A new mathematical model for hot deformationflow curves is presented .The developed expression can be usedfor austenite or ferrite deformation ,for monotonically increasingflow curves as well as for those with a maximum or withoscillation shape .By experimental determination of 4 flowcurves ,the parameters for the flow curve field can becalculated .Experiments have been carried out using aluminium-killed mild steels in hot compression tests with a range ofdeformation temperature between 700 and 1250°C and of strainrate between 0.1 and 20 s-1 .The accuracy of the new approachand the ability to meet the different flow curve shapes proved to be very good.
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