WO2015083878A1 - 극저온 충격 인성이 우수한 고강도 용접이음부 및 이를 위한 플럭스 코어드 아크 용접용 와이어 - Google Patents
극저온 충격 인성이 우수한 고강도 용접이음부 및 이를 위한 플럭스 코어드 아크 용접용 와이어 Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3073—Fe as the principal constituent with Mn as next major constituent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—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
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
Definitions
- the present invention relates to a high-strength welded joint having excellent cryogenic impact toughness and a flux cored arc welding wire therefor, and more particularly, to being maintained in an austenite phase having excellent toughness even in a cryogenic environment, thereby providing excellent low temperature impact toughness and room temperature yield
- a welded joint having strength and a wire for flux cored arc welding for providing the same.
- the welding material Inconel 625 material: more than 50% by weight of Ni and more than 20% by weight of Cr
- STS has a high price, low thermal strain, and cryogenic temperature
- the room temperature yield strength was 360MPa, but the current room temperature yield strength of high Mn steel is 500 ⁇ 800MPa.
- the strength of the welded joint is low, the design of the welded joint is performed, and thus, the thickness of the steel sheet also needs to be thickened.
- a welding material having a room temperature yield strength of 400 MPa or more is required.
- it is conventionally secured by using high Ni and Cr content (more than 50% by weight of Ni and more than 20% by weight of Cr), but the welding material which shows low level in alloy content and price There is a problem that the welded joint does not exist.
- one aspect of the present invention is maintained in austenite phase with excellent toughness even in cryogenic environment, and prevents high temperature cracking during welding, and has excellent low temperature impact toughness and room temperature yield strength, submerged, flux cored, gas metal arc It is an object to provide a welded joint obtainable from welding.
- one aspect of the present invention is to provide a flux cored arc welding wire for providing the welded joint.
- the welded joint is, in weight%, C: 0.1 to 0.61%, Si: 0.23 to 1.0%, Mn: 14 to 35%, Cr: 6% or less, Mo: 1.45 to 3.5%, S: 0.02% or less, P: 0.02% or less, B: 0.001% to 0.01%, Ti: 0.001% to 0.2%, N: 0.001% to 0.3%, and a high strength welded joint having excellent cryogenic toughness including residual Fe and other unavoidable impurities.
- W, Nb and V is one or more selected from the sum: It is preferably further included in the range of 5% by weight or less.
- Y and / or REM 0.1% by weight or less.
- Ni in the range of 10 weight% or less.
- the high Mn steel may be a high Mn steel based on Mn 24 C 0.4 Cr 4 Si 0.3 .
- C 0.15 to 0.8%, Si: 0.2 to 1.2%, Mn: 15 to 34%, Cr: 6% or less, Mo: 1.5 to 4%, S: 0.02% or less, P: 0.02% or less, B: 0.01% or less, Ti: 0.09% to 0.5%, N: 0.001% to 0.3%, TiO 2 : 4% to 15%, the sum of at least one selected from SiO 2 , ZrO 2, and Al 2 O 3 : 0.01% to 9%, Sum of at least one selected from K, Na and Li: 0.5-1.7%, at least one of F and Ca: 0.2-1.5%, Flux cored arc with high strength and cryogenic impact toughness, including residual Fe and other unavoidable impurities It relates to a welding wire.
- Ni further in the range of 10 weight% or less.
- the welded joint of the present invention which is formed as described above, is maintained in an austenite phase having excellent toughness even in a cryogenic environment, and prevents high temperature cracking during welding, thereby having excellent low temperature impact toughness and room temperature yield strength. It can be effectively applied to welding of the back.
- the flux cored welding wire of the present invention can be effectively obtained the welded joint having the above-described low-temperature toughness and room temperature yield strength, so that the welding having excellent impact toughness in the cryogenic region -196 °C or less It is possible to secure the structure.
- the present invention is a welded joint obtained by welding high temperature cryogenic high Mn steel, wherein the welded joint is in weight%, C: 0.1 to 0.61%, Si: 0.23 to 1.0%, Mn: 14 to 35%, Cr: 6% or less, Mo: 1.45 to 3.5%, S: 0.02% or less, P: 0.02% or less, B: 0.001 to 0.01%, Ti: 0.001 to 0.2%, N: 0.001 to 0.3%, balance Fe and others Contains inevitable impurities.
- C 0.1 to 0.61%
- Si 0.23 to 1.0%
- Mn 14 to 35%
- Cr 6% or less
- Mo 1.45 to 3.5%
- S 0.02% or less
- P 0.02% or less
- B 0.001 to 0.01%
- N 0.001 to 0.3%
- balance Fe and others Contains inevitable impurities.
- Carbon is the most powerful element existing as an austenite stabilizing element capable of securing the strength of the welded joint and securing the cryogenic impact toughness of the welded joint, and is an essential element in the present invention.
- the lower limit of the carbon content may be limited to 0.1% by weight.
- carbon dioxide gas may be generated during welding, which may cause defects in the weld joint, and carbides such as MC, M 23 C 6 may be formed by combining with alloying elements such as manganese and chromium.
- the content of carbon is preferably limited to 0.1-0.61% by weight.
- Silicon is an element added for the deoxidation effect in the weld joint and the spreadability of the weld bead. If the silicon content is insufficient (less than 0.23% by weight), the fluidity of the welded joint may be lowered. On the other hand, if the silicon content exceeds 1.0% by weight, it may cause segregation in the welded joint, resulting in low temperature impact toughness. There is a problem that decreases and adversely affects the weld cracking sensitivity. Therefore, in the present invention, it is preferable to limit the content of the silicon to 0.23 to 1.0% by weight.
- Manganese is a major element for producing austenite, which is a low temperature stable phase, and is an element that must be added in the present invention and is a very inexpensive element compared to nickel. If the content of manganese is less than 14% by weight, sufficient austenite is not produced, resulting in very low toughness at cryogenic temperatures. On the other hand, when the content of manganese exceeds 35% by weight, excessive segregation may occur, high temperature cracking may occur, and harmful fume may be generated. Therefore, the content of manganese is preferably limited to 14 to 35% by weight.
- Chromium has the advantage of lowering the content of austenite stabilizing elements through a constant amount of chromium as a ferrite stabilizing element.
- the base can be maintained as austenite, so the lower limit of the content of Cr is zero.
- the content of chromium exceeds 6% by weight, there is a problem in that chromium-based carbides are excessively generated to lower the cryogenic toughness. Therefore, the content of chromium is preferably limited to 6% by weight or less.
- Molybdenum is an element capable of improving the strength of the matrix, and when an alloy of more than 1.45% by weight is used, the tensile strength may exhibit 400 MPa or more. In addition, in the austenitic welding material, it can serve to suppress the occurrence of high temperature crack by narrowing the solid-liquid coexistence section during construction. However, when the content of molybdenum exceeds 3.5% by weight, the molybdenum carbide is excessively generated, which has the disadvantage of lowering the cryogenic toughness. Therefore, the content of molybdenum is preferably limited to 1.45 ⁇ 3.5% by weight.
- Sulfur is an element that precipitates the MnS composite precipitate, but when the content exceeds 0.02% by weight, it is not preferable because sulfur may form a low melting point compound such as FeS to cause high temperature cracking. Therefore, the content of sulfur is preferably limited to 0.02% by weight or less.
- Phosphorus (P) 0.02 wt% or less
- Phosphorus is an element that affects low-temperature toughness, so that a phosphorus compound embrittled at the grain boundary is produced. Therefore, the upper limit thereof is preferably 0.02% by weight.
- Boron exhibits segregation at grain boundaries.
- the segregated boron serves to improve the strength of the grain boundary, thereby exhibiting an effect of improving the strength. This effect is sufficiently shown even if only 0.001% by weight of boron is added. However, when more than 0.01% by weight is added, the strength improvement effect is great, but it acts as a cause to lower the low temperature toughness. Therefore, in the present invention, it is preferable to limit the content of boron to 0.001 to 0.01 wt%.
- Titanium enters the weld seam in the form of oxides or nitrides.
- these oxides or nitrides are present in the crystal grains, and act as nucleation sites upon solidification at high temperatures, thereby reducing the grains of austenite.
- Oxides and nitrides also serve to enhance strength in tissues. Even if only 0.001% of titanium is added, the strength-improving effect is exhibited.
- the lower limit of the content of titanium is 0.001% by weight. However, in the case of containing a large amount of titanium, impact toughness is lowered. If it exceeds 0.2% by weight, the strength improvement effect is great, but it may act as a cause of lowering the low temperature toughness. In consideration of this, in the present invention, it is preferable to limit the content of the titanium to 0.001 to 0.2% by weight.
- Nitrogen is an element that exhibits the same properties as carbon and is an element that forms nitride together with titanium. It is preferable that 0.001% by weight or more is included because only 0.001% by weight can improve the strength with titanium. On the other hand, when the nitrogen content exceeds 0.3% by weight, pores are easily generated in the welded joint, and the upper limit is 0.3% by weight because the cryogenic impact toughness is lowered by increasing the amount of nitride produced together with titanium. desirable.
- the above-described alloy component range is a basic component system that can be preferably applied to the welded joint of the present invention, and thus, it is possible to additionally impart better physical properties to the welded joint by the addition of alloying elements described below.
- Tungsten (W), niobium (Nb) or vanadium (V) are elements that increase room temperature strength and are components that may be optionally contained in the present invention. These elements combine with carbon in the weld seam to form carbides (or carbonitrides), and exhibit the effect of improving the tensile strength at room temperature. However, when the content exceeds 5% by weight, cracks are easily generated, and also act as a cause of lowering the cryogenic impact toughness. Therefore, in the present invention, it is more preferable to limit the sum of at least one of tungsten (W), niobium (Nb) and vanadium (V) to 5% by weight or less.
- Yttrium (Y) and / or rare earth metals (REM) are optionally contained in the present invention, which are formed as oxides at high temperatures, and act as nucleation sites upon solidification at high temperatures, thereby reducing the grain size of austenite. Will be This serves to improve the strength. However, if the content exceeds 0.1% by weight, the role of generating defects in the joint during welding should be controlled to 0.1% by weight or less. Therefore, in the present invention, it is more preferable to contain yttrium (Y) and / or rare earth metal (REM) at 0.1 wt% or less.
- Nickel is an element selectively contained in the present invention and is a component added as an austenite stabilizing element. When nickel is added, the low temperature impact toughness increases at a very high speed because it increases the stacking fault energy in the welded joint, thereby increasing the low temperature impact toughness. Nickel, on the other hand, is not only an element that lowers the strength but also an element that increases the price of the welding material, so it is more preferable to keep it at 10 wt% or less.
- the rest includes Fe and unavoidable impurities. However, this does not exclude the addition of other compositions.
- the welded joint of the present invention may be applied to various high Mn steels requiring high strength and low temperature toughness at cryogenic temperatures, and are not limited to a specific welding base material composition.
- the high Mn steel is based on Mn 24 C 0.4 Cr 4 Si 0.3 .
- the flux cored arc welding wire of the present invention is, by weight, C: 0.15 to 0.8%, Si: 0.2 to 1.2%, Mn: 15.0 to 34.0%, Cr: 6% or less, Mo: 1.5 to 4%, S: 0.02% or less, P: 0.02% or less, B: 0.01% or less, Ti: 0.09 to 0.5%, N: 0.001 to 0.3%, TiO 2 : 4 to 15%, SiO 2 , ZrO 2 and Al 2 O 3 Sum of at least one selected from: 0.01 to 9%, Sum of at least one selected from K, Na and Li: 0.5 to 1.7%, at least one of F and Ca: 0.2 to 1.5%, including residual Fe and other unavoidable impurities do.
- C 0.15 to 0.8%
- Si 0.2 to 1.2%
- Mn 15.0 to 34.0%
- Cr 6% or less
- Mo 1.5 to 4%
- S 0.02% or less
- P 0.02% or less
- B 0.01% or less
- Carbon is the most powerful element existing as an austenite stabilizing element capable of securing strength of welded joints and securing cryogenic impact toughness of welded joints, and is an essential element in the present invention. If the carbon content is low, all austenite is not stabilized, so it is necessary to maintain an appropriate amount of carbon, and the lower limit is limited to 0.15% by weight. If the carbon content exceeds 0.8% by weight, carbon dioxide gas may be generated during welding, which may cause defects in the weld joint, and carbides such as MC, M 23 C 6 , and the like may be combined with alloying elements such as manganese and chromium. There is a problem that the impact toughness is lowered at low temperatures. Therefore, in the present invention, the content of carbon is preferably limited to 0.15 to 0.8% by weight.
- the silicon content is less than 0.2% by weight, the deoxidation effect in the welded joint is insufficient and the fluidity of the welded joint can be reduced.
- the content of silicon exceeds 1.2% by weight, it causes segregation and the like in the welded joint, thereby deteriorating low-temperature impact toughness and adversely affecting weld cracking sensitivity. Therefore, in the present invention, it is preferable to limit the content of the silicon to 0.2 to 1.2% by weight.
- Manganese is a major element that increases work hardening and generates austenite, which is a low temperature stable phase, and is an essential component of the wire of the present invention. In addition, it acts as a carbide generating element together with C, and acts as an austenite stabilizing element similarly to nickel.
- the content of manganese is less than 15.0% by weight, there is a problem in low temperature impact toughness due to not enough austenite is produced, while if the content of manganese exceeds 34.0% by weight, a large amount of fume during welding It is preferable to limit the content to the range of 15.0 to 34.0% by weight.
- Chromium is a ferrite stabilizing element, by adding chromium has the advantage of lowering the content of the austenite stabilizing element. Chromium also plays a key role in the formation of carbides such as MC, M 23 C 6 . That is, when a certain amount of chromium is added, not only can a higher level of precipitation hardening be obtained, but also a lower content of the austenite stabilizing element is preferable, but a certain amount of chromium is preferably added, but an element that is not necessarily added. to be. In addition, chromium is a strong anti-oxidation element and has an advantage of increasing oxidation resistance corresponding to an external oxidation atmosphere.
- the content of chromium exceeds 6.0% by weight, the price rises and at the same time the cryogenic impact toughness is sharply dropped by the precipitated phase. Therefore, the content of chromium is preferably limited to 6.0% by weight or less.
- Molybdenum is an element that can improve the strength of the welded joint.
- the tensile strength of the welded joint is 400 MPa or more.
- the austenitic welding material it can serve to suppress the occurrence of high temperature crack by narrowing the solid-liquid coexistence section during construction.
- the content of molybdenum exceeds 4.0% by weight, molybdenum carbide is excessively generated in the welded joint, which has the disadvantage of lowering the cryogenic toughness. Therefore, the content of molybdenum is preferably limited to 1.5-4.0% by weight.
- Phosphorus (P) 0.02 wt% or less
- phosphorus is an impurity element that promotes high temperature cracks in welding, it is desirable to manage it as low as possible. Therefore, it is desirable to manage the content to 0.02% or less to prevent cracking at high temperature.
- Sulfur is desirable to be kept as low as possible because it is an impurity element that promotes high temperature cracks in welding with phosphorus. If the content exceeds 0.02% by weight, it is not preferable because a low melting point compound such as FeS may be formed to cause high temperature cracking. Therefore, in order to prevent cracking at high temperature, the sulfur content is preferably managed at 0.02% by weight or less.
- Segregated boron serves to improve the strength of the grain boundaries, thereby exhibiting an effect of improving the strength.
- the boron content is sufficient even if only 0.001% is added. However, if the content exceeds 0.01%, the strength improvement effect in the welded joint is large, but it acts as a cause to lower the low-temperature toughness, it is preferable to limit the upper limit to 0.01% by weight.
- Titanium is an element that increases the cleanliness of welded joints by acting as arc stability and oxidant during welding.
- the titanium recovered in the welded joint after the completion of welding is an element that generates oxide and nitride (or carbonitride) to improve the strength of the welded joint, it is preferable to add the content of 0.09% or more.
- the impact toughness is lowered. If the content exceeds 0.5% by weight, the strength improvement effect is great, but the lower limit is due to the low temperature toughness. Is preferably limited to 0.5% by weight.
- Nitrogen is an element that improves corrosion resistance and stabilizes austenite at the same time, and has properties similar to those of carbon. Therefore, the nitrogen component can replace the carbon component as it is, it can be seen that the effect appears even when a small amount is added.
- the content exceeds 0.3, the impact toughness is greatly reduced, and in the present invention, the content is preferably limited to the range of 0.001 to 0.3% by weight.
- TiO 2 titanium dioxide: 4-15% by weight
- TiO 2 serves as a slag forming agent to solidify before the liquid weld joint is solidified to enable electron fine welding, thereby preventing the liquid weld joint from flowing down.
- the content of TiO 2 it is preferable to limit the content of TiO 2 to 4 to 15% by weight.
- the total of at least one of SiO 2 , ZrO 2 and Al 2 O 3 is less than 0.01% by weight, slag coating and peeling properties and arc stability are poor, resulting in poor workability and weld bead formation.
- the content exceeds 9.0% by weight, the amount of molten slag is rapidly increased and the viscosity of the slag is also increased, resulting in poor electric field weldability and bead shape.
- the transition of silicon, aluminum, and the like to the weld metal increases, and the impact toughness is lowered.
- the content of at least one sum of SiO 2 , ZrO 2 and Al 2 O 3 it is preferable to limit the content of at least one sum of SiO 2 , ZrO 2 and Al 2 O 3 to 0.01 to 9.0% by weight.
- the alkali metal lowers the ionization potential of the arc during welding, thereby facilitating generation of the arc, and can maintain a stable arc during welding.
- the alkali metal should be added at least 0.5% by weight may have a noticeable effect. However, if the content exceeds 1.7% by weight, excessive welding fume may occur due to the high vapor pressure.
- the alkali metal may include one or two or more of potassium (K), sodium (Na), and lithium (Li) -based alkali metals. In the present invention, the addition effect of the alkali metal is independent of each content ratio. Do.
- the welding wire of the present invention may further improve the effects of the present invention when fluorine (F) and / or potassium (Ca) are additionally added in the alkali metal and alkaline metal fluorine compounds. Since the fluorine compound is added 0.2% by weight or more into the welding wire to generate fluorine in the arc in the high temperature arc to react with the hydrogen during welding to cause a dehydrogenation reaction to effectively reduce the diffusive hydrogen, but exceeds 1.5% by weight When the welding fume is excessively generated due to the high vapor pressure, the slag viscosity of the molten pool is excessively reduced in the rutile system in which TiO 2 is the main slag component, thereby forming unstable beads. Therefore, it is preferable to limit the content to 0.2 to 1.5% by weight.
- the above-described alloy component range is a basic component system that can be preferably applied to the welding wire of the present invention, and thus, by adding the alloying elements described below, it is possible to additionally impart better physical properties to the welding material.
- Tungsten (W), niobium (Nb), and vanadium (V) are elements that increase room temperature strength. These elements combine with carbon in the weld seam to form carbides (or carbonitrides), and exhibit the effect of improving the tensile strength at room temperature. However, when the sum exceeds 5%, cracks are easily generated, and at the same time, it acts as a cause of lowering the cryogenic impact toughness. Therefore, in the present invention, it is more preferable to limit their addition amount to 5% or less.
- Yttrium (Y) and rare earth metals (REM) act as strong oxidants during welding and at the same time improve the arc stability.
- Y Yttrium
- REM rare earth metals
- it is formed as an oxide in the weld seam, thereby acting as a nucleation site upon solidification at a high temperature, thereby reducing the grain size of the austenite. This serves to improve the strength.
- the content exceeds 1% by weight, so that the role of generating defects in the joint during welding, the content should be controlled to 1% by weight or less. Therefore, in the present invention, it is more preferable to limit the yttrium (Y) and / or the rare earth metal (REM) to the range of 1% or less.
- Nickel is an element added as an austenite stabilizing element. Nickel is added and the low temperature impact toughness of the welded joint increases at a very high speed because it serves to increase the stacking fault energy in the welded joint. However, on the contrary, it is an element that lowers the strength, and on the other hand, it is more preferable to keep the content at 10% by weight or less because it is an element that increases the price of the welding material.
- the rest includes Fe and unavoidable impurities. However, this does not exclude the addition of other compositions.
- Wires for flux cored arc welding with a diameter of 1.2 mm were prepared.
- the flux composition of the flux cord arc welding used was in weight%, C: 0.15 to 0.8%, Si: 0.2 to 1.2%, Mn: 15 to 34%, Cr: 6% or less, Mo: 1.5 to 4%, S: 0.02% or less, P: 0.02% or less, B: 0.01% or less, Ti: 0.09 to 0.5%, N: 0.001 to 0.3%, TiO 2 : 4 to 15%, SiO 2 , ZrO 2 and Al 2 O 3
- at least one of W, Nb, and V: 5% or less, Y and / or REM was 1% or less, and Ni was 10% or less.
- the welding wires were welded using a cryogenic high Mn steel having Mn 24 C 0.4 Cr 4 Si 0.3 as a basic composition as a welding base material. At this time, welding was performed under 100% CO 2 protection gas, about 290 A in DC, about 30 V in about 31 CPM, and heat input was about 1.7 kJ / mm. In addition, interlayer temperature was less than 150 degreeC, and preheating was about 100 degreeC on condition that only moisture is blown.
- the alloy composition of the welded joint obtained by welding as described above is shown in Table 1 below.
- the low temperature toughness and tensile strength of the welded joint according to the welded joint composition are also shown in Table 1 below.
- Charpy impact test (-196 ° C.) was carried out, and the results (J) are shown in Table 1 below, and the tensile strength (MPa) of the weld joint was also measured. It is shown in Table 1 below.
- Comparative Example 1 in which the Cr content was excessive, the tensile strength was high, but the low-temperature toughness was not good as 14J.
- Comparative Example 2 with excessive Si content, cracks were generated in the weld joint obtained after welding.
- Comparative Example 3 with N content, pores were formed in the weld joint.
- Comparative Example 4 containing a large amount of rare earth elements also forms pores inside the welded joint.
- Solid wires for submerged arc welding with a diameter of 4.0 mm were prepared.
- the solder wire composition for submerged arc welding used at this time is weight%, C: 0.15-0.8%, Si: 0.5-1.5%, Mn: 15-32%, Cr: 5.5% or less, Mo: 1.5- 3%, S: 0.025% or less, P: 0.025% or less, B: 0.01% or less, Ti: 0.05 to 1.2%, N: 0.005 to 0.5%, balance Fe and other unavoidable impurities, and W according to other needs At least one sum of Nb and V: 6 wt% or less, Y and / or REM: 1 wt% or less, and Ni: 10 wt% or less were added.
- the welding wires were welded using a cryogenic high Mn steel having a base composition of Mn 24 C 0.4 Cr 4 Si 0.3 as a welding base material, and an alumina basic flux was used for welding.
- the welding was performed at about 600A in DC, at about 32V in 29CPM, and at about 4.0 kJ / mm in heat input.
- interlayer temperature was less than 150 degreeC, and preheating was about 100 degreeC on condition that only moisture is blown.
- the alloy composition of the welded joint obtained by welding as described above is shown in Table 2 below.
- the low temperature toughness and tensile strength of the welded joint according to the welded joint composition is also shown in Table 2 below.
- Charpy impact test (-196 ° C.) was carried out, and the results (J) are shown in Table 2 below, and the tensile strength (MPa) of the welded joint was also measured. It is shown in Table 2 below.
- Comparative Example 1-2 having high Cr content or B content had high tensile strength but poor low temperature toughness of 25J or less.
- Comparative Example 3 in which the content of Mo is too low is good at low temperature toughness, but the tensile strength is not good as 400MPa or less.
- Comparative Example 4 in which the contents of C, P, and S were excessive cracks occurred in the weld joint
- Comparative Example 5 in which the C and Si contents were excessive cracks occurred in the weld joint.
- Gas metal arc welding wires having a diameter of 1.2 mm were prepared.
- the gas metal arc welding wire composition used at this time is the same as the solder wire for submerged arc welding in Example 2.
- the welding wires were welded using a cryogenic high Mn steel having Mn 24 C 0.4 Cr 4 Si 0.3 as a basic composition as a welding base material.
- the welding was performed at about 200A, at about 30V, at about 40CPM, and at about 0.9 kJ / mm in heat input.
- interlayer temperature was less than 150 degreeC, and preheating was about 100 degreeC on condition that only moisture is blown.
- the alloy composition of the welded joint obtained by the welding as described above is shown in Table 3 below.
- the low temperature toughness and tensile strength of the welded joint according to the welded joint composition are also shown in Table 3 below.
- Charpy impact test (-196 ° C.) was carried out, and the results (J) are shown in Table 3 below, and the tensile strength (MPa) of the weld joint was also measured. It is shown in Table 3 below.
- Comparative Example 1 in which the B content was excessive, had good tensile strength but low temperature toughness of 24J, and Comparative Example 2 having too low Mo content had good low temperature toughness but poor tensile strength of 392.1 MPa.
- the wires for flux cored arc welding having a diameter of 1.2 mm as shown in Table 4 were prepared.
- the welding wires were welded using a cryogenic high Mn steel having Mn 24 C 0.4 Cr 4 Si 0.3 as a basic composition as a welding base material.
- welding was performed under 100% CO 2 protection gas, about 290 A in DC, about 30 V in about 31 CPM, and heat input was about 1.7 kJ / mm.
- interlayer temperature was less than 150 degreeC, and preheating was about 100 degreeC on condition that only moisture is blown.
- A1 is V + Nb + W
- A2 is Y + REM
- A3 is TiO 2
- A4 is SiO 2 + ZrO 2 + Al 2 O 3
- A5 is K + Na + Li
- A6 is F + The sum of Ca is shown, respectively.
- the Charpy impact test (-196 ° C.) was carried out to evaluate the mechanical properties of the welded joints welded as described above, and the results (J) are shown in Table 4 above. In addition, it is shown in Table 4 by measuring the tensile strength (MPa) of the welded joint. On the other hand, the physical property measurement criteria were in accordance with the KS test standard, and weldability was visually evaluated.
- Comparative Example 1 in which Cr was excessively added, the low-temperature impact toughness was bad as 14 J, and Comparative Example 2 in which the B and Ti contents were outside the scope of the present invention was also poor in low temperature impact toughness. And Comparative Example 3, the content of Mo out of the range of the present invention is excellent in low temperature toughness but the tensile strength is not good as 396.08MPa.
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Abstract
Description
용접이음부 조성성분(중량%) | 충격특성(J) | 상온인장강도 | |||||||||||||
C | Mn | Si | Cr | P | S | N | Mo | B | Ti | Ni | V+Nb+W | Y+REM | |||
발며예1 | 0.12 | 28.2 | 0.65 | 1.95 | 0.011 | 0.007 | 0.1 | 1.67 | 0.002 | 0.05 | 4.7 | 4.32 | - | 28 | 513.4 |
발명예2 | 0.58 | 18.1 | 0.52 | 1.87 | 0.013 | 0.008 | 0.001 | 1.52 | 0.001 | 0.04 | - | 2.34 | - | 29 | 480.9 |
발명예3 | 0.33 | 20.1 | 0.23 | 0.01 | 0.012 | 0.008 | 0.001 | 1.52 | 0.004 | 0.11 | 5.3 | 1.23 | - | 32 | 448.6 |
비교예1 | 0.32 | 18.7 | 0.52 | 6.52 | 0.014 | 0.01 | 0.04 | 2.03 | 0.002 | 0.03 | 5.1 | - | - | 14 | 567.7 |
비교예2 | 0.75 | 15.2 | 0.52 | 0.02 | 0.021 | 0.023 | 0.001 | 1.75 | 0.001 | 0.01 | - | - | - | 크렉형성 | |
비교예3 | 0.58 | 16.2 | 1.23 | 0.03 | 0.014 | 0.005 | 0.001 | 1.72 | 0.001 | 0.03 | - | - | - | 크렉형성 | |
비교예4 | 0.58 | 18.4 | 0.42 | 1.78 | 0.012 | 0.006 | 0.002 | 1.65 | 0.001 | 0.04 | - | - | void형성 |
용접이음부 조성성분(중량%) | 충격특성(J) | 상온인장강도 | |||||||||||||
C | Mn | Si | Cr | P | S | N | Mo | B | Ti | Ni | V+Nb+W | Y+REM | |||
발명예1 | 0.1 | 34.2 | 0.95 | 3.23 | 0.006 | 0.005 | 0.26 | 3.25 | 0.01 | 0.2 | 9.1 | - | - | 54 | 477.6 |
발명예2 | 0.31 | 25.1 | 0.65 | 5.12 | 0.017 | 0.009 | 0.11 | 2.12 | 0.006 | 0.092 | 4.3 | - | - | 32 | 524.9 |
발명예3 | 0.59 | 15.2 | 0.28 | 0.03 | 0.012 | 0.017 | 0.004 | 1.54 | 0.001 | 0.04 | - | - | - | 31 | 427.5 |
발명예4 | 0.1 | 28.7 | 0.62 | 2.1 | 0.012 | 0.008 | 0.09 | 1.87 | 0.003 | 0.07 | 5.1 | 4.12 | - | 27 | 522.5 |
발명예5 | 0.52 | 20.8 | 0.58 | 1.73 | 0.015 | 0.01 | 0.004 | 1.54 | 0.001 | 0.002 | - | 2.12 | - | 29 | 474.7 |
발명예6 | 0.35 | 20.8 | 0.24 | 0.05 | 0.013 | 0.007 | 0.005 | 1.75 | 0.005 | 0.01 | 5.2 | 1.1 | - | 34 | 437.5 |
발명예7 | 0.31 | 19.5 | 0.48 | 1.11 | 0.014 | 0.008 | 0.13 | 2.05 | 0.002 | 0.14 | 5.3 | - | 0.005 | 41 | 452.9 |
비교예1 | 0.34 | 18.9 | 0.54 | 6.73 | 0.014 | 0.008 | 0.013 | 1.95 | 0.003 | 0.001 | 5.3 | - | - | 16 | 567.5 |
비교예2 | 0.58 | 19.4 | 0.54 | 1.93 | 0.011 | 0.007 | 0.091 | 1.78 | 0.02 | 0.27 | - | - | - | 25 | 478.2 |
비교예3 | 0.18 | 31.2 | 0.46 | 0.03 | 0.014 | 0.007 | 0.004 | 1.38 | 0.002 | 0.04 | 9.1 | - | - | 39 | 396.1 |
비교예4 | 0.74 | 16.9 | 0.62 | 0.03 | 0.025 | 0.024 | 0.005 | 1.67 | 0.002 | 0.05 | - | - | - | 크렉형성 | |
비교예5 | 0.62 | 15.9 | 1.52 | 0.01 | 0.015 | 0.006 | 0.003 | 1.78 | 0.001 | 0.04 | - | - | - | 크렉형성 | |
비교예6 | 0.56 | 15.5 | 0.66 | 0.01 | 0.013 | 0.008 | 0.36 | 1.52 | 0.002 | 0.04 | - | - | - | void형성 | |
비교예7 | 0.62 | 18.9 | 0.49 | 1.92 | 0.014 | 0.008 | 0.004 | 1.56 | 0.001 | 0.002 | - | - | 0.17 | void형성 |
용접이음부 조성성분(중량%) | 충격특성(J) | 상온인장강도 | |||||||||||||
C | Mn | Si | Cr | P | S | N | Mo | B | Ti | Ni | V+Nb+W | Y+REM | |||
발명예1 | 0.11 | 32.3 | 0.89 | 3.25 | 0.005 | 0.002 | 0.23 | 2.54 | 0.009 | 0.19 | 8.2 | - | - | 53 | 476.9 |
발명예2 | 0.32 | 29.8 | 0.62 | 5.52 | 0.018 | 0.01 | 0.12 | 2.23 | 0.005 | 0.12 | 4.5 | - | - | 35 | 518.4 |
발명예3 | 0.61 | 14.2 | 0.23 | 0.02 | 0.013 | 0.015 | 0.002 | 1.55 | 0.002 | 0.002 | - | - | - | 31 | 424.0 |
발명예4 | 0.29 | 19.3 | 0.45 | 1.23 | 0.012 | 0.009 | 0.12 | 2.19 | 0.001 | 0.13 | 5.1 | - | 0.06 | 36 | 463.7 |
비교예1 | 0.57 | 18.2 | 0.52 | 1.87 | 0.01 | 0.007 | 0.082 | 1.75 | 0.019 | 0.25 | - | - | - | 24 | 480.8 |
비교예2 | 0.19 | 32.5 | 0.47 | 0.03 | 0.012 | 0.007 | 0.002 | 1.4 | 0.001 | 0.002 | 8.2 | - | - | 42 | 392.1 |
비교예3 | 0.57 | 17.2 | 0.57 | 0.02 | 0.013 | 0.006 | 0.35 | 1.54 | 0.002 | 0.002 | - | - | - | void형성 |
와이어 조성성분(중량%) | 용접성 | 충격특성(J) | 인장강도 | |||||||||||||||||
C | Mn | Si | Cr | P | S | N | Mo | B | Ti | Ni | A1 | A2 | A3 | A4 | A5 | A6 | ||||
발명예1 | 0.1 | 34 | 1.2 | 3.5 | 0.01 | 0.005 | 0.26 | 3.5 | 0.01 | 0.5 | 9.5 | - | - | 13 | 0.01 | 1.7 | 1.5 | 양호 | 54 | 477.6 |
발명예2 | 0.3 | 30 | 0.7 | 5.5 | 0.02 | 0.01 | 0.12 | 2.5 | 0.005 | 0.3 | 4.5 | - | - | 9 | 1 | 1 | 1 | 양호 | 35 | 518.4 |
발명예3 | 0.6 | 15 | 0.4 | 0.02 | 0.01 | 0.02 | 0.004 | 1.5 | 0.001 | 0.1 | - | - | - | 4 | 3 | 0.5 | 0.5 | 양호 | 31 | 427.48 |
발명예4 | 0.1 | 30 | 0.7 | 2 | 0.01 | 0.01 | 0.09 | 2 | 0.005 | 0.1 | 5 | 4.5 | - | 15 | 3 | 1 | 0.6 | 양호 | 27 | 522.5 |
발명예5 | 0.6 | 19 | 0.6 | 2 | 0.02 | 0.01 | 0.001 | 1.5 | 0.001 | 0.09 | - | 2.5 | - | 6 | 6 | 1 | 0.2 | 양호 | 29 | 480.92 |
발명예6 | 0.3 | 20 | 0.2 | 0.02 | 0.015 | 0.01 | 0.001 | 1.5 | 0.005 | 0.25 | 5.5 | 1.5 | - | 6 | 3 | 0.5 | 0.5 | 양호 | 32 | 448.62 |
발명예7 | 0.3 | 20 | 0.6 | 1.2 | 0.015 | 0.01 | 0.13 | 2.5 | 0.005 | 0.25 | 5.5 | - | 0.25 | 7 | 9 | 0.5 | 0.5 | 양호 | 41 | 452.9 |
비교예1 | 0.3 | 20 | 0.6 | 6.5 | 0.015 | 0.01 | 0.04 | 2.5 | 0.005 | 0.1 | 5.5 | - | - | 7 | 5 | 0.5 | 0.5 | 양호 | 14 | 567.7 |
비교예2 | 0.6 | 20 | 0.6 | 1.9 | 0.01 | 0.01 | 0.082 | 2 | 0.02 | 0.6 | - | - | - | 8 | 5 | 0.5 | 0.5 | 양호 | 24 | 480.84 |
비교예3 | 0.2 | 31 | 0.6 | 0.05 | 0.015 | 0.01 | 0.004 | 1.4 | 0.005 | 0.1 | 9 | - | - | 7 | 5 | 0.5 | 0.5 | 양호 | 39 | 396.08 |
비교예4 | 0.75 | 15 | 0.6 | 0.02 | 0.025 | 0.25 | 0.001 | 2 | 0.001 | 0.01 | - | - | - | 6 | 1 | 0.5 | 0.2 | 불량(크렉형성) | ||
비교예5 | 0.6 | 16 | 1.3 | 0.02 | 0.015 | 0.005 | 0.001 | 2 | 0.001 | 0.03 | - | - | - | 7 | 2 | 1.7 | 0.2 | 불량(크렉형성) | ||
비교예6 | 0.6 | 16 | 0.7 | 0.01 | 0.015 | 0.01 | 0.36 | 1.5 | 0.001 | 0.04 | - | - | - | 8 | 4 | 0.5 | 0.4 | 불량(기공형성) | ||
비교예7 | 0.6 | 19 | 0.5 | 1.78 | 0.015 | 0.01 | 0.002 | 2 | 0.001 | 0.04 | - | - | 1.25 | 7 | 2 | 0.5 | 0.2 | 불량(기공형성) | ||
비교예8 | 0.6 | 15 | 0.4 | 0.02 | 0.015 | 0.01 | 0.004 | 1.5 | 0.001 | 0.1 | - | - | - | 17 | 3 | 0.01 | 0.5 | 불가 | ||
비교예9 | 0.6 | 15 | 0.7 | 5.5 | 0.01 | 0.02 | 0.001 | 1.5 | 0.001 | 0.1 | - | - | - | 6 | 10 | 0.01 | 0.5 | 불가 | ||
비교예10 | 0.3 | 30 | 0.4 | 0.02 | 0.015 | 0.01 | 0.12 | 2.5 | 0.005 | 0.3 | 4.5 | - | - | 5 | 6 | 0.5 | 2 | 불가 |
Claims (9)
- 극저온용 고강도 고Mn강을 용접하여 얻어지는 용접이음부에 있어서,상기 용접이음부는, 중량%로, C:0.1~0.61%, Si:0.23~1.0%, Mn:14~35%, Cr: 6%이하, Mo:1.45~3.5%, S:0.02%이하, P:0.02%이하, B:0.001~0.01%, Ti:0.001~0.2%, N: 0.001~0.3%, 잔부 Fe 및 기타 불가피한 불순물을 포함하는 극저온 인성이 우수한 고강도 용접이음부.
- 제 1항에 있어서, W, Nb 및 V 중 선택된 1종 이상 합: 5중량%이하를 추가로 포함함을 특징으로 하는 극저온 인성이 우수한 고강도 용접이음부.
- 제 1항에 있어서, Y 및/또는 REM:0.1중량% 이하의 범위로 추가로 포함함을 특징으로 하는 극저온 인성이 우수한 고강도 용접이음부.
- 제 1항에 있어서, Ni을 10중량% 이하의 범위로 추가로 포함함을 특징으로 하는 극저온 인성이 우수한 고강도 용접이음부.
- 제 1항에 있어서, 상기 고 Mn강은 Mn24C0.4Cr4Si0.3을 기본조성으로 함을 특징으로 하는 극저온 인성이 우수한 고강도 용접이음부.
- 중량%로, C:0.15~0.8%, Si:0.2~1.2%, Mn:15~34%, Cr:6% 이하, Mo:1.5 ~ 4%, S:0.02% 이하, P:0.02% 이하, B:0.01% 이하, Ti:0.09~0.5%, N:0.001~0.3%, TiO2:4~15%, SiO2, ZrO2 및 Al2O3중 선택된 1종 이상의 합:0.01~9%, K, Na 및 Li 중 선택된 1종 이상의 합:0.5~1.7%, F와 Ca중 1종 이상:0.2~1.5%, 잔부 Fe 및 기타 불가피한 불순물을 포함하는 고강도와 극저온 충격 인성이 우수한 플럭스 코어드 아크 용접용 와이어.
- 제 6항에 있어서, W, Nb 및 V 중 1종 이상의 합: 5중량% 이하의 범위로 추가로 포함함을 특징으로 하는 고강도와 극저온 충격 인성이 우수한 플럭스 코어드 아크 용접용 와이어.
- 제 6항에 있어서, Y 및/또는 REM: 1중량% 이하의 범위로 추가로 포함함을 특징으로 하는 고강도와 극저온 충격 인성이 우수한 플럭스 코어드 아크 용접용 와이어.
- 제 6항에 있어서, Ni을 10중량% 이하의 범위로 추가로 포함함을 특징으로 하는 고강도와 극저온 충격 인성이 우수한 플럭스 코어드 아크 용접용 와이어.
Priority Applications (7)
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EP13898649.2A EP3078447B1 (en) | 2013-12-06 | 2013-12-24 | High strength welding joint having excellent impact toughness at very low temperature, and flux-cored arc welding wire therefor |
JP2016536771A JP6240778B2 (ja) | 2013-12-06 | 2013-12-24 | 極低温衝撃靭性に優れた高強度溶接継手部及びこのためのフラックスコアードアーク溶接用ワイヤ |
ES13898649T ES2753266T3 (es) | 2013-12-06 | 2013-12-24 | Junta de soldadura de alta resistencia que tiene excelente dureza al impacto a temperatura muy baja, y un alambre de soldadura de arco con núcleo de fundente correspondiente |
US15/032,455 US20160271739A1 (en) | 2013-12-06 | 2013-12-24 | High strength welding joint having excellent impact toughness at very low temperature, and flux-cored arc welding wire therefor |
PL13898649T PL3078447T3 (pl) | 2013-12-06 | 2013-12-24 | Wysokowytrzymałe złącze spawalnicze o wysokim stopniu udarności kriogenicznej i drut spawalniczy z rdzeniem do jego tworzenia |
CN201380081451.6A CN105813799B (zh) | 2013-12-06 | 2013-12-24 | 极低温冲击韧性优异的高强度焊接接头及用于其的电弧焊接用药芯焊丝 |
US16/189,232 US10864605B2 (en) | 2013-12-06 | 2018-11-13 | High strength welding joint having excellent impact toughness at very low temperature, and flux-cored arc welding wire therefor |
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KR10-2013-0151443 | 2013-12-06 | ||
KR1020130151443A KR101560897B1 (ko) | 2013-12-06 | 2013-12-06 | 극저온 충격 인성이 우수한 고강도 용접이음부 |
KR1020130151444A KR101560898B1 (ko) | 2013-12-06 | 2013-12-06 | 고강도와 극저온 충격 인성이 우수한 플럭스 코어드 아크 용접용 와이어 |
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US16/189,232 Division US10864605B2 (en) | 2013-12-06 | 2018-11-13 | High strength welding joint having excellent impact toughness at very low temperature, and flux-cored arc welding wire therefor |
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WO2015083878A1 true WO2015083878A1 (ko) | 2015-06-11 |
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US (2) | US20160271739A1 (ko) |
EP (1) | EP3078447B1 (ko) |
JP (1) | JP6240778B2 (ko) |
CN (1) | CN105813799B (ko) |
ES (1) | ES2753266T3 (ko) |
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US11883906B2 (en) | 2016-05-02 | 2024-01-30 | Exxonmobil Research And Engineering Company | High manganese steel pipe with step-out weld zone erosion-corrosion resistance and method of making the same |
WO2017192621A1 (en) | 2016-05-02 | 2017-11-09 | Exxonmobil Research And Engineering Company | Field dissimilar metal welding technology for enhanced wear resistant high manganese steel |
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JP7220359B2 (ja) | 2016-05-02 | 2023-02-10 | エクソンモービル・テクノロジー・アンド・エンジニアリング・カンパニー | 継ぎ目溶接部の侵食-腐食耐性を有する高マンガン鋼パイプおよびその製造方法 |
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CN114769938A (zh) * | 2022-04-24 | 2022-07-22 | 燕山大学 | 一种金属药芯焊丝及其制备方法和应用 |
CN114769938B (zh) * | 2022-04-24 | 2023-07-04 | 燕山大学 | 一种金属药芯焊丝及其制备方法和应用 |
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CN105813799B (zh) | 2019-06-07 |
ES2753266T3 (es) | 2020-04-07 |
EP3078447A1 (en) | 2016-10-12 |
JP6240778B2 (ja) | 2017-11-29 |
US20160271739A1 (en) | 2016-09-22 |
CN105813799A (zh) | 2016-07-27 |
EP3078447A4 (en) | 2016-11-30 |
EP3078447B1 (en) | 2019-08-07 |
US20190084096A1 (en) | 2019-03-21 |
WO2015083878A8 (ko) | 2015-08-06 |
US10864605B2 (en) | 2020-12-15 |
JP2017502842A (ja) | 2017-01-26 |
PL3078447T3 (pl) | 2020-03-31 |
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