CN113714682A - Super duplex stainless steel self-protection flux-cored wire and preparation method thereof - Google Patents
Super duplex stainless steel self-protection flux-cored wire and preparation method thereof Download PDFInfo
- Publication number
- CN113714682A CN113714682A CN202110995440.5A CN202110995440A CN113714682A CN 113714682 A CN113714682 A CN 113714682A CN 202110995440 A CN202110995440 A CN 202110995440A CN 113714682 A CN113714682 A CN 113714682A
- Authority
- CN
- China
- Prior art keywords
- powder
- flux
- percent
- stainless steel
- cored
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- B23K35/40—Making wire or rods for soldering or welding
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
- B23K2103/05—Stainless steel
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention discloses a super duplex stainless steel self-protection flux-cored wire and a preparation method thereof, wherein the self-protection flux-cored wire consists of a steel strip and flux-cored powder filled in the steel strip, and the steel strip comprises the following chemical components in percentage by mass of 100 percent: 16.0-17.0% of Cr16.0-3.0% of Mo2.0-3.0%, 0.30-0.40% of Mn0.25-0.30% of Si, 0.10-0.20% of Ni0.10-0.20% and the balance of Fe; the flux core powder is alloy powder, and comprises the following chemical components: 5.0 to 8.0 percent of Cr5.0 to 8.0 percent of Ni2.0 to 4.0 percent of V0.5 to 1.0 percent of N0.10 to 0.20 percent of N, 0.5 to 0.8 percent of ferrite nano nucleating agent, 0.2 to 0.4 percent of austenite nano nucleating agent, 4.0 to 6.0 percent of slagging agent, 1.5 to 3.0 percent of deoxidizer and the balance of iron. According to the invention, a plurality of nucleating agents are added into the self-shielded flux-cored wire, so that the structures of ferrite and austenite are equiaxed and crystallized, the matrix grains are micronized, and the ratio of ferrite to austenite phases is about 50%: 50 percent of refined structure and excellent comprehensive performance of high strength and high corrosion resistance.
Description
Technical Field
The invention relates to the technical field of welding materials, in particular to a super duplex stainless steel self-protection flux-cored wire and a preparation method thereof.
Background
With the continuous expansion of the breadth and the depth of ocean development, higher requirements are put forward on the corrosion resistance of ocean engineering materials. Therefore, the development of various novel steel grades including ferrite-austenite duplex stainless steel and super duplex stainless steel is carried out at home and abroad. The SAF2507 super duplex stainless steel belongs to third generation duplex stainless steel, has low carbon content, high content of nitrogen and molybdenum elements, corrosion resistance equivalent PREN value more than 40, more excellent mechanical property, extremely high pitting corrosion resistance, crevice corrosion resistance, stress corrosion resistance (SCC) and uniform corrosion resistance, thereby having good application prospect in ocean engineering.
The super duplex stainless steel is used as a structural material of ocean engineering, and the welding processing is the most commonly adopted processing mode. The methods of manual Shielded Metal Arc Welding (SMAW), tungsten argon arc welding (GTAW), Gas Metal Arc Welding (GMAW) and the like can be applied to welding of super duplex stainless steel. Although super duplex stainless steel has good weldability, the common problems of duplex stainless steel welding, such as unbalance of the ratio of two phases and precipitation of harmful phases, still occur. In the process of welding the super duplex stainless steel, the key points are to ensure the ideal proportion of two phases and avoid harmful phases. To overcome these problems, a great deal of experimental research has been conducted by domestic and foreign scholars mainly around the development of the welding process and the matched welding materials of the super duplex stainless steel. Research shows that on the premise of selecting proper welding materials, reasonable welding process parameters are adopted, and the line energy and the interlayer temperature are strictly controlled, so that the super duplex stainless steel welding joint can be ensured to have reasonable duplex proportion, good low-temperature impact toughness and pitting corrosion resistance. In addition, by improving the chemical composition components of the sheath and the flux core of the flux-cored wire, the balance of the ratio of two phases of austenite and ferrite in the weld metal can be ensured, so that the comprehensive mechanical property and the corrosion resistance of a welding joint are ensured.
Chinese patent publication No. CN110142529AThe flux-cored wire for gas shielded welding of super duplex stainless steel and the preparation method thereof are disclosed, the adopted external steel belt is an austenitic stainless steel belt with 17.0-18.0% of chromium and 11.0-12.5% of nickel, and the components and contents of the powder are as follows: 36.0-38.0 percent of chromium powder, 9.0-13.0 percent of high-nitrogen ferrochrome, 2.5-3.0 percent of electrolytic manganese metal, 4.0-5.0 percent of molybdenum powder, 0.5-1.0 percent of ferrosilicon, 1.0-1.5 percent of ferrotitanium, 0.5-1.0 percent of aluminum-magnesium alloy, 18.0-20.0 percent of rutile, 1.0-2.0 percent of quartz, 5.0-6.0 percent of zircon sand, 1.0-1.5 percent of potash feldspar, 3.0-3.5 percent of albite, 1.0-1.5 percent of fluorite, 0.5-1.0 percent of sodium cryolite, 1.0-1.5 percent of potassium titanate, 0.1-0.3 percent of bismuth oxide and the balance of iron powder. According to the technical scheme, the nickel element is introduced into the external steel belt, so that the nickel content in the cladding metal is ensured, and meanwhile, the acidity of a welding wire slag system is properly reduced to enable the welding wire slag system to be between a titanic acid type slag system and a neutral slag system, so that the super duplex stainless steel flux-cored wire with excellent welding process performance is obtained. The chinese patent publication CN107097016A discloses a flux-cored wire and a welding metal for arc welding suitable for duplex stainless steel, which uses a sheath made of stainless steel, filled with fluxes of different chemical compositions and contents, and mainly contains Cr, Ni, Mo, N, Mn and Si, and by adding a metal oxide and a fluoride as components for forming slag, the metal oxide is TiO2、SiO2、ZrO2The metal fluoride has the function of adjusting the fluidity of the welding slag, improving the stripping property of the welding slag, inhibiting defects such as pits and air holes, and the like, and the welding wire has excellent low-temperature toughness and pitting corrosion resistance. Chinese patent publication No. CN102046325A discloses a flux-cored wire for welding duplex stainless steel, which mainly contains 2.0 to 6.0% of Mn, 17.0 to 27.0% of Cr, 1.0 to 10.0% of Ni, 0.1 to 3.0% of Mo, 0.002 to 0.05% of Al, 0.0005 to 0.01% of Mg, 0.001 to 0.5% of Ti, and 0.10 to 0.30% of N, and in which the solidification is completed with a ferrite single phase, by adding Mg and Ti in a composite manner, equiaxial crystallization and refinement of the weld metal structure can be achieved, thereby improving the toughness and ductility of the weld metal. Furthermore, in the ferrite single phase junctionIn the component system of the beam solidification, by controlling the proportional relationship between the amounts of Ti and N, the weld metal solidified grains can be easily refined, and the toughness and ductility can be improved even in the solidified state. In summary, the welding material for duplex stainless steel disclosed in the prior art controls the proportion of two phases in weld metal by alloy elements so as to inhibit the precipitation of harmful phases, but the addition of the nucleating agent is mainly performed in a single nucleating agent manner, for example, TiN having a coherent interface with a ferrite phase is added as a solidification nucleus of the ferrite phase, so as to promote equiaxed crystallization of the ferrite phase and refine ferrite grains during solidification.
Disclosure of Invention
The invention aims to provide a super duplex stainless steel self-shielded flux-cored wire and a preparation method thereof, which are characterized in that a plurality of nucleating agents are added into flux-cored powder of the self-shielded flux-cored wire to promote equiaxial crystallization of structures of ferrite and austenite, and matrix grains are micronized, so that the ratio of ferrite to austenite phases is about 50%: 50 percent of refined structure and excellent comprehensive performance of high strength and high corrosion resistance.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the self-protection flux-cored wire for the super duplex stainless steel consists of a steel strip and flux-cored powder filled in the steel strip, wherein the steel strip comprises the following chemical components in percentage by mass of 100 percent: 16.0-17.0% of Cr, 2.0-3.0% of Mo, 0.30-0.40% of Mn, 0.25-0.30% of Si, 0.10-0.20% of Ni and the balance of Fe; the flux core powder is alloy powder, and comprises the following chemical components: 5.0 to 8.0 percent of Cr, 2.0 to 4.0 percent of Ni, 0.5 to 1.0 percent of V, 0.10 to 0.20 percent of N, 0.5 to 0.8 percent of ferrite nano nucleating agent, 0.2 to 0.4 percent of austenite nano nucleating agent, 4.0 to 6.0 percent of slagging agent, 1.5 to 3.0 percent of deoxidizer and the balance of iron.
As a further improvement of the scheme, the ferrite nano nucleating agent is selected from CaS and La2O3Any one of, the austenite nano nucleating agent is selected from ZrO2And MnS.
As a further improvement of the scheme, the slagging agent is Fe3O4、Al2O3、Li2CO3Composite oxide obtained after sintering, in which Fe3O4、Al2O3、Li2CO3The mass ratio of (A) to (B) is 4.5:2: 3.5.
As a further improvement of the scheme, the slagging agent is made of Fe3O4、Al2O3And Li2And (3) a composite oxide consisting of O.
As a further improvement of the scheme, the deoxidizer is a combined deoxidizer consisting of Al-Mg powder (aluminum-magnesium composite powder) and Ti, wherein the mass ratio of the Al-Mg powder (aluminum-magnesium composite powder) to the Ti is 2: 1.
As a further improvement of the scheme, the average particle size of the flux core powder is 100-150 μm; the grain size of the ferrite nano nucleating agent and the austenite nano nucleating agent is 50-80nm, and the purity is 99.9%.
As a further improvement of the scheme, the steel strip is an SUS430 steel strip, the size of the steel strip is 0.9 x 14mm, the filling rate of the flux-cored powder in the steel strip is 18.0-20.0%, and the diameter of the flux-cored wire is 1.2 mm.
The invention further provides a preparation method of the super duplex stainless steel self-protection flux-cored wire, which comprises the following steps:
(1) preparing a slagging agent:
according to Fe3O4:Al2O3:Li2CO3Mixing three kinds of powder with the particle size of 80-120 microns for 25-35 min according to the proportion of 4.5:2:3.5, fully mixing, sintering at 950 ℃ for 2-3 h, slowly cooling to room temperature, crushing a sintered product, and taking the sieved powder after 80-100 meshes for later use;
(2) preparing composite powder:
according to the nano nucleating agent: alloy powder: the mass ratio of the absolute ethyl alcohol is 1:10:1000, the ferrite nano nucleating agent and the chromium powder in the alloy powder are respectively added into an absolute ethyl alcohol solution, the solution is ultrasonically mixed for 1-3 hours, and after the absolute ethyl alcohol is slowly evaporated, the composite powder with the ferrite nano nucleating agent uniformly and dispersedly distributed on the chromium powder is obtained; respectively adding the austenite nano nucleating agent and the nickel powder in the alloy powder into an absolute ethyl alcohol solution, ultrasonically mixing the solution for 1-3 h, and slowly evaporating the absolute ethyl alcohol to obtain composite powder in which the austenite nano nucleating agent is uniformly dispersed on the nickel powder;
(3) preparing a flux core powder:
mixing the slagging agent prepared in the step (1), the composite powder prepared in the step (2), other metal powder in the alloy powder and a deoxidizer for 25-35 min;
(4) preparing a flux-cored wire:
and (4) filling the flux-cored powder prepared in the step (3) into a steel strip according to the required filling rate, and obtaining the flux-cored wire after multiple drawing.
As a further improvement of the above scheme, in the step (1), the mixing is carried out in a V-shaped powder mixer, and the sintering is carried out in an electric resistance furnace.
As a further improvement of the above scheme, in the step (2), the ultrasonic mixing is performed in an ultrasonic cleaning machine with the power of 2000W; in the step (4), the steel strip is subjected to ultrasonic cleaning before being filled with the flux core powder.
The super duplex stainless steel self-protection flux-cored wire has a ferrite-austenite duplex proportion of about 50%: 50 percent of fine-grained weld joint structure, and has high toughness, high strength and high corrosion resistance. The flux-cored wire consists of a sheath steel belt and flux-cored powder which is internally wrapped, the main alloy components are Cr, Ni, Mo, Si, Mn and V, and the added nano nucleating agents are CaS and La2O3、ZrO2MnS, according to the lattice mismatching degree theory and the classical electronic theory, the nano nucleating agents CaS and La which have obvious effect on ferrite heterogeneous nucleation2O3Nano nucleating agent ZrO with significant effect on austenite heterogeneous nucleation2And MnS. The added nano nucleating agent can play a remarkable role in heterogeneous nucleation in the solidification process of the duplex stainless steel weld joint structure, and the nano nucleating agent CaS or La plays a role in the solidification process2O3Firstly, inducing nucleation to generate equiaxed ferrite structure, and then in the austenite nucleating agentZrO2Or under the action of MnS, inducing an austenite structure with the shape of a nucleus and the like. By controlling the weight ratio of Cr to Ni to the nano nucleating agent to be Cr: ferrite nano nucleating agent 1:10, Ni: and (3) adjusting the composition and distribution of ferrite and austenite phases by the austenite nano nucleating agent to be 1:10, and finally obtaining the fine-grain super duplex stainless steel structure with high toughness, high strength and high corrosion resistance.
Compared with the prior art, the invention has the beneficial effects that:
1. adding CaS and La into metal Cr and Ni powder by ultrasonic dispersion2O3Nano nucleating agent and ZrO2The MnS nano nucleating agent can be respectively used as heterogeneous nucleation centers of ferrite and austenite structures in the process of solidification of weld metal to induce and generate fine equiaxed crystal structures.
2. By adjusting the contents of Cr and Ni and corresponding nano nucleating agents in weld metal, the directional regulation and control of a two-phase structure can be realized, and the obtained two-phase proportion is about 50%: 50% of fine-grain two-phase structure.
3. The grain refinement can change the diffusion behavior of metal elements and increase the diffusion path of Cr elements in the duplex stainless steel, thereby promoting the formation of a compact passive film and improving the overall corrosion resistance of the base material.
4. Added Fe3O4、Al2O3And Li2CO3The powder can form a lithium iron aluminate composite oxide after sintering, can fully protect a welding seam in the welding process, can further deoxidize the welding seam metal in the welding process, and can be easily removed on the surface of the welding seam metal in the welding seam solidification process due to the fact that the composite oxide is a spinel phase, and the slag adhesion phenomenon cannot be generated.
5. The Al-Mg and Ti combined deoxidizer has good deoxidizing effect on the welding seam, and the generated titanium-containing oxide is easy to act together with the composite oxide in the slag former to remove the deoxidized product from the welding seam metal, so that the welding seam structure is clean and compact.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1:
a super duplex stainless steel self-protection flux-cored wire adopts an SUS430 steel belt as a sheath, the size of the steel belt is 0.9 multiplied by 14mm, the filling rate of flux-cored powder in the steel belt is 18.0 percent, and the diameter of a wire material of the wire is 1.2 mm. The steel strip comprises the following chemical components in percentage by mass of 100 percent: 16.4% of Cr, 2.5% of Mo, 0.34% of Mn, 0.27% of Si, 0.14% of Ni and the balance of iron; the flux core powder is alloy powder and comprises the following chemical components: cr 5.0%, Ni 2.0%, V0.5%, N0.1%, Fe3O4-Al2O3-Li2CO34.0％、CaS 0.5％、ZrO20.2 percent of Al-Mg, 1.0 percent of Al-Mg, 0.5 percent of Ti and the balance of iron.
The average grain diameter of the flux core powder is 100-2The particle diameter of the product is 50-80nm, and the purity is 99.9%.
The preparation method of the super duplex stainless steel self-protection flux-cored wire comprises the following specific steps:
(1) preparing a slagging agent:
according to Fe3O4:Al2O3:Li2CO3Fully mixing three kinds of powder with the particle size of 100 mu m in a V-shaped mixer for 30min, adding the mixture into a stainless steel disc after fully mixing, placing the stainless steel disc into a resistance furnace, sintering the stainless steel disc at 950 ℃ for 2h, slowly cooling the stainless steel disc to room temperature, crushing a sintered product, and taking the sieved powder after 80-mesh sieving for later use;
(2) preparing composite powder:
according to the nano nucleating agent: alloy powder: the mass ratio of the absolute ethyl alcohol is 1:10:1000, the ferrite nano nucleating agent CaS and the metal chromium powder in the alloy powder are respectively added into the absolute ethyl alcohol solution, the solution is put into an ultrasonic cleaning machine with the power of 2000W for ultrasonic mixing for 1h, and after the absolute ethyl alcohol is slowly evaporated, the composite powder with the ferrite nano nucleating agent CaS uniformly and dispersedly distributed on the chromium powder is obtained; then proportionally adding the austenite nano nucleating agent ZrO2With alloy powderAdding the metal nickel powder into the anhydrous ethanol solution, putting the solution into an ultrasonic cleaning machine with the power of 2000W for ultrasonic mixing for 1h, and slowly evaporating the anhydrous ethanol to obtain the austenite nano nucleating agent ZrO2Composite powder evenly dispersed on the nickel powder;
(3) preparing a flux core powder:
adding the slagging agent prepared in the step (1), the composite powder containing the nano nucleating agent prepared in the step (2), other metal powder in the alloy powder and deoxidizers Al-Mg and T i into a V-shaped powder mixer according to a proportion, and mixing for 30 min;
(4) preparing a flux-cored wire:
and (4) filling the flux-cored powder prepared in the step (3) into an SUS430 steel strip subjected to ultrasonic cleaning according to the filling rate, and obtaining the flux-cored wire with the diameter of 1.2mm after multiple drawing.
Example 2:
a super duplex stainless steel self-protection flux-cored wire adopts an SUS430 steel belt as a sheath, the size of the steel belt is 0.9 multiplied by 14mm, the filling rate of flux-cored powder in the steel belt is 19.0 percent, and the diameter of a wire material of the wire is 1.2 mm. The steel strip comprises the following chemical components in percentage by mass of 100 percent: 16.0% of Cr, 2.0% of Mo, 0.30% of Mn, 0.25% of Si, 0.10% of Ni and the balance of iron; the flux core powder is alloy powder and comprises the following chemical components: cr 6.0%, Ni 3.0%, V0.5%, N0.15%, Fe3O4-Al2O3-Li2CO35.0％、CaS 0.6％、ZrO20.3 percent of Al-Mg 2.0 percent of Ti 1.0 percent and the balance of iron.
The average grain diameter of the flux core powder is 100-2The particle diameter of the product is 50-80nm, and the purity is 99.9%.
The preparation method of the super duplex stainless steel self-protection flux-cored wire comprises the following specific steps:
(1) preparing a slagging agent:
according to Fe3O4:Al2O3:Li2CO3Three powders with a particle size of 80 μm were thoroughly mixed in a V-blender at a ratio of 4.5:2:3.5Mixing for 25min, adding into a stainless steel plate after fully mixing, placing into a resistance furnace, sintering at 950 ℃ for 2h, slowly cooling to room temperature, crushing the sintered product, and taking the undersize powder after 90-mesh screening for later use;
(2) preparing composite powder:
according to the nano nucleating agent: alloy powder: the mass ratio of the absolute ethyl alcohol is 1:10:1000, the ferrite nano nucleating agent CaS and the metal chromium powder in the alloy powder are respectively added into the absolute ethyl alcohol solution, the solution is put into an ultrasonic cleaning machine with the power of 2000W for ultrasonic mixing for 2 hours, and after the absolute ethyl alcohol is slowly evaporated, the composite powder with the ferrite nano nucleating agent CaS uniformly and dispersedly distributed on the chromium powder is obtained; then proportionally adding the austenite nano nucleating agent ZrO2Adding the metal nickel powder and the alloy powder into an absolute ethyl alcohol solution, putting the solution into an ultrasonic cleaning machine with the power of 2000W for ultrasonic mixing for 2 hours, and obtaining an austenite nano nucleating agent ZrO after the absolute ethyl alcohol is slowly evaporated2Composite powder evenly dispersed on the nickel powder;
(3) preparing a flux core powder:
adding the slagging agent prepared in the step (1), the composite powder containing the nano nucleating agent prepared in the step (2), other metal powder in the alloy powder and deoxidizers Al-Mg and Ti into a V-shaped powder mixer according to a proportion, and mixing for 25 min;
(4) preparing a flux-cored wire:
and (4) filling the flux-cored powder prepared in the step (3) into an SUS430 steel strip subjected to ultrasonic cleaning according to the filling rate, and obtaining the flux-cored wire with the diameter of 1.2mm after multiple drawing.
Example 3:
a super duplex stainless steel self-protection flux-cored wire adopts an SUS430 steel belt as a sheath, the size of the steel belt is 0.9 multiplied by 14mm, the filling rate of flux-cored powder in the steel belt is 20.0%, and the diameter of a wire material of the wire is 1.2 mm. The steel strip comprises the following chemical components in percentage by mass of 100 percent: cr17.0%, Mo 3.0%, Mn 0.40%, Si 0.30%, Ni 0.20%, and the balance of Fe; the flux core powder is alloy powder and comprises the following chemical components: 8.0 percent of Cr, 4.0 percent of Ni and 1.0 percent of V、N 0.2％、Fe3O4-Al2O3-Li2CO36.0％、La2O30.8 percent of Mn, 0.4 percent of MnS, 2.0 percent of Al-Mg, 1.0 percent of Ti and the balance of iron.
The average grain diameter of the flux core powder is 100-150 mu m, and the nano nucleating agent La2O3The particle size of MnS is 50-80nm, and the purity is 99.9%.
The preparation method of the super duplex stainless steel self-protecting flux-cored wire comprises the following specific steps:
(1) preparing a slagging agent:
according to Fe3O4:Al2O3:Li2CO3Fully mixing three kinds of powder with the particle size of 120 mu m in a V-shaped mixer according to the proportion of 4.5:2:3.5, mixing the powder for 35min, adding the fully mixed powder into a stainless steel disc, placing the stainless steel disc into a resistance furnace, sintering the stainless steel disc at 950 ℃ for 3h, slowly cooling the stainless steel disc to room temperature, crushing a sintered product, and taking the sieved powder after 100 meshes for later use;
(2) preparing composite powder:
according to the nano nucleating agent: alloy powder: the absolute ethyl alcohol is in a mass ratio of 1:10:1000, and the ferrite nano nucleating agent La is respectively added2O3Adding the alloy powder and metal chromium powder in the alloy powder into an absolute ethyl alcohol solution, putting the solution into an ultrasonic cleaning machine with the power of 2000W for ultrasonic mixing for 3h, and slowly evaporating the absolute ethyl alcohol to obtain a ferrite nano nucleating agent La2O3Composite powder evenly dispersed on the chromium powder; adding the austenite nano nucleating agent MnS and the metal nickel powder in the alloy powder into an absolute ethyl alcohol solution according to a proportion, putting the solution into an ultrasonic cleaning machine with the power of 2000W, and ultrasonically mixing for 3h to obtain composite powder in which the austenite nano nucleating agent MnS is uniformly dispersed on the nickel powder after the absolute ethyl alcohol is slowly evaporated;
(3) preparing a flux core powder:
adding the slagging agent prepared in the step (1), the composite powder containing the nano nucleating agent prepared in the step (2), other metal powder in the alloy powder and deoxidizers Al-Mg and Ti into a V-shaped powder mixer according to a proportion, and mixing for 35 min;
(4) preparing a flux-cored wire:
and (4) filling the flux-cored powder prepared in the step (3) into an SUS430 steel strip subjected to ultrasonic cleaning according to the filling rate, and obtaining the flux-cored wire with the diameter of 1.2mm after multiple drawing.
Effect example 1:
the three super duplex stainless steel self-shielded flux-cored wires of examples 1-3 were used to perform weld metal welding tests, the sample preparation, the sampling standard, the mechanical property, the ferrite content, the corrosion resistance and other performance tests were performed according to the regulations of GB/T17853 and 2018, and the 2205 duplex stainless steel was used as a comparative example, and the test results are shown in the following table.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. The self-protection flux-cored wire for the super duplex stainless steel consists of a steel strip and flux-cored powder filled in the steel strip, and is characterized in that the steel strip comprises the following chemical components in percentage by mass of 100 percent: 16.0-17.0% of Cr16.0-3.0% of Mo2.0-3.0%, 0.30-0.40% of Mn0.25-0.30% of Si, 0.10-0.20% of Ni0.10-0.20% and the balance of Fe; the flux core powder is alloy powder, and comprises the following chemical components: 5.0 to 8.0 percent of Cr5.0 to 8.0 percent of Ni2.0 to 4.0 percent of V0.5 to 1.0 percent of N0.10 to 0.20 percent of N, 0.5 to 0.8 percent of ferrite nano nucleating agent, 0.2 to 0.4 percent of austenite nano nucleating agent, 4.0 to 6.0 percent of slagging agent, 1.5 to 3.0 percent of deoxidizer and the balance of iron.
2. The super duplex stainless steel self shielded flux cored welding wire of claim 1, wherein the wire is made of a metal selected from the group consisting of stainless steel, and stainless steel, and stainless steel, flux cored, stainless steel, and stainless steel, flux cored, stainless steel, and stainless steel, flux cored, and stainless steel, flux cored, and flux cored, and flux andthe ferrite nano nucleating agent is selected from CaS and La2O3Any one of, the austenite nano nucleating agent is selected from ZrO2And MnS.
3. The super duplex stainless steel self-shielded flux-cored wire of claim 1, wherein the slag former is Fe3O4、Al2O3、Li2CO3Composite oxide obtained after sintering, in which Fe3O4、Al2O3、Li2CO3The mass ratio of (A) to (B) is 4.5:2: 3.5.
4. The super duplex stainless steel self-shielded flux-cored wire of claim 3, wherein the slag former is composed of Fe3O4、Al2O3And Li2And (3) a composite oxide consisting of O.
5. The super duplex stainless steel self-shielded flux-cored wire of claim 1, wherein the deoxidizer is a combined deoxidizer consisting of Al-Mg powder and Ti, wherein the mass ratio of the Al-Mg powder to the Ti is 2: 1.
6. The super duplex stainless steel self-shielded flux-cored wire of claim 1, wherein the average particle size of the flux-cored powder is 100 to 150 μm; the grain size of the ferrite nano nucleating agent and the austenite nano nucleating agent is 50-80nm, and the purity is 99.9%.
7. The super duplex stainless steel self-shielded flux-cored wire according to claim 1, wherein the steel strip is an SUS430 steel strip, the size of the steel strip is 0.9 x 14mm, the filling ratio of the flux-cored powder in the steel strip is 18.0 to 20.0%, and the diameter of the wire of the flux-cored wire is 1.2 mm.
8. A method for preparing the super duplex stainless steel self-shielded flux-cored wire according to any one of claims 1 to 7, comprising the steps of:
(1) preparing a slagging agent:
according to Fe3O4:Al2O3:Li2CO3Mixing three kinds of powder with the particle size of 80-120 microns for 25-35 min according to the proportion of 4.5:2:3.5, fully mixing, sintering at 950 ℃ for 2-3 h, slowly cooling to room temperature, crushing a sintered product, and taking the sieved powder after 80-100 meshes for later use;
(2) preparing composite powder:
according to the nano nucleating agent: alloy powder: the mass ratio of the absolute ethyl alcohol is 1:10:1000, the ferrite nano nucleating agent and the chromium powder in the alloy powder are respectively added into an absolute ethyl alcohol solution, the solution is ultrasonically mixed for 1-3 hours, and after the absolute ethyl alcohol is slowly evaporated, the composite powder with the ferrite nano nucleating agent uniformly and dispersedly distributed on the chromium powder is obtained; respectively adding the austenite nano nucleating agent and the nickel powder in the alloy powder into an absolute ethyl alcohol solution, ultrasonically mixing the solution for 1-3 h, and slowly evaporating the absolute ethyl alcohol to obtain composite powder in which the austenite nano nucleating agent is uniformly dispersed on the nickel powder;
(3) preparing a flux core powder:
mixing the slagging agent prepared in the step (1), the composite powder prepared in the step (2), other metal powder in the alloy powder and a deoxidizer for 25-35 min;
(4) preparing a flux-cored wire:
and (4) filling the flux-cored powder prepared in the step (3) into a steel strip according to the required filling rate, and obtaining the flux-cored wire after multiple drawing.
9. The production method according to claim 7, wherein in the step (1), the mixing is performed in a V-type powder mixer, and the sintering is performed in an electric resistance furnace.
10. The production method according to claim 7, wherein in the step (2), the ultrasonic mixing is performed in an ultrasonic cleaning machine having a power of 2000W; in the step (4), the steel strip is subjected to ultrasonic cleaning before being filled with the flux core powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110995440.5A CN113714682B (en) | 2021-08-27 | 2021-08-27 | Super duplex stainless steel self-protection flux-cored wire and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110995440.5A CN113714682B (en) | 2021-08-27 | 2021-08-27 | Super duplex stainless steel self-protection flux-cored wire and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113714682A true CN113714682A (en) | 2021-11-30 |
| CN113714682B CN113714682B (en) | 2022-07-01 |
Family
ID=78678496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110995440.5A Active CN113714682B (en) | 2021-08-27 | 2021-08-27 | Super duplex stainless steel self-protection flux-cored wire and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113714682B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114589429A (en) * | 2022-03-31 | 2022-06-07 | 广东省科学院中乌焊接研究所 | Super duplex stainless steel flux-cored wire for impeller additive repair and preparation method and application thereof |
| CN114833489A (en) * | 2022-04-29 | 2022-08-02 | 广东省科学院中乌焊接研究所 | Flux-cored wire for manufacturing super corrosion-resistant super duplex stainless steel by electric arc additive manufacturing and preparation method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101157160A (en) * | 2007-04-20 | 2008-04-09 | 北京工业大学 | A flux-cored wire for soldering diphasic stainless steel |
| CN101164731A (en) * | 2006-10-20 | 2008-04-23 | 基斯韦尔株式会社 | Flux cored wire for duplex stainless steel and method of manufacturing the same |
| CN102046325A (en) * | 2008-05-27 | 2011-05-04 | 新日铁住金不锈钢株式会社 | Flux-cored wire for welding of duplex stainless steel which enables the miniaturization of solidified crystal particles |
| CN102267023A (en) * | 2011-07-29 | 2011-12-07 | 台州海翔焊接材料有限公司 | Metal-powder type stainless steel flux-cored wire |
| CN104690445A (en) * | 2015-02-12 | 2015-06-10 | 西安理工大学 | Metal flux-cored wire for 2505 duplex stainless steel, and preparation method of metal flux-cored wire |
| CN106271194A (en) * | 2015-05-12 | 2017-01-04 | 海宁瑞奥金属科技有限公司 | Nickel-saving type phase stainless steel use flux-cored wire |
| JP2017131912A (en) * | 2016-01-26 | 2017-08-03 | 日鐵住金溶接工業株式会社 | Flux-cored wire for two-phase stainless steel welding |
-
2021
- 2021-08-27 CN CN202110995440.5A patent/CN113714682B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101164731A (en) * | 2006-10-20 | 2008-04-23 | 基斯韦尔株式会社 | Flux cored wire for duplex stainless steel and method of manufacturing the same |
| CN101157160A (en) * | 2007-04-20 | 2008-04-09 | 北京工业大学 | A flux-cored wire for soldering diphasic stainless steel |
| CN102046325A (en) * | 2008-05-27 | 2011-05-04 | 新日铁住金不锈钢株式会社 | Flux-cored wire for welding of duplex stainless steel which enables the miniaturization of solidified crystal particles |
| CN102267023A (en) * | 2011-07-29 | 2011-12-07 | 台州海翔焊接材料有限公司 | Metal-powder type stainless steel flux-cored wire |
| CN104690445A (en) * | 2015-02-12 | 2015-06-10 | 西安理工大学 | Metal flux-cored wire for 2505 duplex stainless steel, and preparation method of metal flux-cored wire |
| CN106271194A (en) * | 2015-05-12 | 2017-01-04 | 海宁瑞奥金属科技有限公司 | Nickel-saving type phase stainless steel use flux-cored wire |
| JP2017131912A (en) * | 2016-01-26 | 2017-08-03 | 日鐵住金溶接工業株式会社 | Flux-cored wire for two-phase stainless steel welding |
Non-Patent Citations (1)
| Title |
|---|
| 李伟等: "双相不锈钢药芯焊丝GDQA2205的研制", 《焊接学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114589429A (en) * | 2022-03-31 | 2022-06-07 | 广东省科学院中乌焊接研究所 | Super duplex stainless steel flux-cored wire for impeller additive repair and preparation method and application thereof |
| CN114589429B (en) * | 2022-03-31 | 2022-08-30 | 广东省科学院中乌焊接研究所 | Super duplex stainless steel flux-cored wire for impeller additive repair and preparation method and application thereof |
| CN114833489A (en) * | 2022-04-29 | 2022-08-02 | 广东省科学院中乌焊接研究所 | Flux-cored wire for manufacturing super corrosion-resistant super duplex stainless steel by electric arc additive manufacturing and preparation method thereof |
| CN114833489B (en) * | 2022-04-29 | 2022-12-09 | 广东省科学院中乌焊接研究所 | Flux-cored wire for manufacturing super corrosion-resistant super duplex stainless steel by electric arc additive manufacturing and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113714682B (en) | 2022-07-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2295197B1 (en) | Flux-cored wire for welding of duplex stainless steel which enables the miniaturization of solidified crystal particles | |
| CN113714682B (en) | Super duplex stainless steel self-protection flux-cored wire and preparation method thereof | |
| CN104400250B (en) | A kind of flux-cored | |
| CN102658442B (en) | Low-alloy steel welding electrode with Cr control capacity and FAC resisting capacity of weld metal of basic slag system | |
| CN108971795B (en) | Electric welding rod for high-manganese austenite low-temperature steel | |
| CN104959748A (en) | Flux-cored wire special for maritime work low-temperature high-strength steel | |
| CN111975244B (en) | Coating-free weather-resistant steel bridge CO with 650 MPa-grade tensile strength2Gas shielded welding wire and wire rod | |
| CN105689918A (en) | Welding core and coating of rare earth treated 830 MPa grade low-alloy, high-strength and high-toughness basic electrode and preparation method thereof | |
| KR20090012045A (en) | Weld metal and titania-based flux cored wire | |
| CN107921590A (en) | Flux-cored wire for gas-shielded arc welding | |
| CN112247398B (en) | Low-hydrogen easy-to-weld alkaline flux-cored wire for structural steel prepared from steel slag | |
| JP2012115877A (en) | Flux-cored wire | |
| CN110560681B (en) | Metal type powder core wire material, preparation method and application | |
| CN110253172A (en) | A kind of high-strength steel Ar-CO2Metal powder core solder wire used for gas shield welding | |
| JP2003136280A (en) | Flux cored wire for welding austenitic stainless steel refining solidified crystal grain | |
| CN107598409A (en) | Gas shielded solid welding wire and preparation method for yield strength 460MPa steel | |
| CN104708227B (en) | Self-protection flux-cored wire for low-temperature steel 1Ni9 and preparing method for self-protection flux-cored wire | |
| CN113828960A (en) | Welding material and welding method for butt welding of copper-steel composite plates | |
| CN117415513A (en) | Welding wire for welding heat-resistant steel-stainless steel dissimilar materials and preparation method thereof | |
| JP3860437B2 (en) | Iron-based consumable welding materials and welded joints with excellent fatigue strength at welded joints | |
| JPH044079B2 (en) | ||
| CN101318267B (en) | Flux-cored wire for vertical electro-gas welding | |
| CN108544126A (en) | WH80 and 20Mn23Al gas-shielded flux-cored wires and preparation method thereof | |
| JP5473371B2 (en) | Coated arc welding rod for duplex stainless steel welding to refine solidified crystal grains | |
| JP2002361481A (en) | Iron based consumable welding material having excellent fatigue strength in welded joint part and welded joint |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |