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Abstract
Forming limit diagram of a promising high strength copper alloyed interstitial free steel has been determined by Nakazima tests under various processing conditions. Various parameters such as limiting strain, shear strain and strain ratio have been derived from the diagrams and analysed. The results have been compared with those of two traditional high strength interstitial free steels. It is observed that the formability parameters of copper alloyed interstitial free steel are lower than those of high strength interstitial free steels due to the effect of copper. Copper alloyed interstitial free steel in continuous annealed condition exhibits the highest limiting strain values among all the processing conditions and is comparable to traditional high strength interstitial free steels.