Welding material and welded joint structure

A welded joint structure which is constructed with base metals each made of an austenitic alloy comprising, by mass percent, C:

• not more than 2.0%, Si:
• not more than 4.0%, Mn:
• 0.01 to 3.0%, P:
• more than 0.03% to not more than 0.3%, 5:
• not more than 0.03%, Cr:
• 12 to 35%, Ni:
• 6 to 80%, sol. Al:
• 0.001 to 5% and N:
• not more than 0.3%, with the balance being Fe and impurities, and a weld metal made of an austenitic alloy having the following characteristics (i) and GO:
• (i) the chemical composition of at least the primary layer being welded from one side, comprises, by mass percent, C:
• more than 0.1% to not more than 0.7%, Si:
• not more than 4.0%, Mn:
• not more than 3.0%, P:
• more than 0.03% to not more than 0.1%, S:
• not more than 0.03%, Cr:
• 18 to 30%, Ni:
• more than 10% to not more than 70%, sol. Al:
• 0.001 to 1% and N:
• not more than 0.3%, with the balance being Fe and impurities;
• and
• (ii) the penetration bead has a height of 0 to 3 mm.

A welded joint structure resulting from welding of a base metal made of an austenitic alloy having the following “chemical composition 1” to a base metal made of another austenitic alloy, on the occasion of welding, a welding material which comprises, by mass percent, C:

• more than 0.6% to not more than 2.0%, Si:
• not more than 4.0%, Mn:
• not more than 3.0%, P:
• not more than 0.03%, S:
• not more than 0.03%, Cr:
• more than 22% to not more than 35%, Ni:
• more than 30% to not more than 70%, sol. Al:
• 0.001 to 1% and N:
• not more than 0.3%, with the balance being Fe and impurities, is used in the primary pass of the multi-layer welding and a welding material which comprises, by mass percent, C:
• more than 0.2% to not more than 0.6%, Si:
• not more than 4.0%, Mn:
• not more than 3.0%, P:
• not more than 0.03%, S:
• not more than 0.03%, Cr:
• more than 22% to not more than 35%, Ni:
• more than 30% to not more than 70%, sol. Al:
• 0.001 to 1% and N:
• not more than 0.3%, with the balance being Fe and impurities, is used in the subsequent build-up passes of the said multi-layer welding:
• “Chemical composition 1”:
• a chemical composition which comprises, by mass percent, C:
• not more than 2.0%, Si:
• not more than 4.0%, Mn:
• 0.01 to 3.0%, P:
• more than 0.03% to not more than 0.3%, S:
• not more than 0.03%, Cr:
• 12 to 35%, Ni:
• 6 to 80%, sol. Al:
• 0.001 to 5% and N:
• not more than 0.3%, with the balance being Fe and impurities.

A welded joint structure resulting from welding of a base metal made of an austenitic alloy having the following “chemical composition 1” to a base metal made of another austenitic alloy, on the occasion of welding, using a welding material which comprises by mass percent, C:

• more than 0.2% to not more than 0.6%, Si:
• not more than 4.0%, Mn:
• not more than 3.0%, P:
• not more than 0.03%, S:
• not more than 0.03%, Cr:
• more than 22% to not more than 35%, Ni:
• more than 30% to not more than 70%, sol. Al:
• 0.001 to 1% and N:
• not more than 0.3%, with the balance being Fe and impurities, at least the welding of the primary layer is carried out under a condition such that the ratio of dilution from the base metals becomes less than 50%:
• “Chemical composition 1”:
• a chemical composition which comprises, by mass percent, C:
• not more than 2.0%, Si:
• not more than 4.0%, Mn:
• 0.01 to 3.0%, P:
• more than 0.03% to not more than 0.3%, S:
• not more than 0.03%, Cr:
• 12 to 35%, Ni:
• 6 to 80%, sol. Al:
• 0.001 to 5% and N:
• not more than 0.3%, with the balance being Fe and impurities.