CN112404793B - Seamless flux-cored wire for welding low-nitrogen non-magnetic naval vessel steel - Google Patents

Seamless flux-cored wire for welding low-nitrogen non-magnetic naval vessel steel Download PDF

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CN112404793B
CN112404793B CN202011068329.3A CN202011068329A CN112404793B CN 112404793 B CN112404793 B CN 112404793B CN 202011068329 A CN202011068329 A CN 202011068329A CN 112404793 B CN112404793 B CN 112404793B
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welding
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CN112404793A (en
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王红鸿
孟庆润
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Wuhan University of Science and Engineering WUSE
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Wuhan University of Science and Engineering WUSE
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B23K35/308—Fe as the principal constituent with Cr as next major constituent
    • B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires
    • B23K35/0266—Rods, electrodes, wires flux-cored
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—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
    • B23K35/3607—Silica or silicates
    • 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
    • B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40—Making wire or rods for soldering or welding
    • B23K35/406—Filled tubular wire or rods

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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 relates to a seamless flux-cored wire for welding low-nitrogen non-magnetic naval vessel steel. The technical scheme is as follows: the seamless flux-cored wire for welding the low-nitrogen nonmagnetic naval vessel steel is characterized in that 20-25 wt% of flux-cored powder is filled in 75-80 wt% of stainless steel strips. The stainless steel strip comprises the following chemical components in percentage by weight: 0.03-0.08 wt% of C, less than or equal to 1 wt% of Si, less than or equal to 2 wt% of Mn, 18-20 wt% of Cr, 8-11 wt% of Ni, less than or equal to 0.03 wt% of S, less than or equal to 0.03 wt% of P, and the balance of Fe and inevitable impurities; the chemical components and contents of the medicine core powder are as follows: 28-32 wt% of rutile, 2-4 wt% of quartz sand, 2-4 wt% of sodium potassium titanate, 2-5 wt% of silicon powder, 10-14 wt% of manganese powder, 2-6 wt% of manganese nitride, 20-25 wt% of nickel powder, 8-10 wt% of chromium powder and the balance of iron powder. The weld formed by welding the low-nitrogen non-magnetic naval vessel steel has high metal strength, good ductility and toughness, and excellent non-magnetic property and seawater corrosion resistance, and can meet the technical requirements of a new generation of naval vessels.

Description

Seamless flux-cored wire for welding low-nitrogen non-magnetic naval vessel steel
Technical Field
The invention belongs to the technical field of seamless flux-cored wires. In particular to a seamless flux-cored wire for welding low-nitrogen non-magnetic naval vessel steel.
Background
917 nonmagnetic steel is Mn-Al component nonmagnetic steel developed in 60-70 s of China, is mainly used for ship construction, has high carbon content and alloy components, and belongs to medium carbon steel with a completely nonmagnetic single-phase austenite structure. With the gradual development of ships to large drainage, large tonnage and deep sea, new requirements on the strength and corrosion resistance of steel for ship structures are also put forward. 917 steel has good comprehensive performance, can meet the design and use requirements of various naval vessels, but has a low actual control value of yield strength, which is within the range of 300-450 MPa; belongs to medium carbon steel, and has relatively poor seawater corrosion resistance.
In order to meet the requirements of naval vessel development, a novel low-nitrogen non-magnetic naval vessel steel with high strength and good seawater corrosion resistance is successfully developed, and the chemical composition system is as follows: the 0Cr22Ni15Mn6Mo3N (hereinafter referred to as low-nitrogen non-magnetic naval vessel steel) adopts low nitrogen content (mass fraction is 0.25-0.35) and adopts the mechanisms of solid solution strengthening, precipitation strengthening and fine grain strengthening and toughening to ensure that the steel has high strength, high ductility and toughness, no magnetism and good seawater corrosion resistance. In addition, the addition of nitrogen also enables the steel to have more excellent corrosion resistance. The novel low-nitrogen non-magnetic naval vessel steel is positioned in super austenitic stainless steel with high Ni content, can meet the higher requirements of high strength and high corrosion resistance of a naval vessel hull structure, and a welding material which can be matched with the novel low-nitrogen non-magnetic naval vessel steel is not reported in a public way.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides aA seamless flux-cored wire (hereinafter referred to as seamless flux-cored wire) for welding low-nitrogen non-magnetic naval vessel steel is characterized in that 80% Ar + 20% CO is adopted as protective gas2During welding, the welding process has excellent operation performance, can weld at a flat angle position, has stable electric arc and attractive weld formation, is used for welding low-nitrogen non-magnetic naval vessel steel to form weld metal with high strength, good plasticity and toughness, excellent non-magnetism and seawater corrosion resistance, and can meet the technical requirements of non-magnetism, high strength, high toughness and seawater corrosion resistance of a new generation of naval vessel.
In order to achieve the purpose, the invention adopts the technical scheme that:
the seamless flux-cored wire consists of 75-80 wt% of stainless steel band and 20-25 wt% of flux-cored powder.
The stainless steel strip comprises the following chemical components in percentage by weight: c is 0.03-0.08 wt%; si is less than or equal to 1 wt%; mn is less than or equal to 2 wt%; 18-20 wt% of Cr; ni accounts for 8-11 wt%; s is less than or equal to 0.03 wt%; p is less than or equal to 0.03 wt%; the balance being Fe and unavoidable impurities.
The flux-cored powder comprises the following chemical components in percentage by weight: the rutile accounts for 28-32 wt%; 2-4 wt% of quartz sand; 2-4 wt% of sodium potassium titanate; 2-5 wt% of silicon powder; 10-14 wt% of manganese powder; 2-6 wt% of manganese nitride; 20-25 wt% of nickel powder; the chromium powder accounts for 8-10 wt%; the balance being iron powder.
The preparation method of the seamless flux-cored wire comprises the following steps: and filling the flux-cored powder in the stainless steel strip which is drawn into an O shape, and performing high-frequency welding, reducing and surface ceramic spraying treatment to obtain the seamless flux-cored wire for welding the low-nitrogen non-magnetic naval vessel steel.
The low-nitrogen nonmagnetic naval vessel steel is a 0Cr22Ni15Mn6Mo3N steel plate.
The purity of the rutile is more than or equal to 99 percent, and the granularity of the rutile is less than or equal to 0.3 mm.
The purity of the quartz sand is more than or equal to 99 percent, and the granularity of the quartz sand is less than or equal to 0.3 mm.
The purity of the sodium potassium titanate is more than or equal to 99 percent, and the granularity is less than or equal to 0.3 mm.
The Si content of the silicon powder is 70.0-77.0 wt%, and the particle size of the silicon powder is 0.1-0.3 mm.
The purity of the manganese powder is more than or equal to 99 percent, and the granularity of the manganese powder is less than or equal to 0.3mm
The manganese nitride: the nitrogen content is 10 wt%, and the manganese content is 90%; the granularity of the manganese nitride is less than or equal to 0.3 mm.
The purity of the nickel powder is more than or equal to 99 percent, and the granularity of the nickel powder is less than or equal to 0.3 mm.
The purity of the chromium powder is more than or equal to 99 percent, and the granularity of the chromium powder is less than or equal to 0.3 mm.
The purity of the iron powder is more than or equal to 99 percent, and the granularity of the iron powder is less than or equal to 0.3 mm.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
the rutile in the flux-cored powder can adjust the melting point and viscosity of the slag, and improve the stability of electric arc and the formation of welding seams. When the addition amount of rutile is too small, the stability of an electric arc and the performance of a vertical welding process are influenced; when the rutile addition is too large, the weld formation is deteriorated, and the molten pool gas is not easily escaped to generate pores. Therefore, the addition of the rutile is 28-32 wt% of the flux-cored powder, so that good stability of electric arc and good weld forming in the welding process are ensured.
According to the invention, the quartz sand is added into the powder of the medicine core, so that the surface tension of molten iron in a molten pool can be reduced, and the fluidity of the molten iron is enhanced. When the addition amount is small, the effect is not obvious; when the addition amount is large, the melting point of the slag is reduced, the fluidity of the slag is too strong, and the weld joint forming is poor. Therefore, the addition amount of the rutile is 2-4 wt% of the flux-cored powder, and the formability of the weld metal is improved.
The potassium sodium titanate in the flux-cored powder of the invention is mainly used for stabilizing electric arcs. When the adding amount is small, the stable electric arc effect is insufficient, and large particles are easy to splash; when the addition amount is too large, the smoke dust is increased, and the welding process performance is influenced. Therefore, the addition amount of the potassium sodium titanate is 2-4 wt% of the flux-cored powder, the stability of electric arc is obviously improved, and the welding wire is ensured to have good welding manufacturability.
The silicon in the flux-cored powder is an important deoxidizer, and can reduce the oxygen content of weld metal; meanwhile, the fluidity of the molten iron is adjusted. When the addition amount is low, insufficient deoxidation can be caused, and the metal strength and the low-temperature impact toughness of the welding line cannot meet the requirements; when the addition amount is large, the strength of the welding seam is overhigh, the plasticity of the welding seam is reduced, and the crack resistance is poor. Therefore, the adding amount of the silicon powder in the invention is 2-5 wt% of the flux-cored powder, the comprehensive mechanical property of the weld metal is improved, especially the low-temperature impact toughness is improved, and the good formability of the weld metal is also ensured.
Manganese in the flux-cored powder is also one of main deoxidizers, and the oxygen content of weld metal is reduced by adding manganese. When the addition amount of Mn is less than 10 wt%, insufficient deoxidation can be caused, and the metal strength and the low-temperature impact toughness of a welding seam cannot meet the requirements; when the amount exceeds 14 wt%, the weld strength becomes too high and weld plasticity decreases. Therefore, the manganese powder is added in an amount of 10-14 wt% of the flux-cored powder, and the metal strength and crack resistance of the welding seam can be remarkably improved.
The manganese nitride in the flux-cored powder of the invention is the main raw material for transferring nitrogen into weld metal, because the solubility of nitrogen in the weld increases with the increase of manganese. The nitrogen element used in the invention is used as a solid solution strengthening element on one hand, and the steel-plastic toughness is not obviously damaged while the strength of austenitic steel is improved. On the other hand, the element for stabilizing the austenite phase further improves the proportion and the stability of the austenite phase in the weld metal. The nitrogen element stabilizes austenite by 20 times of nickel, and can replace noble nickel element, thereby reducing element cost. In addition, nitrogen can greatly improve the local corrosion resistance of the austenitic stainless steel. However, when the amount of nitrogen added is too low, the above effect is not significant; when the amount of the additive is too high, nitrogen pores are likely to be generated to affect the performance. Therefore, the addition amount of the manganese nitride is 2-6 wt% of the flux-cored powder, so that the strength and the corrosion resistance of weld metal are improved, an austenite phase is stabilized, and the non-magnetism is ensured.
The nickel in the flux-cored powder is a main element for improving the low-temperature toughness, and meanwhile, the self-corrosion point of steel can be improved by adding the nickel. When the addition amount of nickel is low, the above effect is not obvious, and when the addition amount of nickel is high, thermal cracking is easily generated. Therefore, the addition amount of the nickel in the invention is 20-25 wt% of the flux-cored powder, and the low-temperature toughness and corrosion resistance of the weld metal are improved.
The chromium in the flux-cored powder is a main alloy element for improving the strength and the corrosion resistance, and the chromium can form a compact oxidation film on the surface of steel, so that the potential of an electrode is improved, and a passivation effect is generated. And meanwhile, the interaction of chromium and carbon atoms reduces the diffusion effect of carbon, so that the stability of austenite is improved. When the addition amount is low, the above effects are not obvious; when the amount is large, the hardenability tendency is increased and the impact toughness is reduced. Therefore, the addition amount of chromium is 8-10 wt%, so that the corrosion resistance of the weld metal is improved; on the other hand, the comprehensive mechanical property of the weld metal is improved.
When the welding method is used for welding the low-nitrogen non-magnetic naval vessel steel, the electric arc is stable, the welding process performance is excellent, the welding can be carried out at a flat angle position, and the welding seam is attractive in shape. The seamless flux-cored wire prepared by the invention adopts 80% Ar and 20% CO2When gas shielded welding is carried out, the austenite phase fraction of the weld metal is 100%, and the weld metal has no magnetism and excellent seawater corrosion resistance. 80% Ar + 20% CO was used2Gas shielded welding, which is used for detecting weld metal formed by welding low-nitrogen nonmagnetic naval vessel steel: the tensile strength is more than or equal to 635 MPa; the yield strength is more than or equal to 418 MPa; the elongation after fracture is more than or equal to 30 percent; the impact absorption energy at minus 40 ℃ is more than or equal to 50J; has stable mechanical property.
Therefore, the seamless flux-cored wire prepared by the invention has the advantages of excellent welding process performance, capability of welding at a flat angle position, stable electric arc and attractive weld formation, is used for welding weld metal formed by low-nitrogen non-magnetic naval vessel steel, has no magnetism, high strength, good ductility and toughness and excellent seawater corrosion resistance, is matched with novel low-nitrogen non-magnetic naval vessel steel, and can meet the technical requirements of non-magnetism, high strength, high ductility and toughness and seawater corrosion resistance of a naval vessel of a new generation.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting its scope.
A seamless flux-cored wire for welding low-nitrogen non-magnetic naval vessel steel. The seamless flux-cored wire consists of 75-80 wt% of stainless steel band and 20-25 wt% of flux-cored powder.
The stainless steel strip comprises the following chemical components in percentage by weight: c is 0.03-0.08 wt%; si is less than or equal to 1 wt%; mn is less than or equal to 2 wt%; 18-20 wt% of Cr; ni accounts for 8-11 wt%; s is less than or equal to 0.03 wt%; p is less than or equal to 0.03 wt%; the balance being Fe and unavoidable impurities.
The flux-cored powder comprises the following chemical components in percentage by weight: the rutile accounts for 28-32 wt%; 2-4 wt% of quartz sand; 2-4 wt% of sodium potassium titanate; 2-5 wt% of silicon powder; 10-14 wt% of manganese powder; 2-6 wt% of manganese nitride; 20-25 wt% of nickel powder; the chromium powder accounts for 8-10 wt%; the balance being iron powder.
The preparation method of the seamless flux-cored wire comprises the following steps: and filling the flux-cored powder into the stainless steel strip which is drawn into an O shape, and performing high-frequency welding, reducing and surface ceramic spraying treatment to obtain the seamless flux-cored wire for the low-nitrogen non-magnetic naval vessel steel. The diameter of the seamless flux-cored wire is 1.2 mm.
The purity of the rutile is more than or equal to 99 percent, and the granularity of the rutile is less than or equal to 0.3 mm.
The purity of the quartz sand is more than or equal to 99 percent, and the granularity of the quartz sand is less than or equal to 0.3 mm.
The purity of the sodium potassium titanate is more than or equal to 99 percent, and the granularity is less than or equal to 0.3 mm.
The Si content of the silicon powder is 70.0-77.0 wt%, and the particle size of the silicon powder is 0.1-0.3 mm.
The purity of the manganese powder is more than or equal to 99 percent, and the granularity of the manganese powder is less than or equal to 0.3mm
The manganese nitride: the nitrogen content is 10 wt%, and the manganese content is 90%; the granularity of the manganese nitride is less than or equal to 0.3 mm.
The purity of the nickel powder is more than or equal to 99 percent, and the granularity of the nickel powder is less than or equal to 0.3 mm.
The purity of the chromium powder is more than or equal to 99 percent, and the granularity of the chromium powder is less than or equal to 0.3 mm.
The purity of the iron powder is more than or equal to 99 percent, and the granularity of the iron powder is less than or equal to 0.3 mm.
The low-nitrogen nonmagnetic naval vessel steel is a 0Cr22Ni15Mn6Mo3N steel plate: the thickness is 20mm, and the length is 500 mm; the welding groove is V-shaped, and the single-side angle is 45 degrees.
The welding process comprises the following technical parameters: 80% Ar + 20% CO was used2Gas shielded welding; connecting a direct-current reverse connection type power supply to perform welding operation; the welding current is 230-250A, and the welding voltage is 28-30V; the welding speed is 25-26 cm/min.
The weld metal physical and chemical property test is carried out on the seamless flux-cored wire prepared by the specific embodiment, and the groove, the size, the sampling method and the position of the low-nitrogen non-magnetic ship steel are carried out according to the national standard of CB/T1124' inspection rule for identifying, leaving factory and stocking the ship structural steel welding material.
Details are not repeated in the specific embodiments.
Example 1
A seamless flux-cored wire for welding low-nitrogen non-magnetic naval vessel steel. The seamless flux-cored wire of the present embodiment has the following embodiments.
The seamless flux-cored wire consists of 80 wt% of stainless steel band and 20 wt% of flux-cored powder.
The stainless steel strip comprises the following chemical components in percentage by weight: c is 0.03 wt%; si is 1 wt%; mn is 1.8 wt%; cr is 18 wt%; ni is 8 wt%; s is 0.006 wt%; p is 0.003 wt%; the balance being Fe and unavoidable impurities.
The flux-cored powder comprises the following chemical components in percentage by weight: rutile is 28 wt%; 2 wt% of quartz sand; 2 wt% of sodium potassium titanate; 2 wt% of silicon powder; 10 wt% of manganese powder; manganese nitride is 2 wt%; 20 wt% of nickel powder; the chromium powder accounts for 8 wt%; the iron powder was 26 wt%.
The mechanical property of the seamless flux-cored wire prepared by the embodiment used for welding weld metal formed by welding low-nitrogen non-magnetic naval vessel steel is detected as follows: the tensile strength is 635 MPa; the yield strength is 418 MPa; elongation after break of 33.5%; the impact absorption energy at minus 40 ℃ is 65J, 60J and 65J; the austenite phase fraction is 100%; the N content was 0.15 wt%.
Example 2
A seamless flux-cored wire for welding low-nitrogen non-magnetic naval vessel steel. The seamless flux-cored wire of the present embodiment has the following embodiments.
The seamless flux-cored wire consists of 75 wt% of stainless steel band and 25 wt% of flux-cored powder.
The stainless steel strip comprises the following chemical components in percentage by weight: c is 0.08 wt%: si is 0.8 wt%: mn is 1.7 wt%; 20 wt% of Cr; ni is 11 wt%; s is 0.02 wt%; p is 0.02 wt%; the balance being Fe and unavoidable impurities.
The flux-cored powder comprises the following chemical components in percentage by weight: rutile is 30 wt%; 3 wt% of quartz sand; 3 wt% of sodium potassium titanate; 3 wt% of silicon powder; 12 wt% of manganese powder; manganese nitride is 4 wt%; 23 wt% of nickel powder; 9 wt% of chromium powder; the iron powder was 13 wt%.
The mechanical property of the seamless flux-cored wire prepared by the embodiment used for welding weld metal formed by welding low-nitrogen non-magnetic naval vessel steel is detected as follows: the tensile strength is 657 MPa; the yield strength is 439 MPa; elongation after break is 365%; the impact absorption energy at minus 40 ℃ is 75J, 72J and 77J; the austenite phase fraction is 100%; the N content was 0.25 wt%.
Example 3
A seamless flux-cored wire for welding low-nitrogen non-magnetic naval vessel steel. The seamless flux-cored wire of the present embodiment has the following embodiments.
The seamless flux-cored wire consists of 78 wt% of stainless steel band and 22 wt% of flux-cored powder.
The stainless steel strip comprises the following chemical components in percentage by weight: c is 0.05 wt%; si is 0.9 wt%; mn is 2.0 wt%; 19 wt% of Cr; ni is 10 wt%; s is 0.008 wt%; p is 0.005 wt%; the balance being Fe and unavoidable impurities.
The flux-cored powder comprises the following chemical components in percentage by weight: rutile is 32 wt%; 4 wt% of quartz sand; 4 wt% of sodium potassium titanate; 5 wt% of silicon powder; 14 wt% of manganese powder; 6 wt% of manganese nitride; 25 wt% of nickel powder; the content of chromium powder is 10 wt%.
The mechanical properties of the weld metal formed by the seamless flux-cored wire prepared by the embodiment when the seamless flux-cored wire is used for welding low-nitrogen non-magnetic naval vessel steel are detected as follows: the tensile strength is 705 MPa; the yield strength is 495 MPa; elongation after break is 30.0%; the impact absorption energy at minus 40 ℃ is 50J, 58J and 50J; the austenite content is 100%; the N content was 0.35 wt%.
Compared with the prior art, the specific implementation mode has the following positive effects:
the rutile in the flux-cored powder of the embodiment can adjust the melting point and viscosity of the slag, and improve the stability of the electric arc and the formation of the welding seam. When the addition amount of rutile is too small, the stability of an electric arc and the performance of a vertical welding process are influenced; when the rutile addition is too large, the weld formation is deteriorated, and the molten pool gas is not easily escaped to generate pores. Therefore, the addition amount of rutile in the specific embodiment is 28-32 wt% of the flux-cored powder, and good stability of electric arc and good weld forming in the welding process are ensured.
According to the specific embodiment, the quartz sand is added into the powder of the medicine core, so that the surface tension of molten iron in a molten pool can be reduced, and the fluidity of the molten iron is enhanced. When the addition amount is small, the effect is not obvious; when the addition amount is large, the melting point of the slag is reduced, the fluidity of the slag is too strong, and the weld joint forming is poor. Therefore, the addition amount of the rutile in the embodiment is 2-4 wt% of the flux-cored powder, and the formability of the weld metal is improved.
The sodium potassium titanate in the flux cored powder of this embodiment is used primarily to stabilize the arc. When the adding amount is small, the stable electric arc effect is insufficient, and large particles are easy to splash; when the addition amount is too large, the smoke dust is increased, and the welding process performance is influenced. Therefore, the adding amount of the potassium sodium titanate of the embodiment is 2-4 wt% of the flux-cored powder, the stability of the electric arc is obviously improved, and the welding wire is ensured to have good welding manufacturability.
The silicon in the flux-cored powder of the embodiment is an important deoxidizer and can reduce the oxygen content of weld metal; meanwhile, the fluidity of the molten iron is adjusted. When the addition amount is low, insufficient deoxidation can be caused, and the metal strength and the low-temperature impact toughness of the welding line cannot meet the requirements; when the addition amount is large, the strength of the welding seam is overhigh, the plasticity of the welding seam is reduced, and the crack resistance is poor. Therefore, the adding amount of the silicon powder in the embodiment is 2-5 wt% of the flux-cored powder, so that the comprehensive mechanical property of the weld metal, especially the low-temperature impact toughness, is improved, and the good formability of the weld metal is also ensured.
Manganese in the flux-cored powder of the embodiment is also one of main deoxidizers, and the oxygen content of weld metal is reduced by adding manganese element. When the addition amount of Mn is less than 10 wt%, insufficient deoxidation can be caused, and the metal strength and the low-temperature impact toughness of a welding seam cannot meet the requirements; when the amount exceeds 14 wt%, the weld strength becomes too high and weld plasticity decreases. Therefore, the manganese powder is added in an amount of 10-14 wt% of the flux core powder, so that the metal strength and the crack resistance of the weld joint can be obviously improved.
The manganese nitride in the flux cored powder of this embodiment is the primary raw material for the transition of nitrogen into the weld metal because the solubility of nitrogen in the weld increases with increasing manganese. The nitrogen element used in the present embodiment functions as a solid solution strengthening element, on the one hand, and does not significantly impair the toughness of the steel-plastic while improving the strength of the austenitic steel. On the other hand, the element for stabilizing the austenite phase further improves the proportion and the stability of the austenite phase in the weld metal. The nitrogen element stabilizes austenite by 20 times of nickel, and can replace noble nickel element, thereby reducing element cost. In addition, nitrogen can greatly improve the local corrosion resistance of the austenitic stainless steel. However, when the amount of nitrogen added is too low, the above effect is not significant; when the amount of the additive is too high, nitrogen pores are likely to be generated to affect the performance. Therefore, in the embodiment, the addition amount of the manganese nitride is 2-6 wt% of the flux-cored powder, so that the strength and the corrosion resistance of the weld metal are improved, the austenite phase is stabilized, and the non-magnetism is ensured.
The nickel in the flux core powder of the embodiment is a main element for improving the low-temperature toughness, and meanwhile, the self-corrosion point of steel can be improved by adding the nickel. When the addition amount of nickel is low, the above effect is not obvious, and when the addition amount of nickel is high, thermal cracking is easily generated. Therefore, the addition amount of the nickel in the embodiment is 20-25 wt% of the flux-cored powder, and the low-temperature toughness and the corrosion resistance of the weld metal are improved.
Chromium in the flux core powder of the embodiment is a main alloy element for improving the strength and the corrosion resistance, and the chromium can form a compact oxidation film on the surface of steel, so that the potential of an electrode is improved, and a passivation effect is generated. And meanwhile, the interaction of chromium and carbon atoms reduces the diffusion effect of carbon, so that the stability of austenite is improved. When the addition amount is low, the above effects are not obvious; when the amount is large, the hardenability tendency is increased and the impact toughness is reduced. Therefore, the addition amount of chromium in the embodiment is 8-10 wt%, so that the corrosion resistance of the weld metal is improved; on the other hand, the comprehensive mechanical property of the weld metal is improved.
When the specific embodiment is used for welding the low-nitrogen non-magnetic naval vessel steel, the electric arc is stable, the welding process performance is excellent, the welding can be carried out at a flat angle position, and the welding seam is attractive in shape. The seamless flux-cored wire prepared by the specific embodiment adopts 80% of Ar and 20% of CO2When gas shielded welding is carried out, the austenite phase fraction of the weld metal is 100%, and the weld metal has no magnetism and excellent seawater corrosion resistance. 80% Ar + 20% CO was used2Gas shielded welding, which is used for detecting weld metal formed by welding low-nitrogen nonmagnetic naval vessel steel: the tensile strength is more than or equal to 635 MPa; the yield strength is more than or equal to 418 MPa; the elongation after fracture is more than or equal to 30 percent; the impact absorption energy at minus 40 ℃ is more than or equal to 50J; has stable mechanical property. Therefore, the seamless flux-cored wire prepared by the specific embodiment has excellent welding process performance, can be welded at a flat angle position, is stable in electric arc and attractive in weld formation, is used for welding weld metal formed by low-nitrogen non-magnetic naval vessel steel, has no magnetism, high strength, good plastic toughness and excellent seawater corrosion resistance, is matched with novel low-nitrogen non-magnetic naval vessel steel, and can meet the technical requirements of the naval vessel of the new generation on no magnetism, high strength, high plastic toughness and seawater corrosion resistance.

Claims (10)

1. A seamless flux-cored wire for welding low-nitrogen non-magnetic naval vessel steel is characterized by comprising 75-80 wt% of a stainless steel strip and 20-25 wt% of flux-cored powder;
the stainless steel strip comprises the following chemical components in percentage by weight: 0.03-0.08 wt% of C, less than or equal to 1 wt% of Si, less than or equal to 2 wt% of Mn, 18-20 wt% of Cr, 8-11 wt% of Ni, less than or equal to 0.03 wt% of S, less than or equal to 0.03 wt% of P, and the balance of Fe and inevitable impurities;
the flux-cored powder comprises the following chemical components in percentage by weight: 28-32 wt% of rutile, 2-4 wt% of quartz sand, 2-4 wt% of sodium potassium titanate, 2-5 wt% of silicon powder, 10-14 wt% of manganese powder, 2-6 wt% of manganese nitride, 20-25 wt% of nickel powder, 8-10 wt% of chromium powder and the balance of iron powder;
the preparation method of the seamless flux-cored wire comprises the following steps: filling the flux-cored powder in the stainless steel strip which is drawn into an O shape, and carrying out high-frequency welding, reducing and surface ceramic spraying treatment to obtain the seamless flux-cored wire for the low-nitrogen non-magnetic naval vessel steel;
the low-nitrogen nonmagnetic naval vessel steel is a 0Cr22Ni15Mn6Mo3N steel plate.
2. The seamless flux-cored wire for welding of the low-nitrogen nonmagnetic naval vessel steel according to claim 1, wherein the purity of the rutile is more than or equal to 99%, and the granularity of the rutile is less than or equal to 0.3 mm.
3. The seamless flux-cored wire for welding of the low-nitrogen non-magnetic naval vessel steel according to claim 1, wherein the purity of the quartz sand is more than or equal to 99%, and the granularity of the quartz sand is less than or equal to 0.3 mm.
4. The seamless flux-cored wire for welding of the low-nitrogen nonmagnetic vessel steel according to claim 1, wherein the purity of the potassium sodium titanate is not less than 99%, and the granularity is not more than 0.3 mm.
5. The seamless flux-cored wire for welding of low-nitrogen non-magnetic naval vessel steel according to claim 1, wherein the silicon powder has a Si content of 70.0-77.0 wt% and a particle size of 0.1-0.3 mm.
6. The seamless flux-cored wire for welding of low-nitrogen non-magnetic naval vessel steel according to claim 1, wherein the purity of the manganese powder is not less than 99%, and the granularity of the manganese powder is not more than 0.3 mm.
7. The seamless flux-cored wire for welding of low-nitrogen nonmagnetic vessel steel according to claim 1, wherein the manganese nitride: the nitrogen content is 10 wt%, and the manganese content is 90%; the granularity of the manganese nitride is less than or equal to 0.3 mm.
8. The seamless flux-cored wire for welding the low-nitrogen non-magnetic naval vessel steel according to claim 1, wherein the purity of the nickel powder is more than or equal to 99%, and the granularity of the nickel powder is less than or equal to 0.3 mm.
9. The seamless flux-cored wire for welding of the low-nitrogen non-magnetic naval vessel steel according to claim 1, wherein the purity of the chromium powder is more than or equal to 99%, and the granularity of the chromium powder is less than or equal to 0.3 mm.
10. The seamless flux-cored wire for welding of low-nitrogen non-magnetic naval vessel steel according to claim 1, wherein the purity of the iron powder is not less than 99%, and the particle size of the iron powder is not more than 0.3 mm.
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JP3017063B2 (en) * 1995-11-07 2000-03-06 株式会社神戸製鋼所 High nitrogen flux cored wire for all-position welding of Cr-Ni stainless steel
CN101829865A (en) * 2010-05-11 2010-09-15 南通晨曦焊业有限公司 Stainless steel flux cored wire for carbon dioxide gas protection
CN103737198B (en) * 2014-01-15 2016-01-06 四川大西洋焊接材料股份有限公司 A kind of stainless steel welded gas-shielded flux-cored wire
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CN108971798B (en) * 2018-09-29 2021-01-19 四川大西洋焊接材料股份有限公司 Special welding wire for mixed gas shielded austenitic stainless steel and preparation method thereof

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