CN100525990C - Flux-cored wire for electrogas welding and electrogas welding metal - Google Patents

Flux-cored wire for electrogas welding and electrogas welding metal Download PDF

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CN100525990C
CN100525990C CNB2007101823097A CN200710182309A CN100525990C CN 100525990 C CN100525990 C CN 100525990C CN B2007101823097 A CNB2007101823097 A CN B2007101823097A CN 200710182309 A CN200710182309 A CN 200710182309A CN 100525990 C CN100525990 C CN 100525990C
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quality
weld metal
amount
toughness
intensity
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CN101185996A (en
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石崎圭人
桥本哲哉
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Kobe Steel Ltd
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Kobe Steel Ltd
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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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • B23K35/3066—Fe as the principal constituent with Ni as next major constituent
    • 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
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • 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
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Nonmetallic Welding Materials (AREA)
  • Arc Welding In General (AREA)

Abstract

The invention relates to a flux-cored wire for electrogas welding, in the total quality of wire, including 0.03 to 0.07 quality % of C, 0.3 to 0.8 quality % of Si, 1.5 to 2.2 quality % of Mn, 0.4 to 1.5 quality % of Ni, 0.05 to 0.60 quality % of Cr and Mo, 0.02 to 0.20 quality % of Ti, 0.005 to 0.020 quality % of B, and 0.20 to 0.50 quality % of Mg, wherein, the Al is equal to or less than 0.10%, with 1.0 to 2.0% of slagging agent. The slagging agent, in the total quality of the wire, includes 0.30 to 0.70 quality % of F and 0.02 to 0.20 quality % of K, wherein, the [A]=(Cr+Mo)/Ni is equal to 0.10 to1.0 and [B]=C/(Ti+20*B) is equal to 0.12 to 0.58. With the components, the invention can increase the intensity, extension rate and the flexibility of the welded metal, with more excellent welding operation.

Description

Flux-cored wire and electrogas arc welding metal
Technical field
The present invention relates to carry out upright 1 electrode flux-cored wire and the electrogas arc welding metal of thickness of slab 25mm～70mm to 1 layer of welding bead welding.
Background technology
Electrogas arc welding (electrogas arc welding) as high efficiency vertical position welding method, is used in wide spectrums such as boats and ships, oil storage tank and bridge.In recent years, the economy of all states in Chinese East Asia, the development of industry are swift and violent, along with logistics capacity increases, are purpose for the conveying of the efficient activity that makes container cargo, and the maximization of container ship advances rapidly.
Be accompanied by the maximization of container ship, the wall thickening of side plate and coaming (hatch coaming) etc. advances and the above steel plate of use thickness of slab 50mm.As the construction method that can weld this steel plate expeditiously, to the upswing in demand of 1 layer of welding bead weldingization of high heat energy of utilizing electrogas arc welding.
Become steel plate if so, then speed of welding significantly reduces, and surpasses the situation of 400kJ/cm because of heat energy is also arranged, thus weld metal organize thickization.Therefore, in order to satisfy the intensity and the impact property of regulation, in weld metal, add elements such as Mn, Ni, Mo, improving hardenability, thereby guarantee intensity and impact property as the composition of welding wire.
For example,, can guarantee that also destroying toughness fully is purpose, propose the weld metal of the tissue of regulation even the spy opens the 2005-330578 communique with in the welding above the thick steel products of 50mm in high strength and thickness of slab.In addition, the spy opens the 2005-305498 communique, and to reach at maximum heat energy in the electrogas arc welding weldering about 500kJ/cm, obtaining the very good weld metal of low-temperature flexibility is purpose, and goes out the welding wire that regulation is formed.In addition, the spy opens the 2005-329460 communique, and proposing a kind of characteristic that takes place with the anti-brittle break that improves weld part is the electrogas arc welding method of purpose.
Yet, from welding wire, add alloying elements such as Mn, Ni, Mo if so in a large number, the deflection of the voltage during then owing to welding procedure etc., mother metal dilutes easy change, therefore the chemical composition of weld metal acutely changes, and also confirms the situation of the performance that can't satisfy regulation.
Particularly from the viewpoint of efficiency of construction, demand from the user is, develop the welding wire that can both be suitable at the wide in range thickness range from the thin plate to the slab, the welding wire of corresponding thick steel products, because be to add alloying component to guarantee intensity, so in relative thin plate, its tensile strength becomes too high, be difficult to obtain the percentage elongation in the tension test, confirm that there is not enough situation in its percentage elongation of 22% with respect to the ship's classification specification that is suitable in the shipbuilding field.In addition, toughness also is in the tendency of deterioration.
Up to now, can't say at these problems and carried out sufficient research.Therefore, even present inventors are in order to develop in the thickness of slab of wide in range 25mm～70mm, still have sufficient tensile strength, percentage elongation, good impact property and have the welding wire of excellent weld job and weld metal composition system and experimental study with keen determination, it found that, by the suitable compositing range regulation and the regulation of slag former, can access excellent weld metal characteristic and operation.
Summary of the invention
The present invention forms in view of this problem points, its purpose is, a kind of flux-cored wire and electrogas arc welding metal are provided, this flux-cored wire is at the object steel plate of the wide in range 25mm～70mm of the thickness of slab that faces difficulty in existing technology, can make intensity and the percentage elongation and the toughness raising of weld metal, this outside weld operation is also excellent.
Flux-cored wire of the present invention is in the flux-cored wire that filling flux forms in the steel crust, based on the welding wire gross mass, contains:
C:0.03～0.07 quality %,
Si:0.3～0.8 quality %,
Mn:1.5～2.2 quality %,
Ni:0.4～1.5 quality %,
The total amount of Cr and Mo: 0.05～0.60 quality %,
Ti:0.02～0.20 quality %,
B:0.005～0.020 quality %,
Mg:0.20～0.50 quality %, and regulation:
Al≤0.10 quality %,
Contain slag former: 1.0～2.0 quality %,
This slag former contains based on the welding wire gross mass:
F:0.30～0.70 quality %,
K:0.02～0.20 quality %,
In addition, if [A], [B] are respectively the content according to Cr, Mo, Ni, C, Ti, B, by formula [A]=(Cr+Mo)/Ni and [B]=C/ (value of Ti+20 * B) obtain, then
[A]：0.10～1.0
[B]：0.12～0.58。
Electrogas arc welding metal of the present invention is in the electrogas arc welding metal that is formed by electrogas arc welding, and the gross mass based on weld metal contains:
C:0.035～0.075 quality %,
Si:0.1～0.6 quality %,
Mn:1.1～1.8 quality %,
Ni:0.4～1.5 quality %,
The total amount of Cr and Mo: 0.05～0.60 quality %,
Ti:0.005～0.050 quality %,
B:0.002～0.008 quality %, and regulation:
O≤0.05 quality %,
N≤0.007 quality %,
Al≤0.03 quality %,
P≤0.025 quality %,
S≤0.025 quality %,
Nb≤0.1 quality %,
Surplus is that Fe:90% is above, Cu, V and unavoidable impurities, and,
Be respectively content as if PCM, [A], [B] in addition according to C, Si, Mn, Cu, Ni, Cr, Mo, V, B, by
PCM＝C+(Si/30)+(Mn/20)+(Cu/20)+(Ni/60)+(Cr/20)+(Mo/15)+(V/10)+(5×B)，
[A]＝(Cr+Mo)/Ni，
[B]=C/ (value of the formula decision of Ti+20 * B), then
PCM：0.175～0.220，
[A]：0.10～1.0，
[B]：0.25～1.67。
According to the present invention, the intensity of weld metal is in proper range, and percentage elongation is also high, and impact value is also good in addition and tenacity excellent.In addition, if use welding wire of the present invention, can obtain excellent weld job.
The specific embodiment
Always, the intensity of the weld metal that causes at the increase along with the welding heat energy of wall thickening reduces and the toughness deterioration, mainly is to add Ni to realize improvement to this problem in welding wire.Therefore, when the thickness of slab of welded plate is the such heavy wall of 60mm, also confirm to have the Ni amount of electrogas arc welding metal to reach the above situation of 2 quality %.But thus, if use the many welding wires of Ni content thickness ratio is implemented welding than the welded plate of thin 25mm, then because the heat energy reduction, it is big that hardenability becomes, therefore though be to be in the raising of toughness and to improve on the direction of percentage elongation as heat energy, but, confirm toughness deterioration and the tendency that is difficult to obtain extension owing to the excessive alloying component amount based on Ni causes intensity to become too high.Therefore, present inventors do not make intensity become too high in order to develop when the thickness of slab of welded plate is thin, simultaneously when the thickness of slab of welded plate is thick, even the alloying component amount also can reduce at intensity less effectively and the composition system of toughness deterioration and carried out experimental study with keen determination.It found that the balance of Cr, Mo, Ni amount is very important.
Cr, Mo are bigger than Ni quenching effect.Even therefore a spot of interpolation also can make and organize miniaturization, thereby guarantees the intensity and the toughness of slab effectively.Though the effect that Ni quenches is littler than Cr, Mo, the effect of the transition temperature of reduction impact characteristics is arranged, if very few, the remarkable deterioration of toughness at low temperatures then.Therefore, by suitably managing the balance of Cr, Mo, Ni amount, can reduce the alloying component amount, and can guarantee the intensity and the toughness of slab.In addition, even when the thickness of slab of welded plate is thin, also can not cause intensity to become too high because of excessive alloying component amount, thereby be on the stable direction of percentage elongation and toughness.
So, under the thickness of slab of broad range,,,, do not reach percentage elongation as yet and guarantee fully though be to be on the so-called stable direction about the percentage elongation of added metal although can guarantee intensity and toughness.
Therefore present inventors are further studied, and it found that the balance of C, Ti, B amount has a significant impact percentage elongation.In order to improve the percentage elongation of weld metal, need make the dislocation that exists in the metallic crystal be easy to move.But,, so precipitation particles and solid solution element are many, are fixing dislocation strongly and hinder it to move, so percentage elongation is low because of the alloying component amount in the former weld metal is many.
C in the weld metal be used to guarantee weld metal intensity integral element.As described above, even also can guarantee intensity and toughness for the high heat energy that faces slab,, in order to improve percentage elongation, can adopt the method that reduces the alloying component amount as far as possible in addition even also can not make intensity become too high during thin plate.C compares with Si, Mn, Ni, Cr, Mo, even a small amount of interpolation also can be guaranteed intensity.Therefore, its to improve again on the percentage elongation when guaranteeing intensity be effective composition.On the other hand, Ti, B generate Ti oxide or B nitride etc., and this becomes the nuclei of crystallization, and B spreads at crystal boundary in addition, can suppress just to analyse ferritic separate out etc., have to make the effect of organizing miniaturization, and be effective composition therefore improving on the impact property.But as described above, because Ti, B hinder the effect height that moves of dislocation, so percentage elongation is had adverse effect.Therefore, it is most important to the improvement of percentage elongation suitably to manage the balance of C, Ti, B amount.
Below, add reason and form limiting reason and describe with regard to the composition of welding wire of the present invention.The content here all is the value that accounts for the welding wire gross mass.
" C:0.03～0.07 quality % "
C be used to guarantee weld metal intensity integral element.When the content of C was lower than 0.03 quality %, the intensity of weld metal reduced, and organizes thickization, and toughness is deterioration also.On the other hand, if C content surpasses 0.07 quality %, then the intensity of weld metal becomes too high, the toughness deterioration.Also have,, the C in the steel crust, the C of C monomer, iron powder and metal powder in the solder flux etc. are arranged as the C source.
" Si:0.3～0.8 quality % "
Si makes the oxygen amount Jiang Shi of weld metal as deoxidier and toughness is improved.But, when Si content is lower than 0.3 quality %, the toughness deterioration of weld metal.On the other hand, if above 0.8 quality %, then carrying out deoxidation, Si becomes the SiO of slag 2The amount surplus, the viscosity of slag uprises, so the discharge variation of slag.Therefore, electric arc can't spread, and the mother metal dilution tails off, and intensity uprises, and percentage elongation is low, and toughness is deterioration also.Also have, as the Si source, the Si in the steel crust is arranged, the Fe-Si in the solder flux, Fe-Si-Mn, Fe-Si-Mg, REM-Ca-Si etc.
" Mn:1.5～2.2 quality % "
Mn reduces the oxygen amount of weld metal as deoxidier and toughness is improved, and is guaranteeing that aspect the intensity of weld metal also be effective elements simultaneously.When Mn content is lower than 1.5 quality %, the toughness deterioration of weld metal.On the other hand, if Mn content surpasses 2.2 quality %, then the intensity of weld metal becomes too high and the toughness deterioration.Also have,, Mn, metal M n, Fe-Mn, Fe-Si-Mn etc. in the steel crust are arranged as the Mn source.
" Ni:0.4～1.5 quality % "
Ni is an austenite former, and as described above, it has the effect of the toughness stabilisation that makes weld metal.When Ni content is lower than 0.4 quality %, the toughness deterioration of weld metal.On the other hand, if Ni content surpasses 1.5 quality %, intensity became too high, toughness deterioration, percentage elongation step-down when then thickness of slab was thin.Also have,, metal Ni, Fe-Ni, Ni-Mg etc. are arranged as the Ni source.
" the total amount of Cr and Mo: 0.05～0.60 quality % "
Cr, Mo are ferrite formers, have the effect of the hardenability that improves weld metal, be heat energy surpass 400kJ/cm make in this case the solidified structure miniaturization aspect effective elements.Therefore, Cr, Mo improve toughness, even a spot of in addition interpolation also can improve intensity.The total content of Cr, Mo is lower than 0.05 quality %, thickization of solidified structure and toughness deterioration.On the other hand, if the total content of Cr, Mo surpasses 0.60 quality %, then intensity uprises and the toughness deterioration.Also can not contain the both sides of Cr and Mo, and only contain any one party.Also have, Metal Cr, Fe-Cr etc. are arranged,, metal M o, Fe-Mo etc. are arranged as the Mo source as the Cr source.
" Ti:0.02～0.20 quality % "
Ti makes weld metal organize miniaturization by the synergy with B, has the effect that the toughness of making improves.When Ti content is lower than 0.02 quality %, the micronized effect that can not get organizing, the toughness deterioration of weld metal.On the other hand, if Ti surpasses 0.20 quality %, Ti surplus in weld metal then, beyond the toughness deterioration, percentage elongation is step-down also.Also have,, metal Ti, Fe-Ti etc. are arranged as the Ti source.
" B:0.005～0.020 quality % "
B makes weld metal organize miniaturization with a spot of interpolation by the synergy with Ti, has the effect that the toughness of making improves.When B content is lower than 0.005 quality %, the micronized effect that can not get organizing, the toughness deterioration of weld metal.On the other hand, if B content surpasses 0.020 quality %, B surplus in the weld metal then, it is too high that intensity becomes, and beyond the property deterioration, percentage elongation is step-down also.Also have,, Fe-B, Fe-Si-B, B are arranged as the B source 2O 3Deng.
" Mg:0.20～0.50 quality % "
Mg has the effect that the toughness of making improves as the oxygen amount of deoxidier one low weld metal.When Mg content was lower than 0.20 quality %, the oxygen amount that can not get weld metal reduced effect, the toughness deterioration of weld metal.On the other hand, if Mg content surpasses 0.50 quality %, electric arc instability then, pilosity splashes.Also have,, metal M g, Al-Mg, Fe-Si-Mg, Ni-Mg etc. are arranged as the Mg source.
“[A]＝(Cr+Mo)/Ni：0.10～1.0”
As described above, Cr, Mo are bigger than the effect that Ni quenches.Therefore, organize miniaturization, thereby guarantee the intensity and the toughness of slab effectively even a spot of interpolation of Cr and Mo also can make.Though the effect that Ni quenches is littler than Cr, Mo, has the effect of the transition temperature that reduces impact characteristics, if cross the remarkable deterioration of toughness under the low temperature at least.Therefore, the balance by suitable management Cr, Mo, Ni amount not only can reduce the alloying component amount, and can guarantee the intensity and the toughness of slab.In addition, when thickness of slab is thin, can cause intensity to become too high owing to excessive alloying component amount yet, thereby be in percentage elongation and all stable direction of toughness.If [A] of welding wire is lower than 0.10, then organizes thickization, the toughness deterioration.On the other hand, if welding wire [A] surpasses 1.0, then uprise, so the toughness deterioration owing to transition temperature.
“[B]＝C/(Ti+20×B)：0.12～0.58”
In order to improve the percentage elongation of weld metal, need make the dislocation that exists in the metallic crystal be easy to change.But up to now,,, fixing dislocation strongly and hinder it to move, therefore existing percentage elongation to hang down such problem points so precipitation particles and solid solution element are many because the alloying component amount in the weld metal is many.C in the weld metal be used to guarantee added metal intensity integral element.As described above, even also can guarantee intensity and toughness for the high heat energy that faces slab,, in order to improve percentage elongation, can adopt the method that reduces the alloying component amount as far as possible in addition even also can not make intensity become too high during thin plate.C compares with Si, Mn, Ni, Cr, Mo, even a small amount of interpolation also can be guaranteed intensity.Therefore, to improve again on the percentage elongation when guaranteeing intensity be effective composition to C.On the other hand, Ti, B generate Ti oxide or B nitride etc., and this becomes the nuclei of crystallization, and B spreads at crystal boundary in addition, can suppress just to analyse ferritic separate out etc., have to make the effect of organizing miniaturization, and be effective composition therefore improving on the impact property.But as described above, because Ti, B hinder the effect height that moves of dislocation, so percentage elongation is had adverse effect.If [B] of welding wire is lower than 0.12, then Ti, B amount is many, so the percentage elongation step-down of weld metal.On the other hand, if [B] of welding wire surpasses 0.58, then intensity becomes too high, so the toughness deterioration of weld metal.
" Al≤0.10 quality % "
Al is effective on the oxygen amount that reduces weld metal as deoxidier, if but add, then hinder the generation of Ti oxide. superfluouslyTherefore, can't obtain the micronized effect of the tissue that brings by the Ti oxide, so the addition of Al is below the 0.10 quality %.
" amount of slag former: 1.0～2.0 quality % "
Slag former in the stabilisation of electric arc, reduce splash and prevent burn-off etc. make the weld job stabilisation aspect indispensable.If the amount of slag former is lower than 1.0 quality %, slag quantity not sufficient then, motlten metal is difficult to stay in the groove, causes the easy burn-off of motlten metal.On the other hand, if slag making dosage surpasses 2.0 quality %, then the slag amount is excessive, slag discharge property variation.Therefore, electric arc can't spread, and the mother metal dilution tails off, and intensity uprises, and percentage elongation is low, and toughness is deterioration also.Also have,, SiO is arranged as slag former 2, CaO, Na 2O, Al 2O 3, Li 2O, CaF 2, BaF 2, NaF, SrF 2, AlF 3, MgF 2, LiF, CaCO 3, MgCO 3, BaCO 3, Li 2CO 3, Na 2CO 3, Sr 2CO 3Deng.
" the F amount among the slag former: 0.30～0.70 quality % "
F in the slag former can reduce the viscosity of slag, optimizes the discharge of slag.When the content of F is lower than 0.30 quality %, the discharge variation of slag, electric arc can't spread, and the mother metal dilution tails off, and intensity uprises, and percentage elongation is low, and toughness is deterioration also.On the other hand, if F surpasses 0.70 quality %, then the discharge of slag becomes very good, and motlten metal can not be stayed in the groove, causes the easy burn-off of motlten metal.Also have,, CaF is arranged as the F source 2, BaF 2, NaF, K 2SiF 6, SrF 2, AlF 3, MgF 2, LiF etc.
" the K amount among the slag former: 0.02～0.20 quality % "
The K of slag former has the effect that makes arc stabilityization.Therefore, the change of voltage reduces, and also makes mother metal dilution stabilisation, thereby can access the sort of weld metal of design.But if the content of K is lower than 0.02 quality %, electric arc instability then is because variation in voltage causes the quality badness of weld metal.On the other hand, if the content of K surpasses 0.20 quality %, gas defects takes place in weld metal portion in the remarkable deterioration of then anti-hygroscopicity.Also have, K is arranged as the K source 2O, K 2SiF 6Deng.
" surplus: Fe etc. "
The surplus of flux-cored wire is Fe, B 2O 3O, REM (rare earth element), P, S, other unavoidable impurities of Al, Ca.Also have, among the surplus, Fe contains more than the 90 quality %, and there is the Fe of steel plate crust, iron powder, Fe alloy etc. in this Fe source.In addition, the solder flux filling rate of flux-cored wire of the present invention is 20～30 quality %.
Next, the composition qualification reason with regard to weld metal describes.The content here all is the value that accounts for the weld metal gross mass.
" C:0.035～0.075 quality % "
C be used to guarantee weld metal intensity integral element.When the content of C was lower than 0.035 quality %, the intensity of weld metal reduced.If C organizes thickization at least, toughness is deterioration also in addition.On the other hand, if C content surpasses 0.075 quality %, then the intensity of weld metal becomes too high, the toughness deterioration.
" Si:0.1～0.6 quality % "
Si makes the oxygen amount Jiang Shi of weld metal as deoxidier and toughness is improved.When Si content is lower than 0.1 quality %, the toughness deterioration of weld metal.On the other hand, if Si content surpasses 0.6 quality %, then intensity uprises, and percentage elongation is low, and toughness is deterioration also.
" Mn:1.1～1.8 quality % "
Mn reduces the oxygen amount of weld metal as deoxidier and toughness is improved, and is guaranteeing that aspect the intensity of weld metal also be effective elements simultaneously.When Mn content is lower than 1.1 quality %, the toughness deterioration of weld metal.On the other hand, if Mn content surpasses 1.8 quality %, then the intensity of weld metal becomes too high, toughness deterioration, percentage elongation step-down.
" Ni:0.4～1.5 quality % "
Ni is an austenite former, and as described above, it has the effect of the toughness stabilisation that makes weld metal.When Ni content is lower than 0.4 quality %, the toughness deterioration of weld metal.On the other hand, if Ni content surpasses 1.5 quality %, intensity became too high, toughness deterioration, percentage elongation step-down when then thickness of slab was thin.
" the total amount of Cr and Mo: 0.05～0.60 quality % "
Cr, Mo are ferrite formers, have the effect of the hardenability that improves weld metal, are to make effective elements aspect the solidified structure miniaturization in this case what heat energy surpassed 400kJ/cm.Therefore, the interpolation of Cr and/or Mo improves the toughness of weld metal, even a spot of in addition interpolation also can improve intensity.The total content of Cr and Mo is lower than 0.05 quality %, thickization of solidified structure and toughness deterioration.On the other hand, if the total content of Cr and Mo surpasses 0.60 quality %, then uprise except intensity, beyond the toughness deterioration, percentage elongation is step-down also.Also have, also can not contain the both sides of Cr and Mo, and only contain any one party.
" Ti:0.005～0.050 quality % "
Ti makes weld metal organize miniaturization by the synergy with B, has the effect that the toughness of making improves.When Ti content is lower than 0.005 quality %, the micronized effect that can not get organizing, the toughness deterioration of weld metal.On the other hand, if Ti surpasses 0.050 quality %, Ti surplus in weld metal then, beyond the toughness deterioration, percentage elongation is step-down also.
" B:0.002～0.008 quality % "
B makes weld metal organize miniaturization with a spot of interpolation by the synergy with Ti, has the effect that the toughness of making improves.When B content is lower than 0.002 quality %, the micronized effect that can not get organizing, the toughness deterioration of weld metal.On the other hand, if B content surpasses 0.008 quality %, B surplus in the weld metal then, it is too high that intensity becomes, and beyond the property deterioration, percentage elongation is step-down also.
“PCM＝C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5×B：0.175～0.220”
Measure though define C, Si, Mn, Ni, Cr, Mo, Ti, the B of weld metal according to aforesaid reason,, also will consider to contain the situation of Cu, V, Nb according to the mother metal that is suitable for.Because electric vertical position welding metal also can be subjected to the influence of mother metal, so high if Cu, V, the Nb of mother metal measure, then the intensity of weld metal becomes too high, toughness deterioration, percentage elongation step-down.The intensity of formula PCM and weld metal has close dependency relation, in this is bright, is defined in prescribed limit by the scope with the value of PCM, can design the weld metal composition of having considered the mother metal that is suitable for.PCM is lower than at 0.175 o'clock, surpasses under the such situation of 400kJ/cm undercapacity at heat energy.On the other hand, when PCM surpassed 0.220, it is too high that intensity becomes, toughness deterioration, percentage elongation step-down.
“[A]＝(Cr+Mo)/Ni：0.10～1.0”
As described above, Cr, Mo are bigger than the effect that Ni quenches.Therefore, organize miniaturization, thereby guarantee the intensity and the toughness of slab effectively even a spot of interpolation of Cr and Mo also can make.Though the effect that Ni quenches is littler than Cr, Mo, has the effect of the transition temperature that reduces impact characteristics, if cross the remarkable deterioration of toughness under the low temperature at least.Therefore, the balance by suitable management Cr, Mo, Ni amount not only can reduce the alloying component amount, and can guarantee the intensity and the toughness of slab.In addition, even when thickness of slab is thin, can cause intensity to become too high owing to excessive alloying component amount yet, thereby be in percentage elongation and all stable direction of toughness.If [A] is lower than 0.10, then organize thickization, the toughness deterioration.On the other hand, if [A] surpasses 1.0, then uprise, so the toughness deterioration owing to transition temperature.
“[B]＝C/(Ti+20×B)：0.25～1.67”
In order to improve the percentage elongation of weld metal, need make the dislocation that exists in the metallic crystal be easy to change.But former, because the alloying component amount in the weld metal is many,, is fixing dislocation strongly and hinder it to move so precipitation particles and solid solution element are many, therefore exist percentage elongation to hang down such problem points.C in the weld metal be used to guarantee added metal intensity integral element.As described above, even still guarantee intensity and toughness for the high heat energy that faces slab,, in order to improve percentage elongation, can adopt the method that reduces the alloying component amount as far as possible in addition even also can not make intensity become too high during thin plate.C compares with Si, Mn, Ni, Cr, Mo, even a small amount of interpolation also can be guaranteed intensity.Therefore, to improve again on the percentage elongation when guaranteeing intensity be effective composition to C.On the other hand, Ti, B generate Ti oxide or B nitride etc., and this becomes the nuclei of crystallization, and B spreads at crystal boundary in addition, can suppress just to analyse ferritic separate out etc., have to make the effect of organizing miniaturization, and be effective composition therefore improving on the impact property.But as described above, because Ti, B hinder the effect height that moves of dislocation, so percentage elongation is had adverse effect.If [B] is lower than 0.25, then Ti, B amount is many, so the percentage elongation step-down.On the other hand, if [B] surpasses 1.67, then intensity becomes too high, so the toughness deterioration.
" O≤0.05 quality % "
If the O of weld metal amount is high, then toughness deterioration, so O is defined in below the 0.05 quality %.
" N≤0.007 quality % "
If the N of added metal amount is high, then toughness deterioration, so N is defined in below the 0.007 quality %.
" Al≤0.03 quality % "
If the Al of weld metal amount is high, the micronized effect of organizing that then the Ti oxide brings is suppressed, the toughness deterioration, so Al is defined in below the 0.03 quality %.
" P≤0.025 quality % "
If the P of weld metal amount is high, heat cracking then takes place easily, so P is defined in below the 0.025 quality %.
" S≤0.025 quality % "
If the S of weld metal amount is high, heat cracking then takes place easily, so S is defined as below the 0.025 quality %.
" Nb≤0.1 quality % "
If the Nb of weld metal amount is high, heat cracking then takes place easily, so Nb is defined in below the 0.1 quality %.
" surplus is Fe and unavoidable impurities "
The surplus of weld metal is that Fe reaches Cu, the V that sneaks into owing to the dilution of mother metal, also has unavoidable impurities in addition.Also have, Fe accounts for more than the 90 quality % among the surplus.Cu is involved as impurity in the flux-cored wire filling flux and in the steel crust, and when being seamless welding wire in addition, it is included among the plating Cu of welding wire surface.In addition, also have the Cu that contains in the mother metal diluted and enter in the weld metal.In this case, if Cu surpasses 0.5 quality %, then intensity excessively improves and the toughness deterioration, and percentage elongation also reduces.For V, it also is comprised in the filling flux of flux-cored wire as impurity and in the steel crust, the V that contains in mother metal is included in the weld metal by dilution, but its amount is allowed to reach 0.5 quality %, be worth then intensity surplus if surpass this, toughness reduces, and percentage elongation reduces.
[embodiment]
Next, the result of the test of carrying out with regard to being used to confirm effect of the present invention describes.Following table 1 shows the composition for the examination steel plate.This confession examination steel plate yield strength is 390N/mm 2More than, have the size of thickness of slab 25～70mm, wide 500mm, long 1000mm.Following table 2 shows experimental condition, and following table 3 shows the welding procedure condition.Line directly is 1.6mm, carries out 1 layer of welding bead welding with the condition shown in table 2 and the table 3.
In welding, confirm operation.Carry out UT after the welding and check, confirm to have zero defect.Also having, serves as to check object with each 100mm that welds unsettled starting point side and weld bond (crater) side.Therefore effective length is 800mm.Also have, can shorten because of burn-off in the way.From thickness of slab, then extract the tension test sheet of weld metal, be of a size of diameter 10mm, punctuate spacing 50mm, the result of tension test is that tensile strength is 510～690N/mm 2Above being judged as obtained suitable intensity.Percentage elongation be measure the preceding of tension test and after the punctuate spacing, try to achieve their rate of change.In percentage elongation more than 22% is qualified.About impact test, be method according to JIS Z 3128 defineds, the impact value under measuring-20 ℃, this value for 41J above to be judged as impact property good.
Following table 4 shows the composition of the welding wire of the embodiment of the invention and comparative example.For the welding wire of No.1～No.70, make it to carry out various combinations, the promoting the circulation of qi electric welding of going forward side by side with the examination steel plate that supplies shown in the table 1.Following table 5-1,2,4,5 shows the composition of welding object mother metals (the confession examination steel plate of table 1) and weld metal.In addition, following table 5-3,6 shows the performance of the machinery of weld metal.
In embodiments of the invention No.1～No.32, the intensity of weld metal is in proper range, and percentage elongation also is more than 22%.In addition, impact value is also good, and weld job do not have the problem in the practicality yet, is good.
With respect to this, in comparative example No.33, welding wire C amount is lower than 0.03 quality %, and the C amount of weld metal is lower than 0.035 quality %, and beyond the undercapacity, toughness is deterioration also.On the other hand, in comparative example No.34, welding wire C amount surpasses 0.07 quality %, and weld metal C amount surpasses 0.075 quality %, and the intensity of weld metal becomes too high, the toughness deterioration.In comparative example No.35, welding wire Si amount is lower than 0.3 quality %, and weld metal Si amount is lower than 0.1 quality %, toughness deterioration.On the other hand, in comparative example No.36, welding wire Si amount surpasses 0.8 quality %, and weld metal Si amount surpasses 0.6 quality %, becomes the SiO of slag 2Amount is superfluous, so the discharge variation of slag and intensity becomes too high, percentage elongation and toughness deterioration.
In comparative example No.37, welding wire Mn amount is lower than 1.5 quality %, and weld metal Mn amount is lower than 1.1 quality %, toughness deterioration.On the other hand, in comparative example No.38, welding wire Mn amount surpasses 2.2 quality %, and weld metal Mn amount surpasses 1.8 quality %, and the intensity of weld metal becomes too high, percentage elongation and toughness deterioration.In comparative example No.39, welding wire Ni amount is lower than 0.4 quality %, and weld metal Ni amount is lower than 0.4 quality %, toughness deterioration.On the other hand, in comparative example No.40, bonding wire Ni amount surpasses 1.5 quality %, and weld metal Ni amount surpasses 1.5 quality %, and it is too high that intensity becomes, percentage elongation and toughness deterioration.
In comparative example No.41 and No.42, welding wire Cr+Mo amount is lower than 0.05 quality %, and weld metal Cr+Mo amount is lower than 0.05 quality %, toughness deterioration.On the other hand, in comparative example No.43 and among the No.44, welding wire Cr+Mo amount surpasses 0.60 quality %, and weld metal Cr+Mo amount surpasses 0.60 quality %, and the intensity of weld metal became strong, percentage elongation and toughness deterioration.In comparative example No.45, welding wire Ti amount is lower than 0.02 quality %, and weld metal Ti amount is lower than 0.005 quality %, toughness deterioration.On the other hand, in comparative example No.46, welding wire Ti amount surpasses 0.20 quality %, and weld metal Ti amount surpasses 0.050 quality %, percentage elongation and toughness deterioration.
In comparative example No.47, welding wire Al amount surpasses 0.10 quality %, and weld metal Al amount surpasses 0.03 quality %, toughness deterioration.In comparative example No.48, welding wire B amount is lower than 0.005 quality %, and weld metal B amount is lower than 0.002 quality %, toughness deterioration.On the other hand, in comparative example No.49, welding wire B amount surpasses 0.020 quality %, and weld metal B amount surpasses 0.008 quality %, and weld metal intensity becomes too high, percentage elongation and toughness deterioration.In comparative example No.50, welding wire Mg amount is lower than 0.20 quality %, and weld metal O amount surpasses 0.005 quality %, toughness deterioration.
On the other hand, in comparative example No.51, welding wire Mg amount surpasses 0.50 quality %, the electric arc instability, and pilosity splashes.In comparative example No.52, weld metal PCM is lower than 0.175, undercapacity.On the other hand, in comparative example No.53, weld metal PCM surpasses 0.220, and it is too high that intensity becomes, percentage elongation and toughness deterioration.Comparative example No.54,55,56 its welding wires and weld metal [A] are lower than 0.10, the toughness deterioration.Comparative example No.57,58 its welding wires and weld metal [A] surpass 1.0, the toughness deterioration.Comparative example No.59,60 its welding wires [B] are lower than 0.12, and weld metal [B] is lower than 0.25, the percentage elongation deterioration.Comparative example No.61, weld metal N amount surpasses 0.007 quality %, toughness deterioration.Comparative example No.62 weld metal S amount surpasses 0.025 quality %, and heat cracking takes place.Comparative example No.63 weld metal P amount surpasses 0.025 quality %, and heat cracking takes place.Comparative example No.64 weld metal Nb amount surpasses 0.1 quality %, and heat cracking takes place.In comparative example No.65, the amount of slag former is lower than 1.0 quality %, in the way burn-off has taken place.
On the other hand, in comparative example No.66, the amount of slag former surpasses 2.0 quality %, and the intensity of weld metal becomes too high, percentage elongation and toughness deterioration.In comparative example No.67, welding wire F amount is lower than 0.30 quality %, and the intensity of weld metal becomes too high, percentage elongation and toughness deterioration.On the other hand, in comparative example No.68, welding wire F amount surpasses 0.70 quality %, in the way burn-off has taken place.In comparative example No.69, welding wire K amount is lower than 0.02 quality %, spread of voltage, and consequently the mother metal dilution tails off, and weld metal intensity becomes too high, percentage elongation and toughness deterioration.On the other hand, in comparative example No.70, welding wire K amount surpasses 0.20 quality %, and gas defects takes place in the weld metal anti-hygroscopicity deterioration.
Table 1
Figure C200710182309D00171
Table 2
Welding method Upright to automatic single electrode single pass welding welding
Welder Upright to automatic single electrode single pass welding welder
The substrate material Gu shape fire proofed wood
Welding wire is given prominence to length 30～35mm
Protective gas 100%CO2,40L/ minute
Table 3
Thickness of slab (mm) Bevel angle Gap (mm) Welding current (A) Arc voltage (V) Speed of welding (cm/ branch) Input heat (kJ/cm)
25 35 * 6 360～380 41～43 7.0～7.2 128～135
40 25 * 6 370～390 42～44 4.4～4.6 210～220
60 20 * 8 380～400 42～44 2.5～2.7 370～407
70 20 * 8 390～410 42～44 2.0～2.2 462～526
Table 4-1
No. C Si Mn P S Ni Cr Mo Ti Al
1 0.05 0.6 1.8 0.015 0.010 0.9 0 0.11 0.11 0.04
2 0.03 0.5 1.9 0.017 0.010 1.0 0.01 0.24 0.03 0.05
3 0.07 0.5 1.8 0.017 0.010 1.2 0.01 0.15 0.09 0.04
4 0.04 0.3 1.8 0.012 0.009 1.2 0.10 0.13 0.09 0.04
5 0.06 0.8 1.6 0.015 0.008 0.8 0.01 0.21 0.08 0.05
6 0.06 0.5 1.5 0.015 0.008 0.7 0.20 0.02 0.08 0.05
7 0.05 0.6 2.2 0.013 0.010 1.0 0.30 0 0.11 0.06
8 0.05 0.5 1.9 0.011 0.008 0.4 0 0.30 0.02 0.06
9 0.06 0.6 1.8 0.013 0.008 1.5 0.15 0.20 0.09 0.07
10 0.06 0.6 1.8 0.015 0.010 0.4 0.03 0.02 0.11 0.04
11 0.06 0.5 1.8 0.011 0.008 0.5 0.05 0 0.03 0.04
12 0.06 0.5 1.6 0.013 0.009 0.7 0.48 0.12 0.09 0.05
13 0.06 0.6 1.8 0.012 0.008 0.8 0.15 0.44 0.08 0.05
14 0.05 0.4 1.8 0.014 0.010 0.8 0 0.60 0.08 0.04
15 0.06 0.5 1.8 0.013 0.008 0.9 0.20 0.02 0.19 0.05
16 0.06 0.6 1.6 0.014 0.009 0.9 0.05 0.20 0.16 0.09
17 0.06 0.6 1.9 0.012 0.008 0.6 0 0.06 0.09 0.07
18 0.05 0.5 1.7 0.015 0.013 0.8 0 0.15 0.09 0.05
19 0.06 0.6 1.7 0.013 0.012 0.7 0.05 0.11 0.08 0.04
20 0.05 0.4 1.8 0.013 0.010 0.4 0.30 0.10 0.09 0.04
21 0.07 0.6 1.9 0.014 0.008 0.8 0.05 0.16 0.20 0.06
22 0.04 0.5 1.7 0.012 0.012 0.7 0 0.15 0.14 0.05
23 0.07 0.3 1.5 0.014 0.009 0.6 0 0.13 0.02 0.05
24 0.07 0.3 1.8 0.011 0.010 0.5 0.10 0 0.02 0.04
25 0.07 0.6 1.8 0.012 0.009 0.8 0.03 0.15 0.08 0.04
26 0.06 0.7 1.9 0.035 0.008 1.0 0 0.17 0.08 0.05
27 0.06 0.5 1.7 0.012 0.009 0.8 0.10 0.17 0.10 0.05
28 0.05 0.6 1.8 0.014 0.010 0.8 0.01 0.13 0.08 0.04
29 0.06 0.5 1.7 0.012 0.010 0.7 0.01 0.13 0.09 0.04
30 0.06 0.6 1.9 0.014 0.009 0.8 0.03 0.15 0.14 0.05
31 0.06 0.5 1.7 0.012 0.035 0.5 0.40 0.10 0.16 0.05
32 0.07 0.6 1.7 0.039 0.009 0.7 0.03 0.04 0.15 0.05
Table 4-2
Figure C200710182309D00191
Table 4-3
No. C Si Mn P S Ni Cr Mo Ti Al
33 0.02 0.7 1.7 0.014 0.010 1.0 0.05 0.35 0.04 0.05
34 0.08 0.6 1.7 0.013 0.009 0.6 0.03 0.17 0.05 0.06
35 0.05 0.2 1.8 0.014 0.009 0.6 0.30 0.13 0.13 0.04
36 0.07 0.9 1.7 0.014 0.010 0.8 0 0.18 0.08 0.04
37 0.06 0.5 1.4 0.015 0.008 0.7 0.20 0.02 0.08 0.05
38 0.06 0.4 2.3 0.013 0.009 0.4 0.40 0.10 0.08 0.06
39 0.06 0.4 1.8 0.015 0.011 0.3 0.10 0.20 0.11 0.05
40 0.06 0.5 1.9 0.015 0.010 1.6 0.13 0.30 0.07 0.08
41 0.06 0.7 1.7 0.013 0.010 0.4 0.02 0.02 0.09 0.05
42 0.05 0.6 1.8 0.015 0.010 0.4 0 0.04 0.04 0.05
43 0.06 0.5 1.7 0.015 0.010 1.1 0.34 0.30 0.11 0.05
44 0.08 0.6 1.7 0.014 0.009 1.2 0.62 0 0.05 0.04
45 0.06 0.4 1.8 0.017 0.009 1.0 0.10 0.05 0.01 0.06
46 0.05 0.4 1.7 0.012 0.012 1.0 0 0.20 0.21 0.05
47 0.06 0.5 1.7 0.015 0.010 0.7 0.08 0.05 0.13 0.11
48 0.05 0.4 1.8 0.011 0.011 0.9 0.10 D.15 0.10 0.06
49 0.06 0.5 1.8 0.014 0.00 0.8 0 0.1 0.07 0.06
50 0.05 0.5 1.8 0.014 0.011 0.8 0.02 0.10 0.12 0.04
51 0.06 0.5 1.7 0.010 0.012 0.9 0.03 0.09 0.08 0.05
52 0.05 0.3 1.5 0.009 0.012 0.7 0.04 0.08 0.09 0.04
53 0.07 0.6 1.7 0.008 0.012 1.1 0.03 0.30 0.11 0.05
54 0.05 0. 1.8 0.011 0.008 0.7 0.05 0.01 0.08 0.05
55 0.05 0.5 1.8 0.012 0.010 1.1 0.03 0.07 0.07 0.06
58 0.06 0.5 1.8 0.013 0.010 1.5 0.05 0.9 0.06 0.04
57 0.06 0.4 1.7 0.014 0.00 0.4 0.34 0.11 0.11 0.05
58 0.05 0.5 1.0 0.012 0.009 0.5 0.29 0.30 0.08 0.05
59 0.04 0.4 1.0 0.011 0.010 0.8 0.05 0.14 0.15 0.06
60 0.06 0.5 1. .013 0.008 0.9 0 0.11 0.20 0.05
61 0.05 0.05 1.7 0.015 0.010 0.9 0 0.10 0.09 0.04
62 0.60 0.6 1.8 0.015 0.037 0.7 0 0.10 0.08 0.04
63 0.05 0.5 1.9 0.02 0.010 0.8 0.05 0.20 0.07 0.05
64 0.05 0.5 1.7 0.015 0.010 0、8 0.05 0.15 0.11 0.04
65 0.05 0.5 1.7 0.013 0.008 0.5 0.01 0.05 0.08 0.06
66 0.07 0.5 1.7 0.017 0.033 0. 0.01 0.30 0.09 0.06
67 0.06 0.8 1.7 0.013 0.010 0.7 04 0.15 0.08 0.05
68 0.08 0.4 1.7 0.017 0.008 1.0 0.20 0 0.09 0.07
69 0.07 0.6 1. 0.013 0.009 .2 0.20 0.17 0.11 0.06
70 0.06 0.5 1.7 0.013 0.008 0.6 0.10 0.05 0.15 0.04
Table 4-4
Table 5-1
No. Mother metal C Si Mn P S Cu Ni Cr
1 D 0.052 0.37 1.58 0.010 0.007 0 0.77 0
2 D 0.036 0.31 1.66 0.011 0.007 0 0.85 0.01
3 D 0.073 0.31 1.58 0.011 0.007 0 1.13 0.01
4 D 0.043 0.13 1.50 0.008 0.006 0 1.01 0.09
5 D 0.061 0.58 1.40 0.010 0.006 0 0.68 0.01
6 A 0.056 0.31 1.14 0.010 0.006 0.06 0.63 0.15
7 D 0.053 0.35 1.78 0.008 0.007 0 0.85 0.26
8 D 0.051 0.31 1.66 0.007 0.006 0 0.41 0
9 A 0.053 0.38 1.52 0.009 0.006 0.06 1.48 0.14
10 D 0.061 0.37 1.60 0.010 0.007 0 0.35 0.03
11 D 0.061 0.31 1.58 0.007 0.006 0 0.41 0.05
12 D 0.061 0.32 1.43 0.008 0.006 0 0.60 0.48
13 D 0.058 0.37 1.60 0.008 0.006 0 0.64 0.15
14 D 0.052 0.25 1.56 0.009 0.007 0 0.59 0
15 B 0.053 0.30 1.60 0.009 0.006 0.08 0.91 0.20
16 A 0.056 0.38 1.36 0.009 0.006 0.06 0.84 0.05
17 A 0.053 0.37 1.60 0.008 0.006 0.007 0.75 0.01
18 B 0.047 0.29 1.53 0.010 0.009 0.08 0.82 0.03
19 B 0.051 0.36 1.52 0.009 0.009 0.08 0.74 0.07
20 A 0.048 0.25 1.53 0.009 0.007 0.06 0.39 0.27
21 B 0.051 0.36 1.69 0.010 0.006 0.08 0.83 0.07
22 B 0.037 0.29 1.52 0.008 0.009 0.08 0.75 0.03
23 B 0.061 0.18 1.37 0.010 0.007 0.08 0.96 0.04
24 C 0.075 0.18 1.55 0.007 0.007 0 0.43 0.09
25 C 0.071 0.36 1.53 0.008 0.006 0 0.68 0.03
26 C 0.065 0.42 1.58 0.021 0.006 0 0.85 0
27 D 0.061 0.31 1.56 0.008 0.006 0 0.68 0.09
28 D 0.052 0.38 1.58 0.009 0.007 0 0.68 0.01
29 A 0.056 0.32 1.44 0.00 0.007 0.06 0.67 0.02
30 A 0.054 0.3 1.61 0.009 0.006 0.06 0.76 0.03
31 B 0.055 0.28 1.51 0.006 0.024 0.06 0.57 0.37
32 B 0.060 0.36 1.55 0.024 0.007 0.08 0.91 0.05
Table 5-2
No. Mo Ti V Al B Nb O N PCM
1 0.09 0.029 0 0.012 0.0062 0.002 0.03 0.004 0.194
2 0.21 0.008 0 0.014 0.0046 0.002 0.03 0.007 0.181
3 0.13 0.024 0 0.012 0.0034 0.002 0.03 0.004 0.208
4 0.11 0.024 0 0.012 0.0057 0.002 0.04 0.004 0.179
5 0.18 0.021 0 0.014 0.0051 0.002 0.03 0.004 0.199
6 0.04 0.021 0.001 0.012 0.0069 0.003 0.04 0.004 0.181
7 0 0.028 0 0.017 0.0057 0.002 0.03 0.004 0.209
8 0.24 0.006 0 0.017 0.0055 0.002 0.03 0.005 0.195
9 0.17 0.023 0.001 0.0018 0.0044 0.098 0.03 0.004 0.210
10 0.02 0.031 0 0.012 0.0056 0.002 0.03 0.005 0.189
11 0 0.009 0 0.012 0.0058 0.002 0.03 0.004 0.188
12 0.10 0.024 0 0.014 0.0036 0.002 0.04 0.004 0.202
3 0.42 0.025 0 0.013 0.0034 0.002 0.0 0.005 0.214
14 0.58 0.023 0 0.012 0.0038 0.002 0.03 0.004 0.207
15 0.04 0.049 0 0.014 0.0021 0.008 0.04 0.006 0.185
6 0.17 0.041 0.001 0.028 0.0069 0.003 0.03 0.005 0.202
17 0.07 0.023 0.001 0.019 0.0078 0.003 0.03 0.005 0.205
18 0.15 0.024 0 0.014 0.0056 0.008 0.05 0.004 0.190
19 0.11 0.021 0 0.011 0.0051 0.012 0.03 0.004 0.192
20 0.11 0.025 0.001 0.013 0.0040 0.003 0.04 0.004 0.183
21 0.16 0.048 0 0.016 0.0078 0.008 0.03 0.006 0.218
22 0.15 0.037 0 0.014 0.0052 0.008 0.03 0.005 0.176
23 0.13 0.005 0 0.015 0.0021 0.011 0.03 0.005 0.177
24 0.02 0.005 0.002 0.011 0.0020 0.093 0.04 0.005 0.182
25 0.15 0.022 0.002 0.011 0.0039 0 0.03 0.005 0.202
26 0.17 0.022 0.002 0.014 0.0033 0 0.03 0.004 0.200
27 0.15 0.026 0 0.014 0.0057 0.002 0.04 0.004 0.203
28 0.11 0.021 0 0.012 0.057 0.002 0.03 0.004 0.192
29 0.11 0.023 0.001 0.012 0.0067 0.003 0.03 0.004 0.194
30 0.13 0.037 0.01 0.014 0.0056 0.03 0.03 0.005 0.201
31 0.1 0.0 0 0.014 0.0040 0.00 0.03 0.04 0.199
32 0.05 0.039 0 0.014 0.0039 0.008 0.04 0.005 0.193
Table 5-3
No. [A]＝(Cr+ Mo)/Ni [B]＝C/(T i+20×B) Tensile strength (MPa) Percentage elongation (%) Impact value-20 ℃ (J) Reference
1 0.13 0.34 590 26 121
2 0.25 0.37 535 27 133
3 0.13 0.79 643 23 87
4 0.20 0.31 528 26 66
5 0.28 0.49 637 24 103
6 0.30 0.35 536 26 61
7 0.30 0.38 648 23 105
8 0.59 0.44 590 24 95
9 0.21 0.48 643 23 78
10 0.13 0.42 567 26 63
11 0.11 0.48 565 25 51
12 0.98 0.63 615 25 53
13 0.89 0.62 667 23 58
14 0.99 0.53 635 24 66
15 0.26 0.58 550 22 49
16 0.26 0.31 615 25 48
17 0.10 0.30 632 22 45
18 0.22 0.34 671 24 78
19 0.25 0.42 577 25 85
20 0.97 0.45 542 25 76
21 0.27 0.25 683 22 46
22 0.24 0.26 515 23 44
23 0.18 1.29 515 26 103
24 0.25 1.67 535 26 71
25 0.26 0.72 618 25 124
26 0.20 0.74 625 26 114
27 0.34 0.44 641 24 91
28 0.18 0.39 579 25 87
29 0.10 0.35 587 25 115
30 0.21 0.36 615 23 43
31 0.06 0.45 604 23 46
32 0.10 0.1 602 25 43
Table 5-4
No. Mother metal C Si Mn P S Cu Ni Cr
33 D 0.032 0.43 1.51 0.009 0.007 0 0.85 0.05
34 D 0.077 0.37 1.51 0.008 0.006 0 0.51 0.03
35 D 0.052 0.09 1.56 0.009 0.006 0 0.43 0.26
36 D 0.069 0.61 1.51 0.009 0.007 0 0.68 0
37 A 0.058 0.32 1.09 0.010 0.006 0.06 0.67 0.18
38 D 0.061 0.25 1.82 0.008 0.006 0 0.68 0.34
39 D 0.063 0.28 1.68 0.011 0.008 0 0.38 0.09
40 A 0.054 0.32 1.59 0.010 0.007 0.05 1.52 0.12
41 D 0.060 0.43 1.51 0.008 0.007 0 0.34 0.02
42 D 0.053 0.38 1.59 0.010 0.007 0 0.34 0
43 D 0.063 0.32 1.51 0.010 0.007 0 0.94 0.32
44 D 0.051 0.36 1.49 0.009 0.008 0 1.03 0.61
45 D 0.062 0.26 1.58 0.011 0.006 0 0.85 0.09
46 B 0.045 0.24 1.53 0.008 0.009 0.08 0.99 0.03
47 A 0.056 0.32 1.44 0.010 0.007 0.005 0.67 0.08
48 A 0.050 0.28 1.55 0.007 0.008 0.06 0.84 0.09
49 A 0.058 0.31 1.53 0.009 0.006 0.06 0.60 0.01
50 B 0.046 0.33 1.61 0.010 0.005 0.07 0.92 0.06
51 B 0.054 0.28 1.55 0.007 0.009 0.60 0.89 0.06
52 D 0.055 0.20 1.42 0.006 0.008 0 0.59 0.04
63 D 0.069 0.38 1.52 0.005 0.08 0 0.95 0.03
54 D 0.059 0.37 1.58 0.007 0.006 0 0.60 0.05
55 D 0.049 0.33 1.57 0.006 0.007 0 0.97 0.03
56 D 0.058 0.34 1.58 0.008 0.007 0 1.34 0.04
57 A 0.053 0.28 1.42 0.009 0.006 0.06 0.3 0.31
58 A 0.051 0.33 1.51 0.008 0.006 0.06 0.50 0.24
59 B 0.035 0.25 1.58 0.008 0.007 0.0 0.61 0.07
50 B 0.050 0.30 1.58 0.005 0.005 0.08 0.90 0.03
61 C 0.057 0.36 1.45 0.010 0.007 0 0.77 0
62 C 0.066 0.36 1.53 0.010 0.026 0 0.60 0
63 C 0.057 0.30 1.61 0.026 0.007 0 0.51 0.04
64 B 0.64 0.30 1.53 0.010 0.007 0.08 0.82 0.07
65 C 0.05 0.30 1.45 0.009 0.006 0 0.43 0.01
66 C 0.074 0.30 1.45 0.011 0.022 0 0.77 0.01
67 D 0.064 0.40 1.56 0.008 0.007 0 0.63 0
68 D 0.062 0.25 1.53 0.011 0.006 0 0.86 0.17
69 A 0.064 0.38 1.59 0.009 0.006 0.06 1.10 0.10
70 A 0.058 0.29 1.45 0.009 0.006 0.06 0.59 0.09
Table 5-5
No. Mo T1 V Al B Nb O N PCM
33 0.30 0.011 0 0.014 0.0040 0.002 0.03 0.005 0.178
34 0.15 0.013 0 0.017 0.0068 0.002 0.03 0.004 0.218
35 0.11 0.034 0 0.012 0.0057 0.002 0.05 0.004 0.189
36 0.15 0.025 0 0.012 0.0046 0.002 0.03 0.004 0.209
37 0.02 0.023 0.001 0.014 0.0072 0.003 0.05 0.005 0.184
38 0.09 0.021 0 0.016 0.0051 0.002 0.03 0.005 0.220
39 0.15 0.028 0 0.014 0.0052 0.002 0.03 0.004 0.198
40 0.26 0.018 0.001 0.017 0.0069 0.003 0.03 0.004 0.216
41 0.02 0.024 0 0.014 0.0050 0.002 0.03 0.004 0.163
42 0.04 0.013 0 0.013 0.0049 0.02 0.03 0.004 0.178
43 0.30 0.030 0 0.016 0.0034 0.002 0.04 0.004 0.218
44 0 0.011 0 0.011 0.0040 0.002 0.03 0.005 0.215
45 0.04 0.003 0 0.017 0.0046 0.002 0.05 0.004 0.194
46 0.19 0.054 0 0.014 0.0024 0.008 0.04 0.006 0.166
47 0.04 0.033 0.001 0.031 0.0067 0.003 0.03 0.005 0.162
48 0.13 0.026 0.001 0.017 0.0019 0.003 0.03 0.005 0.177
49 0.14 0.018 0.001 0.017 0.0083 0.003 0.03 0.005 0.209
50 0.08 0.032 0 0.011 0.0045 0.006 0.06 0.004 0.188
51 0.10 0.021 0 0.014 0.0050 0.008 0.03 0.007 0.194
52 0.07 0.024 0 0.012 0.0050 0.002 0.03 0.004 0.174
53 0.27 0.029 0 0.014 0.0058 0.002 0.03 0.005 0.222
64 0.01 0.021 0 0.014 0.0048 0.002 0.04 0.005 0.186
55 0.06 0.018 0 0.017 0.0058 0.002 0.04 0.004 0.189
56 0.08 0.016 0 0.013 0.0050 0.002 0.04 0.004 0.203
57 0.10 0.023 0.001 0.014 0.0047 0.003 0.03 0.086 0.188
68 0.27 0.024 0.001 0.014 0.0053 0.003 0.03 0.005 0.210
59 0.15 0.030 0 0.016 0.054 0.008 0.03 0.005 0.182
60 0.12 0.049 0 0.010 0.0079 0.008 0.03 0.004 0.207
61 0.11 0.024 0.002 0.011 0.001 0 0.04 0.008 0.193
62 0.11 0.022 0.002 0.011 0.0044 0 0.03 0.004 0.194
63 0.19 0.019 0.002 0.014 0.0055 0 0.03 0.005 0.10
64 0.15 0.029 0 0.61 0.0045 0.11 0.03 0.005 0.185
65 0.07 0.022 0.002 0.010 0.0055 0 0.03 0.00 0.17B
66 0.28 0.024. 0.002 0.018 0.0050 0 0.03 0.005 0.213
67 0.15 0.021 0 0.014 0.0073 0.002 0.04 0.005 0.213
68 0 0.024 0 0.019 0.0051 0.002 0.05 0.005 0.195
69 0.15 0.028 0.001 0.017 0.0039 0.003 0.04 0.004 0.215
70 0.04 0.038 0.001 0.012 0.0045 0.003 0.03 0.004 0.183
Table 5-6
No. [A]＝(Cr +Mo)/nt [B]＝C/(T i+20×B) Tensile strength (MPa) Percentage elongation (%) Impact value-20 ℃ (J) Reference
33 0.40 0.35 508 28 40
34 0.34 0.52 693 22 35
35 0.87 0.36 565 25 33
36 0.23 0.59 696 20 24
37 0.29 0.35 544 26 33
38 0.63 0.49 701 20 21
39 0.63 0.48 603 23 38
40 0.25 0.57 697 20 30
41 0.11 0.49 540 25 37
42 0.10 0.48 525 26 34
43 0.66 0.64 692 21 27
44 0.59 0.67 693 21 26
45 0.15 0.66 587 25 34
46 0.22 0.44 512 21 30
47 0.16 0.33 580 24 37
48 0.25 0.78 515 25 36
49 0.24 0.32 698 20 21
50 0.16 0.38 563 24 37
51 0.17 0.45 585 25 83 Splash
52 0.18 0.45 506 26 53
53 0.31 0.47 698 20 21
54 0.09 0.50 557 25 35
55 0.09 0.36 576 26 37
56 0.09 0.50 625 24 36
57 1.04 0.43 559 26 29
58 1.02 0.39 653 23 27
59 0.27 0.24 537 21 47
60 0.17 0.24 637 20 43
61 0.14 0.39 582 25 29
62 0.15 0.66 585 25 114 Heat cracking takes place
63 0.46 0.44 608 26 103 Heat cracking takes place
64 0.27 0.37 548 26 113 Heat cracking takes place
65 0.18 0.42 525 25 125 Burn-off midway
66 0.37 0.60 703 19 14
67 0.24 0.38 693 21 23
68 0.20 0.49 592 25 95 Burn-off midway
69 0.30 0.60 701 20 24 Spread of voltage
70 0.23 0.45 542 24 44 Gas defects takes place

Claims (2)

1. the flux-cored wire that filling flux forms in the steel crust is characterized in that, contains based on the welding wire gross mass:
C:0.03～0.07 quality %,
Si:0.3～0.8 quality %,
Mn:1.5～2.2 quality %,
Ni:0.4～1.5 quality %,
The total amount of Cr and Mo: 0.05～0.60 quality %,
Ti:0.02～0.20 quality %,
B:0.005～0.020 quality %,
Mg:0.20～0.50 quality %,
And limit Al≤0.10 quality %,
Contain slag former: 1.0～2.0 quality %,
This slag former contains based on the welding wire gross mass:
F:0.30～0.70 quality %,
K:0.02～0.20 quality %,
And, be respectively according to the content of Cr, Mo, Ni, C, Ti, B at [A], [B], by formula [A]=(Cr+Mo)/Ni and [B]=C/ (during the value of Ti+20 * B) obtain,
[A] is 0.10～1.0
[B] is 0.12～0.58.
2. an electrogas arc welding metal that forms by electrogas arc welding is characterized in that, contains based on the gross mass of weld metal:
C:0.035～0.075 quality %,
Si:0.1～0.6 quality %,
Mn:1.1～1.8 quality %,
Ni:0.4～1.5 quality %,
The total amount of Cr and Mo: 0.05～0.60 quality %,
Ti:0.005～0.050 quality %,
B:0.002～0.008 quality %,
And, be defined as:
O≤0.05 quality %,
N≤0.007 quality %,
Al≤0.03 quality %,
P≤0.025 quality %,
S≤0.025 quality %,
Nb≤0.1 quality %,
Surplus is that Fe:90 quality % is above, Cu, V and unavoidable impurities,
And, be respectively according to the content of C, Si, Mn, Cu, Ni, Cr, Mo, V, B at PCM, [A], [B], during the value obtained by following formula,
PCM is 0.175～0.220,
[A] is 0.10～1.0,
[B] is 0.25～1.67,
This formula is:
PCM＝C+(Si/30)+(Mn/20)+(Cu/20)+(Ni/60)+(Cr/20)+(Mo/15)+(V/10)+(5×B)，
[A]＝(Cr+Mo)/Ni，
[B]＝C/(Ti+20×B)。
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