Stress-Strain Model for Ferritic Stainless Steels (No. R953)

Abstract

Compared with austenitic or duplex stainless steels, ferritic stainless steels have no or very low nickel content. Therefore, their cost is lower and more stable than those of austenitic and duplex stainless steels, providing a more viable alternative for structural applications. Existing stress−strain models, however, are less accurate in predicting stress−strain curves of ferritic stainless steels than for austenitic and duplex stainless steels, since ferritic stainless steels behave more similarly to plain carbon steel. A wide range of tensile test data were collected for ferritic stainless steel coupons, either cut from steel sheets or cold-formed hollow sections. Using the three basic Ramberg-Osgood parameters, stress−strain models are developed for both flat and corner ferritic stainless steels. The accuracy of the proposed models is verified by comparing their predictions with experimental stress−strain curves.