A Constitutive Equation has been determined for a medium strength steel and has been shown to have identical form to the modified Armstrong Zerilli equation used for iron. The strengthening mechanism in steel appears to act through a constant which is subject to thermal softening through the shear modulus but the part of the model describing thermally activated processes remains almost identical to that observed in iron. These observations suggest the possibility of using this equation as a generic form for a wide class of steels in which the determination of coefficients is simplified considerably.
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