Austenitic stainless steel welding wire and welding structure

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.