CN112404796B - Seamless metal core flux-cored welding wire for welding low-nitrogen non-magnetic naval vessel steel - Google Patents
Seamless metal core flux-cored welding wire for welding low-nitrogen non-magnetic naval vessel steel Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- 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
- B23K35/02—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
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/406—Filled tubular wire or rods
Abstract
The invention relates to a seamless metal core flux-cored welding wire for welding low-nitrogen non-magnetic naval vessel steel. The technical scheme is as follows: and filling 20-30 wt% of flux-cored powder into an O-shaped stainless steel strip, and performing high-frequency welding, reducing and surface ceramic spraying treatment to obtain the seamless metal-cored flux-cored wire. The stainless steel strip comprises the following chemical components: 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 of the medicine core powder are as follows: 2-5 wt% of quartz sand, 0.5-1.2 wt% of lithium fluoride, 0.5-1 wt% of rare earth fluoride, 4-8 wt% of silicon powder, 15-20 wt% of manganese powder, 10-16 wt% of manganese nitride, 20-25 wt% of nickel powder, 18-20 wt% of chromium powder and the balance of iron powder. The welding seam formed by welding the low-nitrogen non-magnetic naval vessel steel has high metal strength, good plasticity and toughness, and excellent non-magnetism and seawater corrosion resistance.
Description
Technical Field
The invention belongs to the technical field of seamless metal core flux-cored wires. In particular to a seamless metal core flux-cored welding wire for welding low-nitrogen non-magnetic naval vessel steel.
Background
917 nonmagnetic steel is Mn-Al component nonmagnetic steel developed in 60-70 years in 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, and although the design and use requirements of various naval vessels can be met, the actual value of the yield strength is lower and 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: 0Cr22Ni15Mn6Mo3N (hereinafter referred to as low nitrogen nonmagnetic vessel steel). The steel grade has the characteristics of high strength, high ductility and toughness, no magnetism and better seawater corrosion resistance by adopting low nitrogen content (mass fraction is 0.25-0.35) and adopting the mechanisms of solid solution strengthening, precipitation strengthening and fine grain strengthening and toughening. In addition, the addition of nitrogen also enables the steel to have more excellent corrosion resistance. The 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 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 a seamless metal core flux-cored wire for welding low-nitrogen non-magnetic naval vessel steel, wherein 80% Ar + 20% CO is adopted as protective gas2During welding, the operation manufacturability is excellent, the electric arc is stable, the forming is good, and the all-position welding can be realized; the seamless metal core flux-cored wire is used for welding low-nitrogen non-magnetic naval vessel steel to form weld metal, has high strength, high ductility and toughness and good non-magnetism and seawater corrosion resistance, and can meet the technical requirements of non-magnetism, high strength, high toughness and excellent 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 metal core flux-cored wire for welding the low-nitrogen non-magnetic naval vessel steel (hereinafter referred to as seamless metal core flux-cored wire) consists of 70-80 wt% of a stainless steel band and 20-30 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: 2-5 wt% of quartz sand; 0.5-1.2 wt% of lithium fluoride; 0.5-1 wt% of rare earth fluoride; 4-8 wt% of silicon powder; 15-20 wt% of manganese powder; 10-16 wt% of manganese nitride; 20-25 wt% of nickel powder; the chromium powder accounts for 18-20 wt%; the balance being iron powder.
The preparation method of the seamless metal core 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 carrying out high-frequency welding, reducing and surface ceramic spraying treatment to obtain the seamless metal core flux-cored welding wire for the low-nitrogen non-magnetic naval vessel steel.
The low-nitrogen nonmagnetic naval vessel steel is a 0Cr22Ni15Mn6Mo3N steel plate.
SiO in the quartz sand2The content is more than or equal to 99 wt%, and the granularity of the quartz sand is 0.1-0.2 mm.
The purity of the lithium fluoride is more than or equal to 99%, and the granularity of the lithium fluoride is 0.15-0.2 mm.
The purity of the rare earth fluoride is more than or equal to 99%, and the granularity of the rare earth fluoride is 0.15-0.20 mm.
The silicon powder has a Si content of 70.0-77.0 wt% and a particle size of 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 0.3 mm.
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, the invention has the following positive effects:
the quartz sand adopted in the flux-cored powder can reduce the surface tension of molten iron in a molten pool and enhance the fluidity of the molten iron. When the addition amount of the quartz sand 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 quartz sand is 2-5 wt% of the flux-cored powder, and the seamless metal-cored flux-cored wire has good formability when used for welding weld metal formed by welding low-nitrogen non-magnetic naval vessel steel.
The lithium fluoride adopted in the flux core powder material has the function of dehydrogenation, and the proper addition amount can stabilize electric arc. But when the addition amount of the lithium fluoride is too large, the stability of electric arc is reduced, and welding spatter and smoke dust are increased; if the amount is too small, the ability to remove hydrogen is lowered, and the occurrence of pore indentation is likely to occur. Therefore, the lithium fluoride is added in an amount of 0.5-1.2 wt% of the flux core powder, so that the electric arc can be effectively stabilized, the dehydrogenation capacity can be improved, and the low-temperature toughness of the weld metal can be improved.
The rare earth fluoride adopted in the medicine core powder material can play a role in removing hydrogen, and the rare earth elements can fix nitrogen, have high affinity with impurity sulfur, can change the shape, quantity and distribution of the impurities, and reduce the harmful effect of the impurities on toughness. Therefore, the addition amount of the rare earth fluoride is 0.5-1 wt% of the flux core powder, and the low-temperature toughness of the weld metal can be effectively improved.
The silicon adopted in the flux-cored powder is an important deoxidizer, and the welding wire contains a certain amount of silicon, so that the oxygen content of weld metal can be reduced, the low-temperature impact toughness is improved, and the fluidity of molten iron is adjusted. If the addition amount of silicon is too low, insufficient deoxidation can be caused, and the metal strength and the low-temperature impact toughness of the welding line cannot meet the requirements; too high an amount of addition results in increased strength of the weld metal, reduced plasticity and poor crack resistance. Therefore, the addition amount of the silicon in the invention is 4-8 wt% of the flux-cored powder, and the metal strength and the low-temperature impact toughness of the welding seam are further improved.
The manganese powder adopted in the flux-cored powder is a main deoxidizer, and can reduce the oxygen content of weld metal and increase the strength and crack resistance of the weld metal; meanwhile, the manganese powder also plays a role in fixing nitrogen. In addition, the addition amount of the manganese powder is mainly considered from the aspect of improving the crack resistance of the austenitic weld metal, when the addition amount of the manganese is too low, the deoxidation is insufficient, and the weld metal strength and the low-temperature impact toughness can not meet the requirements; when the addition of manganese is too high, the metal strength of the welding seam is too high, and the plasticity of the welding seam is reduced. Therefore, the addition amount of the manganese powder is 15-20 wt% of the flux core powder, and the metal strength and the low-temperature impact toughness of the weld joint can be effectively improved.
The manganese nitride adopted in the flux-cored powder is a main raw material for transferring nitrogen into weld metal, and the solubility of nitrogen in a weld increases along with the increase of manganese. On one hand, the nitrogen element is mainly used as a solid solution strengthening element, so that the steel-plastic toughness is not obviously damaged while the strength of austenitic steel is improved. On the other hand, nitrogen is an element stabilizing the austenite phase, further improving the proportion and stability of the austenite phase in the weld metal. The effect of stabilizing austenite is about 20 times of that of nickel, and the nickel can replace noble nickel elements, thereby reducing the element cost. In addition, the nitrogen element 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 10-16 wt% of the flux-cored powder, so that the strength and the corrosion resistance of the weld metal are improved, the austenite phase can be stabilized, and the weld metal has no magnetism.
The nickel adopted in the flux-cored powder is a main element for improving the low-temperature toughness, and meanwhile, the addition of the nickel can improve the self-corrosion point position of steel and increase the corrosion resistance of the steel. When the addition amount is too low, the above effect is not obvious, and when the addition amount is too 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 can be obviously improved.
Chromium adopted 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 electrode potential is improved, the passivation effect is generated, and the corrosion resistance of the steel is improved. Meanwhile, the diffusion speed of chromium in iron is low, and 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 tends to be increased and the impact toughness tends to be lowered. Therefore, the addition amount of the chromium is 18-20 wt%, and the strength and the corrosion resistance of the weld metal are further improved.
The seamless metal core flux-cored wire prepared by the invention adopts 80% of Ar and 20% of CO2When gas shielded welding is carried out, the weld metal is a full austenite structure, the magnetic conductivity is zero, and the magnetism is not generated.
The seamless metal core flux-cored welding wire prepared by the invention has stable electric arc during welding, excellent welding process performance, capability of welding at a flat angle position and attractive weld formation. The seamless metal core flux-cored welding wire prepared by the invention is used for welding weld metal formed by welding low-nitrogen non-magnetic naval vessel steel, and is detected as follows: the tensile strength is more than or equal to 645 MPa; the yield strength is more than or equal to 415 MPa; elongation after fracture is more than 33.6%; -40 ℃ impact absorption energy greater than 59J; the austenite phase fraction is 100%; the content of N is more than or equal to 0.19wt percent.
Therefore, the seamless metal core flux-cored welding wire prepared by the invention has stable electric arc during welding, excellent welding process performance, capability of welding at a flat angle position and attractive weld formation; the seamless metal core flux-cored wire is used for welding low-nitrogen non-magnetic naval vessel steel to form a welding seam with high metal strength, high ductility and toughness, good non-magnetism and seawater corrosion resistance, is matched with the low-nitrogen non-magnetic naval vessel steel, and can meet the technical requirements of the new generation of naval vessels on non-magnetism, high strength, high ductility and toughness and excellent seawater corrosion resistance.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting its scope.
A seamless metal core flux-cored welding wire for welding low-nitrogen non-magnetic naval vessel steel. The seamless metal core flux-cored wire for welding the low-nitrogen non-magnetic naval vessel steel (hereinafter referred to as seamless metal core flux-cored wire) consists of 70-80 wt% of a stainless steel band and 20-30 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: 2-5 wt% of quartz sand; 0.5-1.2 wt% of lithium fluoride; 0.5-1 wt% of rare earth fluoride; 4-8 wt% of silicon powder; 15-20 wt% of manganese powder; 10-16 wt% of manganese nitride; 20-25 wt% of nickel powder; the chromium powder accounts for 18-20 wt%; the balance being Fe powder.
The preparation method of the seamless metal core 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 carrying out high-frequency welding, reducing and surface ceramic spraying treatment to obtain the seamless metal core flux-cored welding wire for the low-nitrogen non-magnetic naval vessel steel.
The diameter of the seamless metal core flux-cored wire is 1.2 mm.
SiO in the quartz sand2The content is more than or equal to 99 wt%, and the granularity of the quartz sand is 0.1-0.2 mm.
The purity of the lithium fluoride is more than or equal to 99%, and the granularity of the lithium fluoride is 0.15-0.2 mm.
The purity of the rare earth fluoride is more than or equal to 99%, and the granularity of the rare earth fluoride is 0.15-0.20 mm.
The silicon powder has a Si content of 70.0-77.0 wt% and a particle size of 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 0.3 mm.
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 parameters of the specific embodiment are as follows: 80% Ar + 20% CO was used2And (3) gas shielded welding, namely connecting a direct-current reverse connection type power supply to perform welding operation: the welding current is 220-240A, the welding voltage is 27-29V, and the welding speed is 25-26 cm/min.
The weld metal physical and chemical property test is carried out on the seamless metal core flux-cored welding wire of the embodiment, and the groove, the size, the sampling method and the position of the low-nitrogen non-magnetic naval vessel steel are carried out according to the national standard of CB/T1124' inspection rule for identifying, leaving factory and stocking goods of the high-strength ship structural steel welding material for ships.
Details are not repeated in the specific embodiments.
Example 1
A seamless metal core flux-cored welding wire for welding low-nitrogen non-magnetic naval vessel steel. The seamless metal-cored flux-cored wire of the present embodiment is the same as the embodiment except for the following.
The seamless metal core flux-cored wire consists of 70 wt% of stainless steel band and 30 wt% of flux-cored powder.
The stainless steel strip comprises the following chemical components in percentage by weight: 0.03 wt% of C, 1 wt% of Si, 1.8 wt% of Mn, 18 wt% of Cr, 8 wt% of Ni, 0.003 wt% of P, 0.006 wt% of S, and the balance of Fe and inevitable impurities.
The flux-cored powder comprises the following chemical components in percentage by weight: 2 wt% of quartz sand; lithium fluoride 0.5 wt%; 0.5 wt% of rare earth fluoride; silicon is 4 wt%; 15 wt% of manganese; the manganese nitride accounts for 12 wt%; the nickel accounts for 20 wt%; chromium is 18 wt%; the Fe powder accounts for 28 wt%.
The mechanical properties of the weld metal formed by the seamless metal core flux-cored welding wire used for welding low-nitrogen non-magnetic naval vessel steel are detected as follows: the tensile strength is 645 MPa; the yield strength is 415 MPa; elongation after break of 36.5%; the energy absorbed by impact at-40 ℃ is 75J, 70J and 75J. The austenite content is 100%; the N content was 0.19 wt%.
Example 2
A seamless metal core flux-cored welding wire for welding low-nitrogen non-magnetic naval vessel steel. The seamless metal-cored flux-cored wire of the present embodiment is the same as the embodiment except for the following.
The seamless metal core flux-cored welding 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: 0.08 wt% of C, 0.8 wt% of Si, 1.7 wt% of Mn, 20 wt% of Cr, 11 wt% of Ni, 0.02 wt% of P, 0.02 wt% of S, and the balance of Fe and inevitable impurities.
The flux-cored powder comprises the following chemical components in percentage by weight: 4 wt% of quartz sand; lithium fluoride 0.8 wt%; 0.7 wt% of rare earth fluoride; 6 wt% of silicon; manganese accounts for 16 wt%; manganese nitride of 14 wt%; 23 wt% of nickel; 19 wt% of chromium; the Fe powder content was 16.5 wt%.
The mechanical properties of the weld metal formed by the seamless metal core flux-cored welding wire used for welding low-nitrogen non-magnetic naval vessel steel are detected as follows: the tensile strength is 659 MPa; the yield strength is 448 MPa; elongation after break is 40.8%; the energy absorbed by impact at-40 ℃ is 79J, 70J and 73J. The austenite content is 100%; the N content was 0.28 wt%.
Example 3
A seamless metal core flux-cored welding wire for welding low-nitrogen non-magnetic naval vessel steel. The seamless metal-cored flux-cored wire of the present embodiment is the same as the embodiment except for the following.
The seamless metal core 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: 0.5 wt% of C, 0.9 wt% of Si, 2.0 wt% of Mn, 19 wt% of Cr, 10 wt% of Ni, 0.005 wt% of P, 0.008 wt% of S, and the balance of Fe and inevitable impurities.
The flux-cored powder comprises the following chemical components in percentage by weight: 5 wt% of quartz sand; lithium fluoride 1.2 wt%; 1 wt% of rare earth fluoride; silicon 8 wt%; 20 wt% of manganese; manganese nitride 16 wt%; 25 wt% of nickel; 20 wt% of chromium; the Fe powder content was 3.8 wt%.
The mechanical properties of the weld metal formed by the seamless metal core flux-cored welding wire used for welding low-nitrogen non-magnetic naval vessel steel are detected as follows: the tensile strength is 736 MPa; the yield strength is 503 MPa; elongation after break of 33.6%; -40 ℃ impact absorption energy 60J, 59J, 60J. The austenite content is 100%; the N content was 0.39 wt%.
Compared with the prior art, the specific implementation mode has the following positive effects:
the quartz sand adopted in the flux-cored powder material of the embodiment can reduce the surface tension of molten iron in a molten pool and enhance the fluidity of the molten iron. When the addition amount of the quartz sand 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 quartz sand in the embodiment is 2-5 wt% of the flux-cored powder, and the seamless metal-cored flux-cored wire has good formability when used for welding the low-nitrogen non-magnetic naval vessel steel to form weld metal.
The lithium fluoride used in the flux core powder of the present embodiment serves to dehydrogenate, and a suitable amount of addition stabilizes the arc. But when the addition amount of the lithium fluoride is too large, the stability of electric arc is reduced, and welding spatter and smoke dust are increased; if the amount is too small, the ability to remove hydrogen is lowered, and the occurrence of pore indentation is likely to occur. Therefore, the addition amount of the lithium fluoride in the embodiment is 0.5-1.2 wt% of the flux core powder, so that the electric arc can be effectively stabilized, the dehydrogenation capacity can be improved, and the low-temperature toughness of the weld metal can be improved.
The rare earth fluoride adopted in the flux core powder material of the embodiment can play a role in dehydrogenation, and the rare earth element can fix nitrogen, has high affinity with sulfur as an impurity, can change the shape, quantity and distribution of the impurity, and reduces the harmful effect of impurities on toughness. Therefore, the addition amount of the rare earth fluoride in the embodiment is 0.5-1 wt% of the flux core powder, and the low-temperature toughness of the weld metal can be effectively improved.
The silicon adopted in the flux-cored powder of the embodiment is an important deoxidizer, and the welding wire contains a certain amount of silicon, so that the oxygen content of weld metal can be reduced, the low-temperature impact toughness can be improved, and the fluidity of molten iron can be adjusted. If the addition amount of silicon is too low, insufficient deoxidation can be caused, and the metal strength and the low-temperature impact toughness of the welding line cannot meet the requirements; too high an amount of addition results in increased strength of the weld metal, reduced plasticity and poor crack resistance. Therefore, the addition amount of the silicon in the embodiment is 4-8 wt% of the flux-cored powder, and the metal strength and the low-temperature impact toughness of the welding seam are further improved.
The manganese powder adopted in the flux-cored powder of the embodiment is a main deoxidizer, and can reduce the oxygen content of weld metal and increase the strength and crack resistance of the weld metal; meanwhile, the manganese powder also plays a role in fixing nitrogen. In addition, the addition amount of the manganese powder is mainly considered from the aspect of improving the crack resistance of the austenitic weld metal, when the addition amount of the manganese is too low, the deoxidation is insufficient, and the weld metal strength and the low-temperature impact toughness can not meet the requirements; when the addition of manganese is too high, the metal strength of the welding seam is too high, and the plasticity of the welding seam is reduced. Therefore, the addition amount of the manganese powder in the embodiment is 15-20 wt% of the flux core powder, and the metal strength and the low-temperature impact toughness of the welding seam can be effectively improved.
The manganese nitride used in the flux-cored powder of this embodiment is the primary raw material for the transition of nitrogen into the weld metal, since the solubility of nitrogen in the weld increases with the increase of manganese. On the one hand, the nitrogen element adopted by the embodiment is mainly used as a solid solution strengthening element, so that the strength of the austenitic steel is improved, and meanwhile, the toughness of the steel and the steel is not obviously damaged. On the other hand, nitrogen is an element stabilizing the austenite phase, further improving the proportion and stability of the austenite phase in the weld metal. The effect of stabilizing austenite is about 20 times of that of nickel, and the nickel can replace noble nickel elements, thereby reducing the element cost. In addition, the nitrogen element 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 10-16 wt% of the flux-cored powder, so that the strength and the corrosion resistance of the weld metal are improved, the austenite phase can be stabilized, and the weld metal has no magnetism.
The nickel adopted in the flux-cored powder of the embodiment is a main element for improving the low-temperature toughness, and meanwhile, the addition of the nickel can improve the self-corrosion point position of the steel and increase the corrosion resistance of the steel. When the addition amount is too low, the above effect is not obvious, and when the addition amount is too high, thermal cracking is easily generated. Therefore, the addition amount of the nickel in the embodiment is 20-25 wt% of the flux core powder, and the low-temperature toughness and the corrosion resistance of the weld metal can be obviously improved.
Chromium adopted in the flux-cored 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 electrode potential is improved, the passivation effect is generated, and the corrosion resistance of the steel is improved. Meanwhile, the diffusion speed of chromium in iron is low, and 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 tends to be increased and the impact toughness tends to be lowered. Therefore, the addition amount of the chromium in the embodiment is 18-20 wt%, and the strength and the corrosion resistance of the weld metal are further improved.
The seamless metal core flux-cored wire prepared by the specific embodiment adopts 80% of Ar and 20% of CO2When gas shielded welding is carried out, the weld metal is a full austenite structure, the magnetic conductivity is zero, and the magnetism is not generated.
The seamless metal core flux-cored wire prepared by the specific embodiment has stable electric arc during welding, excellent welding process performance, capability of welding at a flat angle position and attractive weld formation. The seamless metal core flux-cored wire prepared by the specific embodiment is used for welding seam metal formed by welding low-nitrogen non-magnetic naval vessel steel, and is detected as follows: the tensile strength is more than or equal to 645 MPa; the yield strength is more than or equal to 415 MPa; elongation after fracture is more than 33.6%; -40 ℃ impact absorption energy greater than 59J; the austenite phase fraction is 100%; the content of N is more than or equal to 0.19wt percent.
Therefore, the seamless metal core flux-cored wire prepared by the specific embodiment has stable electric arc during welding, excellent welding process performance, capability of welding at a flat angle position and attractive weld joint formation; the seamless metal core flux-cored wire is used for welding low-nitrogen non-magnetic naval vessel steel to form a welding seam with high metal strength, high ductility and toughness, good non-magnetism and seawater corrosion resistance, is matched with the low-nitrogen non-magnetic naval vessel steel, and can meet the technical requirements of the new generation of naval vessels on non-magnetism, high strength, high ductility and toughness and excellent seawater corrosion resistance.
Claims (10)
1. A seamless metal core flux-cored wire for welding low-nitrogen non-magnetic naval vessel steel is characterized by comprising 70-80 wt% of a stainless steel strip and 20-30 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: 2-5 wt% of quartz sand, 0.5-1.2 wt% of lithium fluoride, 0.5-1 wt% of rare earth fluoride, 4-8 wt% of silicon powder, 15-20 wt% of manganese powder, 10-16 wt% of manganese nitride, 20-25 wt% of nickel powder, 18-20 wt% of chromium powder and the balance of iron powder;
the preparation method of the seamless metal core 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 metal core 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 metal-cored flux-cored welding wire for welding of low-nitrogen nonmagnetic vessel steel according to claim 1, characterized in that SiO in the quartz sand2The content is more than or equal to 99 wt%, and the granularity of the quartz sand is 0.1-0.2 mm.
3. The seamless metal core flux-cored welding wire for welding of the low-nitrogen non-magnetic naval vessel steel according to claim 1, wherein the purity of the lithium fluoride is more than or equal to 99%, and the granularity of the lithium fluoride is 0.15-0.2 mm.
4. The seamless metal core flux-cored welding wire for welding of the low-nitrogen nonmagnetic naval vessel steel according to claim 1, wherein the purity of the rare earth fluoride is more than or equal to 99%, and the granularity of the rare earth fluoride is 0.15-0.20 mm.
5. The seamless metal core 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 metal core flux-cored welding wire for welding of low-nitrogen non-magnetic naval vessel steel according to claim 1, wherein the purity of the manganese powder is more than or equal to 99%, and the granularity of the manganese powder is less than or equal to 0.3 mm.
7. The seamless metal-cored flux-cored welding wire for welding of low-nitrogen nonmagnetic vessel steel according to claim 1, characterized in that 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 metal core flux-cored wire for welding of low-nitrogen non-magnetic naval vessel steel according to claim 1, wherein the purity of the nickel powder is not less than 99%, and the particle size of the nickel powder is not more than 0.3 mm.
9. The seamless metal core flux-cored welding 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 metal core flux-cored welding wire for welding of low-nitrogen non-magnetic naval vessel steel according to claim 1, wherein the purity of the iron powder is more than or equal to 99%, and the particle size of the iron powder is less than or equal to 0.3 mm.
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| CN109967916A (en) * | 2019-05-17 | 2019-07-05 | 武汉铁锚焊接材料股份有限公司 | A kind of austenitic stainless steel flux-cored wire of resistance to non-oxidizable acid corrosion and its application |
| CN110181197A (en) * | 2019-06-17 | 2019-08-30 | 武汉科技大学 | A kind of high nitrogen metal powder-cored wire suitable for the welding of high nitrogen armour steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101220618B1 (en) * | 2010-12-27 | 2013-01-10 | 주식회사 포스코 | Flux cored arc weld wire having excellent workability and low-temperature toughness in weld metal joint and weld metal joint using the same |
| CN105014261B (en) * | 2015-07-30 | 2017-08-04 | 武汉铁锚焊接材料股份有限公司 | A kind of chrome-molybdenum steel seamless metal powder core type flux-cored wire |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE2356640A1 (en) * | 1972-11-13 | 1974-06-06 | Tsukishima Kikai Co | WELDING WIRE WITH FLUX SOUL |
| CN1172712A (en) * | 1996-06-11 | 1998-02-11 | 伊利诺斯工具制造公司 | Metal-core weld wire for welding galvanized steels |
| CN109967916A (en) * | 2019-05-17 | 2019-07-05 | 武汉铁锚焊接材料股份有限公司 | A kind of austenitic stainless steel flux-cored wire of resistance to non-oxidizable acid corrosion and its application |
| CN110181197A (en) * | 2019-06-17 | 2019-08-30 | 武汉科技大学 | A kind of high nitrogen metal powder-cored wire suitable for the welding of high nitrogen armour steel |
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