Welded joint

A welded joint comprising:

• a base material having a chemical composition of, in mass %:
• C:
• 0.03 to 0.075%;
• Si:
• 0.6 to 2.0%;
• Mn:
• 0.05 to 2.5%;
• P:
• up to 0.04%;
• S:
• up to 0.015%;
• Cr:
• more than 16.0% and less than 23.0%;
• Ni:
• not less than 20.0% and less than 30.0%;
• Cu:
• 0.5 to 10.0%;
• Mo:
• less than 1%;
• Al:
• up to 0.15%;
• N:
• 0.005 to 0.20%;
• O:
• up to 0.02%;
• Ca:
• 0 to 0.1%;
• REM:
• 0 to 0.15%;
• V:
• not less than 0% and less than 0.5%;
• and
• Nb:
• 0 to 2%,
• a balance being Fe and impurities;
• and
• a first-layer weld metal having a chemical composition of, in mass %:
• C:
• 0.01 to 0.15%;
• Si:
• 0.01 to 4.0%;
• Mn:
• 0.05 to 3.0%;
• P:
• up to 0.03%;
• S:
• up to 0.015%;
• Cr:
• more than 16.0% and less than 32.0%;
• Ni:
• not less than 20.0%;
• Cu:
• 0.03 to 5.0%;
• Al:
• up to 1.0%;
• N:
• 0.005 to 0.2%;
• O:
• up to 0.02%;
• Ti:
• 0 to 0.5%;
• Mo:
• 0 to 8%;
• Nb:
• 0 to 3%;
• Co:
• 0 to 15%;
• and
• Fe:
• 10 to 40%,
• a balance being impurities.

A method of manufacturing a welded joint, comprising the steps of:

• preparing a base material having a chemical composition of, in mass %:
• C:
• 0.03 to 0.075%;
• Si:
• 0.6 to 2.0%;
• Mn:
• 0.05 to 2.5%;
• P:
• up to 0.04%;
• S:
• up to 0.015%;
• Cr:
• more than 16.0% and less than 23.0%;
• Ni:
• not less than 20.0% and less than 30.0%;
• Cu:
• 0.5 to 10.0%;
• Mo:
• less than 1%;
• Al:
• up to 0.15%;
• N:
• 0.005 to 0.20%;
• O:
• up to 0.02%;
• Ca:
• 0 to 0.1%;
• REM:
• 0 to 0.15%;
• V:
• not less than 0% and less than 0.5%;
• and
• Nb:
• 0 to 2%,
• a balance being Fe and impurities;
• and
• welding the base material using a welding material having a chemical composition including, in mass %, Cr:
• 15.0 to 35.0%;
• and Ni:
• 40.0 to 70.0%,
• wherein the welded joint includes a first-layer weld metal having a chemical composition including, in mass %, an Fe content ranging from 10 to 40%.