Welded joint and method of manufacturing welded joint

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

• preparing a base material having a chemical composition of, in mass %:
• C:
• 0.005 to 0.1%;
• Si:
• up to 1.2%;
• Mn:
• 2.5 to 6.5%;
• Ni:
• 8 to 15%;
• Cr:
• 19 to 25%;
• Mo:
• 0.01 to 4.5%;
• V:
• 0.01 to 0.5%;
• Nb:
• 0.01 to 0.5%;
• Al:
• less than 0.05%;
• N:
• 0.15 to 0.45%;
• O:
• up to 0.02%;
• P:
• up to 0.05%;
• and
• S:
• up to 0.04%, and
• a balance being iron and impurities,
• preparing a welding material having a chemical composition of, in mass %:
• C:
• 0.005 to 0.1%;
• Si:
• up to 0.7%;
• Mn:
• 0.5 to 3%;
• Ni:
• 8 to 23%;
• Cr:
• 17 to 25%;
• Mo:
• 0.01 to 4%;
• V:
• 0 to 0.5%;
• Nb:
• 0 to 0.5%;
• Al:
• less than 0.05%;
• N:
• less than 0.15%;
• O:
• up to 0.02%;
• P:
• up to 0.03%;
• and
• S:
• up to 0.02%, and
• a balance being iron and impurities, and
• welding the base material using the welding material,
• wherein the chemical composition of the base material satisfies Equation (1), and
• the chemical composition of the welding material satisfies Equations (1) and (2),
• Ni+0.65Cr+0.98Mo+1.05Mn+0.35Si−12.6C≧29 (1), and
• 0.31C+0.048Si−0.02Mn−0.056Cr+0.007Ni−0.013Mo≦−1.0 (2),
• where the contents of elements (in mass %) are substituted for the symbols of these elements in Equations (1) and (2).