Mechanical Properties of 202 Austenitic Stainless Steel Depending on Rolling Temperature and Rolling Degree

In this study, high-cost Cr and Ni components of 202 austenitic stainless steel were reduced, low-cost Mn was added, and the amount of martensite and the mechanical properties were evaluated according to the rolling temperature and rolling degree. Part of the austenite was deformed by rolling into α′-martensite. As the rolling degree was increased, more martensite was generated; and at the same rolling degree, as the rolling temperature decreased, more martensite was generated. Up to a rolling degree of 33 %, the amount of martensite rapidly increased; thereafter, it gradually increased. In particular, the amount of martensite at a rolling temperature of-196 °C was similar to that after the rolling degree of 33 %. As the rolling temperature decreased and the rolling degree increased, both the Vickers hardness and tensile (yield) strength increased, while the elongation rapidly decreased.