High-strength stainless steel pipe

A high-strength stainless steel pipe, wherein, as a base material, a stainless steel material which contains on the basis of percent by mass, C from 0.04 to 0.12%, Ni from 0 to 5.0%, Cr from 12.0 to 17.0%, N at 0.022% or less, Si from 0.2 to 2.0%, Mn at 2.0% or less, Cu from 0 to 2.0%, P at 0.06% or less, S at 0.006% or less, with residue being Fe and unavoidable impurities, and in which a parent phase is constituted with any one of a single phase structure of ferrite phase, and a diploid phase structure of ferrite phase and martensite phase, in which carbide is uniformly separated at grain boundaries and within grains, and which is 0.03% or less in a dissolved amount of C, is used,

• the high-strength stainless steel pipe includes a joint in which a molten structure resulting from melt-welded is formed, and
• the parent phase and the joint after heat treatment are those in which separated carbide is dissolved, and are a diploid phase structure including martensite phase and 10% or more and 25% or less by volume of ferrite phase.