CN101966630B - Material and method for submerged arc welding of 9% Ni steel - Google Patents

Material and method for submerged arc welding of 9% Ni steel Download PDF

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CN101966630B
CN101966630B CN2010102340809A CN201010234080A CN101966630B CN 101966630 B CN101966630 B CN 101966630B CN 2010102340809 A CN2010102340809 A CN 2010102340809A CN 201010234080 A CN201010234080 A CN 201010234080A CN 101966630 B CN101966630 B CN 101966630B
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welding
quality
weld
arc welding
mass
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CN101966630A (en
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福田和博
铃木正道
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Kobe Steel Ltd
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Kobe Steel Ltd
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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
    • 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
    • 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
    • B23K35/362—Selection of compositions of fluxes
    • 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
    • B23K9/00—Arc welding or cutting
    • B23K9/18—Submerged-arc welding
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/03—Alloys based on nickel or cobalt based on nickel
    • 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
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/04—Tubular or hollow articles
    • B23K2101/12—Vessels

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  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

Provided is a sintered type welding flux for submerged arc weld of 9% Ni steel, which has good slag striping property and anti-welding defect property even if during welding in a vertical position, besides a upward position and a transverse position, and can obtain the smoothing property of excellent weld joint shape. The sintered type welding flux for submerged arc weld of 9% Ni steel combined with a welding wire containing more than 60% by mass of Ni is composed of: relative to the total mass of the soldering flux, 15-40 % by mass of Al2O3, 5-35% by mass of SiO2, 5-25% by mass of ZrO2, 5-25% by mass of MgO, 5-25% by mass of CaCO3 and 1-7% by mass of Al, less than 5% by mass of CaF2, the rest Fe, Na2O and unavoidable impurities.

Description

9%Ni steel submerged arc welding material and welding method
Technical field
The present invention relates to the welding material of the submerged-arc welding of the 9%Ni steel that uses with the construction material of storage tank for this utmost point cryogenic liquid of liquefied natural gas, particularly relate to and to weld to the welding position vertical, and also go for lower to reaching the lateral attitude, have good welding slag fissility, and can obtain 9%Ni steel submerged arc welding material and the welding method of the flatness of excellent anti-defective and weld seam.
Background technology
Always, in the welding of the 9%Ni steel that the construction material as utmost point cryogenic liquid storage tank uses, use the lower welding rod arc welding method of heat input in order to prevent heat cracking.Thereafter, the welding wire of high-temperature cracking resistance excellence is developed, and rises to purpose with the efficiency of construction of welding fabrication, under applicable to or the place of lateral attitude welding increased the application of submerged-arc welding method.
On the other hand, in the welding of position, use automatic TIG welding vertical for efficiency of construction improves, another part is the automatic MAG weldingization of development.But in the construction, in the region that obtains difficulty of welding gas, still have to depend on the situation of welding rod arc welding method at the scene.
Therefore, in order to improve the efficiency of construction in the scene that can not obtain welding gas, just require to develop and the submerged-arc welding method can be applied to the welding material of upward welding in the vertical position.
Always, exist in the submerged arc welding material of cryogenic steel as inferior problem points: vertical when welding to the position, because gravity flows, so weld shape is easily unstable in process of setting for motlten metal, become convex, need to make weld seam become level and smooth with grinder.
Therefore, for example in No. 2009-039761, TOHKEMY, disclose a kind of used for submerged arc welding solder flux of cryogenic steel, it contains Al with respect to the solder flux gross mass 2O 3: 31～60 quality %, CaF 2: 10～40 quality %, SiO 2: 1～10 quality %, Na 2O:0.1～5 quality %, metal A l:1～10 quality %, other are CaCO 3, CaO, MgO, metal M n and inevitable impurity.
The technology that No. 2009-039761, TOHKEMY, by solder flux is formed the above-mentioned scope that is defined in, except lower to and the lateral attitude, even vertical in the welding of position, also can realize the raising of arc stability, welding slag fissility, anti-weld defect and weld shape.
But, although above-mentioned look-ahead technique is insufficient on the flatness of weld seam in vertical arc stability, welding slag fissility and anti-weld defect raising in the welding of position.The easy discontinuous such problem points of shape that the weld seam longitudinally is particularly arranged.Therefore, in the welding of position, just the solder flux that can fully satisfy welding slag fissility, anti-weld defect and weld shape stability (flatness) this used for submerged arc welding of whole several is developed in expectation vertical.
Summary of the invention
The present invention does in view of this problem points, its purpose is, a kind of 9%Ni steel submerged arc welding material and welding method are provided, except lower to and the lateral attitude, even standing in the welding of position, it also can have good welding slag fissility and anti-weld defect, can access in addition the flatness of excellent weld shape.
9%Ni steel submerged arc welding material of the present invention is made of welding wire for hidden arc welding and used for submerged arc welding sintered flux, and more than described welding wire contained Ni:60 quality % with respect to the welding wire gross mass, it consisted of described solder flux, with respect to the solder flux gross mass, contains Al 2O 3: 15～40 quality %, SiO 2: 5～35 quality %, ZrO 2: 5～25 quality %, MgO:5～25 quality %, CaCO 3: 5～25 quality % and metal A l:1～7 quality %, and with CaF 2Be suppressed at below 5 quality %, surplus is metal Fe, Na 2O and inevitable impurity.
The submerged-arc welding method of 9%Ni steel of the present invention is to use with respect to the welding wire gross mass to contain welding wire for hidden arc welding and used for submerged arc welding sintered flux more than Ni:60 quality %, and consisting of of described solder flux with respect to the solder flux gross mass, contains Al 2O 3: 15～40 quality %, SiO 2: 5～35 quality %, ZrO 2: 5～25 quality %, MgO:5～25 quality %, CaCO 3: 5～25 quality % and metal A l:1～7 quality %, and with CaF 2Be suppressed at below 5 quality %, surplus is metal Fe, Na 2O and inevitable impurity.
In above-mentioned 9%Ni steel submerged arc welding material and 9%Ni steel submerged-arc welding method, described solder flux preferably contains metal Ti: 0.1～5 quality %.
Above-mentioned 9%Ni steel submerged-arc welding method can be used in standing the submerged-arc welding of upwards welding posture.
According to the present invention, can have good welding slag fissility and anti-weld defect, have in addition the 9%Ni steel submerged-arc welding method of the flatness of excellent weld shape.
Description of drawings
Fig. 1 mean the welding position be lower to the time the figure of shape and size of welding base metal, wherein (a) is front view, (b) is the profile of expression groove shape, (c) is the ideograph of the stacked main points of expression.
Fig. 2 means the figure of the shape and size of the welding base metal the when welding position is horizontal, and wherein (a) is front view, (b) for the profile of expression groove shape, (c) is the ideograph of the stacked main points of expression.
Fig. 3 mean the welding position be vertical to the time the figure of shape and size of welding base metal, wherein (a) be front view, (b) is the profile of expression groove shape, (c) for representing the ideograph of stacked main points.
Fig. 4 means the criterion of maximum concavo-convex change among the weld shape evaluation criterion, and wherein (a) is front view, is (b) profile.
Fig. 5 means the figure of the criterion of Breadth Maximum change among the weld shape evaluation criterion.
The specific embodiment
The present inventors find, when using the welding wire that contains with respect to the welding wire gross mass more than Ni:60 quality % to carry out the submerged-arc welding of 9%Ni steel, by flux constituent being carried out various adjustment, except Al 2O 3In addition, with MgO, CaCO 3, ZrO 2Deng the high-melting-point oxide as main component, not only for lower to and the lateral attitude under the smoothing of shape of weld seam effective, even and vertical to the welding position smoothing for the shape of weld seam also effective.The present inventors also find in addition, for CaF 2Although, have the fine and closely woven effect of ripple that makes weld seam, both quantitatively contained if surpass, weld shape is easily discontinuous, the tendency that also has pore also to increase in addition.The present inventors have completed the present invention based on these discoveries.
Below, add reason and form limiting reason and describe for the composition of the sintered flux that uses in 9%Ni steel of the present invention submerged-arc welding.
Al 2O 3: 15～40 quality %
Al in solder flux 2O 3Playing a role as the welding slag forming agent, is effective composition on the setting temperature that improves liquid slag and viscosity.Al in solder flux 2O 3During lower than 15 quality %, vertical in the welding of position the weld seam confining force of liquid slag not enough, weld seam becomes convex, burns.On the other hand, Al 2O 3When surpassing 40 quality %, the viscosity of welding slag becomes too high, and therefore slag inclusion occurs poor fluidity.In addition, if Al 2O 3Surpass 40 quality %, except lower to the ripple chap of lateral attitude weld seam, also pit can occur.
Preferred scope is Al 2O 3: 20～35 quality %.In this scope, particularly vertical in the welding weld seam confining force of liquid slag more suitable, weld shape is stable and therefore smoothing can access better weld appearance.
SiO 2: 5～35 quality %
SiO in solder flux 2Need to be 5～35 quality %.SiO in solder flux 2Improve the setting temperature of liquid slag.At the vertical confining force that improves weld seam to the position, has the stable effect of the weld shape of making in addition.SiO 2During lower than 5 quality %, the weld seam confining force of liquid slag is not enough, so weld shape is unstable.On the other hand, if SiO 2Surpass 35 quality %, the viscosity of liquid slag becomes too high, welding slag peel off deterioration, slag inclusion occurs.
Preferred scope is SiO 2: 10～25 quality %.In this scope, the fissility of welding slag improves, and particularly can obtain better welding slag fissility vertical to the position, and weld shape is stable and therefore smoothing can access good weld appearance.In this scope, lower weld shape when welding with the lateral attitude is also stable.At SiO 2In, except quartz sand, waterglass, also can add the composite oxides of wollastonite etc.
ZrO 2: 5～25 quality %
ZrO in solder flux 2Effective composition making the welding slag fissility on good.ZrO 2Can not get this effect during lower than 5 quality %, make on the contrary welding slag at weld seam sintering etc., the welding slag fissility is poor.On the other hand, if ZrO 2Surpass 25 quality %, the mobility of liquid slag reduces, and slag inclusion easily occurs.
Preferred scope is, ZrO 2: 10～20 quality %.In this scope, the welding slag fissility improves, and particularly can access better welding slag fissility to the position vertical, and weld shape is stable and therefore smoothing can access good weld appearance.
MgO:5～25 quality %
The effect that the setting temperature that makes welding slag of having MgO in solder flux rises is effective composition to the weld shape stability of longitudinally.This efficient can't obtain lower than 5 quality % the time, in the vertical arc burn that mostly occurs to the position.On the other hand, if MgO surpasses 25 quality %, welding slag solidify completely ahead of time, so weld shape becomes convex, except easy generation slag inclusion, the welding slag fissility also worsens.
Preferred scope is MgO:10～20 quality %.In this scope, the welding slag fissility improves, and particularly can obtain better welding slag fissility to the position vertical, and weld shape is stable and therefore smoothing can access good weld appearance.
CaCO 3: 5～25 quality %
CaCO in solder flux 3Need to be 5～25 quality %.CaCO 3Fusion and decomposition becomes CaO and CO 2Gas, and CO 2The effect that gas has is to reduce the steam partial pressure in welding arc atmosphere, the hydrogen amount in the reduction weld metal, and reduction pore.In addition, CaO has the effect of the setting temperature that improves liquid slag, makes weld shape stable.CaCO 3In the zone lower than 5 quality %, except can not get above-mentioned effect, weld shape also becomes convex.On the other hand, CaCO 3In the zone that surpasses 25 quality %, the welding slag fissility is poor.
Preferred scope is CaCO 3: 10～20 quality %.In this scope, the setting temperature of welding slag further rises, and weld shape is stablized and smoothing more, therefore can access good weld appearance.
Metal A l:1～7 quality %
Metal A l adds in solder flux as deoxidier, thereby the oxygen amount in weld metal is significantly reduced, and is the composition with the effect that reduces the pore generation.If metal A l lower than 1 quality %, can not fully obtain this effect with respect to the solder flux gross weight.On the other hand, if surpass 7 quality % with respect to the solder flux gross weight, the welding slag fissility worsens.Metal A l can add in solder flux by monomer or Fe-Al alloy etc.
Preferred scope is metal A l:2～5 quality %.In this scope, good welding slag fissility and gasproof permeability can be existed side by side.
CaF 2: below 5 quality %
In existing used for submerged arc welding solder flux, CaF 2Be used as essential component and add, but in the present invention with CaF 2Be suppressed at below 5 quality %.CaF 2Although have the arc stability of making, make the fine and closely woven effect of ripple of weld seam, the setting temperature of reduction welding slag and the effect of viscosity are also arranged, therefore make the weld shape of longitudinally unstable vertical in the welding of position especially, weld seam easily burns.The CaF of this tendency in solder flux 2Show significantly when surpassing 5 quality %, so CaF 2Need to be suppressed at below 5 quality %.
Metal Ti: 0.1～5 quality %
Ti rises the setting temperature of welding slag, has laterally and the vertical effect of burning that suppresses weld seam during to welding.If metal Ti lower than 0.1 quality %, can not fully obtain this effect with respect to the solder flux gross weight.On the other hand, if Ti surpasses 5 quality % with respect to the solder flux gross weight, the welding slag fissility worsens.Be 0.1～5 quality % when therefore, containing metal Ti.Metal Ti is with interpolations such as monomer or Fe-Ti.
[embodiment]
Below, embodiment specifically describes effect of the present invention usually.At first, adjust the solder flux raw material, after wherein adding waterglass and granulation as adhesive, carry out sintering, make thus the used for submerged arc welding sintered flux with the various chemical compositions shown in following table 1.
[table 1]
Figure BSA00000202441800061
Use respectively mother metal and the welding wire with the chemical composition shown in following table 2 and table 3.
[table 2]
Figure BSA00000202441800062
[table 3]
Figure BSA00000202441800063
Down hill welding connects with the welding condition shown in following table 4 and carries out.Shape and the size of the welding base metal during down hill welding connects are presented in Fig. 1.Fig. 1 (a) mean the welding position be lower to the time the front view of shape and size of welding base metal, Fig. 1 (b) is the ideograph of the stacked main points of expression for the profile of expression groove shape, Fig. 1 (c).
[table 4]
The welding position Lower to
Polarity DCEP (drag flow just connects)
Gage of wire 2.4mm
Electric current (A) 330～350
Voltage (V) 30～32
Speed (cm/ divides) 30
Extend 25mm
Weld length 500mm
Transverse weld is carried out with the welding condition shown in following table 5.Shape and the size of the welding base metal in transverse weld are presented in Fig. 2.Fig. 2 (a) mean the welding position be lower to the time the front view of shape and size of welding base metal, Fig. 2 (b) is the ideograph of the stacked main points of expression for the profile of expression groove shape, Fig. 2 (c).
[table 5]
The welding position Laterally
Polarity DCEP (drag flow just connects)
Gage of wire 2.4mm
Electric current (A) 250～300
Voltage (V) 26～28
Speed (cm/ divides) 30～45
Extend 25mm
Weld length 500mm
Stand to welding and carry out with the welding condition shown in following table 6.Shape and the size of vertical welding base metal in welding are presented in Fig. 3.Fig. 3 (a) mean the welding position be lower to the time the front view of shape and size of welding base metal, Fig. 3 (b) is the ideograph of the stacked main points of expression for the profile of expression groove shape, Fig. 3 (c).
[table 6]
The welding position Upward welding in the vertical position
Polarity DCEP (drag flow just connects)
Gage of wire 1.2mm
Electric current (A) 170
Voltage (V) 26
Speed (cm/ divides) 12
Extend 15mm
Weld length 500mm
Above evaluation result is presented in table 7.Following to, laterally, vertical to each welding position implement submerged-arc welding, try to achieve weld shape and welding slag fissility (welding operation), in addition, implement the radioactivity transmission test of weld part.
[table 7]
The evaluation of weld shape in weld length 500mm, judges that the visual field is 30 * 30mm as shown in Figure 4 and Figure 5, judges except arc crater section with apart from the concavo-convex change of the height of the weld seam central portion of the starting the arc 50mm of section and horizontal weld width change maximum position.Fig. 4 means the figure of the criterion of maximum concavo-convex change, and wherein (a) is front view, is (b) profile.Fig. 5 is the figure of the criterion of Breadth Maximum change.The position in the concavo-convex and horizontal wide judgement visual field is independent respectively, adopts the criterion of table 8, among the result of determination that concavo-convex change is poor, horizontal wide change is poor, adopts the decision level of low level as result of determination.
[table 8]
Decision level Maximum concavo-convex change is poor Maximum horizontal wide change is poor
◎ Below 2mm Below 3mm
○ Greater than 2mm but below 4mm Greater than 3mm but below 6mm
△ Greater than 4mm but below 7mm Greater than 6mm but below 8mm
× Greater than 7mm Greater than 8mm
Do not list this judgement in if * do not satisfy two Fang Ze
Example 1) when concavo-convex poor 3mm, horizontal wide change 0.5mm, judgement zero
Example 2) when concavo-convex poor 5mm, horizontal wide change 9mm, judgement *
The welding slag fissility be by utilize that slag hammer carries out lower than the shock of 11 times, that through weld total length welding slag is peeled off fully is ◎, after utilizing slag hammer to carry out clashing into for 10 times, welding slag has some residual at the groove part place of grading, but be zero through 11 to what can remove fully lower than the shock of the slag hammer of 20 times, although removing whole welding slags with slag hammer has any problem, but peel off special-purpose instrument by welding slags such as chisels and can make the △ that is that welding slag peels off easily, though use above-mentioned instrument can not remove fully welding slag for *.
Implement radioactivity transmission test for weld part in addition, JIS Z 3106 is used for criterion estimates anti-defective.That is, in radioactivity transmission test, as follows about the sorting technique of the picture of the defective of welding point in the transmission test: the pore of circle and the defective that is similar to this are the 1st kind; Elongated slag inclusion, pipe (パ イ プ), lack of penetration, incomplete fusion and the defective that is similar to this are the 2nd kind; Crackle is the 3rd kind with the defective that is similar to this.Also have, so to the 1st kind of defective or the 2nd kind of inconvenient defective of defective difference, as the 1st kind of defective or the 2nd kind of defective difference independent sorting, side's classifying and numbering that wherein classifying and numbering is large is the species of this defective with it.The 1st defective number is followed following methods and is tried to achieve.That is, in the mensuration of the 1st defective number, thickness of slab is 20mm, and the size of therefore testing the visual field is 10mm * 10mm.When defective is on the boundary line of testing the visual field, comprises visual field part in addition and measure.Defective number when the 1st kind of defective is one adopts the value of following table 9 according to the size of the major diameter of defective.Defective is two defective numbers when above, is the summation of the defective number that is present in each defective in the test visual field.
[table 9]
Following table 10 is followed in the classification of the picture of the 1st kind of defective.The permissible value of the defective number in the visual field is tested in numeric representation in table 10.But 1/2 o'clock of thickness that the major diameter of defective surpasses mother metal is the 4th class.
[table 10]
Figure BSA00000202441800112
Following table 11 is followed in the classification of the picture of the 2nd kind of defective.The size in the test visual field is identical with the 1st kind.Also have, when being categorized as 1 class, if having lack of penetration or incomplete fusion be 2 classes.
The mm of [table 11] unit
Figure BSA00000202441800113
Compressive classification about defective carries out as follows.That is, when the species of defective were 1 class, this was categorized as compressive classification.The species of defective are 2 classes when above, and the side that classifying and numbering wherein is large is compressive classification.But, when being mixed with the 2nd kind of defective as the object of classification in the test visual field of the first defective, if be same classification based on the classification of defective number with based on the classification of defect length, the classification of the part of mixing is that to make classifying and numbering be a larger numbering.At this moment, in 1 class, if surpass the 1st kind and the 2nd kind defective permission length 1/2 be divided into 2 classes.
As shown in above-mentioned table 1 and table 7, the chemical composition in embodiment 1～6 its solder flux has obtained suitable regulation, and weld shape flatness and welding slag fissility when therefore welding are good, are all also an a kind of judgement of class in radioactivity transmission test evaluation.
In embodiment 7, because the content of the Ti in solder flux is lower than the lower limit of the scope of the invention, so compare with embodiment 1～6, weld shape is a bit unstable.
In embodiment 8, the content of the Ti in solder flux surpasses the upper limit of the scope of the invention, so the molten slag fissility is slightly poor.
(comparative example 9 and 10)
On the other hand, comparative example 9 is because the Al in solder flux 2O 3Content surpass the upper limit of the scope of the invention, SiO 2Content lower than the lower limit of the scope of the invention, following to thick with the ripple of transverse weld weld seam, this is external vertical in welding, weld shape is unstable and slag inclusion occurs.
(comparative example 11 and 12)
Comparative example 11 is because the ZrO in solder flux 2Content surpass the upper limit of the scope of the invention, CaCO 3Content lower than the lower limit of the scope of the invention, so the weld shape flatness reduces, slag inclusion occurs.
Comparative example 12 is because the ZrO in solder flux 2Content lower than the lower limit of the scope of the invention, CaCO 3Content surpass the upper limit of the scope of the invention, so the welding slag sintering occurs, the welding slag fissility reduces.
(comparative example 13 and 14)
Comparative example 13 is because the content of the MgO in solder flux surpasses the upper limit of the scope of the invention, and the content of Al is lower than the lower limit of the scope of the invention, so weld shape becomes convex, soldered shape flatness reduces, and in welding, slag inclusion occurs vertical.In addition, the gasproof permeability reduces.
Comparative example 14 because the content of the MgO in solder flux lower than the lower limit of the scope of the invention, the content of Al surpasses the upper limit of the scope of the invention, so except the welding slag fissility reduced, the confining force of motlten metal also reduced, cause laterally reducing with vertical weld shape flatness in welding.
(comparative example 15)
Comparative example 15 because the content of the Ti in solder flux lower than the lower limit of the scope of the invention, CaF 2Content surpass the upper limit of the scope of the invention, so soldered shape flatness reduces, burn during to welding vertical.
(comparative example 16 and 17)
Comparative example 16 and 17 because the content of the MgO in solder flux lower than the lower limit of the more preferably scope of the scope of the invention, CaF 2Content surpass the upper limit of the scope of the invention, so laterally and vertical weld shape flatness in welding reduce, burn in welding vertical.
As described in detail above, according to the present invention, by the chemical composition in suitable regulation 9Ni steel used for submerged arc welding sintered flux, lower to, laterally and vertical flatness, welding slag fissility and the anti-weld defect that can obtain excellent weld seam in the welding of position.

Claims (5)

1. a 9%Ni steel submerged arc welding material, is characterized in that,
Described welding material is made of welding wire for hidden arc welding and used for submerged arc welding sintered flux,
More than described welding wire contains Ni:60 quality % in the welding wire gross mass,
The composition of described solder flux contains Al in the solder flux gross mass 2O 3: 15～40 quality %, SiO 2: 5～35 quality %, ZrO 2: 5～25 quality %, MgO:5～25 quality %, CaCO 3: 5～25 quality % and metal A l:1～7 quality %, and with CaF 2Be suppressed at below 5 quality %, surplus contains metal Fe, Na 2O and inevitable impurity.
2. 9%Ni steel submerged arc welding material according to claim 1, is characterized in that, described solder flux contains metal Ti: 0.1～5 quality %.
3. the submerged-arc welding method of a 9%Ni steel, is characterized in that, use in the welding wire gross mass to contain welding wire for hidden arc welding and used for submerged arc welding sintered flux more than Ni:60 quality %,
The composition of described solder flux contains Al in the solder flux gross mass 2O 3: 15～40 quality %, SiO 2: 5～35 quality %, ZrO 2: 5～25 quality %, MgO:5～25 quality %, CaCO 3: 5～25 quality % and metal A l:1～7 quality %, and with CaF 2Be suppressed at below 5 quality %, surplus contains metal Fe, Na 2O and inevitable impurity.
4. 9%Ni steel submerged-arc welding method according to claim 3, is characterized in that, described solder flux contains metal Ti: 0.1～5 quality %.
5. 9%Ni steel submerged-arc welding method according to claim 3, is characterized in that, upwards welds posture and carry out submerged-arc welding with vertical.
CN2010102340809A 2009-07-27 2010-07-20 Material and method for submerged arc welding of 9% Ni steel Expired - Fee Related CN101966630B (en)

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