CN111790999A - Flux combination of metal powder core submerged arc welding wire for 25Mn austenitic steel - Google Patents
Flux combination of metal powder core submerged arc welding wire for 25Mn austenitic steel Download PDFInfo
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- CN111790999A CN111790999A CN202010599845.2A CN202010599845A CN111790999A CN 111790999 A CN111790999 A CN 111790999A CN 202010599845 A CN202010599845 A CN 202010599845A CN 111790999 A CN111790999 A CN 111790999A
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- flux
- metal powder
- welding wire
- submerged arc
- welding
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Classifications
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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
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—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
- B23K35/3602—Carbonates, basic oxides or hydroxides
-
- 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
- B23K35/362—Selection of compositions of fluxes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
The invention discloses a flux combination of a metal powder core submerged arc welding wire for 25% manganese austenitic steel, wherein the metal powder core submerged arc welding wire is made of a steel strip sheath and a flux coated in the steel strip sheath, and comprises C, Cr, Mn, Si, Ni, Mo, P + S and rare metals; the flux comprises metal fluoride, MgO, Al2O3、SiO2、CaO、TiO2And MnO. The combination of the metal powder-cored welding wire and the welding flux has excellent slag removal and attractive appearance, and is matched with the joint strength and low-temperature impact of a welding seam of the 25% manganese austenitic low-temperature steel base material after welding.
Description
Technical Field
The invention belongs to the field of welding materials, and particularly relates to a flux combination of a metal powder core submerged arc welding wire for 25Mn austenitic steel.
Background
In recent years, due to the increasing demand for clean and efficient alternative energy sources such as Liquid Natural Gas (LNG) around the world, research and development on transportation and storage thereof have been increasingly completed. Including aluminum alloys, Invar, 304 stainless steel, and 9Ni steel, are widely used in the transportation or storage of LNG. 9Ni steel is currently used more in cryogenic storage tanks at-196 ℃ due to its relatively low cost and high tensile strength compared to the other 3 materials. But to save costs even further, the development of high manganese steels (25% manganese austenitic low temperature steels) is a viable alternative. The reason is that the carbon and manganese steel materials are all stable elements of austenite, and the formed austenite high manganese steel has good impact toughness and tensile strength at the storage temperature of-196 ℃.
The nickel-based alloy (Ni-Cr-Mo) welding material can be used for welding high manganese steel (25% manganese austenite low temperature steel), but the cost is high. A better alternative is to provide a wire that is closer to the base material composition.
In the invention of patent CN109530881A, the alkaline flux contains MgO and Al as the components2O3Mainly, solid welding wires with the Mn of more than 13 percent are matched. However, the higher the manganese content of the flux, the more severe the work hardening degree thereof, which is disadvantageous for the finish drawing process.
The patent CN107186382A uses the production process of metal powder core, and also describes that the excellent low-temperature toughness, strength and plasticity of the formed welding seam are matched with the ultralow-temperature high manganese steel. However, the welding process of the invention is argon tungsten-arc welding, which cannot be applied to submerged arc welding.
The submerged arc welding process is to bury the welding wire generating the electric arc in the welding flux, and in the welding process, the welding wire, the welding flux and the base metal are melted to form a molten pool and protective slag. The welding wire penetrates through slag formed by melting the welding agent, so that a molten pool is isolated and protected from being polluted by external atmosphere, the formation of a welding bead is improved, and possible welding bead defects are eliminated. The composition and mechanical properties of the weld bead depend on the composition of the wire and flux. Therefore, the welding wire and the welding flux are combined and matched with 25Mn austenitic steel, and the submerged arc process is adopted to enable the welding joint to achieve the expected welding bead forming and mechanical properties.
Disclosure of Invention
In order to solve the technical problems, the invention provides a flux combination of a metal powder core submerged arc welding wire for 25Mn austenitic steel, which is suitable for submerged arc process welding of a high manganese steel (25% manganese austenitic low-temperature steel) LNG storage tank, and a joint welding seam formed by welding meets the requirements of the LNG storage tank on strength and low-temperature impact, can be well matched with a base metal, and saves cost.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows: a flux combination of a metal powder core submerged arc welding wire for 25Mn austenitic steel is disclosed, wherein the metal powder core submerged arc welding wire consists of a steel strip sheath and a flux coated in the steel strip sheath, and the metal powder core submerged arc welding wire comprises the following components in percentage by weight: 0.45% -0.65%, Cr: 1.8% -2.3%, Mn: 18.5-19.5%, Si < 0.5%, Ni: 4% -6%, Mo: 0.8 to 1.2 percent of iron, less than 0.010 percent of P + S, 0.05 to 0.12 percent of rare metal and the balance of iron; the welding flux comprises the following components in percentage by weight: metal fluoride in terms of F: 15-30%, MgO: 2 to 10% of Al2O3：7～20％、SiO2：10～30％、CaO：20～45％、TiO2: 1.5% or less, MnO: 0.5-3% and blending to 100% of the total amount.
Preferably, the metal powder core submerged arc welding wire comprises the following components in percentage by weight: 0.45% -0.55%, Cr: 1.9% -2.0%, Mn: 19-19.5%, Si < 0.4%, Ni: 4% -5.5%, Mo: 0.8 to 1.2 percent of iron, less than 0.008 percent of P and S, 0.06 to 0.1 percent of rare metal and the balance of iron; the welding flux comprises the following components in percentage by weight: metal fluoride in F equivalent: 20-35%, MgO: 5 to 12% of Al2O3：10～17％、SiO2： 20～30％、CaO：20～40％、TiO2: 1.3% or less, MnO: 1-2%, and the balance unavoidable impurities.
Wherein the flux filling ratio is 30-35% of the total welding wire.
Wherein the rare metal is an alloy, fluoride or oxide of Y, La and Ce elements.
Wherein the metal fluoride may be CaF2、BaF2、SrF2、AlF3Or any combination thereof.
Wherein, the welding polarity is direct current reverse connection DCEP.
C. Mn and Ni are both austenite stabilizing elements, and in the numerical range, the weld joint structure can be solidified from a molten pool, and is stabilized to room temperature by an austenite base, and meanwhile, the weld joint of the steel is ensured to have equivalent mechanical strength and 196 ℃ low-temperature impact value.
Cr and Mo can prevent the weld joint from generating hot cracks when being solidified, can improve the strength of the weld joint, and can reduce the low-temperature impact toughness if excessive.
Excessive Si lowers the low-temperature impact toughness, so that Si is controlled to less than 0.5%.
P and S cause heat cracks in the austenitic weld, so that the generation of heat cracks is reduced by controlling P + S to be less than 0.010%.
The rare metal is alloy, fluoride or oxide synthesized by Y, La and Ce elements, the content of the rare metal is the weight proportion of the rare metal after being replaced by the Y, La and Ce elements, and the rare metal is added for improving the low-temperature impact value.
In the composition of the flux, the metal fluoride may be CaF2、BaF2、SrF2、AlF3Or a combination of several thereof, which is primarily a slag former, and which has the effect of lowering the melting point of the slag, increasing the fluidity and improving the shape of the weld bead. In addition, these fluorides also reduce the S and hydrogen content of the weld metal. When the content is too low, the above-mentioned effects cannot be obtained. On the other hand, if the content is too high, the arc may be unstable, and a defect such as a crater may be formed on the bead surface, resulting in poor bead formation.
MgO has the effect of adjusting the viscosity of the slag and improving the shape of the weld bead, and can improve the slag removability. If the content is too low, the above-mentioned effects cannot be obtained. When the content is too high, the melting point of the flux becomes too high to cause the flux to be more difficult to melt, resulting in deterioration of the bead surface shape.
Al2O3The concentration and stability of the electric arc are improved, and the melting point of the welding slag is improved to adjust the fluidity, thereby improving the shape of the welding bead. If the content is too low, the above-mentioned effects cannot be obtained. If the content is too high, problems such as slag adhesion tend to occur on the bead.
CaO has the effect of adjusting the viscosity of the slag and improving the shape of the weld bead. If the content is too low, the above-mentioned effects cannot be obtained. When the content is too high, the melting point of the flux becomes high, causing difficulty in melting the flux and deterioration in the bead surface shape.
SiO2The viscosity of the welding slag is increased, and the wettability of the welding bead edge is improved. When the content is too large, the melting point of the slag is lowered and the surface shape of the bead is deteriorated, and the slag becomes too brittle to be usedThe method can continuously and uniformly strip. In the production of the flux, SiO in water glass is added as a binder for the purpose of shaping and granulating the flux2Are also included.
TiO2Has the function of improving the cladding property of the welding slag. When the content is too high, slag adhesion may occur.
MnO has the effect of adjusting the viscosity of the welding slag and improving the shape of the welding bead. If the content is too low, the above-mentioned effects cannot be obtained. When the content is too large, the melting point of the slag is lowered and the shape of the bead surface is deteriorated.
The metal powder-cored welding wire and the welding flux combination are used for welding a joint formed by high manganese steel (25% manganese austenite low-temperature steel), welding slag can be easily removed, a welding bead is attractive in shape, the defects of biting, pores and incomplete fusion are avoided, and the mechanical properties of the welding joint can be matched with those of a base metal.
The alkaline flux of the above patent CN109530881A contains MgO and Al as the components2O3Mainly, when the solid welding wire with 13% Mn or more is matched with the welding wire, the work hardening degree is more serious when the manganese content ratio is increased, which is not beneficial to the fine drawing process. The flux of the invention takes fluoride as the main component, CaO is inferior, and the type of the welding wire is matched as the metal powder core welding wire, Mn in the metal powder core welding wire is coated in the steel strip sheet in the mode of metal powder, thus the processing is not influenced by alloy components, and the invention is more beneficial to the processing technology.
The invention uses the metal powder-cored welding wire and the flux in combination, has excellent slag removal and attractive formation when the submerged arc process welding is carried out, the joint welding seam formed by welding meets the requirements of the strength and the low-temperature impact of the LNG storage tank, and is matched with the joint strength (the tensile sheet strength is more than 690MPa) and the low-temperature impact (-196 ℃ Charpy impact value is more than 41J) of the welding seam after the base material 25% manganese austenite low-temperature steel is welded, thereby being particularly suitable for the submerged arc welding of the 25% manganese austenite low-temperature steel.
Detailed Description
The technical solution of the present invention will be further described with reference to the following specific examples, but the present invention is not limited to these examples.
The metal powder-cored welding wire consists of a steel strip outer skin and welding flux coated in the steel strip outer skin, and is manufactured by the steps of firstly forming a steel strip with the components shown in the table 1 into a U shape through a roller, then uniformly paving the welding flux in a groove of the U-shaped steel strip according to the proportion of 30-35% of the filling ratio, and finally stretching the wire to the required wire diameter through a wire stretching process.
The production steps of the welding flux are that the raw materials are dry mixed according to the specified proportion, then the water glass is added for wet mixing granulation, then the pre-drying is carried out at 110 ℃, the low-temperature drying is carried out at 350 ℃, finally the high-temperature sintering is carried out at 650 ℃, then the screening is carried out, and then the welding flux is matched with the metal powder core welding wire for the test plate welding.
TABLE 1
And (3) inspecting whether solidification cracks exist in the welding process, performing side bending (4T: 10mm) on the joint after welding, and performing summer impact (10mm multiplied by 55mm) at the temperature of-196 ℃ and side expansion amount on the tensile sheet. The test welding condition arrangement is shown in table 2, the composition and performance of the base material 25% manganese austenite low temperature steel are shown in table 3, the composition of each example and comparative example of the invention is shown in table 4, and the test results are shown in table 5.
TABLE 2
| Base material | 25% manganese Austenitic Low temperature Steel (composition and mechanical Properties as in Table III) |
| Groove form | Thickness: 20mm, blunt edge: single side of 4mm V-shaped groove 30 degree |
| Specification of welding wire | Φ3.2mm |
| Polarity of welding | DCEP |
| Welding current | 420～450A |
| Welding voltage | 28～30V |
| Speed of welding | 380～420mm/min |
| Stretching of the stems | 25mm |
| Road temperature | 150±5℃ |
Base material: 25Mn austenitic low temperature steel (composition and mechanical properties as in table 3).
TABLE 3
TABLE 5
O: no solidification crack, no side bending crack, tensile strength of more than 690MPa or fracture in a base material, Charpy impact at-196 ℃ of more than 41J, side expansion of more than 0.38, good slag removal and forming;
●: the steel has condensed cracks and side bending cracks, the tensile strength is lower than 690MPa, the steel is broken at a welding seam, the Charpy impact at minus 196 ℃ is less than 41J, the side expansion is less than 0.38, the slag is difficult to remove, and the forming is poor;
the metal powder-cored welding wire and the welding flux combination of the invention can be used for welding a joint formed by high manganese steel (25% manganese austenite low-temperature steel), welding slag can be easily removed, a welding bead is attractive in forming, the welding bead has no defects of undercut, air holes and incomplete fusion, the mechanical properties of the welding joint can be matched with those of a base material, the joint welding seam formed by welding meets the requirements of LNG storage tank strength and low-temperature impact, and the joint strength (the tensile strength is more than 690MPa) of the welding seam after the welding with the 25% manganese austenite low-temperature steel of the base material is matched with that of the low-temperature impact (-196 ℃ Charpy impact value is more than 41J), so that the welding flux combination is particularly suitable for submerged arc welding of the 25% manganese austenite low-temperature steel.
Claims (6)
1. The flux combination of the metal powder core submerged arc welding wire for the 25Mn austenitic steel is characterized in that the metal powder core submerged arc welding wire consists of a steel strip sheath and a flux coated in the steel strip sheath, and the metal powder core submerged arc welding wire comprises the following components in percentage by weight: c: 0.45% -0.65%, Cr: 1.8% -2.3%, Mn: 18.5-19.5%, Si < 0.5%, Ni: 4% -6%, Mo: 0.8 to 1.2 percent of iron, less than 0.010 percent of P + S, 0.05 to 0.12 percent of rare metal and the balance of iron; the welding flux matched with the welding wire comprises the following components in percentage by weight: metal fluoride in terms of F: 10-40%, MgO: 2 to 15% of Al2O3：7～20％、SiO2：10～35％、CaO：15～45％、TiO2: 1.5% or less, MnO: 0.5-3%, and the balance unavoidable impurities.
2. The flux combination of a metal powder cored submerged arc welding wire for 25Mn austenitic steel according to claim 1, characterized in that the metal powder cored submerged arc welding wire comprises the following compositions in weight percentage C: 0.45% -0.55%, Cr: 1.9% -2.0%, Mn: 19-19.5%, Si < 0.4%, Ni: 4% -5.5%, Mo: 8 to 1.2 percent of iron, less than 0.008 percent of P and S, 0.06 to 0.1 percent of rare metal and the balance of iron; by weightThe flux comprises the following components in percentage: metal fluoride in terms of F: 20-35%, MgO: 5 to 12% of Al2O3：10～17％、SiO2：20～30％、CaO：20～40％、TiO2: 1.3% or less, MnO: 1-2%, and the balance unavoidable impurities.
3. The flux combination of a metal powder cored submerged arc welding wire for 25Mn austenitic steel according to claim 1 or 2, characterized in that the flux fill ratio is 30-35% of full wire.
4. The metal powder cored submerged arc welding flux combination for 25Mn austenitic steel according to claim 1 or 2, characterized in that the rare metals are alloys, fluorides or oxides of Y, La, Ce elements.
5. A flux combination for a metal powder cored submerged arc welding wire for austenitic steel of 25Mn according to claim 1 or 2, characterized in that the metal fluoride may be CaF2、BaF2、SrF2、AlF3Or any combination thereof.
6. The flux combination of a metal powder cored submerged arc welding wire for 25Mn austenitic steel according to claim 1 or 2, characterized in that the welding polarity is dc reverse welding DCEP.
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| CN202010599845.2A CN111790999A (en) | 2020-06-28 | 2020-06-28 | Flux combination of metal powder core submerged arc welding wire for 25Mn austenitic steel |
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| CN202010599845.2A CN111790999A (en) | 2020-06-28 | 2020-06-28 | Flux combination of metal powder core submerged arc welding wire for 25Mn austenitic steel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112518083A (en) * | 2020-10-23 | 2021-03-19 | 南京钢铁股份有限公司 | Submerged-arc welding method for high-manganese austenitic steel K-shaped groove at low temperature |
| CN112846464A (en) * | 2021-01-04 | 2021-05-28 | 南京钢铁股份有限公司 | Submerged-arc welding method for high-manganese austenitic steel used at low temperature |
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| CN111185652A (en) * | 2020-03-14 | 2020-05-22 | 昆山京群焊材科技有限公司 | Austenitic stainless steel submerged arc welding flux |
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2020
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| JPS5781994A (en) * | 1980-11-06 | 1982-05-22 | Kobe Steel Ltd | Submerged arc welding method for low temperature steel |
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| CN105813799A (en) * | 2013-12-06 | 2016-07-27 | Posco公司 | High-strength welding joint having excellent cryogenic impact toughness, and wire for flux-cored arc welding therefor |
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|---|---|---|---|---|
| CN112518083A (en) * | 2020-10-23 | 2021-03-19 | 南京钢铁股份有限公司 | Submerged-arc welding method for high-manganese austenitic steel K-shaped groove at low temperature |
| CN112846464A (en) * | 2021-01-04 | 2021-05-28 | 南京钢铁股份有限公司 | Submerged-arc welding method for high-manganese austenitic steel used at low temperature |
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Application publication date: 20201020 |