| 摘要 |
PROBLEM TO BE SOLVED: To provide a production method by welding of a high-strength oil well steel pipe joint. SOLUTION: The production method includes a high-strength martensitic stainless steel pipe, base metal of which is composed in mass of C of 0.03% or less, Si of 0.70% or less, Mn of 0.30-2.00%, Cr of 10.5-15.0%, Ni of 0.03% or less, O of 0.01% or less and either one or both of Nb of 0.20% or less and/or V of 0.20% or less. The production method further includes a welding filler metal composed in mass of C+N of 0.3% or less, Si of 1.0% or less, Mn of 2.5% or less, Cr of 10.5-24.0%, Ni of 8.0% or less and either one or both of Nb of 0.20% or less and/or V of 0.20% or less. The circumferential edges of the said pipes are welded together by filling the sail filler metal to form a pipe joint. Or welding conditions or the base metal is adjusted so that the filler metal can further contain Mo, Cu, Ti, Zr, B, W, Ca and REM. The base metal can further contain Mo, Cu, Ti, Zr, B, W and Ca.
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