Stainless steel wire and its manufacturing method, spring parts, and wire rod for stainless steel wire

摘要

PROBLEM TO BE SOLVED: To provide a high-strength stainless steel wire having excellent stress relaxation resistance and stress corrosion cracking resistance and a method for manufacturing the same. SOLUTION: In mass%, Ni: 8.0 to 15.0%, Cr: 12.0 to 25.0%, Mo: 0.1 to 4.0%, N: 0.10 to 0.30. %, The A value represented by the formula (a) is −200 to −100, and the work-induced martensite phase is 10.0 vol. It has a metal structure of less than% and a metal structure containing an austenite phase, the austenite phase of the steel wire has a dislocation density of 0.5 × 10 15 / m 2 or more, and the austenite at a position 200 μm from the surface layer of the steel wire. A stainless steel wire having a crystal orientation RD // fraction in the rolling direction of the phase of 0.90 or less. A value = 551-462 (C + N) -9.2Si-8.1Mn-29Ni-13.7Cr-18.5Mo ... (a) [Selection diagram] None