PROCESS FOR PRODUCING METASTABLE AUSTENITIC STAINLESS STEEL STRIP EXCELLING IN FATIGUE PROPERTY AND THE STEEL STRIP

摘要

A metastable austenitic stainless steel strip excelling in fatigue property that finds appropriate application in parts requiring repeated resilience, such as parts for use in switch portions of various electronic equipments, finding especially appropriate application in metal dome parts for switch. There is provided a process for producing a metastable austenitic stainless steel strip of 1200 MPa or greater tensile strength excelling in fatigue property, comprising performing a final cold rolling of material with an average crystal grain diameter of 5.0 mum or less so as to attain a martensite content in product thickness of 90% or below. Preferably, there is provided a process comprising sequentially performing cold rolling of material with an average crystal grain diameter of 5.0 mum or less, recrystallization-annealing aiming at an average crystal grain diameter of 5.0 mum or less and final cold rolling. Further, there are provided a metastable austenitic stainless steel strip obtained by these processes and a metal dome part for switch consisting of the stainless steel strip.