Austenitic stainless steel welding wire and welding structure

1. A welding wire for austenitic stainless steel welding, comprising:

at least one portion containing, about, C, 0.005 through 0.05%, Si: 0.1 through 1.0%, Mn: 0.1 through 3.5%, Cr: 25.0 through 28.0%, Ni: 16.0 through 23.9%, Mo: 1.6 through 3.0%, Cu: 0.1 through 0.5%, Al: 0.001 through 0.02%, and N: 0.03 through 0.50% in percent by mass with respect to a total mass of the wire in a solid wire, an outer coat, or an outer coat and a flux, and furthermore, limiting P to between about 0.03% to greater than 0% and limiting S to between about 0.005% to greater than 0%, and in a case of a solid wire, limiting O to between about 0.03 to greater than 0%, having a ratio of a Cr equivalent to Ni equivalent (Cr equivalent/Ni equivalent) defined by the following equations (1) and (2) within a range between about 0.85 and 1.2, and a PI value of about 35 or more defined by the following equation (3), the remainder being iron and unavoidable impurities other than P, O, and S:

Cr equivalent=Cr+Mol+1.5×Si  (1)

Ni equivalent=Ni+0.5×Mn+30×C+30×N (N is 0.03% through 0.30%), or

Ni equivalent=Ni+0.5×Mn+30×C+19.5×N (N is more than 0.30% and equal to or less than 0.50%)  (2)

PI value=Cr+3.3×Mo+16×N (N is 0.03% through 0.30%), or

PI value=Cr+3.3×Mo+10.4×N (N is more than 0.30% and equal to or less than 0.50%)  (3)

wherein the Cr, Mo, Si, Ni, Mn, C, and N indicate contents (percent by mass) of the at least one portion.

2. The welding wire for austenitic stainless steel welding according to claim 1 , wherein the at least one portion further contains at least one of, about, Ti: 0.01 through 0.3%, Nb: 0.01 through 0.3%, Ca: 0.0005 through 0.0050%, or Mg: 0.0005 through 0.0050% in percent by mass.

3. An austenitic stainless steel welding structure comprising:

at least one austenitic stainless steel base metal portion containing, about, C, 0.005 through 0.03%, Si: 0.1 through 1.5%, Mn: 0.1 through 3.0%, Ni: 15.0 through 21.0%, Cr: 22.0 through 28.0%, Mo: 1.5 through 3.5%, N: 0.15 through 0.35%, W: between 3.0% to greater than 0%, Al: 0.005 through 0.1% to greater than 0% in percent by mass, limiting O to between 0.007% to greater than 0%, limiting P to 0.05% to greater than 0%, and limiting S to 0.003% to greater than 0%, having a PIW value defined by the following equation (4) within a range between about 35 and 40, and a δ cal value defined by the following equation (5) within a range between about −6 and +4, the remainder being iron and unavoidable impurities; and

at least one weld metal portion that is formed at a weld zone, containing, about, C: 0.005 through 0.05%, Si: 0.1 through 1.0%, Mn: 0.1 through 3.5%, Cr: 25.0 through 28.0%, Ni: 16.0 through 23.9%, Mo: 1.6 through 3.0%, Cu: 0.1 through 0.5%, Al: 0.001 through 0.02%, and N: 0.03 through 0.35% in percent by mass, limiting O to between 0.10% to greater than 0%, P to between 0.03% to greater than 0%, and limiting S to between 0.005% to greater than 0%, having a ratio of a Cr equivalent to Ni equivalent (Cr equivalent/Ni equivalent) within a range between about 0.85 and 1.2 defined by the following equations (6) and (7), and having a PI value of about 35 or more defined by the following equation (8), the remainder being iron and unavoidable impurities other than P, O, and S:

PIW value=Cr+3.3(Mo+0.5W)+16N  (4)

δ cal value=2.9(Cr+0.3Si+Mo+0.5W)−2.6(Ni+0.3Mn+0.25Cu+32C+20N)−18  (5)

wherein the Cr, Mo, W, N, Si, Mn, Cu, and C indicate the contents (percent by mass) of the respective components in the at least one steel material portion, and

Cr equivalent=Cr+Mo+1.5×Si  (6)

Ni equivalent=Ni+0.5×Mn+30×C+30×N  (7)

PI value=Cr+3.3×Mo+16×N  (8)

wherein the Cr, Mo, Si, Ni, Mn, C, and N indicate contents (percent by mass) of the at least one weld metal portion.

4. The austenitic stainless steel welding structure according to claim 3 , wherein the at least one base metal portion further contains at least one of, about, Cu: 0.1 through 2.0%, Ti: 0.003 through 0.03%, Nb: 0.02 through 0.20%, or V: 0.05 through 0.5%.

5. The austenitic stainless steel welding structure according to claim 3 , wherein the at least one weld metal portion further contains at least one of, about, Ti: 0.01 through 0.3%, Nb: 0.01 through 0.3%, Ca: 0.0005 through 0.0050%, or Mg: 0.0005 through 0.0050% in percent by mass.

6. An austenitic stainless steel welding structure comprising:

at least one austenitic stainless steel base metal containing, about, C: 0.005 through 0.03%, Si: 0.1 through 1.5%, Mn: 0.1 through 3.0%, Ni: 15.0 through 21.0%, Cr: 22.0 through 28.0%, Mo: 1.5 through 3.5%, N, 0.15 through 0.35%, Al: 0.005 through 0.1% to greater than 0% in percent by mass, limiting O to between 0.007% to greater than 0%, limiting P to between 0.05% to greater than 0%, and limiting S to between 0.003% to greater than 0%, further containing one, two or more of Cu: 0.1 through 2.0%, Ti: 0.003 through 0.03%, Nb: 0.02 through 0.20%, V: 0.05 through 0.5%, and W: 0.3 through 3.0%, having a PIW value defined by the following equation (4) within a range between about 35 and 40, and a δ cal value defined by the following equation (5) within a range between about −6 and +4, the remainder being iron and unavoidable impurities other than P, O, and S, and

at least one weld metal portion that is formed at a weld zone, containing, about, C: 0.005 through 0.05%, Si: 0.1 through 1.0%, Mn: 0.1 through 3.5%, Cr: 25.0 through 28.0%, Ni: 16.0 through 23.9%, Mo: 1.6 through 3.0%, Cu: 0.1 through 0.5%, Al: 0.001 through 0.02%, and N: 0.03 through 0.35% in percent by mass, limiting O to between 0.10% to greater than 0%, limiting P to between 0.03% to greater than 0%, and limiting S to between 0.005% to greater than 0%, further containing one, two, or more of Ti: 0.01 through 0.3%, Nb: 0.01 through 0.3%, Ca: 0.0005 through 0.0050%, and Mg: 0.0005 through 0.0050%, having a ratio of a Cr equivalent to Ni equivalent (Cr equivalent/Ni equivalent) within a range between about 0.85 and 1.2 defined by the following equations (6) and (7), and having a PI value of about 35 or more defined by the following equation (8), the remainder being iron and unavoidable impurities other than P, O, and S:

PIW value=Cr+3.3(Mo+0.5W+16N  (4)

δ cal value=2.9(Cr+0.3S+Mo+0.5W)−2.6(Ni+0.3Mn+0.25Cu+32C+20N)−18  (5)

wherein the Cr, Mo, W, N, Si, Ni, Mn, Cu, and C indicate contents (percent by mass) of the respective components in the at least one steel material portion, and

Cr equivalent=Cr+Mo+1.5×Si  (6)

Ni equivalent=+0.5×Mn+30×C+30×N  (7)

PI value=Cr+3.3×Mo+16×N  (8)

wherein the Cr, Mo, Si, Ni, Mn, C, and N indicate contents (percent by mass) of the at least one weld metal portion.

7. The austenitic stainless steel welding structure according to claim 3 , wherein the at least one weld metal portion is formed by using at least one of a gas shield arc welding procedure or a tungsten arc welding procedure.

8. An austenitic stainless steel welding structure comprising:

at least one austenitic stainless steel base metal portion containing, about, C: 0.005 through 0.03%, Si: 0.1 through 1.5%, Mn: 0.1 through 3.0%, Ni: 15.0 through 21.0%, Cr: 22.0 through 28.0%, Mo: 1.5 through 3.5%, N, 0.15 through 0.35%, Al: 0.005 through 0.1% to greater than 0% in percent by mass, limiting O to between 0.007% to greater than 0%, limiting P to 0.05% to greater than 0%, and limiting S to between 0.003% to greater than 0%, further containing one, two or more of Cu: 0.1 through 2.0%, Ti: 0.003 through 0.03%, Nb: 0.02 through 0.20%, V: 0.05 through 0.5%, and W: 0.3 through 3.0%, having a PIW value defined by the following equation (4) within a range between about 35 and 40, and a δ cal value defined by the following equation (5) within a range between about −6 and +4, the remainder being iron and unavoidable impurities other than P, O, and S; and

at least one weld metal portion that is formed at a weld zone by using at least one of a gas shield arc welding procedure or a tungsten arc welding procedure, containing, about, C: 0.005 through 0.05%, Si: 0.1 through 1.0%, Mn: 0.1 through 3.5%, Cr: 25.0 through 28.0%, Ni: 16.0 through 23.9%, Mo: 1.6 through 3.0%, Cu: 0.1 through 0.5%, Al: 0.001 through 0.02%, and N: 0.03 through 0.35% in percent by mass, limiting O to between 0.10% to greater than 0%, limiting P to between 0.03% to greater than 0%, and limiting S to between 0.005% to greater than 0%, and having a ratio of a Cr equivalent to Ni equivalent (Cr equivalent/Ni equivalent) within a range between about 0.85 and 1.2 defined by the following equations (6) and (7), having a PI value of about 35 or more defined by the following equation (8), the remainder being iron and unavoidable impurities other than P, O, and S:

PIW value=Cr+3.3(Mo+0.5W)+16N  (4)

δ cal value=2.9(Cr+0.3Si+Mo+0.51W)−2.6(Ni+0.3Mn+0.25Cu+32C+20N)−18  (5)

wherein the Cr, Mo, W, N, Si, Ni, Mn, Cu, and C indicate contents (percent by mass) of the respective components in the at least one steel material portion, and

Cr equivalent=Cr+Mo+1.5×Si  (6)

Ni equivalent=Ni+0.5×Mn+30×C+30×N  (7)

PI value=Cr+3.3×Mo+16×N  (8)

wherein the Cr, Mo, Si, Ni, Mn, C, and N indicate contents (percent by mass) of the at least one weld metal portion.

9. An austenitic stainless steel welding structure comprising:

at least one austenitic stainless steel base metal portion containing, about, C: 0.005 through 0.03%, Si: 0.1 through 1.5%, Mn: 0.1 through 3.0%, Ni: 15.0 through 21.0%, Cr: 22.0 through 28.0%, Mo: 1.5 through 3.5%, N: 0.15 through 0.35%, W: between 3.0% to greater than 0%, Al: 0.005 through 0.1% to greater than 0% in percent by mass, limiting O to between 0.007% to greater than 0%, limiting P to 0.05% to greater than 0%, and limiting S to between 0.003% to greater than 0%, having a PIW value defined by the following equation (4) within a range between about 35 and 40, and a δ cal value defined by the following equation (5) in a range between about −6 and +4, the remainder being iron and unavoidable impurities other than P, O, and S; and

at least one weld metal portion that is formed at a weld zone by using at least one of a gas shield arc welding procedure or a tungsten arc welding procedure, containing, about, C: 0.005 through 0.05%, Si: 0.1 through 1.0%, Mn: 0.1 through 3.5%, Cr: 25.0 through 28.0%, Ni: 16.0 through 23.9%, Mo: 1.6 through 3.0%, Cu: 0.1 through 0.5%, Al: 0.001 through 0.02%, and N: 0.03 through 0.35% in percent by mass, limiting O to between 0.10% to greater than 0%, limiting P to between 0.03% to greater than 0%, and limiting S to between 0.005% to greater than 0%, further containing one, two, or more of Ti: 0.01 through 0.3%, Nb: 0.01 through 0.3%, Ca: 0.0005 through 0.0050%, and Mg: 0.0005 through 0.0050%, having a ratio of a Cr equivalent to Ni equivalent (Cr equivalent/Ni equivalent) within a range between about 0.85 and 1.2 defined by the following equations (6) and (7), and having a PI value of about 35 or more defined by the following equation (8), the remainder being iron and unavoidable impurities other than P, O, and S:

PIW value=Cr+3.3(Mo+0.5W)+16N  (4)

δ cal value=2.9(Cr+0.3Si+Mo+0.5W)−2.6(Ni+0.3Mn+0.25Cu+32C+20N)−18  (5)

wherein the Cr, Mo, W, N, Si, Mn, Cu, and C indicate contents (percent by mass) of the respective components in the at least one steel material portion, and

Cr equivalent=Cr+Mo+1.5×Si  (6)

Ni equivalent=Ni+0.5×Mn+30×C+30×N  (7)

PI value=Cr+3.3×Mo+16×N  (8)

wherein the Cr, Mo, Si, Ni, Mn, C, and N indicate contents (percent by mass) of the at least one weld metal portion.

10. The austenitic stainless steel welding structure according to claim 6 , wherein the at least one weld metal portion is formed by using at least one of a gas shield arc welding procedure or a tungsten arc welding procedure.

11. An austenitic stainless steel welding structure comprising:

at least one austenitic stainless steel base metal portion containing, about, C: 0.005 through 0.03%, Si: 0.1 through 1.5%, Mn: 0.1 through 3.0%, Ni: 15.0 through 21.0%, Cr: 22.0 through 28.0%, Mo: 1.5 through 3.5%, N: 0.15 through 0.35%, W: between 3.0% to greater than 0%, Al: 0.005 through 0.1% to greater than 0% in percent by mass, limiting O to between 0.007% or less (excluding 0%), limiting P to between 0.05% to greater than 0%, and limiting S to between 0.003% to greater than 0%, having a PIW value defined by the following equation (4) within a range between about 35 and 40, and a δ cal value defined by the following equation (5) within a range between about −6 and +4, the remainder being iron and unavoidable impurities other than P, O, and S; and

at least one weld metal portion that is formed at a weld zone by using at least one of a gas shield arc welding procedure or a tungsten arc welding procedure under welding conditions such that a weld heat input Q defined by the following equation (9) is between 20,000 J/cm to greater than 0 and a base metal dilution ratio D defined by the following equation (10) is between 30% to greater than 0%, containing, about, C: 0.005 through 0.05%, Si: 0.1 through 1.0%, Mn: 0.1 through 3.5%, Cr: 25.0 through 28.0%, Ni: 16.0 through 23.9%, Mo: 1.6 through 3.0%, Cu: 0.1 through 0.5%, Al: 0.001 through 0.02%, and N: 0.03 through 0.35% in percent by mass, limiting O to between 0.10% to greater than 0%, limiting P to between 0.03% to greater than 0%, and limiting S to between 0.005% to greater than 0%, having a ratio of a Cr equivalent to Ni equivalent (Cr equivalent/Ni equivalent) within a range between about 0.85 and 1.2 defined by the following equations (6) and (7), and having a PI value of about 35 or more defined by the following equation (8), the remainder being iron and unavoidable impurities other than P, O, and S:

PIW value=Cr+3.3(Mo+0.5W)+16N  (4)

δ cal value=2.9(Cr+0.3Si+Mo+0.5W)−2.6(Ni+0.3Mn+0.25Cu+32C+20N)−18  (5)

wherein the Cr, Mo, W, N, Si, Ni, Mn, Cu, and C indicate contents (percent by mass) of the respective components in the at least one steel material portion, and

Cr equivalent=Cr+Mo+1.5×Si  (6)

Ni equivalent=Ni+0.5×Mn+30×C+30×N  (7)

PI value=Cr+3.3×Mo+16×N  (8)

Q =welding current×welding voltage×welding time/welding length  (9)

D =melting volume of base metal/total weld metal volume  (10)

wherein the Cr, Mo, Si, Ni, Mn, C, and N indicate contents (percent by mass) of the at least one weld metal portion.

12. The austenitic stainless steel welding structure according to claim 8 , wherein the at least one weld metal portion is formed under the welding conditions such that a welding heat input Q defined by the following equation (9) is about between 20,000 J/cm to greater than 0 and a base metal dilution ratio D defined by the following (10) is about between 30% to greater than 0:

Q =welding current×welding voltage×welding time/welding length  (9)

D =melting volume of base metal/total weld metal volume  (10).

13. The austenitic stainless steel welding structure according to claim 9 , wherein the at least one weld metal portion is formed under the welding conditions such that a welding heat input Q defined by the following equation (9) is about between 20,000 J/cm to greater than 0 and a base metal dilution ratio D defined by the following (10) is about between 30% to greater than 0:

Q =welding current×welding voltage×welding time/welding length  (9)

D =melting volume of base metal/total weld metal volume  (10).

14. An austenitic stainless steel welding structure comprising:

at least one austenitic stainless steel base metal portion containing, about, C: 0.005 through 0.03%, Si: 0.1 through 1.5%, Mn: 0.1 through 3.0%, Ni: 15.0 through 21.0%, Cr: 22.0 through 28.0%, Mo: 1.5 through 3.5%, N: 0.15 through 0.35%, Al: 0.005 through 0.1% to greater than 0% in percent by mass, limiting O to between 0.007%, limiting P to between 0.05% to greater than 0%, and limiting S to between 0.003% to greater than 0%, further containing one, two, or more of Cu: 0.1 through 2.0%, Ti: 0.003 through 0.03%, Nb: 0.02 through 0.20%, V: 0.05 through 0.5%, and W: 0.3 through 3.0%, having a PIW value defined by the following equation (4) within a range between about 35 and 40, and a δ cal value defined by the following equation (5) within a range between about −6 and +4, the remainder being iron and unavoidable impurities other than P, O, and S; and

at least one weld metal portion that is formed at a weld zone by using at least one of a gas shield arc welding procedure or a tungsten arc welding procedure under welding conditions such that a weld heat input Q defined by the following equation (9) is about 20,000 J/cm or less (excluding 0) and a base metal dilution ratio D defined by the following equation (10) is about between 30% to greater than 0, containing, about, C: 0.005 through 0.05%, Si: 0.1 through 1.0%, Mn: 0.1 through 3.5%, Cr: 25.0 through 28.0%, Ni: 16.0 through 23.9%, Mo: 1.6 through 3.0%, Cu: 0.1 through 0.5%, Al: 0.001 through 0.02%, and N: 0.03 through 0.35% in percent by mass, limiting O to between 0.10% to greater than 0%, limiting P to between 0.03% to greater than 0%, and limiting S to between 0.005% to greater than 0%, further containing one, two, or more of Ti: 0.01 through 0.3%, Nb: 0.01 through 0.3%, Ca: 0.0005 through 0.0050%, and Mg: 0.0005 through 0.0050%, having a ratio of a Cr equivalent to Ni equivalent (Cr equivalent/Ni equivalent) within a range between about 0.85 and 1.2 defined by the following equations (6) and (7), and having a PI value of about 35 or more defined by the following equation (8), the remainder being iron and unavoidable impurities other than P, O, and S:

PIW value=Cr+3.3(Mo+0.5W)+16N  (4)

δ cal value=2.9(Cr+0.3Si+Mo+0.5W)−2.6(Ni+0.3Mn+0.25Cu+32C+20N)−18  (5)

wherein the Cr, Mo, W, N, Si, Ni, Mn, Cu, and C indicate contents (percent by mass) of the respective components in the at least one steel material portion, and

Cr equivalent=Cr+Mo+1.5×Si  (6)

Ni equivalent=Ni+0.5×Mn+30×C+30×N  (7)

PI value=Cr+3.3×Mo+16×N  (8)

Q =welding current×welding voltage×welding time/welding length  (9)

D =melting volume of base metal/total weld metal volume  (10)

wherein the Cr, Mo, Si, Mn, C, and N indicate contents (percent by mass) of the at least one weld metal portion.

15. An austenitic stainless steel welding structure comprising:

at least one austenitic stainless steel base metal portion containing, about, C: 0.005 through 0.03%, Si: 0.1 through 1.5%, Mn: 0.1 through 3.0%, Ni: 15.0 through 21.0%, Cr: 22.0 through 28.0%, Mo: 1.5 through 3.5%, N: 0.15 through 0.35%, W: between 3.0% to greater than 0%, Al: 0.005 through 0.1% to greater than 0% in percent by mass, limiting O to between 0.007% to greater than 0%, limiting P to between 0.05% to greater than 0%, and limiting S to between 0.003% to greater than 0%, having a PIW value defined by the following equation (4) within a range between about 35 and 40, and a δ cal value defined by the following equation (5) within a range between about −6 and +4, the remainder being iron and unavoidable impurities other than P, O, and S; and

at least one weld metal portion that is formed at a weld zone by using at least one of a gas shield arc welding procedure or a tungsten arc welding procedure and using a pulsed arc procedure under conditions such that a difference between a peak current and a base current is about 20 A or more, a duty ratio defined by the following equation (9) is set to about 0.2 through 0.6, and a frequency is set to about 10 Hz or more, containing, about, C: 0.005 through 0.05%, Si: 0.1 through 1.0%, Mn: 0.1 through 3.5%, Cr: 25.0 through 28.0%, Ni: 16.0 through 23.9%, Mo: 1.6 through 3.0%, Cu: 0.1 through 0.5%, Al: 0.001 through 0.02%, and N: 0.03 through 0.35% in percent by mass, limiting O to between 0.10% to greater than 0%, limiting P to between 0.03% to greater than 0%, and limiting S to between 0.005% to greater than 0%, having a ratio of a Cr equivalent to Ni equivalent (Cr equivalent/Ni equivalent) within a range between about 0.85 and 1.2 defined by the following equations (6) and (7), and having a PI value of about 35 or more defined by the following equation (8), the remainder being iron and unavoidable impurities other than P, O, and S:

PIW value=Cr+3.3(Mo+0.5W)+16N  (4)

δ cal value=2.9(Cr+0.3Si+Mo+0.5W)−2.6(Ni+0.31Mn+0.25Cu+32C+20N)−18  (5)

wherein the Cr, Mo, W, N, Si, Ni, Mn, Cu, and C indicate contents (percent by mass) of the respective components in the at least one steel material portion, and

Cr equivalent=Cr+Mo+1.5×Si  (6)

Ni equivalent=Ni+0.5×Mn+30×C+30×N  (7)

PI value=Cr+3.3×Mo+16×N  (8)

R =peak current period/(peak current period+base current period)  (9)

wherein the Cr, Mo, Si, Ni, Mn, C, and N indicate contents (percent by mass) of the at least one weld metal portion.

16. The austenitic stainless steel welding structure according to claim 8 , wherein the at least one weld metal portion is formed by using pulsed arc under conditions such that a difference between a peak current and a base current is about 20 A or more, a duty ratio R defined by the following equation (10) is set to about 0.2 through 0.6, and a frequency is set to about 10 Hz or more:

R =peak current period/(peak current period+base current period)  (10).

17. The austenitic stainless steel welding structure according to claim 9 , wherein the weld metal is formed by using pulsed arc under conditions such that a difference between a peak current and a base current is 20 A or more, a duty ratio R defined by the following equation (10) is set to about 0.2 through 0.6, and a frequency is set to about 10 Hz or more:

R =peak current period/(peak current period+base current period)  (10).

18. An austenitic stainless steel welding structure comprising:

at least one austenitic stainless steel base metal portion containing, about, C: 0.005 through 0.03%, Si: 0.1 through 1.5%, Mn: 0.1 through 3.0%, Ni: 15.0 through 21.0%, Cr: 22.0 through 28.0%, Mo: 1.5 through 3.5%, N: 0.15 through 0.35%, Al: 0.005 through 0.1% to greater than 0% in percent by mass, limiting O to between 0.007% to greater than 0%, limiting P to between 0.05% to greater than 0%, and limiting S to between 0.003% to greater than 0%, further containing one, two, or more of Cu: 0.1 through 2.0%, Ti: 0.003 through 0.03%, Nb: 0.02 through 0.20%, V: 0.05 through 0.5%, and W: 0.3 through 3.0%, having a PIW value defined by the following equation (4) within a range between about 35 and 40, and a δ cal value defined by the following equation (5) within a range between about −6 and +4, the remainder being iron and unavoidable impurities other than P, O, and S; and

at least one weld metal portion that is formed at a weld zone by using at least one of a gas shield arc welding procedure or a tungsten arc welding procedure and using a pulsed arc procedure under conditions such that a difference between a peak current and a base current is about 20 A or more, a duty ratio R defined by the following equation (9) is set to about 0.2 through 0.6, and a frequency is set to about 10 Hz or more, containing, about, C: 0.005 through 0.05%, Si: 0.1 through 1.0%, Mn: 0.1 through 3.5%, Cr: 25.0 through 28.0%, Ni: 16.0 through 23.9%, Mo: 1.6 through 3.0%, Cu: 0.1 through 0.5%, Al: 0.001 through 0.02%, and N: 0.03 through 0.35% in percent by mass, limiting O to between 0.10% to greater than 0%, limiting P to between 0.03% to greater than 0%, and limiting S to between 0.005% to greater than 0%, further containing one, two, or more of Ti: 0.01 through 0.3%, Nb: 0.01 through 0.3%, Ca: 0.0005 through 0.0050%, and Mg: 0.0005 through 0.0050%, having a ratio of a Cr equivalent to Ni equivalent (Cr equivalent/Ni equivalent) within a range between about 0.85 and 1.2 defined by the following equations (6) and (7), and having a PI value of about 35 or more defined by the following equation (8), the remainder being iron and unavoidable impurities other than P, O, and S:

PIW value=Cr+3.3(Mo+0.5W)+16N  (4)

δ cal value=2.9(Cr+0.3Si+Mo+0.5W)−2.6(Ni+0.3Mn+0.25Cu+32C+20N)−18  (5)

wherein the Cr, Mo, W, N, Si, Mn, Cu, and C indicate contents (percent by mass) of the respective components in the at least one steel material portion, and

Cr equivalent=Cr+Mo+1.5×Si  (6)

Ni equivalent=+0.5×Mn+30×C+30×N  (7)

PI value=Cr+3.3×Mo+16×N  (8)

R =peak current period/(peak current period+base current period)  (9)

wherein the Cr, Mo, Si, Ni, Mn, C, and N indicate contents (percent by mass) of the at least one weld metal portion.

19. The austenitic stainless steel welding structure according to claim 11 , wherein the least one weld metal portion is formed by using a pulsed arc procedure under conditions such that a difference between a peak current and a base current is about 20 A or more, a duty ratio R defined by the following equation (11) is set to about 0.2 through 0.6, and a frequency is set to about 10 Hz or more:

R =peak current period/(peak current period+base current period)  (11).

20. An austenitic stainless steel welding structure comprising:

at least one austenitic stainless steel base metal portion containing, about, C: 0.005 through 0.03%, Si: 0.1 through 1.5%, Mn: 0.1 through 3.0%, Ni: 15.0 through 21.0%, Cr: 22.0 through 28.0%, Mo: 1.5 through 3.5%, N: 0.15 through 0.35%, Al: 0.005 through 0.1% or less to greater than 0% in percent by mass, limiting O to between 0.007% to greater than 0%, limiting P to between 0.05% to greater than 0%, and limiting S to between 0.003% to greater than 0%, further containing one, two, or more of Cu: 0.1 through 2.0%, Ti: 0.003 through 0.03%, Nb: 0.02 through 0.20%, V: 0.05 through 0.5%, and W: 0.3 through 3.0%, having a PIW value defined by the following equation (4) within a range between about 35 and 40, and a δ cal value defined by the following equation (5) within a range between about −6 and +4, the remainder being iron and unavoidable impurities other than P, O, and S; and

at least one weld metal portion that is formed at a weld zone by using at least one of a gas shield arc welding procedure or a tungsten arc welding procedure and using a pulsed arc procedure under welding conditions such that a weld heat input Q defined by the following equation (9) is between about 20,000 J/cm to greater than 0, a base metal dilution ratio D defined by the following equation (10) is between about 30% to greater than 0, a difference between a peak current and a base current is about 20 A or more, a duty ratio R defined by the following equation (11) is set to about 0.2 through 0.6, and a frequency is set to 10 Hz or more, containing, about, C: 0.005 through 0.05%, Si: 0.1 through 1.0%, Mn: 0.1 through 3.5%, Cr: 25.0 through 28.0%, Ni: 16.0 through 23.9%, Mo: 1.6 through 3.0%, Cu: 0.1 through 0.5%, Al: 0.001 through 0.02%, and N: 0.03 through 0.35% in percent by mass, limiting O to between 0.10% to greater than 0%, limiting P to between 0.03% to greater than 0%, and limiting S to between 0.005% to greater than 0%, having a ratio of a Cr equivalent to Ni equivalent (Cr equivalent/Ni equivalent) within a range between 0.85 and 1.2 defined by the following equations (6) and (7), and having a PI value of 35 or more defined by the following equation (8), the remainder being iron and unavoidable impurities other than P, O, and S:

PIW value=Cr+3.3(Mo+0.5W)+16N  (4)

δ cal value=2.9(Cr+0.3Si+Mo+0.5W)−2.6(Ni+0.3Mn+0.25Cu+32C+20N)−18  (5)

wherein the Cr, Mo, W, N, Si, Ni, Mn, Cu, and C indicate contents (percent by mass) of the respective components in the at least one steel material portion, and

Cr equivalent=Cr+Mo+1.5×Si  (6)

Ni equivalent=Ni+0.5×Mn+30×C+30×N  (7)

PI value=Cr+3.3×Mo+16×N  (8)

Q =welding current×welding voltage×welding time/welding length  (9)

D =melting volume of base metal/total weld metal volume  (10)

R =peak current period/(peak current period+base current period)  (11)

wherein the Cr, Mo, Si, Ni, Mn, C, and N indicate contents (percent by mass) of the at least one weld metal portion.

21. An austenitic stainless steel welding structure comprising:

at least one austenitic stainless steel base metal portion containing, about, C: 0.005 through 0.03%, Si: 0.1 through 1.5%, Mn: 0.1 through 3.0%, Ni: 15.0 through 21.0%, Cr: 22.0 through 28.0%, Mo: 1.5 through 3.5%, N: 0.15 through 0.35%, W: 3.0% to greater than 0%, Al: 0.005 through 0.1% or less to greater than 0% in percent by mass, limiting O to between 0.007% to greater than 0%, limiting P to between 0.05% to greater than 0%, and limiting S to between 0.003% to greater than 0%, having a PIW value defined by the following equation (4) within a range between about 35 and 40, and a δ cal value defined by the following equation (5) within a range between about −6 and +4, the remainder being iron and unavoidable impurities other than P, O, and S; and

at least one weld metal portion that is formed at a weld zone by using at least one of a gas shield arc welding procedure or a tungsten arc welding procedure and using a pulsed arc procedure under welding conditions such that a weld heat input Q defined by the following equation (9) is between about 20,000 J/cm to greater than 0, a base metal dilution ratio D defined by the following equation (10) is about 30% (excluding 0), a difference between a peak current and a base current is about 20 A or more, a duty ratio R defined by the following equation (11) is set to about 0.2 through 0.6, and a frequency is set to about 10 Hz or more, containing, about, C: 0.005 through 0.05%, Si: 0.1 through 1.0%, Mn: 0.1 through 3.5%, Cr: 25.0 through 28.0%, Ni: 16.0 through 23.9%, Mo: 1.6 through 3.0%, Cu: 0.1 through 0.5%, Al: 0.001 through 0.02%, and N: 0.03 through 0.35% in percent by mass, limiting O to between about 0.10% to greater than 0%, limiting P to about 0.03% to greater than 0%, and limiting S to between about 0.005% to greater than 0%, further containing one, two, or more of, about, Ti: 0.01 through 0.3%, Nb: 0.01 through 0.3%, Ca: 0.0005 through 0.0050%, and Mg: 0.0005 through 0.0050%, having a ratio of a Cr equivalent to Ni equivalent (Cr equivalent/Ni equivalent) within a range between about 0.85 and 1.2 defined by the following equations (6) and (7), and having a PI value of about 35 or more defined by the following equation (8), the remainder being iron and unavoidable impurities other than P, O, and S:

PIW value=Cr+3.3(Mo+0.5W)+16N  (4)

δ cal value=2.9(Cr+0.3Si+Mo+0.5W)−2.6(Ni+0.3Mn+0.25Cu+32C+20N)−18  (5)

wherein the Cr, Mo, W, N, Si, Ni, Mn, Cu, and C indicate contents (percent by mass) of the respective components in the at least one steel material portion, and

Cr equivalent=Cr+Mo+1.5×Si  (6)

Ni equivalent=Ni+0.5×Mn+30×C+30×N  (7)

PI value=Cr+3.3×Mo+16×N  (8)

Q =welding current×welding voltage×welding time/welding length  (9)

D =melting volume of base metal/total weld metal volume  (10)

R =peak current period/(peak current period+base current period)  (11)

wherein the Cr, Mo, Si, Ni, Mn, C, and N indicate contents (percent by mass) of the at least one weld metal portion.

22. The austenitic stainless steel welding structure according to claim 14 , wherein the at least one weld metal portion is formed by using the pulsed arc procedure under conditions such that a difference between a peak current and a base current is about 20 A or more, a duty ratio R defined by the following equation (11) is set to about 0.2 through 0.6, and a frequency is set to about 10 Hz or more:

R =peak current period/(peak current period+base current period)  (11).