CN114289931A - Solid welding wire for submerged arc transverse welding of high-manganese austenitic low-temperature steel and welding process thereof - Google Patents
Solid welding wire for submerged arc transverse welding of high-manganese austenitic low-temperature steel and welding process thereof Download PDFInfo
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- 238000003466 welding Methods 0.000 title claims abstract description 268
- 239000010959 steel Substances 0.000 title claims abstract description 76
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 75
- 239000011572 manganese Substances 0.000 title claims abstract description 70
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 67
- 239000007787 solid Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000008569 process Effects 0.000 title claims abstract description 38
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000000126 substance Substances 0.000 claims abstract description 21
- 239000012535 impurity Substances 0.000 claims abstract description 8
- 229910001566 austenite Inorganic materials 0.000 claims description 36
- 230000004907 flux Effects 0.000 claims description 11
- 238000003723 Smelting Methods 0.000 claims description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 238000005242 forging Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 45
- 239000002184 metal Substances 0.000 abstract description 45
- 239000000779 smoke Substances 0.000 abstract description 8
- 239000003949 liquefied natural gas Substances 0.000 description 10
- 238000005728 strengthening Methods 0.000 description 10
- 229910052717 sulfur Inorganic materials 0.000 description 10
- 229910052698 phosphorus Inorganic materials 0.000 description 8
- 238000003860 storage Methods 0.000 description 8
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 239000006104 solid solution Substances 0.000 description 6
- 229910000617 Mangalloy Inorganic materials 0.000 description 5
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- 238000005516 engineering process Methods 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 4
- 229910001338 liquidmetal Inorganic materials 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 239000011593 sulfur Substances 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000036541 health Effects 0.000 description 3
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- 229910052750 molybdenum Inorganic materials 0.000 description 2
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- 238000005204 segregation Methods 0.000 description 2
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
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Abstract
The invention relates to a solid welding wire for submerged arc transverse welding of high-manganese austenitic low-temperature steel and a welding process thereof. The technical scheme is as follows: the solid welding wire for submerged-arc transverse welding of the high-manganese austenitic low-temperature steel comprises the following chemical components: c is 0.20-0.60 wt%; si is less than or equal to 0.05 wt%; mn is 20-32 wt%; ni is 0.1-2 wt%; 0.1-1.8 wt% of Cr; cu is 0.55-1.00 wt%; w is 0.5-1.9 wt%; mo accounts for 1.3-3.0 wt%; 0.5-2 wt% of Al; nb + V + Ti + B + RE is 0-0.5 wt%; p is less than or equal to 0.002 wt%; s is less than or equal to 0.001 wt%; the balance being Fe and unavoidable impurities. The welding process of the solid welding wire for the submerged-arc transverse welding of the high-manganese austenitic low-temperature steel sequentially comprises backing welding, filling welding and cover surface welding. The invention is used for welding at the transverse welding position, and has the characteristics of full-automatic welding, high welding efficiency, no welding smoke, good weld metal forming and excellent mechanical property; the formed weld metal has excellent low-temperature toughness and strength matched with high manganese austenitic low-temperature steel.
Description
Technical Field
The invention belongs to the technical field of solid welding wires for submerged arc transverse welding. In particular to a solid welding wire for submerged arc transverse welding of high manganese austenite low temperature steel and a welding process thereof.
Background
In recent years, with the rapid development of clean energy of liquefied natural gas (abbreviated as LNG, the same applies hereinafter), LNG storage and transportation equipment (with a service temperature of-196 ℃) presents an unprecedented great demand. At present, the commercial LNG storage tank steel is 9Ni steel and is expensive, so that the development and development of novel low-temperature steel become important directions of all countries in the world. The high manganese steel with the manganese content of 22-25% has the same physical metallurgy characteristics with nickel, and the stacking fault energy of the high manganese steel is controlled to be 22-24 mJ/m by adding other alloy elements2Above that, the microstructure is still stable austenite under the ultralow temperature condition of-196 DEG CTherefore, the excellent comprehensive mechanical property under the ultralow temperature condition is ensured, and the mechanical property of the high-manganese austenite low-temperature steel is equivalent to that of 9Ni steel, so that the high-manganese austenite low-temperature steel becomes a novel low-temperature steel material which has strong competitiveness in the future and is used for LNG storage and transportation equipment instead of the 9Ni steel.
The welding material and the welding process matched with the high manganese austenite low temperature steel are one of key technologies for preparing LNG storage and transportation equipment, and determine the integrity of the whole structure and the safety of operation. In the prior art:
a low-hydrogen type welding rod (CN201910008172.6) for manual electric arc welding of high-manganese austenitic low-temperature steel discloses a manual electric welding rod matched with the high-manganese low-temperature steel, and the manual electric welding rod can realize all-position welding, but all adopts manual operation, so that the labor intensity is high, the labor cost is high, and the welding efficiency is low; the amount of dust generated by the welding rod is large, which is not good for the health of welders.
A technology FOR welding high-manganese ultralow-temperature steel wires and welding processes thereof (CN201710432013.X), a technology FOR welding solid welding wires FOR argon TUNGSTEN-arc welding FOR ultralow-temperature high-manganese steel (CN201710194207.0) and a technology FOR welding TUNGSTEN INERT GAS WELDING MATERIAL FOR HIGH MANGANESE STEEL (KR20140188144) disclose three welding wires and welding processes FOR argon TUNGSTEN-arc welding matched with high-manganese austenitic low-temperature steel.
A full-automatic submerged-arc welding wire and flux for welding high-manganese austenitic low-temperature steel are disclosed, which can only realize flat welding position (CN202010993137.7) in submerged-arc weldingAnd (5) welding. HIGH STRENGTH WELDING JOINT HAVING EXCELLENT IMPACT TOUGHNESS AT VERY LOW TEMPERATURE, AND FLUX-CORED ARC WELDING WIRE THEREFOR (US201816189232) patent technology AND a consumable electrode gas shielded welding metal powder core FLUX-CORED wire (CN201910008171.1) for ultralow TEMPERATURE high manganese steel disclose CO for high manganese LOW TEMPERATURE steel2Or CO2Though the flux-cored wire and the solid-cored wire protected by the Ar mixed gas can realize all-position high-efficiency welding, the flux-cored wire and the solid-cored wire have the problems of large smoke dust, large splashing, poor weld metal forming, low mechanical property and the like.
In the process of building the LNG storage tank, a relatively long transverse welding seam cannot be avoided. When manual electric arc welding and tungsten electrode argon arc welding are adopted, the problems of low welding efficiency and incapability of realizing automation exist; when submerged arc welding is adopted, full-automatic welding of a transverse welding position cannot be realized; in the presence of CO2Or CO2The flux-cored wire and the solid-cored wire protected by the Ar mixed gas have the problems of large smoke dust, large splashing, poor forming and low mechanical property of weld metal.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides the solid welding wire for the submerged arc transverse welding of the high manganese austenite low-temperature steel, which can realize full-automatic welding, has high welding efficiency, no welding smoke, good weld metal forming property and excellent mechanical property, and the welding process thereof; the formed weld metal has excellent low-temperature toughness and strength matched with high-manganese austenitic low-temperature steel, and can meet the technical requirements of strength and ultralow-temperature toughness of an LNG storage tank at the working temperature of-196 ℃.
In order to achieve the purpose, the invention adopts the technical scheme that:
the solid welding wire for submerged-arc transverse welding of the high-manganese austenitic low-temperature steel comprises the following chemical components: c is 0.20-0.60 wt%; si is less than or equal to 0.05 wt%; mn is 20-32 wt%; ni is 0.1-2 wt%; 0.1-1.8 wt% of Cr; cu is 0.55-1.00 wt%; w is 0.5-1.9 wt%; mo accounts for 1.3-3.0 wt%; 0.5-2 wt% of Al; nb + V + Ti + B + RE is 0-0.5 wt%; p is less than or equal to 0.002 wt%; s is less than or equal to 0.001 wt%; the balance being Fe and unavoidable impurities.
The preparation method of the solid welding wire for the submerged arc transverse welding of the high manganese austenite low temperature steel comprises the following steps: smelting, forging, rolling, heat treating, drawing, surface treating and winding according to the chemical components of the solid welding wire for submerged arc transverse welding to prepare the solid welding wire for the submerged arc transverse welding of the high manganese austenite low-temperature steel.
The solid welding wire for submerged arc transverse welding of the high manganese austenite low-temperature steel has a diameter of 2.0-3.2 mm.
The flux matched with the solid welding wire for the submerged-arc transverse welding of the high-manganese austenitic low-temperature steel is BaO-MgO-CaF2-Al2O3-highly basic sintered fluxes of the REO type.
The welding process of the solid welding wire for the submerged-arc transverse welding of the high-manganese austenitic low-temperature steel sequentially comprises backing welding, filling welding and cover surface welding:
the welding process of the backing weld comprises the following steps: the welding current is 310-470A, the arc voltage is 22-34V, and the welding speed is 30-55 cm/min.
The welding process of the filling welding comprises the following steps: the welding current is 320-550A, the arc voltage is 24-35V, and the welding speed is 35-65 cm/min.
The welding process of the cover surface welding comprises the following steps: the welding current is 300-550A, the arc voltage is 24-35V, and the welding speed is 35-75 cm/min.
The groove type of the steel plate of the high manganese austenite low temperature steel is an X-shaped symmetrical groove or a K-shaped symmetrical groove;
the X-shaped symmetrical groove: the upper bevel angle is 30-45 degrees, the lower bevel angle is 0-15 degrees, the truncated edge is 0-2 mm, and the gap is 2-3 mm; the assembly gap is 0-10 mm, and the misalignment amount is 0-7 mm.
The K-shaped symmetrical groove: the angle of the upper groove is 30-45 degrees, the angle of the lower groove is 0 degree, the truncated edge is 0-2 mm, and the gap is 2-3 mm; the assembly gap is 0-10 mm, and the misalignment amount is 0-7 mm.
The high manganese austenite low-temperature steel is 10-30 mm thick.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
the high manganese austenite low temperature steel submerged arc horizontal prepared by the inventionC, Mn, Ni and Cu in chemical components of the solid welding wire for welding (hereinafter referred to as the solid welding wire for submerged arc transverse welding) are all austenite stable elements, and the design that C is 0.20-0.60 wt%, Mn is 20-32 wt%, Ni is 0.1-2 wt% and Cu is 0.55-1.00 wt% is adopted, so that the formed welding metal is still in a full austenite structure at the temperature of-196 ℃, and the fault energy is 22.5-23.8 mJ/m2Twin crystals are used as a main deformation mode when external force is applied at low temperature, so that the comprehensive mechanical properties including ultra-low temperature impact toughness, strength and ductility are ensured.
Cr and Mo in chemical components of the solid-core welding wire for submerged arc transverse welding are main solid-solution strengthening elements, and the yield strength of a weld metal formed by welding the solid-core welding wire obtained by the combined action of 0.1-1.8 wt% of Cr and 1.3-3.0 wt% of Mo can reach more than 400MPa at room temperature.
W, Al, trace elements Nb + V + Ti + B + RE and the like in the chemical components of the solid-core welding wire for submerged arc transverse welding are main precipitation strengthening elements and modified inclusion elements, and the yield strength and the tensile strength of formed weld metal at room temperature are further improved by precipitation strengthening and inclusion improvement on the effect of solid solution strengthening through the design that W is 0.5-1.9 wt%, Al is 0.5-2 wt% and Nb + V + Ti + B + RE is 0-0.5 wt%, and the ductility of the formed weld metal at low temperature is not damaged.
The Si element in the chemical components of the solid welding wire for submerged arc transverse welding plays a role in solid solution strengthening on one hand and a role in adjusting the viscosity of liquid metal in a molten pool on the other hand. The Si content in the weld metal is too high, so that the strength is improved, but the ultralow-temperature toughness is reduced; the Si content in the weld metal is too low, so that the function of adjusting the viscosity of the liquid metal in a molten pool cannot be realized. Matched with high-alkaline sintered flux, and ensures that weld metal has good formability under the condition of gas-slag combined protection. Therefore, Si in the chemical components of the solid welding wire for transverse submerged arc welding is less than or equal to 0.05 wt%.
In the invention, the existence of impurity elements of sulfur and phosphorus leads weld metal to generate liquefaction cracks and reheating cracks, so the contents of the sulfur and phosphorus elements are strictly controlled: p is less than or equal to 0.002 wt% and S is less than or equal to 0.001 wt%. By purifying the molten steel, the P and S contents of the welding wire are reduced to the minimum, the hot cracking tendency caused by P, S segregation is avoided, and the good weld metal quality is ensured.
The invention adopts BaO-MgO-CaF2-Al2O3the-REO type high-alkaline sintered flux does not generate welding smoke dust in the welding process under the condition of gas-slag combined protection, plays a role in protecting the health of welders, and ensures that weld metal is well formed. A conventional submerged arc transverse welding machine is adopted, a solid welding wire is used as an electrode, the solid welding wire can be melted quickly, the welding efficiency can be improved, and full-automatic welding can be realized.
The solid welding wire for submerged-arc transverse welding prepared by the invention is used for welding high-manganese austenite low-temperature steel, and weld metal forms a full austenite structure, so that excellent ultralow-temperature toughness is ensured, and the impact energy A at-196 ℃ is highkv68-75J; sufficient strength is also ensured: the yield strength is 410-440 MPa, the tensile strength is 670-690 MPa, the elongation A is 40-43%, and the mechanical property requirement and the ultra-low temperature toughness requirement of the high manganese austenite low-temperature steel at the working temperature of-196 ℃ are met.
The invention is used for welding at the transverse welding position, and has the characteristics of full-automatic welding, high welding efficiency, no welding smoke, good weld metal forming and excellent mechanical property; the formed weld metal has excellent low-temperature toughness and strength matched with high-manganese austenitic low-temperature steel, and a welding joint has mechanical properties of high strength and excellent ultralow-temperature toughness; the invention meets the technical requirements of the strength and ultra-low temperature toughness of the LNG storage tank used at the working temperature of-196 ℃.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting its scope.
In order to avoid repetition, the related processes of this embodiment are described in a unified manner as follows, and are not described in the embodiments again:
the preparation method of the solid welding wire for the submerged arc transverse welding of the high manganese austenite low temperature steel comprises the following steps: smelting, forging, rolling, heat treating, drawing, surface treating and winding according to the chemical components of the solid welding wire for submerged arc transverse welding to prepare the solid welding wire for the submerged arc transverse welding of the high manganese austenite low-temperature steel.
The flux matched with the solid welding wire for the submerged-arc transverse welding of the high-manganese austenitic low-temperature steel is BaO-MgO-CaF2-Al2O3-highly basic sintered fluxes of the REO type.
Example 1
A solid welding wire for submerged arc horizontal welding of high manganese austenite low temperature steel and a welding process thereof.
The solid welding wire for transverse submerged arc welding in the embodiment comprises the following chemical components: c is 0.20-0.28 wt%; si is 0.02-0.03 wt%; mn is 20-24 wt%; ni accounts for 1.3-2 wt%; 1.2-1.8 wt% of Cr; cu is 0.55-0.75 wt%; w is 1.2-1.6 wt%; mo accounts for 1.3-1.9 wt%; al accounts for 1.5-2.0 wt%; nb + V + Ti + B + RE is 0.25-0.5 wt%; p is less than or equal to 0.002 wt%; s is less than or equal to 0.001 wt%; the balance being Fe and unavoidable impurities.
The diameter of the submerged-arc transverse welding wire for the high-manganese austenitic steel is 2.0 mm.
The welding process of the solid welding wire for the submerged-arc transverse welding of the high-manganese austenitic low-temperature steel sequentially comprises backing welding, filling welding and cover surface welding:
the welding process of the backing weld comprises the following steps: the welding current is 310-330A, the arc voltage is 22-24V, and the welding speed is 30-32 cm/min.
The welding process of the filling welding comprises the following steps: the welding current is 320-350A, the arc voltage is 24-26V, and the welding speed is 35-37 cm/min.
The welding process of the cover surface welding comprises the following steps: the welding current is 300-310A, the arc voltage is 24-26V, and the welding speed is 35-37 cm/min.
The thickness of the high manganese austenite low temperature steel plate is 10 mm.
The high manganese austenite low temperature steel comprises the following chemical components: 0.45 wt% of C, 0.10 wt% of Si, 28 wt% of Mn, 0.05 wt% of N, 0.004 wt% of P and 0.003 wt% of S. The mechanical properties of the 25Mn ultralow-temperature steel are as follows: the yield strength is 475MPa, the tensile strength is 810MPa, and the elongation A is 41 percent; impact energy A at-196 DEG CkvIs 75J.
The groove type adopted in this embodiment is a K-shaped symmetrical groove: the angle of the upper groove is 30-40 degrees, the angle of the lower groove is 0 degree, the truncated edge is 0mm, and the gap is 2-2.5 mm; the assembly gap is 0mm, and the misalignment amount is 0 mm.
The welded weld metal microstructure and mechanical properties of the embodiment are detected and analyzed: the weld metal is a full austenite structure, and the weld metal is well formed; the yield strength of the weld metal is 421-440 MPa, the tensile strength is 673-690 MPa, the elongation A is 40-42%, and the average value A of the impact energy at-196 ℃ iskv＝69～73J。
Example 2
A solid welding wire for submerged arc horizontal welding of high manganese austenite low temperature steel and a welding process thereof.
The solid welding wire for transverse submerged arc welding in the specific embodiment comprises the following chemical components: c is 0.41-0.60 wt%; si is 0.03-0.05 wt%; mn is 29-32 wt%; ni is 0.1-0.8 wt%; 0.1-0.7 wt% of Cr; cu is 0.75-0.80 wt%; w is 1.6-1.9 wt%; mo accounts for 1.9-2.4 wt%; al accounts for 1.0-1.5 wt%; nb + V + Ti + B + RE is less than or equal to 0.1 wt%; p is less than or equal to 0.002 wt%; s is less than or equal to 0.001 wt%; the balance being Fe and unavoidable impurities.
The diameter of the high manganese austenitic steel submerged arc transverse welding wire is 2.5 mm.
The welding process of the solid welding wire for the submerged-arc transverse welding of the high-manganese austenitic low-temperature steel sequentially comprises backing welding, filling welding and cover surface welding:
the welding process of the backing weld comprises the following steps: the welding current is 410-420A, the arc voltage is 28-29V, and the welding speed is 41-43 cm/min;
the welding process of the filling welding comprises the following steps: the welding current is 450-470A, the arc voltage is 30-32V, and the welding speed is 50-52 cm/min;
the welding process of the cover surface welding is as follows: the welding current is 440-460A, the arc voltage is 30-32V, and the welding speed is 50-52 cm/min.
The specification of the high manganese austenite low temperature steel plate is 20 mm.
The high manganese austenite low temperature steel comprises the following chemical components: c is0.45 wt%, Si 0.10 wt%, Mn 28 wt%, N0.05 wt%, P0.004 wt%, and S0.003 wt%. The mechanical properties of the 25Mn ultralow-temperature steel are as follows: the yield strength is 475MPa, the tensile strength is 810MPa, and the elongation A is 41 percent; impact energy A at-196 DEG CkvIs 75J.
The groove type adopted in this embodiment is a K-shaped symmetrical groove: the angle of the upper groove is 40-45 degrees, the angle of the lower groove is 0 degree, the truncated edge is 0.5-2 mm, and the gap is 2.5-3 mm; the assembly gap is 1-10 mm, and the misalignment amount is 1-7 mm.
The welded weld metal microstructure and mechanical properties of the embodiment are detected and analyzed: the weld metal is a full austenite structure, and the weld metal is well formed; the yield strength of the weld metal is 410-425 MPa, the tensile strength is 682-688 MPa, the elongation A is 40-41%, and the average value A of the impact energy at the temperature of-196 DEG Ckv＝69～72J。
Example 3
A solid welding wire for submerged arc horizontal welding of high manganese austenite low temperature steel and a welding process thereof.
The solid welding wire for submerged-arc transverse welding in the specific embodiment comprises the following chemical components: c is 0.20-0.60 wt%; si is less than or equal to 0.05 wt%; mn is 20-32 wt%; ni is 0.1-2 wt%; 0.1-1.8 wt% of Cr; cu is 0.55-1.00 wt%; w is 0.5-1.9 wt%; mo accounts for 1.3-3.0 wt%; 0.5-2 wt% of Al; nb + V + Ti + B + RE is less than or equal to 0.5 wt%; p is less than or equal to 0.002 wt%; s is less than or equal to 0.001 wt%; the balance being Fe and unavoidable impurities.
The diameter of the high manganese austenitic steel submerged arc transverse welding wire is 3.2 mm.
The welding process of the solid welding wire for the submerged-arc transverse welding of the high-manganese austenitic low-temperature steel sequentially comprises backing welding, filling welding and cover surface welding:
the welding process of the backing weld comprises the following steps: the welding current is 460-470A, the arc voltage is 32-34V, and the welding speed is 50-55 cm/min;
the welding process of the filling welding comprises the following steps: the welding current is 520-550A, the arc voltage is 33-35V, and the welding speed is 62-65 cm/min;
the welding process of the cover surface welding comprises the following steps: the welding current is 520-550A, the arc voltage is 34-35V, and the welding speed is 73-75 cm/min.
The thickness of the high manganese austenite low temperature steel plate is 30 mm.
The high manganese austenite low temperature steel comprises the following chemical components: 0.45 wt% of C, 0.10 wt% of Si, 28 wt% of Mn, 0.05 wt% of N, 0.004 wt% of P and 0.003 wt% of S. The mechanical properties of the 25Mn ultralow-temperature steel are as follows: the yield strength is 475MPa, the tensile strength is 810MPa, and the elongation A is 41 percent; impact energy A at-196 DEG CkvIs 75J.
The groove type adopted by the embodiment is an X-shaped symmetrical groove, the angle of the upper groove is 30-45 degrees, the angle of the lower groove is 0 or 5-15 degrees, the truncated edge is 0 or 1-2 mm, and the gap is 2-3 mm; the assembly gap is 0 or 2-10 mm, and the misalignment amount is 0 or 1-7 mm.
The welded weld metal microstructure and mechanical properties of the embodiment are detected and analyzed: the weld metal is a full austenite structure, and the weld metal is well formed; the yield strength of the weld metal is 412-420 MPa, the tensile strength is 670-685 MPa, the elongation A is 40-41%, and the average value A of the impact energy at minus 196 ℃ iskv＝70～75J。
Compared with the prior art, the specific implementation mode has the following positive effects:
the solid welding wire for the submerged-arc transverse welding of the high-manganese austenitic low-temperature steel prepared by the embodiment comprises austenite stabilizing elements such as C0.20-0.60 wt%, Mn 20-32 wt%, Ni 0.1-2 wt% and Cu 0.55-1.00 wt%, and ensures that the weld metal formed at-196 ℃ is still in a fully austenitic structure and the stacking fault energy is 22.5-23.8 mJ/m2Twin crystals are used as a main deformation mode when external force is applied at low temperature, so that the comprehensive mechanical properties including ultra-low temperature impact toughness, strength and ductility are ensured.
Cr and Mo in chemical components of the solid-core welding wire for submerged-arc transverse welding in the embodiment are main solid-solution strengthening elements, and the yield strength of weld metal formed by welding the solid-core welding wire obtained by the combined action of 0.1-1.8 wt% of Cr and 1.3-3.0 wt% of Mo can reach more than 400MPa at room temperature.
W, Al, trace elements Nb + V + Ti + B + RE and the like in the chemical components of the solid welding wire for submerged arc transverse welding are main precipitation strengthening elements and modified inclusion elements, and the yield strength and the tensile strength of the formed weld metal at room temperature are further improved by precipitation strengthening and improving the appearance of the inclusions on the basis of solid solution strengthening by adopting the design that W is 0.5-1.9 wt%, Al is 0.5-2 wt% and Nb + V + Ti + B + RE is 0-0.5 wt%, and the ductility of the formed weld metal at low temperature is not damaged.
The Si element in the chemical composition of the solid wire for submerged arc horizontal welding according to the present embodiment plays a role of solid solution strengthening on the one hand, and a role of adjusting the viscosity of the liquid metal in the molten pool on the other hand. The Si content in the weld metal is too high, so that the strength is improved, but the ultralow-temperature toughness is reduced; the Si content in the weld metal is too low, so that the function of adjusting the viscosity of the liquid metal in a molten pool cannot be realized. Matched with high-alkaline sintered flux, and ensures that weld metal has good formability under the condition of gas-slag combined protection. Therefore, the solid wire for transverse submerged arc welding of the present embodiment has a chemical composition in which Si is 0.05 wt% or less.
In the embodiment, the existence of the impurity elements of sulfur and phosphorus enables the weld metal to generate a liquefaction crack and a reheating crack, so the contents of the sulfur and phosphorus elements are strictly controlled: p is less than or equal to 0.002 wt% and S is less than or equal to 0.001 wt%. By purifying the molten steel, the P and S contents of the welding wire are reduced to the minimum, the hot cracking tendency caused by P, S segregation is avoided, and the good weld metal quality is ensured.
The specific embodiment adopts BaO-MgO-CaF2-Al2O3the-REO type high-alkaline sintered flux does not generate welding smoke dust in the welding process under the condition of gas-slag combined protection, plays a role in protecting the health of welders, and ensures that weld metal is well formed. A conventional submerged arc transverse welding machine is adopted, a solid welding wire is used as an electrode, the solid welding wire can be melted quickly, the welding efficiency can be improved, and full-automatic welding can be realized.
Submerged arc beam prepared by the present embodimentThe solid welding wire for welding is used for welding high-manganese austenite low-temperature steel, and weld metal forms a full austenite structure, so that not only is excellent ultralow-temperature toughness ensured, but also the impact energy A at-196 DEG Ckv68-75J; sufficient strength is also ensured: the yield strength is 410-440 MPa, the tensile strength is 670-690 MPa, the elongation A is 40-43%, and the mechanical property requirement and the ultra-low temperature toughness requirement of the high manganese austenite low-temperature steel at the working temperature of-196 ℃ are met.
The specific embodiment is used for welding at a transverse welding position, and has the characteristics of full-automatic welding, high welding efficiency, no welding smoke, good weld metal forming and excellent mechanical property; the formed weld metal has excellent low-temperature toughness, the strength is matched with high-manganese austenitic low-temperature steel, and a welding joint has mechanical properties of high strength and excellent ultralow-temperature toughness; the specific implementation mode meets the technical requirements of the strength and ultralow temperature toughness of the LNG storage tank used at the working temperature of-196 ℃.
Claims (4)
1. The solid welding wire for the submerged-arc transverse welding of the high-manganese austenitic low-temperature steel is characterized by comprising the following chemical components: 0.20 to 0.60 weight percent of C and less than or equal to Si
0.05 wt%, 20-32 wt% of Mn, 0.1-2 wt% of Ni, 0.1-1.8 wt% of Cr, 0.55-1.00 wt% of Cu, 0.5-1.9 wt% of W, 1.3-3.0 wt% of Mo, 0.5-2 wt% of Al, 0-0.5 wt% of Nb + V + Ti + B + RE, less than or equal to 0.002 wt% of P, less than or equal to 0.001 wt% of S, and the balance of Fe and inevitable impurities;
the preparation method of the solid welding wire for the submerged arc transverse welding of the high manganese austenite low temperature steel comprises the following steps: smelting, forging, rolling, heat treating, drawing, surface treating and winding according to chemical components of the solid welding wire for submerged arc transverse welding to prepare the solid welding wire for the submerged arc transverse welding of the high manganese austenitic low-temperature steel;
the solid welding wire for submerged arc transverse welding of the high manganese austenitic low-temperature steel has a diameter of 2.0-3.2 mm;
the flux matched with the solid welding wire for the submerged-arc transverse welding of the high-manganese austenitic low-temperature steel is BaO-MgO-CaF2-Al2O3Of the type-REOHigh alkaline sintered flux.
2. The welding process of the solid welding wire for the submerged-arc transverse welding of the high-manganese austenitic low-temperature steel is characterized by sequentially comprising the following steps of backing welding, filling welding and cover welding:
the welding process of backing welding comprises the following steps: the welding current is 310-470A, the arc voltage is 22-34V, and the welding speed is 30-55 cm/min;
the welding process of filling welding comprises the following steps: the welding current is 320-550A, the arc voltage is 24-35V, and the welding speed is 35-65 cm/min;
the welding process of the cover welding comprises the following steps: the welding current is 300-550A, the arc voltage is 24-35V, and the welding speed is 35-75 cm/min.
3. The welding process of the solid welding wire for the submerged arc horizontal arc welding of the high manganese austenitic low-temperature steel according to claim 2, characterized in that the groove pattern of the steel plate of the high manganese austenitic low-temperature steel is an X-shaped symmetrical groove or a K-shaped symmetrical groove;
the X-shaped symmetrical groove: the upper bevel angle is 30-45 degrees, the lower bevel angle is 0-15 degrees, the truncated edge is 0-2 mm, and the gap is 2-3 mm; the assembly gap is 0-10 mm, and the misalignment amount is 0-7 mm;
the K-shaped symmetrical groove: the angle of the upper groove is 30-45 degrees, the angle of the lower groove is 0 degree, the truncated edge is 0-2 mm, and the gap is 2-3 mm; the assembly gap is 0-10 mm, and the misalignment amount is 0-7 mm.
4. The welding process of the solid welding wire for the submerged arc horizontal arc welding of the high manganese austenitic low-temperature steel according to the claim 2, characterized in that the thickness of the steel plate of the high manganese austenitic low-temperature steel is 10-30 mm.
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