicon, 1.2-2.8% of nickel powder, 1.8-3.0% of ferromolybdenum, 0.15-0.35% of graphite, 0.4-0.8% of alginate, 0.4-0.8% of soda ash and 19-28% of binder, wherein the total amount of all the components except the binder is 100%.
2. The low alloy steel electrode of claim 1 for welding SA-508gr.3c1.2 steel for a nuclear reactor pressure vessel, wherein: the content of CaCO3 in marble powder is more than or equal to 96 wt%, the content of CaF2 in fluorite powder is more than or equal to 96 wt%, the content of TiO2 in rutile powder is more than or equal to 92 wt%, the content of Ti02 in potassium titanate is more than or equal to 60 wt%, the content of K20 is more than or equal to 28.0 wt%, the content of Mn in electrolytic manganese is more than or equal to 99.5 wt%, the content of Si in spray ferrosilicon is 40-48 wt%, the content of Ni in nickel powder is more than or equal to 99.5 wt%, and the content of Mo in ferrom.
3. The low alloy steel electrode of claim 1 for welding SA-508gr.3c1.2 steel for a nuclear reactor pressure vessel, wherein: the binder is potassium-sodium water glass, and the Baume concentration of the binder is 41.5-43 degrees.
4. A low alloy steel electrode for welding SA-508gr.3cl.2 steel for nuclear reactor pressure vessels, according to any one of claims 1 to 3, wherein: the welding rod comprises the following chemical components in percentage by weight after welding: c is less than or equal to 0.100 percent, Mn: 1.00-1.80%, Si: 0.15-0.60%, S is less than or equal to 0.010%, P is less than or equal to 0.010%, Cr is less than or equal to 0.15%, and Ni: 0.60 to 1.00%, Mo: 0.40-0.65%, V less than or equal to 0.04%, Cu less than or equal to 0.15%, and Fe and inevitable impurities.
5. The low alloy steel electrode of claim 4 for welding SA-508Gr.3Cl.2 steel for nuclear reactor pressure vessels, wherein: the mechanical properties of the weld deposit metal of the low alloy steel welding rod of SA-508Gr.3Cl.2 steel for welding the nuclear reactor pressure vessel can reach the following levels under the heat treatment state of 595-620 ℃ multiplied by 2h or 595-620 ℃ multiplied by 24.5 h: the room temperature tensile strength Rm is 620-720 MPa, the room temperature RP0.2 is more than or equal to 450MPa, and the-25 ℃ KV is more than or equal to 40J.
6. A method for preparing a low-alloy steel electrode for welding SA-508gr.3cl.2 steel for nuclear reactor pressure vessels, according to any one of claims 1 to 3, characterized in that: the method comprises the following steps:
s1, uniformly mixing powder of each component in the coating according to a proportion;
s2, adding a sodium potassium silicate binder with Baume concentration of 41.5-43 degrees and accounting for 19-28 percent of the total weight of the components, and stirring and mixing uniformly;
s3, feeding the core wire into a layering machine, coating the core wire on the core wire by a conventional method, and baking the core wire at low temperature and high temperature;
s4, the weight of the coating in the welding rod is 35-45% of the total weight of the welding rod.
7. The method of making a low alloy steel electrode for welding SA-508Gr.3Cl.2 steel for a nuclear reactor pressure vessel, according to claim 6, wherein: the low-temperature baking temperature is 80-120 ℃, the baking time is 1.5-2h, the high-temperature baking temperature is 380-390 ℃, and the baking time is 1-2 h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112975195A (en) * | 2021-02-09 | 2021-06-18 | 天津市金桥焊材集团股份有限公司 | 600 MPa-level fire-resistant weather-resistant steel welding rod |
| CN115365701A (en) * | 2022-09-29 | 2022-11-22 | 中国科学院上海应用物理研究所 | Welding rod for welding molten salt corrosion resistant nickel-based high-temperature alloy |
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| SU1764914A1 (en) * | 1990-10-18 | 1992-09-30 | Научно-производственное объединение по технологии машиностроения | Welding electrode |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115365701A (en) * | 2022-09-29 | 2022-11-22 | 中国科学院上海应用物理研究所 | Welding rod for welding molten salt corrosion resistant nickel-based high-temperature alloy |
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