Stainless steel pipe and method for manufacturing the same

A stainless steel pipe having

• a chemical composition comprising, by mass %,
• C:
• 0.05% or less,
• Si:
• 1.0% or less,
• Mn:
• 0.10% to 2.0%,
• P:
• 0.05% or less,
• S:
• less than 0.005%,
• Cr:
• 16.0% (not inclusive) to 20.0%,
• Mo:
• 0.6% (not inclusive) to 1.4% (not inclusive),
• Ni:
• 3.0% to 5.0% (not inclusive),
• Al:
• 0.001% to 0.10%,
• N:
• 0.010% to 0.100%,
• O:
• 0.01% or less,
• Cu:
• 0.3% to 3.5%, and
• a balance of Fe and incidental impurities, in which relational expression (1) and relational expression (2) are satisfied,
• a microstructure including, in terms of volume fraction, 45% or more of a tempered martensitic phase, 20% to 40% of a ferrite phase, and 5% to 25% of a retained austenite phase,
• a yield strength of 758 MPa or higher, and
• an absorbed energy at a temperature of −10° C. vE−10 of 40 J or more:
• Cr+0.65×Ni+0.6×(Mo+0.5×W)+0.55×Cu−20×C≥21.7 (1),
• Cr+3.3×(Mo+0.5×W)−17×C≥21.0 (2),
• where, in both relational expressions, each of Cr, Ni, Mo, W, Cu, and C denotes the content (mass %) of the corresponding element and is assigned a value of zero when the corresponding element is not added.