Martensitic stainless steel seamless pipe for oil country tubular goods, and method for manufacturing same

A martensitic stainless steel seamless pipe for oil country tubular goods having a yield stress of 758 MPa or more, the martensitic stainless steel seamless pipe having a composition that comprises, in mass %, C:

• 0.0010 to 0.0094%, Si:
• 0.5% or less, Mn:
• 0.05 to 0.5%, P:
• 0.030% or less, S:
• 0.005% or less, Ni:
• 4.6 to 7.3%, Cr:
• 10.0 to 14.5%, Mo:
• 1.0 to 2.7%, Al:
• 0.1% or less, V:
• 0.2% or less, N:
• 0.1% or less, Ti:
• 0.01 to 0.50%, Cu:
• 0.01 to 1.0%, and Co:
• 0.01 to 1.0%, in which the values of the following formulae (1) and (2) satisfy the formulae (3) below, and the balance is Fe and incidental impurities:
• −109.37C+7.307Mn+6.399Cr+6.329Cu+11.343Ni−13.529Mo+1.276W+2.925Nb+196.775N−2.621Ti−120.307, Formula (1)
• −1.324C+0,0533Mn+0.0268Cr+0.0893Cu+0.00526Ni+0.0222Mo−0.0132W−0.473N−0.5Ti−0.514, Formula (2)
• wherein C, Mn, Cr, Cu, Ni, Mo, W, Nb, N, and Ti represent the content of each element in mass %, and the content is 0 (zero) for elements that are not contained,
• −35.0≤value of formula (1)≤45, and
• −0.40≤value of formula (2)≤0.070. Formulae (3)