| 摘要 |
A high-strength stainless steel pipe which is excellent in strength and corrosion resistance and which can be produced at low cost is provided. As a base material, there is provided a stainless steel material having compositions which contain on the basis of percent by mass, C from 0.04 to 0. 12%, Ni from 0 (including a case of no addition) to 5.0%, Cr from 12.0 to 17.0%, N from 0 (including a case of no addition) to 0.10%, Si from 0.2 to 2.0%, Mn at 2.0% or less, Cu from 0 (including a case of no addition) to 2.0%, P at 0.06% or less, S at 0.006% or less, with residue being Fe and unavoidable impurities. Further, a parent phase is constituted with any one of a single phase structure of ferrite phase or martensite phase and a diploid phase structure of ferrite phase and martensite phase. An end of the base material is melt-welded as a joint to form a pipe. The parent phase is provided with carbide uniformly separated at grain boundaries and within grains, with a dissolved amount of C being 0.03% by mass or less. |
