Abstract: Two types of mathematical models for hot forming stress-strain curve in metal are analysed in this paper. Through a detailed investigation on hot forming processing, a new model for true stress-strain curve, quite suitable for engingeering application, is put forward:σ=Aε^aε^bexp[-(cT+dε)], It provides a useful referential foundation for realizing the controlled forging technology in steel.

Key words: stress-strain curve, controlled forging technology, thermal/mechanicalsimulation