An investigation into the mechanical properties of super duplex stainless steel at the elevated temperatures expected during induction bending

Super duplex stainless steel is becoming increasingly popular for the manufacture of pressure vessels, conduits and valves used for the transport, storage and control of corrosive fluids. As a result it is the subject of many hot forming processes such as induction bending. This paper explores the effect of the very high temperatures experienced during these forming processes on the mechanical properties of super duplex stainless steel. The authors establish that, over the range of temperatures considered, there is a linear relationship between 0.2% proof stress and temperature, limit of proportionality and temperature, ultimate tensile stress and temperature, and Young's Modulus and temperature. in addition the authors establish that there is a linear relationship between strain rate and 0.2% proof stress at elevated temperatures. Finally the authors suggest that it is possible to estimate the temperature at which the material looses all of its residual elastic behaviour by calculating the point of intersection for lines tying 0.2% proof stress to temperature, 0.1% proof stress to temperature and limit of proportionality to temperature. © 2007 Science Reviews.