CN113579551B - 253MA heat-resistant stainless steel flux-cored wire and preparation method thereof - Google Patents
253MA heat-resistant stainless steel flux-cored wire 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
- 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
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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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- 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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
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Abstract
A253 MA heat-resistant stainless steel flux-cored wire and a preparation method thereof belong to the technical field of welding wires and are used for welding 253MA (S30815) stainless steel or stainless steel of the same grade. A common 304 stainless steel belt or 304L stainless steel belt is used as a coating layer, and the mass percentage of each alloy component in the powder core is as follows: 15-20% of natural rutile, 5-8% of quartz, 3-7% of zircon sand, 2-6% of high-temperature alumina, 2-4% of sodium fluoride, 2-4% of magnesia, 2-4% of iron sand, 0.5-1% of bismuth oxide, 17-25% of metal chromium powder, 8-15% of metal nickel powder, 2-4% of low-carbon ferromanganese, 5-10% of mixed rare earth, 6-12% of micro-carbon ferrochromium, 6-10% of mixed nitride powder, 0-2% of ferromolybdenum and the balance of reduced iron powder, wherein the percentage content of 0 or other percentage content is used for complementing 100%. The welding joint welded by the welding wire has excellent mechanical property, high temperature resistance and crack resistance.
Description
Technical Field
The invention belongs to the field of material processing engineering, and is mainly used for welding S30815 heat-resistant stainless steel and welding steel products of the same grade.
Background
S30815 stainless steel, also known as 253MA stainless steel (hereinafter collectively referred to as S30815 stainless steel), is a new type of austenitic heat resistant stainless steel developed in the middle and late 80 th 20 th century, and the trade name of this steel was first registered by european Avesta Sheffield AB. Manufacturers that developed 253MA heat resistant stainless steel earlier in the world also have Sandvik group Inc., Rolled Alloys (RA) Inc. in the United states, and so on. The Taiyuan iron and steel products Limited company in China can also produce the stainless steel since 2006. In 2001, ASME code number 253MA heat resistant stainless steel is S30815, UNS unified alloy number usa.
The S30815 stainless steel is a novel heat-resistant stainless steel formed by adding rare earth metal elements such as cerium and the like and adding nitrogen elements for micro-alloying on the basis of 304 type (18Cr-9Ni) austenitic stainless steel. As rare earth elements and nitrogen elements are added into the steel, the structure of the S30815 stainless steel is a pure austenite structure, and the S30815 stainless steel is added with high-content silicon elements, so that the use temperature of the steel is improved. The S30815 steel has the service temperature as high as 830-1100 ℃, and has good oxidation resistance, good high-temperature corrosion resistance and good high-temperature mechanical strength. The method has wide application in electric furnaces, sintering equipment, casting equipment, boilers and pressure vessels.
The Avesta corporation first developed a specialized electrode for welding S30815 steel, which was designated as 253MA electrode. Because the related standard of 253MA welding rod is not available at home and abroad, the name of Avesta company is still used by some manufacturers at home and abroad aiming at the welding electrode developed by S30815 steel welding, and the 253MA welding rod is also called as A102SiN welding rod by some manufacturers at home and abroad. At present, the domestic and foreign standards have no welding material standard corresponding to S30815 steel welding. For example, solid wires of 308SiN (or 253MA) have not been listed in GB/T29713-2013 stainless Steel welding wires and welding strips. No flux-cored wire of 308SiN (or 253MA) is listed in GB/T17853-2018 stainless steel flux-cored wire. In practical application, the welding material for welding S30815 steel is mainly 253MA welding rods, and reports and documents of 253MA flux-cored wires are not found.
The 253MA welding rod has the main problems of insufficient rare earth element content in the process of welding the S30815 stainless steel. At present, the content of rare earth elements in deposited metal of 253MA welding rods produced by Avesta company or 253MA welding rods produced by other companies is less than 0.01 percent due to the limitation of the characteristics of the welding rods, and the 253MA welding rods produced by some domestic and foreign manufacturers do not contain the rare earth elements in the deposited metal. Compared with 253MA heat-resistant stainless steel, the high-temperature mechanical properties of a welding joint, particularly the high-temperature oxidation resistance, the high-temperature creep strength and the high-temperature tensile strength of the welding joint are obviously lower than those of a parent metal due to the defect of rare earth elements in the deposited metal of the 253MA welding rod. During the operation of the welded structural member, cracks and other defects are generated from the welding line firstly, and finally the structural member fails. Secondly, when the silicon content and the chromium content in the deposited metal of the 253MA welding rod are high, if the ratio of the chromium equivalent to the nickel equivalent is not strictly controlled, the structure of the deposited metal becomes an austenite-ferrite dual-phase structure, so that the mechanical property of a welding joint of the deposited metal is poor under a high-temperature condition, and the service life of a welded part is greatly reduced. Thirdly, in order to prevent the welded joint from cracking, the 253MA welding rod produced by the mainstream manufacturers at present has a deposited metal structure of an austenite structure and a small amount of ferrite structure, and the content range of the ferrite structure is limited between 3 and 10 percent. These ferrite structures, which are present in small amounts, likewise deteriorate the high-temperature mechanical properties and the oxidation resistance of the welded joint at high temperatures. Fourthly, due to the limitation of welding rods, when 253MA welding rods are adopted, the problems of incapability of continuous welding, high labor intensity, low welding efficiency, serious waste and the like exist.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention develops a 253MA heat-resistant stainless steel flux-cored wire which can also be called as a 308SiN flux-cored wire.
A253 MA heat-resistant stainless steel flux-cored wire is characterized in that a common 304 stainless steel belt or 304L stainless steel belt is adopted as a coating layer, and the mass percentages of alloy components in a powder core are as follows: the mass percentage of the natural rutile is 15-20%, the mass percentage of the quartz is 5-8%, the mass percentage of the zircon sand is 3-7%, the mass percentage of the high-temperature alumina is 2-6%, the mass percentage of the sodium fluoride is 2-4%, the mass percentage of the magnesia is 2-4%, the mass percentage of the iron sand is 2-4%, the mass percentage of the bismuth oxide is 0.5-1%, the mass percentage of the metal chromium powder is 17-25%, the mass percentage of the metal nickel powder is 8-15%, the mass percentage of the low-carbon ferromanganese is 2-4%, the mass percentage of the mixed rare earth is 5-10%, the mass percentage of the micro-carbon ferrochrome is 6-12%, the mass percentage of the mixed nitride powder is 6-10%, the mass percentage of the molybdenum iron is 0-2%, and the balance is reduced iron powder (which can be 0 or other percentage, to make up 100%). All powders were 80 mesh in size.
The mixed rare earth is a mechanical mixture of rare earth ferrosilicon and cerium oxide. The content of rare earth ferrosilicon in the mixed rare earth is 90 percent by mass, and the content of cerium oxide in the mixed rare earth is 10 percent by mass.
The mixed nitride comprises chromium nitride iron powder, electrolytic metal manganese powder and aluminum nitride powder. The mixed nitride comprises the following components in percentage by mass: 85% of chromium nitride powder, 5% of electrolytic manganese metal and 10% of aluminum nitride.
The micro chromium ferrochrome comprises FeCr55C6 (55% of Cr, 0.06% of C) and the balance of impurities and Fe; the ferromolybdenum accounts for 60 wt% of molybdenum, and the balance of iron and impurities, namely ferromolybdenum containing 60% of molybdenum.
The width of the 304 or 304L stainless steel strip is 10mm, and the thickness range is 0.3-0.4 mm. The filling rate of the flux-cored wire is 24-28%. The diameter of the welding wire ranges from 1.0mm to 1.6 mm.
The welding current range of the welding wire is 90-300A, and the welding voltage range is 22-35V. When gas shielded welding is adopted, the welding shielding gas is 100 percent CO2Gas or 80% Ar + 20% CO2The flow of the gas is 10-25L/min.
The flux-cored wire manufactured by adopting 304 or 304L stainless steel bands comprises the following chemical components in percentage by mass:
c: 0.04-0.1%, Si: 1.4-2.0%, Mn: less than or equal to 1.0 percent, S less than or equal to 0.030, P less than or equal to 0.030, Cr: 20-23%, Ni: 9 to 11 percent of N, 0.08 to 0.2 percent of Mo, less than or equal to 0.75 percent of Re, 0.03 to 0.08 percent of Re and the balance of Fe.
The ferrite content of deposited metal of the flux-cored wire manufactured by adopting the 304 or 304L stainless steel strip is not more than 10 percent.
The flux-cored wire comprises the following components in parts by weight:
natural rutile: the slag former can stabilize electric arc and improve weld forming.
Quartz: the slag former increases the activity of slag.
Zircon sand: slag former, improving weld formation.
Alumina: the slag former improves the melting point of the slag.
Sodium fluoride: the physical and chemical properties of the slag are improved, the melting point of the slag is reduced, and gas in the welding seam is easy to separate out.
Magnesia: slagging agent, desulfurization and dephosphorization.
Iron sand: the slag former is used for diluting the molten slag and accelerating the welding speed.
Bismuth oxide: a slag former for improving slag detachability.
Metal chromium powder: the alloy has the functions of alloying and improving the hardness and the strength of a welding joint, and mainly has the functions of improving the oxidation resistance and the corrosion resistance of steel and ensuring higher mechanical properties of a welding line at room temperature and high temperature.
Metallic nickel powder: plays a role in alloying, stabilizes and promotes austenite forming elements, improves the stability of austenite, improves the high-temperature strength, creep resistance and high-temperature resistance of steel, and ensures that a welding seam has higher mechanical properties at room temperature and high temperature. Nickel can improve the strength and toughness of steel.
Low-carbon manganese-iron powder: manganese is an element stabilizing and promoting austenite formation, and can improve the strength of steel. Meanwhile, manganese has the functions of deoxidizing and fixing sulfur, and the manganese and the sulfur form MnS with high melting point, so that FeS can be prevented from being formed, and the hot brittleness of the steel can be prevented.
Mixing rare earth powder: deoxidizing during welding, increasing the metal fluidity of the molten pool, and improving the acid resistance and heat resistance of the steel. Improve the distribution and the form of oxide and sulfide inclusions in the welding seam, and improve the thermoplasticity and the high temperature resistance.
Micro-carbon ferrochrome powder: alloy infiltration and recarburization are carried out, and the high-temperature creep strength of the welding joint is improved.
Mixing nitride powder: nitriding and alloying promote the formation of austenite structure.
And (3) molybdenum iron powder: the crystal grains are refined, and the crack resistance of the welding seam is improved.
Reduced iron powder: and metal is transited to the welding seam, so that the conductivity is improved.
Advantageous effects
The invention develops a flux-cored wire for welding S30815 stainless steel, which can be used for welding S30815 heat-resistant stainless steel at high temperature.
Compared with 253MA welding rods (namely A102SiN welding rods), the automatic welding rod can be used for semi-automatic, automatic and robot welding, the production efficiency is higher, and the welding speed can reach 2-5 times of that of the welding rods. The invention is a disk-shaped welding wire, thus solving the problem that the A102SiN welding electrode wastes the head of the welding electrode after welding. In addition, in the welding process, the labor intensity of a welder is greatly reduced. The welding comprehensive cost of the S30815 stainless steel welded by the invention is reduced by about 1.2 times compared with the welding cost of the welding rod.
In order to prevent the occurrence of hot cracks in the welded joint, the 253 electrode (a102SiN electrode) generally has a ferrite structure in its deposited metal structure controlled to about 3 to 10%. When the welding material is used for welding the S30815 base metal, although the generation of hot cracks of a welding joint is avoided in the welding process, when the welding material is used in a high-temperature environment (600-. By adjusting the mass percentage of the alloying elements in the middle of the flux core, the deposited metal structure is a pure austenite structure or a ferrite structure with a small amount in the austenite structure, namely the ferrite content in the deposited metal structure can be controlled within the range of 0-10%. According to the invention, through strictly controlling the nitrogen content in the welding seam and adjusting the alloy components in the welding seam, the delta-ferrite phase precipitated along the grain boundary can be reduced, the sigma brittle phase precipitated along the grain boundary or in the crystal can be reduced, and the high-temperature performance of the welding joint can be improved.
Compared with 253MA welding rod without rare earth elements or trace rare earth elements, the invention strictly controls the mass percentage content of the mixed rare earth in the flux core, controls the content of the rare earth elements in deposited metal in a specific range, can change strip-shaped, needle-shaped or massive oxides and sulfides in a welding line into spherical oxides or sulfides, can refine crystal grains in the welding line, and greatly improves the high-temperature mechanical property of a welding joint.
Through the observation of a scanning electron microscope for the deposited metal structure of the 253MA welding rod at home and abroad, after the temperature of weld metal welded by the 253MA welding rod is higher than 850 ℃, Cr can be precipitated among crystals or in the crystals2Intermetallic formation of NThe compound greatly influences the service life of the welding joint under high temperature conditions. The invention can reduce Cr precipitation of welding joint under high temperature condition by adding self-made mixed nitride powder into the flux core and performing welding metallurgical reaction2The number of N intermetallic compounds further improves the service life of the welded joint.
The results of the comparison of the A102SiN welding rod and the crack resistance test of the invention show that even if the ferrite structure in the deposited metal of the welding wire is 0%, the crack resistance of the welding joint welded by the welding wire of the invention is not lower than that of the welding joint welded by the 253MA welding rod.
The specific implementation mode is as follows:
the welding wire is manufactured by adopting a conventional flux-cored wire production line. Firstly, rolling a steel strip into a U shape, adding prepared powder into a U-shaped groove, and then closing the U-shaped groove to wrap the powder therein.
The flux-cored wire is specifically selected for implementation. The welding parent metal is S30815 stainless steel. The welding groove and the welding seam sample are selected according to GB/T17854-1999 and GB 4334.5-90. The specific embodiment is as follows:
in example 1, a 304 stainless steel strip of 10X 0.3 (10 mm in width and 0.3mm in thickness) was used, and the filling rate was 28%. And drawing and reducing to obtain the welding wire with the diameter of 1.0 mm.
The powder core comprises the following alloy components in percentage by mass:
the mass percentage content of the rutile is 15 percent; the mass percentage of the quartz is 5 percent; the mass percentage of the zircon sand is 5 percent; the mass percentage of the alumina is 6 percent; the mass percentage of the sodium fluoride is 2 percent; the mass percentage of the magnesia is 3 percent; the mass percent of the iron sand is 2%. The mass percent of the bismuth oxide is 1 percent. The mass percent of the metal chromium powder is 17 percent; the mass percentage of the metal nickel powder is 8 percent; the mass percentage of the low-carbon ferromanganese is 3 percent; the mass percentage content of the mixed rare earth is 10 percent; the mass percentage of the micro-carbon ferrochrome is 12 percent; the mass percentage content of the mixed nitride is 10 percent; the weight percentage content of ferromolybdenum is 0 percent, and the balance is reduced iron powder.
The welding process parameters are as follows: welding currentThe welding voltage was 22V at 120A. The welding shielding gas is CO2The flow rate of the gas and the protective gas is 10L/min.
In example 2, a 304 stainless steel strip of 10X 0.4 (10 mm in width and 0.4mm in thickness) was used, and the filling rate was 26%. And drawing and reducing to obtain the welding wire with the diameter of 1.0 mm.
The powder core comprises the following alloy components in percentage by mass:
the mass percentage of the rutile is 18 percent; the mass percentage of the quartz is 7 percent; the mass percentage of the zircon sand is 3 percent; the mass percentage of the alumina is 3 percent; the mass percentage of the sodium fluoride is 4 percent; the mass percentage of the magnesia is 2 percent; the mass percent of the iron sand is 4%. The mass percentage of bismuth oxide is 0.8%. The mass percent of the metal chromium powder is 18 percent; the mass percentage of the metal nickel powder is 10 percent; the mass percentage of the low-carbon ferromanganese is 2 percent; the mass percentage content of the mixed rare earth is 8 percent; the mass percentage of the micro-carbon ferrochrome is 9 percent; the mass percentage content of the mixed nitride is 8 percent; the weight percentage content of ferromolybdenum is 2 percent, and the balance is reduced iron powder.
The welding process parameters are as follows: the welding current was 160A and the welding voltage was 24V. The welding protective gas is 80% Ar + 20% CO2The flow rate of the gas and the protective gas is 15L/min.
In example 3, a 304L stainless steel strip of 10X 0.4 (10 mm in width and 0.4mm in thickness) was used, and the filling rate was 25%. And drawing and reducing to obtain the welding wire with the diameter of 1.2 mm.
The powder core comprises the following alloy components in percentage by mass:
the mass percentage content of the rutile is 16 percent; the mass percentage of the quartz is 8 percent; the mass percentage content of the zircon sand is 3 percent; the mass percentage of the alumina is 4 percent; the mass percentage content of the sodium fluoride is 2 percent; the mass percentage of the magnesia is 4 percent; the mass percent of the iron sand is 2%. The mass percentage of bismuth oxide is 0.8%. The mass percent of the metal chromium powder is 20 percent; the mass percentage of the metal nickel powder is 11 percent; the mass percentage of the low-carbon ferromanganese is 3 percent; the mass percentage content of the mixed rare earth is 9 percent; the mass percentage of the micro-carbon ferrochrome is 8 percent; the mass percentage content of the mixed nitride is 8 percent; the weight percentage content of ferromolybdenum is 1 percent, and the balance is reduced iron powder.
The welding process parameters are as follows: the welding current was 240A and the welding voltage was 33V. The welding protective gas is 100% CO2The flow rate of the gas and the protective gas is 15L/min.
In example 4, a 304L stainless steel strip of 10X 0.4 (10 mm in width and 0.4mm in thickness) was used, and the filling rate was 25%. And drawing and reducing to obtain the welding wire with the diameter of 1.2 mm.
The powder core comprises the following alloy components in percentage by mass:
the mass percentage content of the rutile is 15 percent; the mass percentage of the quartz is 5 percent; the mass percentage of the zircon sand is 7 percent; the mass percentage of the alumina is 4 percent; the mass percentage content of the sodium fluoride is 3 percent; the mass percentage content of the magnesia is 2 percent; the mass percent of the iron sand is 3%. The mass percentage of bismuth oxide is 0.7%. The mass percent of the metal chromium powder is 21 percent; the mass percentage of the metal nickel powder is 12 percent; the mass percentage of the low-carbon ferromanganese is 3 percent; the mass percentage content of the mixed rare earth is 9 percent; the mass percentage of the micro-carbon ferrochrome is 7 percent; the mass percentage content of the mixed nitride is 7 percent; the weight percentage content of ferromolybdenum is 1 percent, and the balance is reduced iron powder.
The welding process parameters are as follows: the welding current was 220A and the welding voltage was 32V. The welding protective gas is 80% Ar + 20% CO2The flow rate of the gas and the protective gas is 15L/min.
In example 5, a 304L stainless steel strip of 10X 0.4 (10 mm in width and 0.4mm in thickness) was used, and the filling rate was 25%. And drawing and reducing to obtain the welding wire with the diameter of 1.6 mm.
The powder core comprises the following alloy components in percentage by mass:
the mass percentage content of the rutile is 16 percent; the mass percentage of the quartz is 6 percent; the mass percentage of the zircon sand is 5 percent; the mass percentage of the alumina is 2 percent; the mass percentage of the sodium fluoride is 2 percent; the mass percentage of the magnesia is 3 percent; the mass percent of the iron sand is 2%. The mass percentage of bismuth oxide is 0.5%. The mass percent of the metal chromium powder is 22 percent; the mass percentage of the metal nickel powder is 13 percent; the mass percentage of the low-carbon ferromanganese is 4 percent; the mass percentage content of the mixed rare earth is 6 percent; the mass percentage of the micro-carbon ferrochrome is 7 percent; the mass percentage content of the mixed nitride is 6 percent; the weight percentage content of ferromolybdenum is 2 percent, and the balance is reduced iron powder.
The welding process parameters are as follows: the welding current was 280A and the welding voltage was 36V. The welding protective gas is 100% CO2The flow rate of the gas and the protective gas is 15L/min.
In example 6, a 304L stainless steel strip of 10X 0.5 (10 mm in width and 0.5mm in thickness) was used and the filling rate was 24%. And drawing and reducing to obtain the welding wire with the diameter of 1.6 mm.
The powder core comprises the following alloy components in percentage by mass:
the mass percentage content of the rutile is 20 percent; the mass percentage of the quartz is 5 percent; the mass percentage of the zircon sand is 4 percent; the mass percentage of the alumina is 2 percent; the mass percentage content of the sodium fluoride is 3 percent; the mass percentage of the magnesia is 3 percent; the mass percent of the iron sand is 3%. The mass percentage of bismuth oxide is 0.5%. The mass percent of the metal chromium powder is 25 percent; the mass percentage content of the metallic nickel powder is 15 percent; the mass percentage of the low-carbon ferromanganese is 2 percent; the mass percentage content of the mixed rare earth is 5 percent; the mass percentage of the micro-carbon ferrochrome is 6 percent; the mass percentage content of the mixed nitride is 6 percent; the weight percentage content of ferromolybdenum is 0 percent, and the balance is reduced iron powder.
The welding process parameters are as follows: the welding current was 260A and the welding voltage was 34V. The welding protective gas is 100% CO2The flow rate of the gas and the protective gas is 15L/min.
Seventh, comparative example and invention comparative test results
A253 MA welding rod is used as a comparative example welding material, the diameter of the welding rod is 4mm, the welding current is 120A, and the welding voltage is 24V. And testing the chemical components and tensile strength of the deposited metal after welding. The chemical composition of deposited metal is tested according to GB/T17854-1999, and the mechanical property of a welding joint is tested according to GB 228-76. The deposited metal chemistry is shown in table 1. The weld mechanical property test results are shown in table 2. As can be seen from the above test results, no weld cracks were observed in the weld joints welded with the welding wire of the present invention and the comparative electrode. The tensile strength of the welding joints of the two is larger than 620MPa, and the use requirements of S30815 steel are met. The elongation of the welding wire is higher than that of the comparative welding wire, which shows that the welding joint welded by the welding wire has better plasticity. By comparing the creep strength of the welding joint of the two welding materials at 600 ℃ after 10000 hours, the welding joint welded by the welding wire has better high-temperature performance.
TABLE 1 chemical composition of deposited metals
TABLE 2 mechanical properties of welded joints of comparative examples and the welding wire of the present invention
Claims (9)
1. A253 MA heat-resistant stainless steel flux-cored wire is characterized in that a common 304 stainless steel belt or 304L stainless steel belt is adopted as a coating layer, and the mass percentages of alloy components in a powder core are as follows: the mass percentage of the natural rutile is 15-20%, the mass percentage of the quartz is 5-8%, the mass percentage of the zircon sand is 3-7%, the mass percentage of the high-temperature alumina is 2-6%, the mass percentage of the sodium fluoride is 2-4%, the mass percentage of the magnesia is 2-4%, the mass percentage of the iron sand is 2-4%, the mass percentage of the bismuth oxide is 0.5-1%, the mass percentage of the metal chromium powder is 17-25%, the mass percentage of the metal nickel powder is 8-15%, the mass percentage of the low-carbon ferromanganese is 2-4%, the mass percentage of the mixed rare earth is 5-10%, the mass percentage of the micro-carbon ferrochrome is 6-12%, the mass percentage of the mixed nitride powder is 6-10%, the mass percentage of the ferromolybdenum is 0-2%, and the balance is reduced iron powder, 0 or other percentage, to make up 100%.
2. The 253MA heat-resistant stainless steel flux-cored wire of claim 1, wherein the misch metal comprises a mechanical mixture of rare earth ferrosilicon and cerium oxide; the content of the rare earth ferrosilicon in the mixed rare earth is 90 percent by mass, and the content of the cerium oxide in the mixed rare earth is 10 percent by mass.
3. The 253MA heat-resistant stainless steel flux-cored wire of claim 1, wherein the mixed nitride powder comprises chromium iron nitride powder, electrolytic manganese metal powder and aluminum nitride powder; the mixed nitride comprises the following components in percentage by mass: 85% of chromium nitride powder, 5% of electrolytic manganese metal and 10% of aluminum nitride.
4. The 253MA heat resistant stainless steel flux cored welding wire of claim 1, wherein the micro carbon ferrochrome has a composition of FeCr55C6 (55% Cr, 0.06% C), and the balance of impurities and Fe; the ferromolybdenum accounts for 60 wt% of molybdenum, and the balance of iron and impurities, namely ferromolybdenum containing 60% of molybdenum.
5. The 253MA heat resistant stainless steel flux cored wire of claim 1, wherein the 304 or 304L stainless steel strip has a width of 10mm and a thickness in the range of 0.3-0.4 mm; the filling rate of the flux-cored wire is 24-28%, and the diameter range of the flux-cored wire is 1.0-1.6 mm.
6. The 253MA heat-resistant stainless steel flux-cored wire as claimed in claim 1, wherein the wire uses a welding current in a range of 90-300A, a welding voltage in a range of 22-35V; when gas shielded welding is adopted, the welding shielding gas is 100 percent CO2Gas or 80% Ar + 20% CO2The flow of the gas is 10-25L/min.
7. The 253MA heat-resistant stainless steel flux-cored wire of claim 1, wherein the flux-cored wire made of a 304 or 304L stainless steel strip comprises the following deposited metals in percentage by mass:
c: 0.04-0.1%, Si: 1.4-2.0%, Mn: less than or equal to 1.0 percent, less than or equal to 0.030 percent of S, less than or equal to 0.030 percent of P, and the weight ratio of Cr: 20-23%, Ni: 9 to 11 percent of N, 0.08 to 0.2 percent of Mo, less than or equal to 0.75 percent of Re, 0.03 to 0.08 percent of Re and the balance of Fe.
8. The 253MA heat-resistant stainless steel flux-cored wire of claim 1, wherein the ferrite content of the deposited metal is not more than 10%.
9. The use of the 253MA heat-resistant stainless steel flux-cored wire of claim 1, wherein the flux-cored wire is used for welding S30815 heat-resistant stainless steel and welding steel products of the same grade.
Priority Applications (1)
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