CN100519049C - Cored wire for gas protective arc welding for high tensile strength steel - Google Patents
Cored wire for gas protective arc welding for high tensile strength steel Download PDFInfo
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- CN100519049C CN100519049C CNB2006101320515A CN200610132051A CN100519049C CN 100519049 C CN100519049 C CN 100519049C CN B2006101320515 A CNB2006101320515 A CN B2006101320515A CN 200610132051 A CN200610132051 A CN 200610132051A CN 100519049 C CN100519049 C CN 100519049C
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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
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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
- B23K35/36—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
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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
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/406—Filled tubular wire or rods
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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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- 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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- 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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- Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
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- Organic Chemistry (AREA)
- Nonmetallic Welding Materials (AREA)
Abstract
Cored wire for gas protective arc welding for high tensile strength steel includes: 0.04-0.11 w% C, 0.1-0.75 w% Si, 1.30-2.50w% Mn, 0.10-2.50w% Ni, 0.10-1.00w% Cr, 0.10-1.00w% Mo, 0.06-0.30w% Ti, less than 90w% Fe and not larger than 0.0150w% N. The element contents satisfy the following formula: F(X)=-576.9[C]+80.1[Mn]+1.5[Ni]-22.8[Cr]-6.8[Mo]-83.1[Ti]>=100. The cored wire with the proof stress higher than 620 Pa has very low temperature excellent crack resistance at -60 Degree and excellent low-temperature flexibility to endow the weld metal and welding operability.
Description
Technical field
The present invention relates to be used for the flux cored wire of the gas shielded arc welding of high-tensile-strength steel, more specifically, the present invention relates to be used to have flux cored wire greater than the gas shielded arc welding of the high-tensile-strength steel of the proof stress of 620MPa.
Background technology
Recently, steel building is because they become than bigger and require weight reduction in the past, and this requirement has been satisfied in the use of high-tensile-strength steel.Demand for the welding material that is fit to low-temperature flexibility is increasing day by day, and described low-temperature flexibility is essential in the field of marine structure and pressure vessel.This welding material is designed to shielded arc welding and submerged-arc welding.Yet still there are problems such as efficient, operability, welding position in these welding methods.This situation has caused satisfying the flux cored wire of the demand of high efficiency, low-temperature flexibility and good operability.
Various types of powder-cored welding wires have been developed up to now.One of them is the disclosed flux cored wire that is used for the gas shielded arc welding of high-tensile-strength steel (tensile strength with 690MPa) among the Japanese patent application publication No. H9-253886.Described flux cored wire comprises the TiO with specified amount
2, metal fluoride, magnesium and other alloy compositions, so good welding operability not only is being provided but also good high-temperature intensity and low-temperature flexibility is being provided behind the PWHT (post weld heat treatment) for a long time.
The another kind of flux cored wire that is used for the gas shielded arc welding of high-tensile-strength steel is disclosed in Japanese patent application publication No. H3-47695.Described flux cored wire contains mainly by TiO
2, the titanium dioxide type solder flux formed of MgO and MnO, wherein TiO
2The content of/MgO ratio and alloy compositions is suitably stipulated, makes it that good welding operability and toughness is provided.
Disclosing another at Japanese patent application publication No. H8-174275 is used for high-tensile-strength steel and (has greater than 680N/mm
2Tensile strength) the flux cored wire of gas shielded arc welding.Because it has the alloy compositions and the Ta of proper content, although the heat input range is wide, it allows to operate efficiently and provide excellent toughness and the high strength suitable with parent metal.
Summary of the invention
According to the low-temperature flexibility of testing disclosed welding wire in all above-mentioned patent documents at-30 to-40 ℃ Charpy's impact value.This probe temperature is not suitable for standing marine structure and other building of extremely low temperature.Be absolutely necessary in the test for example-60 ℃ of low temperature more.In above-mentioned patent document, all do not mention low temperature (-60 ℃ approximately) toughness.
Disclosed welding wire comprises a large amount of slag formers so that produce a large amount of slags when welding in Japanese patent application publication No. H9-253886 and H3-47695.This need remove the additional step of slag, thereby has reduced welding efficiency.Although Ti produced a kind of component of slag and welding efficiency is played an important role in when welding, Japanese patent application publication No. H8-174275 has stipulated to be used to improve the amount of the metal dust of welding efficiency, and does not stipulate Ti content.
Up to now, have no talent and successfully develop the flux cored wire of such gas shielded arc welding that is used for high-tensile-strength steel, described flux cored wire has good toughness and crack resistance under low-down temperature, and can improve the welding operability.
The present invention considers aforementioned and finishes.An object of the present invention is to provide new being used to and have flux cored wire greater than the gas shielded arc welding of the high-tensile-strength steel of the proof stress of 620MPa.Described flux cored wire will be given weld metal at good resistance fragility and good low-temperature toughness under extremely low temperature is for example made an appointment with-60 ℃, and have excellent welding operability.
The present invention relates to be used for the flux cored wire of the gas shielded arc welding of high-tensile-strength steel, described flux cored wire comprises based on the welding wire total amount:
C:0.04 to 0.11 quality %,
Si:0.40 to 0.75 quality %,
Mn:1.30 to 2.50 quality %,
Ni:0.10 to 2.50 quality %,
Cr:0.10 to 1.00 quality %,
Mo:0.10 to 1.00 quality %,
Ti:0.06 to 0.30 quality %,
Fe: be not less than 90 quality %,
N: be not more than 0.0150 quality %,
Represent respectively that at [C], [Si], [Mn], [Ni], [Cr], [Mo] and [Ti] under the situation of content separately of C, Si, Mn, Ni, Cr, Mo and Ti, every kind of constituent content in quality % of total amount satisfies following formula in expression covering and the powder core:
F(x)＝-576.9[C]+34.1[Si]+80.1[Mn]+1.5[Ni]-22.8[Cr]-6.8[Mo]-83.1[Ti]≥100。
Aforementioned content represents to form the amount of the regulation element of the compound that adds welding wire.For example, from adding the SiO of welding wire
2(etc.) amount calculate Si content.
＜effect of the present invention 〉
According to the present invention, be used for high-tensile-strength steel gas shielded arc welding flux cored wire will in addition under for example about-60 ℃ of extremely low temperature also excellent low-temperature flexibility and crack resistance give weld metal.Described flux cored wire also has good welding operability and operating efficiency.
Description of drawings
Fig. 1 shows F (x) value and the figure that concerns between-60 ℃ Charpy's impact value (vE-60 ℃ (J)).
The specific embodiment
Below the present invention will be described in more detail.For addressing the above problem, the present inventor has studied the alloy compositions of the flux cored wire of effective raising low-temperature flexibility.As a result of, they find to have relation between the low-temperature flexibility of the amount of the alloy compositions in the welding wire and weld metal.Obviously, the low-temperature flexibility of weld metal depends on the acting in conjunction of alloy compositions.Studied single alloy compositions to the influence of low-temperature flexibility and with its empirical ground formulism.The result is as follows.
In other words, the relation between the low-temperature flexibility of the amount of the alloy compositions in the welding wire and weld metal is expressed from the next.
F(x)＝-576.9[C]+34.1[Si]+80.1[Mn]+1.5[Ni]-22.8[Cr]-6.8[Mo]-83.1[Ti]≥100
Wherein [C], [Si], [Mn], [Ni], [Cr], [Mo] and [Ti] represent the content of C in the welding wire, Si, Mn, Ni, Cr, Mo and Ti respectively.Have only F (x) value to be not less than 100, welding wire just will for example make an appointment with-60 ℃ of excellent down low-temperature flexibilities to give weld metal at extremely low temperature.
When increasing C, Cr, Ti and Mo content (the particularly content of C and Ti) in welding wire, the toughness of being welded the weld metal that forms by high-tensile-strength steel (having the proof stress that is higher than 620MPa) trends towards reducing.
The increase of Ti content causes the increase of solid solution Ti content in the weld metal, thereby causes separating out of in heat part (or the weld metal part that heats by follow-up approach) again TiC.TiC separates out the nucleation ability of having aggravated, thereby makes layer (course) lath-shaped bainite preponderate, and this causes the obvious reduction of toughness.Thereby increase C content and produce island martensite body reduction toughness.
On the contrary, Si, Mn and Ni trend towards increasing toughness.Particularly, Si and Mn reduce the oxygen content in the weld metal, thereby toughness is had contribution.
When having only welding wire to be included in according to the alloy compositions suitably selected in the appropriate amount of above-mentioned discovery, the present invention just produces its effect.Owing to following reason is selected alloy compositions and is quantized.The following every kind of components contents that provides in welding wire total amount (quality %) as the basis.Flux cored wire according to the present invention is made up of ladle layer and powder core wherein, and in covering and the core one or two comprises any following component.
C:0.04 to 0.11 quality %
C is the component very big to the intensity effect of weld metal.Under situation, can not get proof stress greater than 620MPa less than the amount of 0.04 quality %.Therefore, the amount of C should be not less than 0.04 quality %, more preferably is not less than 0.06 quality %.Under situation, make weld metal very responsive to cold cracking greater than the amount of 0.11 quality %.Therefore, the amount of C should be not more than 0.11 quality %, more preferably no more than 0.10 quality %.
Si:0.40 to 0.75 quality %
Si plays a part deoxidier, promptly reduces the oxygen content of weld metal, and keeps the intensity of weld metal.Under the situation less than the amount of 0.40 quality %, deoxidation is carried out not thoroughly, thereby produces the toughness of bubble and difference.Therefore, the amount of Si should be not less than 0.40 quality %, more preferably is not less than 0.50 quality %.Under situation, produce and the inconsistent viscosity weld metal of parent metal, thereby reduce the welding operability greater than the amount of 0.75 quality %.Therefore, the amount of Si should be not more than 0.75 quality %, more preferably no more than 0.60 quality %.
Mn:1.30 to 2.50 quality %
The similar Si of Mn plays a part deoxidier.It also improves the toughness of weld metal.Under the situation less than the amount of 1.20 quality %, deoxidation is carried out not thoroughly, produces the toughness of bubble and difference.Therefore, the amount of Mn should be not less than 1.30 quality %, more preferably is not less than 1.80 quality %.Under the situation greater than the amount of 2.50 quality %, but intensity increases makes weld metal more responsive to cold cracking.Therefore, the amount of Mn should be not more than 2.50 quality %, more preferably no more than 2.10 quality %.
Ni:0.10 to 2.50 quality %
Ni is to the intensity of weld metal and the far-reaching component of toughness.Under situation, abundant raising toughness there is not help less than the amount of 0.10 quality %.Therefore, the amount of Ni should be not less than 0.10 quality %, more preferably is not less than 0.50 quality %.Under situation, be easy to cause hot tearing greater than the amount of 2.50 quality %.Therefore, the amount of Ni should be not more than 2.50 quality %, more preferably no more than 2.00 quality %.
Cr:0.10 to 1.00 quality %
Cr always has contribution to intensity.Under situation, can not get enough intensity less than the amount of 0.10 quality %.Therefore, the amount of Cr should be not less than 0.10 quality %.Under the situation greater than the amount of 1.00 quality %, the intensity increase is very big, but reduces toughness and cause cold cracking.Therefore, the amount of Cr should be not more than 1.00 quality %, more preferably no more than 0.60 quality %.
Mo:0.10 to 1.00 quality %
Mo always has contribution to intensity, reduces granularity and improves low-temperature flexibility.Under situation less than the amount of 0.10 quality %, can not get enough intensity, do not produce the effect of grain refinement yet, thereby cause low toughness.Therefore, the amount of Mo should be not less than 0.10 quality %, more preferably is not less than 0.20 quality %.Under situation, cause tangible sclerosis, thereby reduce toughness greater than the amount of 1.00 quality %.Therefore, the amount of Mo should be not more than 1.00 quality %, more preferably no more than 0.60 quality %.
Ti:0.06 to 0.30 quality %
Ti reduces granularity, but produces slag when its excessive existence.Under situation, can not reduce granularity as required, thereby cause the low-temperature flexibility of difference less than the amount of 0.06 quality %.Therefore, the amount of Ti should be not less than 0.06 quality %, more preferably is not less than 0.10 quality %.Under situation greater than the amount of 0.30 quality %, produce slag, need to remove the additional step of slag, thereby reduce production efficiency.Therefore, the amount of Ti should be not more than 0.30 quality %, more preferably no more than 0.25 quality %.
Mention along band, should preferably add Ti with the form of metal or alloy (as Fe-Ti).The Ti that adds with oxide form produces a large amount of slags, and its removing needs additional step, thereby reduces production efficiency.On the contrary, the Ti that adds with the metal or alloy form produces few molten slag, thereby can effectively carry out the welding of downhand welding or horizontal level.
N: be not more than 0.015 quality %
Initiatively do not add N in the present invention.Yet flux cored wire comprises the N from the solder flux raw material of certain content.Under situation, trend towards producing bubble greater than the amount of 0.015 quality %.Therefore, the amount of N should be not more than 0.015 quality %, more preferably no more than 0.010 quality %.
Mainly form according to the surplus of the said components of flux cored wire of the present invention by the Fe that is present in the Fe alloy (as Fe-Si, Fe-Mn, Fe-Cr, Fe-Mo and Fe-Ti) in ladle layer and the solder flux wherein and derives from iron powder.Fe accounts for the 90 quality % that are higher than of welding wire total amount, more preferably is higher than 93 quality %.Fe content greater than 90 quality % provides high deposition.In addition, can extra packet alkali metal containing fluoride according to flux cored wire of the present invention and oxide, alkali earth metal fluoride and oxide, B, Al, Mg etc.
The content of alloying element is stipulated by following formula.
F(x)＝-576.9[C]+34.1[Si]+80.1[Mn]+1.5[Ni]-22.8[Cr]-6.8[Mo]-83.1[Ti]≥100
This formula is represented the dependence of the low-temperature flexibility of weld metal to alloying element content.It is to add up and obtain by the weld metal that is obtained by dozens of welding wire sample being carried out Xia Shi shock-testing (at-60 ℃), and each welding wire sample comprises C, Si, Mn, Ni, Cr, Mo, Ti, Fe, the N of following regulation and other.
C:0.03 to 0.15 quality %,
Si:0.32 to 0.89 quality %,
Mn:1.18 to 2.65 quality %,
Ni:0.04 to 2.75 quality %,
Cr:0.05 to 1.20 quality %,
Mo:0.04 to 1.21 quality %,
Ti:0.03 to 0.36 quality %,
Fe:92.1 to 96.1 quality %,
N:0.0010 to 0.0150 quality %,
Other: 0.10 to 3.25 quality %
(other comprises B, Na, F, K, Li, Al, Ca, Mg, P and S).
F (x) value is proportional with the low-temperature flexibility of weld metal.Factor before the content of every kind of alloying element is represented the influence degree of every kind of alloying element to the low-temperature flexibility of weld metal.In other words, this factor is big more, and alloying element is big more to the influence of low-temperature flexibility, and vice versa.Negative factor represents that the alloying element that relates to it has negative effect to low-temperature flexibility.In the experiment of using dozens of welding wire sample, the contribution that improves according to alloying element pair and the proportional low-temperature flexibility of its amount how much, determine the factor among the formula F (x).
Obtain F (x) value of each welding wire sample, with its index as the low-temperature flexibility that obtains when suitably adjusting the amount of every kind of alloying element, and the value that will obtain thus is to Charpy's impact value (the be abbreviated as vE-60 ℃) mapping of sample at-60 ℃.The results are shown among Fig. 1.From Fig. 1, notice, between F (x) and vE-60 ℃, have linear relationship.The value of vE-60 ℃ 〉=50J shows good low-temperature flexibility in the zone of F (x) 〉=100.Thereby confirm that F (x) value can accurately be predicted the composition of the flux-cored wire for gas shielded arc welding that is used for high strength steel and by the relation between the low-temperature flexibility of its weld metal that forms.
Should comprise its amount according to flux cored wire of the present invention is 10 to 30% the solder flux that enough is used for common flux cored wire.Amount less than 10% for solder flux very little, to such an extent as to itself can not supply with essential alloying element.From covering, add the increase that alloying element causes cost of material.In addition and alloying element in conjunction with improving covering intensity, thereby but reduce the stringiness of welding wire, this is unfavorable to production cost.On the contrary, contain greater than the covering of the welding wire of 30% excess flux thin, thereby but have poor stringiness (frequent fracture), this is unfavorable to production cost.
Embodiment
With reference to following embodiment and comparative example the present invention is described in more detail.Welding in these embodiments is to carry out under the condition shown in the following table 1.The composition of sample welding wire and F (x) value is shown in Table 2.The composition of the covering of sample welding wire is shown in Table 3.Sample welding wire shown in the table 2 has any in two kinds of coverings (A and B) as shown in table 4.The composition of covering (A and B) is shown in Table 3.The weld metal of preparation HT780 steel under welding condition as shown in table 1.The weld metal cutting is respectively applied for according to the extension test of JIS Z3111 No.A1 and No.A4 and the sample of Xia Shi shock-testing with preparation.Following table 5 shows the result of proof stress (0.2%) test, Xia Shi impact strength and welding operability.
If the weld metal that is formed by the sample welding wire has proof stress that is higher than 620MPa and the Charpy's impact value that is higher than 50J (at-60 ℃), think that then the sample welding wire is satisfactory.
After welding, place after 96 hours under the situation that their liner metal is excised, by the cold cracking of ultrasonic examination (according to JIS Z3060) and magnetic powder inspection (according to JIS G0565) specimen.After this test, under SEM, observe break surface.Under situation with the excision of its liner metal, the also hot tearing by ultrasonic examination (according to JIS Z3060) and radiographic inspection (according to JIS Z3104) specimen.After this test, under SEM, observe break surface.Mention along band, carry out extension test and Xia Shi shock-testing with the test weld metal according to JIS Z3111.
If use the welding efficiency of sample welding wire obviously not enough, then will weld operability and be evaluated as " poor ".
Table 1 (welding condition)
| Welding current (A) | Arc voltage (V) | Bonding speed (mm/min) | Preheating and interlayer temperature (℃) | Heat input (kJ/mm) |
| 280 | 31 | 300 | 150 | 1.7 |
| The composition of protective gas (volume %) | The flow velocity of protective gas (L/min) | Gage of wire (mm) | The welding position | The steel plate that is used to weld |
| Ar/CO 2＝ 80/20 | 25 | 1.2 | Downhand welding | JIS?G312 8SHY685 |
| The thickness of welded steel (mm) | The groove shape | Groove gap (mm) | -- | -- |
| 20 | V，45° | 12 | -- | -- |
Table 2 (component of welding wire)
Table 3
Table 4
Table 5 (test result)
As shown in table 2, the sample welding wire among the embodiment 1 to 14 meets the present invention, and the sample welding wire in the comparative example 15 to 32 is outside scope of the present invention.
Notice that sample welding wire the embodiment 1 to 14 has the proof stress (0.2%) that is higher than 620MPa and greater than the vE-60 ℃ of value of 50J from table 5, these are the enough intensity and the index of significant low-temperature flexibility, and they also have excellent welding operability and crack resistance.
Mention along band, table 5 comprises " other " hurdle, in order to those sample welding wires that only refer to suffer cold cracking or hot tearing in all tested sample welding wires (sample 1 to 32).
On the contrary, notice that the sample welding wire in comparative example 15 (wherein C content is less than 0.04 quality %) and comparative example 23 (wherein Cr content is less than 0.10 quality %) has the proof stress (0.2%) that is lower than 620MPa, this is the index of undercapacity.Be also noted that the sample welding wire in comparative example 16 (wherein C content is greater than 0.11 quality %) and comparative example 24 (wherein Cr content is greater than 1.00 quality %) has the toughness of too high intensity and reduction and suffers cold cracking.
Notice that the sample welding wire in comparative example 17 (wherein Si content is less than 0.40 quality %) and comparative example 19 (wherein Mn content is less than 1.30 quality %) contains numerous air-bubble owing to deoxidation is not enough.Be also noted that sample welding wire and parent metal in comparative example 18 (wherein Si content is greater than 0.75 quality %) are incompatible, thereby cause the welding operability of difference.
Notice that the sample welding wire in comparative example 20 (wherein Mn content is greater than 2.50 quality %) has too high intensity and suffers cold cracking.
Notice that sample welding wire or the sample welding wire in the comparative example 27 (wherein Ti content is less than 0.06 quality %) in comparative example 21 (wherein Ni content is less than 0.10 quality %) have low toughness owing to grain refinement is not enough.On the contrary, notice that the sample welding wire in the comparative example 22 (wherein Ni content is greater than 2.50 quality %) suffers hot tearing.
Notice that the sample welding wire in the comparative example 25 (wherein Mo content is less than 0.10 quality %) has low-intensity (proof stress 0.02% is less than 620MPa) and low toughness owing to grain refinement is not enough.
Notice that the sample welding wire in the comparative example 26 (wherein Mo content is greater than 1.00 quality %) has low toughness owing to weld metal extremely hardens.
Notice that the sample welding wire in the comparative example 28 (wherein Ti content is greater than 0.30 quality %) needs to have poor welding operability for a long time owing to removing a large amount of slags that therefrom produce.
Notice that sample welding wire in the comparative example 29 to 32 (wherein F (x) value is less than 100) has poor low-temperature flexibility (at-60 ℃ Charpy's impact values less than 50J).
Notice in the comparative example 33 (wherein the amount of the big and Fe of the amount of the element except that Fe is less than 90 quality %) the sample welding wire since a large amount of slags and since wherein the minimizing of the plated metal amount of generation have poor welding operability.
Notice that the sample welding wire in the comparative example 34 (wherein the amount of N is greater than 0.015 quality %) contains bubble.
As mentioned above, the sample welding wire in embodiment 1 to 14 according to the invention has good low-temperature flexibility, welding operability and crack resistance.
Claims (1)
1. flux cored wire that is used for the gas shielded arc welding of high-tensile-strength steel, it comprises based on the welding wire total amount:
C:0.04 to 0.11 quality %,
Si:0.40 to 0.75 quality %,
Mn:1.30 to 2.50 quality %,
Ni:0.10 to 2.50 quality %,
Cr:0.10 to 1.00 quality %,
Mo:0.10 to 1.00 quality %,
Ti:0.06 to 0.30 quality %,
Fe: be not less than 90 quality %,
N: be not more than 0.0150 quality %,
Wherein the various content of C, Si, Mn, Ni, Cr, Mo and the Ti that is represented respectively by [C], [Si], [Mn], [Ni], [Cr], [Mo] and [Ti] satisfy following formula:
F(x)＝-576.9[C]+34.1[Si]+80.1[Mn]+1.5[Ni]-22.8[Cr]-6.8[Mo]-83.1[Ti]≥100。
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005322795 | 2005-11-07 | ||
| JP2005322795 | 2005-11-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1962161A CN1962161A (en) | 2007-05-16 |
| CN100519049C true CN100519049C (en) | 2009-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006101320515A Active CN100519049C (en) | 2005-11-07 | 2006-10-23 | Cored wire for gas protective arc welding for high tensile strength steel |
Country Status (6)
| Country | Link |
|---|---|
| KR (1) | KR100821426B1 (en) |
| CN (1) | CN100519049C (en) |
| NL (1) | NL1032551C2 (en) |
| NO (1) | NO344915B1 (en) |
| SE (1) | SE531408C2 (en) |
| SG (1) | SG131885A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101396774B (en) * | 2007-09-30 | 2010-12-08 | 苏派特金属（昆山）有限公司 | Flux-cored wire |
| KR100910493B1 (en) | 2007-12-26 | 2009-07-31 | 주식회사 포스코 | Flux Cored Arc Weld Metal Joint Having Superior CTOD in Low Temperature |
| CN103692114B (en) * | 2013-12-12 | 2016-01-27 | 天津市永昌焊丝有限公司 | A kind of all-position welding ultralow-hydrogen low high-toughness metal powder core flux-cored wire |
| CN110373523B (en) * | 2019-07-16 | 2021-05-11 | 河钢股份有限公司承德分公司 | Heat treatment softening method for steel for 90 kg-grade welding wire |
| KR102302988B1 (en) | 2020-09-25 | 2021-09-17 | 고려용접봉 주식회사 | Flux cored wire |
| CN112496595B (en) * | 2020-12-29 | 2022-11-11 | 中国电建集团上海能源装备有限公司 | Gas shielded welding wire for nuclear power containment vessel and preparation and application thereof |
| CN115558860A (en) * | 2022-10-14 | 2023-01-03 | 成都先进金属材料产业技术研究院股份有限公司 | Welding wire for high-strength steel containing vanadium and niobium, welding wire for high-strength steel and production method of welding wire |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3354460B2 (en) * | 1997-11-11 | 2002-12-09 | 川崎製鉄株式会社 | Covered arc welding method for high strength steel |
| JP3579610B2 (en) * | 1999-03-12 | 2004-10-20 | 株式会社神戸製鋼所 | Weld metal with excellent low temperature toughness |
| KR100520371B1 (en) * | 1999-12-17 | 2005-10-11 | 제이에프이 스틸 가부시키가이샤 | Welding material and method for producing welding joint by using the same and welding joint by the method |
| GC0000233A (en) * | 2000-08-07 | 2006-03-29 | Exxonmobil Upstream Res Co | Weld metals with superior low temperature toughness for joining high strength, low alloy steels |
| JP2005279683A (en) * | 2004-03-29 | 2005-10-13 | Jfe Steel Kk | Flux cored wire for gas shielded arc welding |
-
2006
- 2006-09-21 NL NL1032551A patent/NL1032551C2/en active Search and Examination
- 2006-10-13 SG SG200607171-6A patent/SG131885A1/en unknown
- 2006-10-23 CN CNB2006101320515A patent/CN100519049C/en active Active
- 2006-11-02 SE SE0602313A patent/SE531408C2/en unknown
- 2006-11-06 KR KR1020060108998A patent/KR100821426B1/en active IP Right Grant
- 2006-11-07 NO NO20065113A patent/NO344915B1/en unknown
Non-Patent Citations (1)
| Title |
|---|
| JP特开平8-267273A 0199.10.15 |
Also Published As
| Publication number | Publication date |
|---|---|
| NO20065113L (en) | 2007-05-08 |
| SE531408C2 (en) | 2009-03-24 |
| CN1962161A (en) | 2007-05-16 |
| KR20070049083A (en) | 2007-05-10 |
| NO344915B1 (en) | 2020-06-29 |
| KR100821426B1 (en) | 2008-04-11 |
| NL1032551A1 (en) | 2007-05-08 |
| SG131885A1 (en) | 2007-05-28 |
| NL1032551C2 (en) | 2007-08-07 |
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