Method for producing metastable austenitic stainless steel strip with excellent fatigue properties and steel strip

摘要

Provided is a metastable austenitic stainless steel strip excellent in fatigue characteristics, which is suitable for a part that requires repeated springiness, such as a part used in a switch part of various electronic devices, and suitable for a metal dome part for a switch. A metastable austenitic stainless steel strip excellent in fatigue properties with a tensile strength of 1200 MPa or more, which is obtained by final cold rolling a material having an average grain size of 5.0 μm or less and having a martensite content of 90% or less in the product thickness. Preferably, the material having an average crystal grain size of 5.0 μm or less is cold-rolled, and after the recrystallization annealing so that the average crystal grain size is 5.0 μm or less, the final cold rolling is performed Method, metastable austenitic stainless steel strip obtained by the method, and metal dome part for switch comprising the stainless steel strip.