STAINLESS STEEL AND MATERIAL TREATMENT METHOD

摘要

PROBLEM TO BE SOLVED: To improve the mechanical properties and corrosion resistance of stainless steel and also to reduce its residual stress.SOLUTION: In Fe based stainless steel containing Cr by 15% or more, modulated compositions in which a layered Fe-rich phase and a layered Cr-rich phase are mutually formed are at a plurality of parts along at least a part of the boundaries of the crystal grains of α phases. The material treatment method comprises: a heating step where a rolled stainless steel is heated, and its temperature is increased to a temperature of the Curie point of the stainless steel; a cooling step where the stainless steel is cooled from the temperature less than the Curie point; and a magnetic field application step where magnetic fields are applied to the rolling direction of the stainless steel over the range between the temperature less than the Curie point from the prescribed temperature in the heating step and the other prescribed temperature from the Curie point or lower in the cooling step.SELECTED DRAWING: Figure 8