JP5107172B2 - Ni-base alloy welding material - Google Patents

Description

  The present invention relates to a Ni-base alloy welding material used for arc welding of structures and machine parts made of high chromium Ni-base alloys such as Inconel 600 alloy and Inconel 690 alloy, and particularly TIG welding or MIG welding. The present invention relates to a Ni-base alloy welding material used for the purpose.

Inconel 600 alloy having excellent stress corrosion cracking resistance in high-temperature and high-pressure water has been used as a structural material in a pressurized water nuclear plant, for example, a steam generator of a pressurized water nuclear plant. Furthermore, replacement with Inconel 690 alloy, which is excellent in resistance to stress corrosion cracking in high-temperature and high-pressure water, is being promoted. The steam generators and the like of these pressurized water nuclear power plants are joined at many places by arc welding, and among arc welding, they are joined by TIG welding or MIG welding. This Inconel 690 alloy (component composition: C: 0.15% or less, Si: 0.5% or less, Mn: 1.0% or less, S: 0.015% or less, Cr: 27.0-31.0% , Cu: 0.3% or less, Fe: 7.0 to 11.0%, the balance being Ni and inevitable impurities), the ASME of the American Opportunities Association (ASME) as a welding material for welding structural materials Ni-based alloy welding materials defined by boiler and pressure vessel standards (ASME CODE 2142) are generally used.

The Ni-base alloy welding material defined by ASME CODE2142 is in mass% (hereinafter,% indicates mass%) C: 0.04% or less, Si: 0.05% or less, Mn: 1.00% Hereinafter, P: 0.02% or less, S: 0.015% or less, Cr: 28.0 to 31.5%, Mo: 0.50% or less, Cu: 0.3% or less, Nb: 0.10 %, Al: 1.10% or less, Ti: 1.00% or less, Al + Ti: 1.5% or less, Fe: 7.0 to 11.0%, with the balance being Ni and inevitable impurities Has a composition. A weld zone obtained by performing TIG welding or MIG welding using a Ni-base alloy welding material having this component composition is excellent in mechanical strength at room temperature, weld crack resistance, and the like. However, a Ni-base alloy welding material that can obtain a welded portion that is still more excellent in weld crack resistance is now required, and as an example, C: 0.04% or less, Si: 0.01-0. 13%, Mn: 5% or less, Cr: 28.0 to 31.5%, Nb: 1.8% or less, Al: 0.5 to 1.1%, Ti: 0.5 to 1%, Al + Ti: 1.6% or less, Fe: 7.0 to 11.0%, V: 0.5% or less, further containing Ta: 0.01 to 3% as necessary, the balance being Ni and inevitable P, S, O, and N contained as inevitable impurities have a component composition composed of impurities, P: 0.02% or less, S: 0.015% or less, O: 0.01% or less, N: Ni-base alloy welding material restricted to 0.002 to 0.03% (see Patent Document 1), C: 0.04% Lower, Si: 0.01 to 0.5%, Mn: 7% or less, Cr: 28.0 to 31.5%, Nb: 0.5% or less, Ta: 0.005 to 3.0%, Fe : 7.0 to 11.0%, Al: 0.01 to 0.4%, Ti: 0.01 to 0.45%, V: 0.5% or less, the balance being from Ni and inevitable impurities P, S, O and N contained as the inevitable impurities are P: 0.02% or less, S: 0.015% or less, O: 0.01% or less, N: 0.00. A Ni-base alloy welding material defined in 002 to 0.1% (see Patent Document 2) has been proposed.
JP 2003-31473 A WO2005-070612

These conventional Ni-base alloy welding materials have a high resistance to weld cracking, but they are welded when butt-welding a high chromium Ni-base alloy thick plate having a thickness of 10 mm or more using the conventional Ni-base alloy welding material. Cracks may occur, and welds obtained by butt-welding thick plates using the conventional Ni-based alloy welding materials cause cracks in the welds when bending thick plates In addition, the current situation is that a sufficient solution to a decrease in the strength of the welded part has not been made.

Therefore, the present inventors conducted research to solve these problems. as a result,
(B) The low melting point compound forming element contained in the Ni base alloy welding material causes the low melting point compound to segregate at the weld and causes weld cracking and cracking when bending the weld. It is preferable to specify a low content of low melting point compound forming elements such as B and Ca contained in the material,
(B) In order to prevent these weld cracks and bending cracks in the welded part, the Mg, N, and Mn contained in the Ni-base alloy welding material are adjusted and added in a specific range to add segregation of low melting point compounds. It can be suppressed, and even if the weld is bent, it can be made difficult to crack,
(C) Research results such as the ability to maintain the strength of the weld at the same level as the base metal by adding a trace amount of Cu and Mo are obtained, and the amount of trace element addition based on these research results Cr: 28 to 31.5%, Fe: 8 to 10.5%, Al: 0.01 to 0.45%, Ti: 0.01 to less than 0.5%, Mo: 0.001-0.2%, W: 0.001-0.1%, Cu: 0.0001-0.01%, Nb: 0.01-0.1%, Ta: 0.0001-0. 01%, Mn: 0.05 to 0.50%, Mg: 0.0001 to 0.005%, N: 0.001 to 0.04%, Ca: 0.0001 to 0.01%, B: 0 0.0001 to 0.04%, Si: 0.01 to 0.5%, and if necessary, Zr: 0.005 to 0.5% and V: 0 Co, O, P, S and C, which contain one or two of 001 to 0.1%, the remainder is made of Ni and inevitable impurities, and are included as the inevitable impurities, Co: 0.1% Hereinafter, a Ni-based alloy welding material having a composition defined so that O: 0.01% or less, P: 0.005% or less, S: 0.005% or less, and C: 0.04% or less is used. When a high chromium Ni-base alloy thick plate is butt welded by arc welding such as MIG welding or TIG welding, cracking occurs in the welded part even if the thick plate is bent, and the strength of the welded part decreases. The result was that there was no such thing.

The present invention has been made based on such research results,
(1) Cr: 28 to 31.5%, Fe: 8 to 10.5%, Al: 0.01 to 0.45%, Ti: 0.01 to less than 0.5%, Mo: 0.001 to 0.2%, W: 0.001-0.1%, Cu: 0.0001-0.01%, Nb: 0.01-0.1%, Ta: 0.0001-0.01%, Mn : 0.05-0.50%, Mg: 0.0001-0.005%, N: 0.001-0.04%, Ca: 0.0001-0.01%, B: 0.0001-0 0.04%, Si: 0.01 to 0.5%, the remainder is made of Ni and inevitable impurities, and Co, O, P, S and C contained as the inevitable impurities are Co: 0.1% In the following, the component composition is defined so that O: 0.01% or less, P: 0.005% or less, S: 0.005% or less, and C: 0.04% or less. Ni base alloy welding material that,
(2) Cr: 28 to 31.5%, Fe: 8 to 10.5%, Al: 0.01 to 0.45%, Ti: 0.01 to less than 0.5%, Mo: 0.001 to 0.2%, W: 0.001-0.1%, Cu: 0.0001-0.01%, Nb: 0.01-0.1%, Ta: 0.0001-0.01%, Mn : 0.05-0.50%, Mg: 0.0001-0.005%, N: 0.001-0.04%, Ca: 0.0001-0.01%, B: 0.0001-0 0.04%, Si: 0.01 to 0.5%, and further Zr: 0.005 to 0.5%, the remainder comprising Ni and inevitable impurities, Co included as the inevitable impurities, O, P, S, and C are: Co: 0.1% or less, O: 0.01% or less, P: 0.005% or less, S: 0.005% or less, C: 0.0. Ni base alloy welding material having a specified ingredients composition to be 4% or less,
(3) Cr: 28 to 31.5%, Fe: 8 to 10.5%, Al: 0.01 to 0.45%, Ti: 0.01 to less than 0.5%, Mo: 0.001 to 0.2%, W: 0.001-0.1%, Cu: 0.0001-0.01%, Nb: 0.01-0.1%, Ta: 0.0001-0.01%, Mn : 0.05-0.50%, Mg: 0.0001-0.005%, N: 0.001-0.04%, Ca: 0.0001-0.01%, B: 0.0001-0 0.04%, Si: 0.01 to 0.5%, further containing V: 0.001 to 0.1%, the remainder consisting of Ni and inevitable impurities, Co included as the inevitable impurities, O, P, S and C are: Co: 0.1% or less, O: 0.01% or less, P: 0.005% or less, S: 0.005% or less, C: 0.0 % Ni base alloy welding material having a specified ingredients composition to be less than,
(4) Cr: 28 to 31.5%, Fe: 8 to 10.5%, Al: 0.01 to 0.45%, Ti: 0.01 to less than 0.5%, Mo: 0.001 to 0.2%, W: 0.001-0.1%, Cu: 0.0001-0.01%, Nb: 0.01-0.1%, Ta: 0.0001-0.01%, Mn : 0.05-0.50%, Mg: 0.0001-0.005%, N: 0.001-0.04%, Ca: 0.0001-0.01%, B: 0.0001-0 0.04%, Si: 0.01 to 0.5%, Zr: 0.005 to 0.5%, V: 0.001 to 0.1%, the remainder being Ni and inevitable impurities Co, O, P, S and C contained as the inevitable impurities are Co: 0.1% or less, O: 0.01% or less, P: 0.005% or less, S: .005% or less, C: Ni base alloy welding material having a specified ingredients composition to be 0.04% or less, and it has the characteristics to.

  The Ni-base alloy welding material of the present invention is melted and cast using an ordinary high-frequency melting furnace to produce an ingot, and this ingot is subjected to homogenization heat treatment and hot forging while being held within a range of 1000 to 1230 ° C. Finally, a round bar having a diameter of 10 mm can be prepared, and after being subjected to a solution treatment by water quenching, the wire can be drawn by a hot roll.

  Next, the reason why the component composition of the Ni-based alloy welding material of the present invention is limited as described above will be described.

Cr:
Cr is a main element that improves the resistance to stress corrosion cracking in high-temperature and high-pressure water, and at the same time, an element that improves the strength of the weld. However, it is necessary to maintain the Cr content at 28% or more in order to fully exhibit the effect, but on the other hand, if it exceeds 31.5%, it becomes difficult to process at the time of manufacture, The amount was set at 28-31.5%. A more preferred range is 29-31%.

Fe:
Fe is added because it has the effect of suppressing weld solidification cracking, but if it is contained in an amount of less than 8%, the desired effect cannot be obtained. On the other hand, if it exceeds 10.5%, the stress corrosion cracking resistance deteriorates. This is not preferable. Therefore, the content of Fe is set to 8 to 10.5%. A more preferable range is 8.5 to 10.2%.

N, Mn and Mg:
The coexistence of N, Mn and Mg has an effect of improving the phase stability. That is, N, Mn, and Mg stabilize the Ni-fcc phase as a parent phase and promote the solid solution of low melting point compound forming elements such as P, S, Si, etc. There is an effect of suppressing generation.
However, if the N content is less than 0.001%, there is no effect of phase stabilization, and therefore, the effect of suppressing the formation of a low melting point compound in the weld solidified portion is lost, which is not preferable, while it exceeds 0.04%. If it is contained, nitrides are formed and high-temperature workability deteriorates, so that it becomes difficult to produce a welding material. Therefore, its content is set to 0.001 to 0.04%. A more preferable range of the N content is 0.005 to 0.03%.
Similarly, if the content of Mn is less than 0.05%, there is no effect of phase stabilization, and therefore, the effect of suppressing the formation of a low melting point compound in the weld solidified portion is lost. On the other hand, if the content exceeds 50%, a weld crack in the weld solidified portion is likely to occur, which is not preferable. Therefore, the Mn content is set to 0.05 to 0.5%. A more preferable range of the Mn content is 0.06 to 0.3%.
Similarly, if the Mg content is less than 0.0001%, there is no phase stabilization effect, and therefore, the effect of suppressing the formation of a low melting point compound in the weld solidified portion is lost, which is not preferable. If it is contained in excess, the phase stability is impaired, and weld cracks in the weld solidified portion are liable to occur, such being undesirable. Therefore, the content of Mg is set to 0.0001 to 0.005%. A more preferable range of Mg is 0.0002 to 0.003%.
The effects of these three elements are not equivalent to each other, and it has been found that there is no effect unless the three elements are contained in a predetermined range at the same time.

Si, Al and Ti
Si, Al, and Ti are all added as a deoxidizer, thereby improving the cleanliness in the alloy and consequently suppressing oxide-based impurities that cause one of the bending cracks in the weld. It is a component that improves the bending workability.
However, when Si is contained in an amount of 0.01% or more, the effect is exhibited. However, if Si is contained in an amount exceeding 0.5%, it is not preferable because bending cracks in the weld are induced. Therefore, the content of Si is set to 0.01 to 0.5%. A more preferable range of the Si content is 0.05 to 0.3%.
Similarly, when Al is contained in an amount of 0.01% or more, a cleaning effect in the alloy is shown. However, if it exceeds 0.45%, weld bending cracks are induced, so the Al content is reduced to 0. .01 to 0.45%. A more preferable range of the Al content is 0.1 to 0.3%.
Similarly, when Ti is contained in an amount of 0.01% or more, a cleaning effect in the alloy is exhibited. However, if it is contained in an amount of 0.5% or more, weld bending cracks are induced, which is not preferable. Therefore, the Ti content is 0.01 to 0. Set to less than 5%. A more preferable range of the Ti content is 0.1 to 0.4%.

Mo and W:
Both Mo and W are components added to improve the strength at the weld. However, Mo is effective when contained in an amount of 0.001% or more. However, if it exceeds 0.2%, Mo tends to segregate in the weld solidified portion and cause a decrease in stress corrosion cracking resistance. Was 0.001 to 0.2%. A more preferable range of the Mo content is 0.002 to 0.1%.
Similarly, when 0.001% or more of W is contained, the cleaning effect in the alloy is shown. However, if it exceeds 0.1%, it tends to segregate at the weld solidified portion and cause a decrease in stress corrosion cracking resistance. For this reason, the W content is set to 0.001% to 0.1%. A more preferable range of the W content is 0.002 to 0.01%.

Nb and Ta:
Nb and Ta both combine with C in the alloy to preferentially form a stable carbide such as NbC or TaC, thereby improving the stress corrosion cracking resistance, and Cr is also a carbide such as Cr ₂₃ C _6. By forming and locally forming a Cr diluted region, it is possible to suppress the deterioration of the stress corrosion cracking resistance, and the formed carbides such as NbC or TaC contribute to improving the strength of the weld.
However, when Nb is contained in an amount of 0.01% or more, the effect is exhibited. However, if the content exceeds 0.1%, the weld crack sensitivity tends to increase. %. A more preferable range of the Nb content is 0.02 to 0.08%.
Similarly, when Ta is contained in an amount of 0.0001% or more, the above effect is exhibited. However, if the content exceeds 0.01%, the cracking susceptibility of the welded portion due to bending tends to increase. It was set to 0001 to 0.01%. A more preferable range of the Ta content is 0.0001 to less than 0.005%.

B and Ca
B and Ca are added because they have the effect of improving the hot workability when producing a welding material as a welding material.
However, B must be contained in an amount of 0.0001% or more. However, if the content exceeds 0.04%, a low melting point compound is formed and weld cracking is likely to occur. It was set to 0001 to 0.04%. A more preferable range of the B content is 0.0002 to 0.008%.
Similarly, Ca needs to be contained in an amount of 0.0001% or more. However, if it exceeds 0.01%, a low melting point compound is formed and weld cracking is likely to occur. It was set to 0.0001 to 0.01%. A more preferable range of the Ca content is 0.0002 to 0.008%.

Cu:
Cu is added because it has the effect of preventing cracking during bending of the welded part by increasing the phase stability of the welded solidified part and suppressing the segregation and segregation of trace elements, but it contains less than 0.0001%. However, the desired effect cannot be obtained. On the other hand, if the content exceeds 0.01%, a low melting point compound is formed and weld cracking is likely to occur. Therefore, the Cu content is 0.0001 to 0.01%. Determined. A more preferable range of the Cu content is 0.0002 to 0.008%.

Zr:
Zr has an effect of improving by refining the weld solidification structure, and is added as necessary. However, if its content is less than 0.005%, the desired effect cannot be obtained. If the content exceeds 1%, it segregates during solidification and forms an oxide, which makes it easy to crack during bending of the welded portion, which is not preferable. Therefore, the Zr content is determined to be 0.005 to 0.1%. A more preferable range of the Zr content is 0.006 to 0.05%.

V:
V is added as needed because it has the effect of increasing the strength of the welded portion by solid solution in the matrix. However, if its content is less than 0.001%, the desired effect cannot be obtained. If the content exceeds 1%, the ductility is lowered and the rod cannot be processed. Therefore, the content of V is set to 0.001 to 0.1%. A more preferable range of the Zr content is 0.006 to 0.05%.

Inevitable impurities:
The smaller the content of Co contained as an inevitable impurity, the better. Therefore, the amount of Co is regulated to 0.1% or less, more preferably 0.05% or less.
O preferentially forms an oxide with an active element, and the formed oxide is concentrated at the dendritic interface in the solidified structure and becomes a starting point of cracking during bending of the welded portion, so that O is included as an inevitable impurity. Is regulated to 0.01% or less, more preferably 0.007% or less.
C forms Cr and carbide in the welded solidified structure to locally dilute Cr and lower the stress corrosion cracking resistance under high-temperature and high-pressure water. Therefore, the C content contained as an inevitable impurity is 0.04. % Or less, more preferably 0.02% or less.
S and P segregate and concentrate in the welded solidified structure, thereby easily forming a low melting point compound, thereby increasing the weld cracking susceptibility. Therefore, both are regulated to 0.005% or less.

The Ni-base alloy welding material of the present invention includes a welded portion that is not cracked even when it is bent by using it as a welding material for welding a Ni—Cr—Fe alloy known as Inconel 690 alloy. This makes it possible to construct a structure and contributes to increasing the reliability of the structure. In particular, Inconel 690 alloy has attracted attention as a material constituting the nuclear power plant, and by using it as a welding material that increases the reliability of the welded portion of the nuclear power plant made of this Inconel 690 alloy, an excellent industrial effect can be obtained. Is what it brings.

Next, the Ni-base alloy welding material of the present invention will be described in detail with reference to examples.
It melt | dissolved using the normal high frequency melting furnace, it had the component composition shown by Tables 1-9, and produced the ingot of about 5 kg with a diameter: 40mm. This ingot was subjected to a homogenization heat treatment at 1230 ° C. for 10 hours, and hot forging was performed while maintaining the temperature in the range of 1000 to 1230 ° C., and finally a round bar having a diameter of 10 mm was obtained. The solution was held for 30 minutes and then subjected to a solution treatment by quenching with water. This round bar is subjected to a hot roll drawing process to finally produce a welding material having a diameter of 2.4 mm, and the surface is polished with emery paper # 400, whereby the OLE_LINK4Ni alloy OLE_LINK4 welding material 1 to 40 of the present invention is obtained. Comparative Ni alloy welding materials 1 to 30 were prepared and prepared. In the wire drawing step, solidification heat treatment and pickling were repeated during the process to ensure workability.
Moreover, the same standard product as the commercially available ASTM CODE 2142 which was conventionally used as the welding materials 1 and 2 was prepared.

Next, a commercially available 690 alloy (UNS N06690) was subjected to 70 ° V-groove processing on the horizontal butt surfaces of two plates having dimensions of 200 mm × width: 100 mm × thickness: 20 mm. Each groove face is abutted and welded in the lateral direction of the plate using Ni alloy welding materials 1 to 40 of the present invention, comparative Ni alloy welding materials 1 to 30 and conventional welding materials 1 and 2 shown in Tables 1 to 9, respectively. As a result, a plate with a weld line having dimensions of length: 400 mm × width: 100 mm × thickness: 20 mm was produced. At this time, the welding conditions were all TIG welding. The argon gas flow rate was 14 to 15 liters / minute on the torch side, and the flow rate as the Ar gas back shield was 5 liters / minute. The welding current is 100 Amp. The number of passes was 10 layers and 10 passes. Care was taken that the interlayer temperature was 150 ° C. or lower. At this time, the presence or absence of weld cracks was confirmed, and the butt-welded plate without weld cracks proceeded to the next bending test.
To remove the bead surplus from the butt welded plate using a grinder and grinder, adjust the weld to the same thickness as the base metal, and perform a side bend test from the plate without this bead surplus Cut out the weld test pieces having the dimensions of width: 20 mm × length: 380 mm × thickness: 9.5 mm so that the cross-section is front and back and the weld line is included in the center parallel to the short side. The surface was finally polished to a water-resistant emery paper # 400 finish. A 180 ° bending test was performed so that the center of the welded test piece was the center of bending. The bending radius was 19 mm. After the test, the side of the welded part that became the bent part of the test piece was observed, and the presence or absence of cracks was observed with an actual microscope, and the results are shown in Tables 10-12.
Similarly, using a welded test piece having a width: 50 mm × length: 380 mm × thickness: 20 mm including the welded portion as a raw material, the tensile test piece is processed so that the weld joint is in the center, and this tensile test piece A tensile test was performed at room temperature to confirm whether the fracture portion was a welded portion or a base material portion, and the results are shown in Tables 10 to 12. It is because it is not preferable that the welded portion breaks because the strength is lower than that of the base material.
Similarly, a U vent test piece (width: 10 mm × length: 100 mm) with a weld joint portion at the center of a test piece having dimensions of width: 50 mm × length: 380 mm × thickness: 20 mm including the welded portion. × Thickness: A thick plate having a dimension of 3 mm was held in a U-shape), and this was held in water containing 500 ppm Cl ⁻ ions held at 300 ° C. in an autoclave for 1000 hours and then cracked The results are shown in Tables 10-12.

From the results shown in Tables 1 to 12, the welds of the weld specimens welded using the Ni alloy welding materials 1 to 40 of the present invention are welded parts of the weld specimens welded using the conventional welding materials 1 and 2. Compared to the above, no cracks were observed immediately after welding, no cracks were observed after the bending test, and all fractured parts of the tensile test were the base metal and had sufficient strength. It was confirmed that no corrosion cracking occurred.
Further, the welded part of the weld specimen prepared using the comparative Ni alloy welding materials 1 to 30 deviating from the present invention, cracks are observed immediately after welding, cracks are observed after the bending test, or tensile tests. It can be seen that the fracture occurred at the weld or stress corrosion cracking occurred. In addition, some of the comparative Ni alloy welding materials 1 to 30 that deviate from the present invention were cracked during the process of manufacturing the welding material, and the conventional welding materials 1 and 2 may be cracked during welding. I understand.

Claims (4)

In mass% (hereinafter,% represents mass%), Cr: 28 to 31.5%, Fe: 8 to 10.5%, Al: 0.01 to 0.45%, Ti: 0.01 to 0 Less than 5%, Mo: 0.001-0.2%, W: 0.001-0.1%, Cu: 0.0001-0.01%, Nb: 0.01-0.1%, Ta : 0.0001 to 0.01%, Mn: 0.05 to 0.50%, Mg: 0.0001 to 0.005%, N: 0.001 to 0.04%, Ca: 0.0001 to 0 .01%, B: 0.0001 to 0.04%, Si: 0.01 to 0.5%, the remainder is made of Ni and inevitable impurities, and Co, O, P, contained as the inevitable impurities S and C are Co: 0.1% or less, O: 0.01% or less, P: 0.005% or less, S: 0.005% or less, C: 0.04% or less Ni base alloy welding material characterized by having a chemical composition which is regulated so that. In mass% (hereinafter,% represents mass%), Cr: 28 to 31.5%, Fe: 8 to 10.5%, Al: 0.01 to 0.45%, Ti: 0.01 to 0 Less than 5%, Mo: 0.001-0.2%, W: 0.001-0.1%, Cu: 0.0001-0.01%, Nb: 0.01-0.1%, Ta : 0.0001 to 0.01%, Mn: 0.05 to 0.50%, Mg: 0.0001 to 0.005%, N: 0.001 to 0.04%, Ca: 0.0001 to 0 .01%, B: 0.0001 to 0.04%, Si: 0.01 to 0.5%, Zr: 0.005 to 0.5%, the remainder being Ni and inevitable impurities Co, O, P, S and C contained as the inevitable impurities are Co: 0.1% or less, O: 0.01% or less, P: 0.005% or less, 0.005% or less, C: Ni base alloy welding material characterized by having a regulating the chemical composition to be 0.04% or less. In mass% (hereinafter,% represents mass%), Cr: 28 to 31.5%, Fe: 8 to 10.5%, Al: 0.01 to 0.45%, Ti: 0.01 to 0 Less than 5%, Mo: 0.001-0.2%, W: 0.001-0.1%, Cu: 0.0001-0.01%, Nb: 0.01-0.1%, Ta : 0.0001 to 0.01%, Mn: 0.05 to 0.50%, Mg: 0.0001 to 0.005%, N: 0.001 to 0.04%, Ca: 0.0001 to 0 .01%, B: 0.0001 to 0.04%, Si: 0.01 to 0.5%, further V: 0.001 to 0.1%, the remainder being Ni and inevitable impurities Co, O, P, S and C contained as the inevitable impurities are Co: 0.1% or less, O: 0.01% or less, P: 0.005% or less, S 0.005% or less, C: Ni base alloy welding material characterized by having a regulating the chemical composition to be 0.04% or less. In mass% (hereinafter,% represents mass%), Cr: 28 to 31.5%, Fe: 8 to 10.5%, Al: 0.01 to 0.45%, Ti: 0.01 to 0 Less than 5%, Mo: 0.001-0.2%, W: 0.001-0.1%, Cu: 0.0001-0.01%, Nb: 0.01-0.1%, Ta : 0.0001 to 0.01%, Mn: 0.05 to 0.50%, Mg: 0.0001 to 0.005%, N: 0.001 to 0.04%, Ca: 0.0001 to 0 .01%, B: 0.0001 to 0.04%, Si: 0.01 to 0.5%, Zr: 0.005 to 0.5%, V: 0.001 to 0.1 Co, O, P, S, and C contained as the inevitable impurities are Co: 0.1% or less, O: 0.01% or less. , P: 0.005% or less, S: 0.005% or less, C: Ni base alloy welding material characterized by having a regulating the chemical composition to be 0.04% or less.