Martensitic stainless steel material

A martensitic stainless steel material consisting of, in mass %,

• C:
• 0.030% or less,
• Si:
• 1.00% or less,
• Mn:
• 1.00% or less,
• P:
• 0.030% or less,
• S:
• 0.0050% or less,
• Cr:
• 11.00 to 14.00%,
• Ni:
• 4.00 to 7.50%,
• Mo:
• 1.50 to 4.50%,
• Co:
• 0.01 to 0.50%,
• Ti:
• 0.05 to 0.30%,
• V:
• 0.01 to 1.00%,
• Ca:
• 0.0005 to 0.0050%,
• Mg:
• 0.0005 to 0.0050%,
• Al:
• 0.001 to 0.100%,
• N:
• 0.0500% or less,
• O:
• 0.0500% or less,
• Cu:
• 0 to 3.50%,
• Nb:
• 0 to 0.50%,
• Zr:
• 0 to 0.050%,
• W:
• 0 to 2.00%,
• B:
• 0 to 0.0050%,
• rare earth metal:
• 0 to 0.0050%, and
• the balance:
• Fe and impurities,
• wherein:
• within ranges of contents of elements of the martensitic stainless steel material, contents of the elements satisfy Formula (1);
• a yield strength is 862 MPa or more;
• and
• in the martensitic stainless steel material,
• a number ratio of Mg oxides having an equivalent circular diameter of 2.0 μm or more with respect to Ca oxides having an equivalent circular diameter of 2.0 μm or more, Ca sulfides having an equivalent circular diameter of 2.0 μm or more, and the Mg oxides having an equivalent circular diameter of 2.0 μm or more is 45.0% or more;
• 0.001
• ≤
• Ca
• +
• Mg
• ≤
• 0.005
• (
• 1
• )
• where, a content of a corresponding element in percent by mass is substituted for each symbol of an element in Formula (1).