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Abstract

A method for producing a two-phase stainless steel pipe, which comprises:

preparing a two-phase stainless steel material consisting of, by mass %, C: 0.03% or less, Si: 1% or less, Mn: 0.1 to 2%, Cr: 20 to 35%, Ni: 3 to 10%, Mo: 0 to 4%, W: 0.5 to 6%, Cu: 0 to 3% and N: more than 0.175 and up to 0.35%, and the balance being Fe and impurities;forming a material pipe by subjecting to a hot working: andperforming a cold drawing, where the cold drawing is characterized in being performed under the conditions that the working ratio Rd, in terms of the reduction of area, in the final cold drawing step is within a range from 5 to 35%, and the following formula (1) is satisfied:Rd(%)≧(MYS−55)/17.2−{1.2×Cr+3.0×(Mo+0.5×W)}  (1).

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First Claim