Stainless steel sheet for a gasket and a method for its manufacture

摘要

A high-performance stainless steel sheet which has a high strength which is optimal for a gasket for use in high-performance engines of automobiles and motorcycles and which also has excellent workability and fatigue properties and a method for its manufacture are provided. At least in a region from the surface of the sheet up to 3 mum in the thickness direction, nitrogen compounds of at least 10 nm and at most 200 nm are present in an amount of at least 200 per 100 mum². The number of nitrogen compounds of at least 10 nm and at most 200 nm in a region from the sheet surface up to 3 mum in the thickness direction of the sheet is at least 2 times the number of nitrogen compounds of this size in the central portion of the sheet thickness.