Experimental investigation of mechanical properties and stress-strain model of ferritic stainless steel (410L) rebars

Stainless steel (SS) rebars have gained substantial traction in the construction industry due to their superior corrosion resistance. Among SS rebars, such as austenitic SS and duplex SS, ferritic SS, which has lower chromium and nickel content, presents a cost-effective alternative. This study delves into the stress-strain models applicable to ferritic SS (grade 410L) ribbed reinforcing bars, analyzing their mechanical properties and ductility parameters in comparison to conventional carbon steel (Fe 500SD) rebars. Tensile tests were conducted on various diameters of ferritic SS (8 mm, 10 mm, 12 mm, and 16 mm) alongside carbon steel (CS) rebars, facilitating a comparative analysis of their mechanical properties and ductility. The results revealed higher yield stress and ultimate strength in ferritic SS rebars, characterized by significant strain hardening but lower ductility parameter values compared to CS. Furthermore, the study assessed the applicability of existing stress-strain models—specifically, the Rasmussen and I. Arrayago models—in predicting the behaviour of ferritic SS rebars. While both models reasonably estimated the first-stage strain hardening parameter (n), they underpredicted the second-stage strain hardening parameter (m) based on the obtained test results.