WO2016195028A1 - Métal soudé et structure soudée - Google Patents

Métal soudé et structure soudée Download PDF

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Publication number
WO2016195028A1
WO2016195028A1 PCT/JP2016/066442 JP2016066442W WO2016195028A1 WO 2016195028 A1 WO2016195028 A1 WO 2016195028A1 JP 2016066442 W JP2016066442 W JP 2016066442W WO 2016195028 A1 WO2016195028 A1 WO 2016195028A1
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Prior art keywords
mass
weld metal
toughness
less
content
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PCT/JP2016/066442
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English (en)
Japanese (ja)
Inventor
喜臣 岡崎
浩之 川崎
鵬 韓
秀司 笹倉
良彦 北川
真名 高和
Original Assignee
株式会社神戸製鋼所
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Priority claimed from JP2016023186A external-priority patent/JP2017001094A/ja
Application filed by 株式会社神戸製鋼所 filed Critical 株式会社神戸製鋼所
Priority to CN201680032091.4A priority Critical patent/CN107614189A/zh
Priority to EP16803462.7A priority patent/EP3305463A4/fr
Priority to US15/579,483 priority patent/US20180147674A1/en
Priority to KR1020177034938A priority patent/KR20180002791A/ko
Publication of WO2016195028A1 publication Critical patent/WO2016195028A1/fr

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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
    • 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
    • B23K35/368—Selection of non-metallic compositions of core materials either alone or conjoint with selection of soldering or welding materials

Definitions

  • the present invention relates to a weld metal and a welded structure.
  • the equivalent circle diameter By defining the equivalent circle diameter, a weld metal that exhibits high strength and excellent low-temperature toughness after SR annealing can be realized.
  • the toughness evaluation temperature of this weld metal is ⁇ 40 ° C., and it cannot be said that the toughness at ⁇ 60 ° C., which is a lower temperature, is guaranteed.
  • Japanese Unexamined Patent Publication No. 2006-239733 Japanese Unexamined Patent Publication No. 9-253886 Japanese Unexamined Patent Publication No. 2014-195832
  • the present invention has been made based on the above situation, and in a gas shielded arc welding using a flux cored wire, a weld metal capable of obtaining high strength and high toughness at ⁇ 60 ° C. or less after SR annealing, and The purpose is to provide a welded structure.
  • the present inventors have found that the toughness at low temperatures becomes unstable when fine carbides produced during welding are present in the grains of the weld metal. From this, the present inventors controlled the chemical composition of the weld metal and controlled the size of the carbide generated in the weld metal during welding, thereby providing high strength and excellent low temperature toughness after SR annealing. It was found that a weld metal exhibiting Specifically, it has been found that Mo having an action of suppressing coarsening and annealing softening of grain boundary carbides may be added to the weld metal to control the chemical component composition.
  • the weld metal has a structure in which many regions called “crystal grains” having different orientations are gathered.
  • “Grain boundary” means the boundary between these crystal grains, and the ferrite grain boundary is Of course, it means a large-angle grain boundary including a prior austenite grain boundary, a block boundary, a packet boundary, and the like. Further, “inside the grain” means the entire region including the grain boundary of the crystal grain.
  • C carbon: 0.02 mass% to 0.08 mass%
  • Si silicon: 0.10 mass% to 0.30 mass%
  • Mn manganese
  • Ni nickel
  • Cr chromium
  • Mo mobdenum
  • Ti titanium
  • Ti titanium
  • B boron
  • O oxygen
  • nitrogen 0.030% by mass or more and 0.100% by mass or less
  • N nitrogen: more than 0% by mass and 0.015% by mass or less
  • Nb (niobium) + V vanadium: 0 .008 mass% or more and 0.05 mass% or less
  • the remaining Fe (iron)
  • the weld metal can obtain high strength and toughness by setting the content of each composition within the above range. That is, high intensity
  • the weld metal has an average equivalent circle diameter of 0.10 ⁇ m or more for carbides having an equivalent circle diameter of less than 0.40 ⁇ m in the grains, the toughness at low temperature is stable and high toughness at ⁇ 60 ° C. or less is obtained.
  • the “circle equivalent diameter” means a diameter of a perfect circle having the same area as the area of carbide particles observed on an observation surface such as a transmission electron microscope (TEM: Transmission Electron Microscope).
  • composition may further comprise at least one composition.
  • strength and low-temperature toughness can be accelerated
  • a welded structure having the above-mentioned weld metal.
  • the welded structure has the weld metal, high strength and high toughness at ⁇ 60 ° C. or lower can be obtained.
  • the weld metal and welded structure of the present invention can provide high strength and high toughness at ⁇ 60 ° C. or less after SR annealing in gas shielded arc welding using a flux cored wire.
  • the weld metal has an average equivalent circle diameter of a carbide having an equivalent circle diameter of less than 0.40 ⁇ m of 0.10 ⁇ m or more.
  • the lower limit of the average equivalent circle diameter of the carbide having an equivalent circle diameter of less than 0.40 ⁇ m is 0.10 ⁇ m as described above, preferably 0.15 ⁇ m, 20 ⁇ m is more preferable.
  • the carbide size is remarkably refined, and the average equivalent circle diameter of the carbide may not be evaluated even by the measurement method of the average equivalent circle diameter of the carbide, which will be described later.
  • the average equivalent circle diameter is less than 0.10 ⁇ m ”.
  • the weld metal is present at the grain boundary, and the average equivalent circle diameter of carbide having an equivalent circle diameter of 0.40 ⁇ m or more is 0.75 ⁇ m or less.
  • the grain boundary carbide produced at the grain boundary tends to be coarser than the carbide in the grain.
  • the prior austenite grain boundaries become brittle by annealing, cracks tend to preferentially propagate from the prior austenite grain boundaries. Therefore, if coarse carbides are present in the prior austenite grain boundaries, cracks are likely to occur starting from them, and the toughness is significantly reduced during SR annealing in combination with the embrittlement phenomenon due to annealing.
  • the grain boundary carbide is kept fine as described above, the weld metal has excellent low temperature toughness after SR annealing.
  • the upper limit of the average equivalent circle diameter of carbides having an equivalent circle diameter of 0.40 ⁇ m or more is 0.75 ⁇ m as described above, preferably 0.70 ⁇ m, .65 ⁇ m is more preferable.
  • the grain boundary carbide size is remarkably refined, and the average equivalent circle diameter of the grain boundary carbide may not be evaluated even by the measurement method of the average equivalent circle diameter of the grain boundary carbide described later.
  • the average equivalent circle diameter of the grain boundary carbides of 0.40 ⁇ m or more is 0.75 ⁇ m or less ”.
  • the weld metal is C (carbon): 0.02 mass% or more and 0.08 mass% or less, Si (silicon): 0.10 mass% or more and 0.30 mass% or less, Mn (manganese): 1.20 mass % To 2.0% by mass, Ni (nickel): 0.50% to 3.00% by mass, Cr (chromium): 0% to 0.70% by mass, Mo (molybdenum): 0.
  • [C (carbon)] C is an element that ensures the strength of the weld metal after SR annealing.
  • the lower limit of the C content of the weld metal is 0.02% by mass, preferably 0.03% by mass, and more preferably 0.04% by mass.
  • the upper limit of the C content of the weld metal is 0.08% by mass, and preferably 0.07% by mass. If the C content of the weld metal is smaller than the lower limit, a predetermined strength may not be obtained after SR annealing. Conversely, if the C content of the weld metal exceeds the above upper limit, the grain boundary carbides become coarse during SR annealing, and the toughness of the weld metal may be reduced.
  • Si (silicon)] Si is an element that ensures the strength of the weld metal after SR annealing.
  • the lower limit of the Si content of the weld metal is 0.10% by mass, preferably 0.12% by mass, and more preferably 0.15% by mass.
  • the upper limit of the Si content of the weld metal is 0.30 mass%, preferably 0.25 mass%, and more preferably 0.20 mass%. If the Si content of the weld metal is smaller than the lower limit, a predetermined strength may not be obtained after SR annealing.
  • the Si content of the weld metal exceeds the above upper limit, it promotes temper embrittlement during SR annealing and promotes the formation of a hard second phase that adversely affects low-temperature toughness. There is a risk of lowering.
  • Mn is an element that forms an oxide serving as a starting point for generating a microstructure during welding and improves the strength and low-temperature toughness of the weld metal.
  • the lower limit of the Mn content of the weld metal is 1.20% by mass, preferably 1.30% by mass, and more preferably 1.40% by mass.
  • the upper limit of the Mn content of the weld metal is 2.0 mass%, preferably 1.8 mass%, and more preferably 1.7 mass%. If the Mn content of the weld metal is smaller than the lower limit, oxides are hardly formed, and the strength and low temperature toughness of the weld metal may not be sufficiently improved. Conversely, if the Mn content of the weld metal exceeds the above upper limit, temper embrittlement during SR annealing is promoted, and the toughness of the weld metal may be reduced.
  • Ni is an element effective for improving the low temperature toughness of the weld metal.
  • the lower limit of the Ni content of the weld metal is 0.50 mass%, preferably 0.60 mass%, and more preferably 0.70 mass%.
  • the upper limit of the Ni content of the weld metal is 3.00% by mass, preferably 2.80% by mass, and more preferably 2.60% by mass. If the Ni content of the weld metal is smaller than the lower limit, the low temperature toughness of the weld metal may not be sufficiently improved. Conversely, if the Ni content of the weld metal exceeds the upper limit, it is considered that the weld metal may not obtain a predetermined toughness after SR annealing, such as lowering the upper shelf energy in the Charpy test.
  • [Cr (chrome)] Cr is an element having an effect of refining grain boundary carbides during SR annealing.
  • the Cr content may be 0% by mass. Therefore, the lower limit of the Cr content of the weld metal is 0% by mass, preferably 0.20% by mass, and more preferably 0.30% by mass.
  • the upper limit of the Cr content of the weld metal is 0.70 mass%, preferably 0.65 mass%, and more preferably 0.60 mass%.
  • the grain boundary carbides are not refined during SR annealing, and the toughness of the weld metal may not be sufficiently improved. Conversely, if the Cr content of the weld metal exceeds the upper limit, the grain boundary carbides are coarsened and the toughness of the weld metal may be lowered.
  • Mo molecular (molybdenum)
  • Mo is an element that suppresses coarsening and annealing softening of grain boundary carbides by fine precipitation in the weld metal grains.
  • the lower limit of the Mo content of the weld metal is 0.10% by mass, preferably 0.20% by mass, and more preferably 0.30% by mass.
  • the upper limit of the Mo content of the weld metal is 0.70 mass%, preferably 0.65 mass%, and more preferably 0.60 mass%. If the Mo content of the weld metal is smaller than the lower limit, coarsening of grain boundary carbides and annealing softening may not be sufficiently suppressed. Conversely, if the Mo content of the weld metal exceeds the upper limit, the strength of the weld metal is excessively increased by precipitating fine carbides during SR annealing, which may reduce the toughness at low temperatures. is there.
  • Ti is an element that forms an oxide serving as a starting point for generating a microstructure during welding and improves the toughness of the weld metal.
  • the lower limit of the Ti content of the weld metal is 0.04% by mass, preferably 0.05% by mass, and more preferably 0.055% by mass.
  • the upper limit of the Ti content of the weld metal is 0.08 mass%, preferably 0.075 mass%, and more preferably 0.07 mass%. If the Ti content of the weld metal is smaller than the lower limit, an oxide is hardly formed, and the toughness of the weld metal may not be sufficiently improved. On the other hand, if the Ti content of the weld metal exceeds the upper limit, the strength of the weld metal is excessively increased by precipitating fine carbides during SR annealing, thereby reducing the toughness at low temperatures. is there.
  • [B (boron)] B is an element that suppresses the formation of grain boundary ferrite that adversely affects the strength and toughness of the weld metal.
  • the lower limit of the B content of the weld metal is 0.0010% by mass, preferably 0.0012% by mass, and more preferably 0.0015% by mass.
  • the upper limit of the B content of the weld metal is 0.0050 mass%, preferably 0.0045 mass%, and more preferably 0.0040 mass%. If the B content of the weld metal is smaller than the above lower limit, the formation of grain boundary ferrite cannot be sufficiently suppressed, and the predetermined strength and toughness of the weld metal may not be ensured. Conversely, if the B content of the weld metal exceeds the upper limit, the strength of the weld metal may increase excessively and the toughness may decrease.
  • [O (oxygen)] O is an element that forms an oxide serving as a starting point for generating a microstructure during welding and improves the toughness of the weld metal.
  • the lower limit of the O content of the weld metal is 0.030% by mass, preferably 0.035% by mass, and more preferably 0.040% by mass.
  • the upper limit of the O content of the weld metal is 0.100% by mass, preferably 0.080% by mass, and more preferably 0.060% by mass. If the O content of the weld metal is smaller than the lower limit, oxides are not sufficiently formed, and the predetermined toughness of the weld metal may not be ensured. On the other hand, when the O content of the weld metal exceeds the upper limit, the oxide is coarsened, and the toughness of the weld metal may be reduced.
  • N (nitrogen) N is an element inevitably contained in the weld metal, and it is industrially impossible to make its content 0 mass%. Therefore, the N content of the weld metal is more than 0% by mass.
  • the upper limit of the N content of the weld metal is 0.015% by mass, preferably 0.010% by mass, and more preferably 0.008% by mass. When the N content of the weld metal exceeds the upper limit, the toughness of the weld metal may be reduced.
  • Nb and V are elements that suppress coarsening of grain boundary carbides.
  • the lower limit of the total content of Nb and V in the weld metal is 0.008% by mass, preferably 0.010% by mass, and more preferably 0.012% by mass.
  • the upper limit of the total content of Nb and V in the weld metal is 0.05% by mass, preferably 0.045% by mass, and more preferably 0.040% by mass. If the total content of Nb and V is smaller than the above lower limit, coarsening of grain boundary carbides may not be sufficiently suppressed. On the other hand, if the total content of Nb and V exceeds the upper limit, the strength of the weld metal is excessively increased by precipitation of fine carbides during SR annealing, which may reduce toughness at low temperatures. is there.
  • the weld metal has C, Si, Mn, Ni, Cr, Mo, Ti, B, O, N, Nb, and V as basic components. Moreover, the said weld metal contains Fe and an unavoidable impurity in the remainder other than the said basic component.
  • the inevitable impurities for example, inclusion of elements such as P (phosphorus), S (sulfur), and Sn (tin) brought in depending on the status of raw materials, materials, manufacturing facilities, and the like is allowed.
  • P is an element that remarkably promotes temper embrittlement during SR annealing, so it is preferably suppressed to at least 0.010% by mass or less.
  • the weld metal may contain, for example, Cu as another element other than the basic component.
  • Cu is an element useful for ensuring the strength of the weld metal.
  • As Cu content of the said weld metal more than 0 mass% is preferable, and 0.05 mass% is preferable as a minimum of Cu content, and 0.10 mass% is more preferable.
  • the upper limit of the Cu content of the weld metal is preferably 1.0% by mass, and more preferably 0.8% by mass. If the Cu content of the weld metal is smaller than the above lower limit, the effect of improving the strength of the weld metal may be insufficient. Conversely, if the Cu content of the weld metal exceeds the upper limit, the strength of the weld metal may be excessively increased, leading to a decrease in toughness.
  • the weld metal may contain Co as an element other than the basic component.
  • Co is an element useful for ensuring the strength of the weld metal.
  • the Co content of the weld metal is preferably more than 0% by mass, and the lower limit of the Co content is preferably 0.05% by mass, more preferably 0.10% by mass.
  • the upper limit of the Co content of the weld metal is preferably 1.0% by mass, and more preferably 0.8% by mass. If the Co content of the weld metal is less than the lower limit, the effect of improving the strength of the weld metal may be insufficient. On the contrary, if the Co content of the weld metal exceeds the upper limit, the strength of the weld metal may be excessively increased and the toughness may be reduced.
  • the weld metal may contain Al as an element other than the basic component.
  • Al is an element that forms an oxide serving as a starting point for generating a microstructure during welding and improves the strength and toughness of the weld metal.
  • the Al content of the weld metal is preferably more than 0% by mass, and the lower limit of the Al content is preferably 0.005% by mass and more preferably 0.010% by mass.
  • the upper limit of the Al content of the weld metal is preferably 0.030% by mass, more preferably 0.025% by mass, and still more preferably 0.020% by mass.
  • the Al content of the weld metal is smaller than the lower limit, oxides are not sufficiently formed, and the effect of improving the strength and toughness of the weld metal may be insufficient. On the contrary, when the Al content of the weld metal exceeds the upper limit, the oxide is coarsened and the toughness of the weld metal may be lowered.
  • the Cu, Co, and Al may be contained singly or in combination.
  • X value ([Mo] + [Ti] + [Nb] + 2 ⁇ [V]) / [C] (1)
  • FCW flux cored wire
  • the welding material component is naturally limited by the required welding metal component, and in order to obtain a predetermined carbide form, the welding conditions and the welding material component must be appropriately controlled.
  • the contents [mass%] of C, Mo, Ti, Nb, and V are set to [C], [Mo], [Ti], [Nb], and [V], respectively.
  • the degree of influence of toughness reduction at low temperatures can be defined by the Y value of the following formula (2).
  • the lower limit of the Y value is preferably 12, and more preferably 12.5.
  • the upper limit of the Y value is preferably 20, and more preferably 19.5. If the Y value is smaller than the above lower limit, the growth of carbides in the grains tends to be inhibited, and the carbides in the grains may be refined.
  • Y value ⁇ [Mo] + ([Ti] -4) + [Nb] + 2 ⁇ [V] ⁇ / [C] (2)
  • the lower limit of the ratio of metal Si content [% by mass] to SiO 2 content [% by mass] of the flux cored wire is preferably 0.90, more preferably 0.93, and 1.00. Is more preferable.
  • the upper limit of the ratio is preferably 3.0 and more preferably 2.5. If the ratio is less than the lower limit, the solute Si is insufficient, leading to instability of the carbide, and the grain equivalent carbide size is increased to increase the mean equivalent circle diameter of the grain boundary carbide having a circle equivalent diameter of 0.40 ⁇ m or more. May not be kept below the above upper limit. Conversely, if the ratio exceeds the upper limit, workability during welding may be reduced.
  • the lower limit of the heat input is preferably 0.7 kJ / mm, more preferably 1.0 kJ / mm.
  • the upper limit of the heat input is preferably 2.5 kJ / mm, more preferably 2.0 kJ / mm, and still more preferably 1.6 kJ / mm. If the heat input is less than the lower limit, the construction efficiency during welding may be reduced. Conversely, if the heat input exceeds the above upper limit, the cooling rate during welding decreases and the strength of the predetermined weld metal cannot be obtained, and carbide is generated during cooling, and this carbide grows during SR annealing. Therefore, the desired grain boundary carbide form may not be obtained. As a result, the toughness of the weld metal after SR annealing may be reduced.
  • the lower limit of the preheating temperature and the interpass temperature is preferably 100 ° C., more preferably 120 ° C.
  • an upper limit of preheating temperature and interpass temperature 180 degreeC is preferable and 160 degreeC is more preferable. If the preheating temperature and the interpass temperature are smaller than the lower limits, there is a risk that low temperature cracking is likely to occur. Conversely, if the preheating temperature and the interpass temperature exceed the above upper limits, the cooling rate at the time of welding decreases, and the strength of the predetermined weld metal cannot be obtained, and carbide is generated during cooling, and this carbide is subjected to SR annealing. Occasionally, the desired grain boundary carbide form may not be obtained by growing. As a result, the toughness of the weld metal after SR annealing may be reduced.
  • annealing conditions such as SR annealing temperature and SR annealing time, what is necessary is just to follow according to the conditions currently performed conventionally, but from a viewpoint of control of a grain boundary carbide, these conditions can be set as follows. preferable.
  • the lower limit of the SR annealing temperature is preferably 580 ° C., more preferably 600 ° C.
  • an upper limit of SR annealing temperature 680 degreeC is preferable and 650 degreeC is more preferable. If the SR annealing temperature is lower than the lower limit, the stress generated during welding may not be sufficiently removed. Conversely, if the SR annealing temperature exceeds the above upper limit, coarsening of the grain boundary carbide during SR annealing is promoted and a desired grain boundary carbide form cannot be obtained, and as a result, the toughness of the weld metal after SR annealing is increased. May decrease.
  • the lower limit of the SR annealing time is preferably 2 hours, and more preferably 3 hours.
  • the upper limit of the SR annealing time is preferably 12 hours, and more preferably 10 hours. If the SR annealing time is smaller than the lower limit, the stress generated during welding may not be sufficiently removed. Conversely, if the SR annealing time exceeds the above upper limit, coarsening of the grain boundary carbide during SR annealing is promoted and the desired grain boundary carbide form cannot be obtained, and as a result, the toughness of the weld metal after SR annealing is increased. May decrease.
  • the weld structure has the weld metal.
  • the welded structure having the weld metal is obtained by welding a predetermined member under the welding conditions. Since the weld structure includes the weld metal, high strength and high toughness at ⁇ 60 ° C. or less can be ensured. As a result, the reliability and durability of the welded structure used during the drilling and production of the subsea oil field are improved.
  • the weld metal has an average equivalent circle diameter of 0.10 ⁇ m or more for carbides having an equivalent circle diameter of less than 0.40 ⁇ m in the grains, the toughness at low temperature is stable and high toughness at ⁇ 60 ° C. or less is obtained. .
  • a plurality of flux cored wires having a wire diameter of ⁇ 1.2 mm and a flux filling rate of 15.5% by mass were produced.
  • 31 types of flux cored wires of welding materials 3F1 to 3F31 having different composition components were produced.
  • “Others” is the balance and is the content of Fe and inevitable impurities.
  • “-” indicates that the component is not contained.
  • an SM490A steel plate having an average plate thickness of 20 mm processed into a groove shape shown in FIG. 1-No. 32 weld metals were obtained.
  • the groove angle is 20 ° in a V shape
  • the root interval is 16 mm
  • the welding posture is downward
  • the heat input condition is one of the following
  • the preheating temperature and the interpass temperature are 140 ° C. or higher and 190 ° C. or lower.
  • each of the produced weld metals was subjected to a heat treatment with an SR annealing temperature of 620 ° C. or more and 680 ° C. or less and an SR annealing time of 2 hours or more and 8 hours or less.
  • Table 2 shows the welding conditions of each of the produced weld metals. A) 1.0kJ / mm, 230A-25V, 5.7mm / sec B) 1.6kJ / mm, 280A-29V, 5.1mm / sec C) 2.0 kJ / mm, 280A-29V, 4.1 mm / sec
  • a straight line Ai 1, 2, 3,... N, n: total number of straight lines intersecting with at least three carbides having a circle equivalent diameter of 0.40 ⁇ m or more and having a length of 6 ⁇ m.
  • a region B indicated by a broken-line circle indicates a standard of the size of the target carbide, and is an imaginary size of a perfect circle having a diameter of 0.40 ⁇ m. is there.
  • the filled area C indicates carbide with an equivalent circle diameter of 0.40 ⁇ m or more
  • the shaded area D indicates carbide with an equivalent circle diameter of less than 0.40 ⁇ m. Yes.
  • the straight line shown with the broken line of FIG. 2B is a straight line exceeding 6 micrometers in length.
  • a straight line that intersects only two or less carbides having a circle equivalent diameter of 0.40 ⁇ m or more among straight lines having a length of 6 ⁇ m is not included in the straight line Ai.
  • a straight line A1 shown in FIG. 2B is a straight line intersecting with the carbides 1, 2, and 3.
  • the straight line A2 is a straight line that intersects with the carbides 2, 3, and 4
  • the straight line A3 is a straight line that intersects with the carbides 3, 4, and 5
  • the straight line A4 is a straight line that intersects with the carbides 4, 5, and 6,
  • the straight line A5 is the carbides 5, 8, and A straight line that intersects with carbides 8, 9, and 10, a straight line A7 that intersects with carbides 8, 9, 10, and 11, and a straight line A8 that intersects with carbides 8, 6, and 7, respectively.
  • Table 2 shows the results of the average equivalent circle diameter of the grain boundary carbides calculated by this method.
  • the average equivalent circle diameter is It is evaluated as satisfying “0.75 ⁇ m or less”.
  • the absorbed energy vE ⁇ 40 and vE ⁇ 60 at ⁇ 40 ° C. and ⁇ 60 ° C. shown in Table 2 are both average values of three measurements. Further, the absorbed energy vE ⁇ 40 at ⁇ 40 ° C. is shown as a reference, and it can be judged that those exceeding 60 J are excellent in toughness at a relatively low temperature.
  • No. 1 satisfies the range of the composition component of the present invention, and the form of carbide in the grains and at the grain boundaries satisfies the definition of the present invention.
  • the weld metal of No. 20 has a tensile strength TS exceeding 620 MPa and an absorption energy vE ⁇ 60 at ⁇ 60 ° C. exceeding 40 J, and it can be said that both strength and low temperature toughness can be achieved at a high level after SR annealing. Further, these weld metals have an absorption energy vE ⁇ 40 at ⁇ 40 ° C. exceeding 60 J, and it can be seen that sufficient toughness can be obtained even in a temperature range of ⁇ 40 ° C.
  • 21-No. No. 30 has an absorption energy vE ⁇ 60 at ⁇ 60 ° C. of 40 J or less, and it can be seen that sufficient toughness cannot be obtained at low temperatures.
  • the average equivalent circle diameter of carbide with an equivalent circle diameter of less than 0.40 ⁇ m is as small as 0.05 ⁇ m, so the absorbed energy vE ⁇ 60 at ⁇ 60 ° C. is 40 J or less, and sufficient toughness at low temperature is obtained. It is thought that it was not obtained.
  • the weld metal and welded structure have high strength after SR annealing and high toughness at ⁇ 60 ° C. or less in gas shielded arc welding using a flux cored wire. It can be suitably used as an offshore structure or the like that is constructed during the drilling and production of a subsea oil field.
  • Carbide A1 to A8 Straight line B True circle C having a diameter of 0.40 ⁇ m Carbide having an equivalent circle diameter of 0.40 ⁇ m or more D Carbide having an equivalent circle diameter of less than 0.40 ⁇ m

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Abstract

Le métal soudé de la présente invention contient des quantités spécifiques de C, Si, Mn, Ni, Cr, Mo, Ti, B, O, N et Nb + V, respectivement, le reste étant constitué de Fe et d'impuretés inévitables. Dans ce métal soudé, les carbures comportant des diamètres de cercle équivalent inférieurs à 0,40 µm présentent un diamètre moyen de cercle équivalent supérieur ou égal à 0,10 µm, et les carbures intergranulaires comportant des diamètres de cercle équivalent supérieurs ou égaux à 0,40 µm présentent un diamètre moyen de cercle équivalent inférieur ou égal à 0,75 µm.
PCT/JP2016/066442 2015-06-05 2016-06-02 Métal soudé et structure soudée WO2016195028A1 (fr)

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CN201680032091.4A CN107614189A (zh) 2015-06-05 2016-06-02 焊接金属和焊接结构体
EP16803462.7A EP3305463A4 (fr) 2015-06-05 2016-06-02 Métal soudé et structure soudée
US15/579,483 US20180147674A1 (en) 2015-06-05 2016-06-02 Welded metal and welded structure
KR1020177034938A KR20180002791A (ko) 2015-06-05 2016-06-02 용접 금속 및 용접 구조체

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CN110434507A (zh) * 2019-08-22 2019-11-12 华南理工大学 一种用于海洋工程的水下增材修复金属丝材

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JP2008068274A (ja) * 2006-09-12 2008-03-27 Kobe Steel Ltd 低温靭性に優れた高強度溶接金属
WO2014104731A1 (fr) * 2012-12-27 2014-07-03 주식회사 포스코 Joint soudé à l'arc au fil fourré ultrarésistant présentant une excellente ténacité aux chocs et fil de soudage pour sa fabrication
JP2014195832A (ja) * 2013-03-08 2014-10-16 株式会社神戸製鋼所 溶接金属

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Publication number Priority date Publication date Assignee Title
JP2008068274A (ja) * 2006-09-12 2008-03-27 Kobe Steel Ltd 低温靭性に優れた高強度溶接金属
WO2014104731A1 (fr) * 2012-12-27 2014-07-03 주식회사 포스코 Joint soudé à l'arc au fil fourré ultrarésistant présentant une excellente ténacité aux chocs et fil de soudage pour sa fabrication
JP2014195832A (ja) * 2013-03-08 2014-10-16 株式会社神戸製鋼所 溶接金属

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110434507A (zh) * 2019-08-22 2019-11-12 华南理工大学 一种用于海洋工程的水下增材修复金属丝材
CN110434507B (zh) * 2019-08-22 2021-11-09 华南理工大学 一种用于海洋工程的水下增材修复金属丝材

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