Abstract
The concept of “efficient conditions” of treating steel is introduced. It is shown that, for various structural steels annealed or quenched under efficient conditions, there is an unequivocal relationship between strength and ductility defined by the lines of maximum efficiency A and B on the σv–ψ and SK–σv diagrams (Figs. 2 and 3). An analogous relation can be constructed for steels subjected to thermomechanical treatment, but the paucity of experimental data prevents us from establishing the final shape of the C-line of maximum efficiency over the whole range of ψ. A great deal of published data indicates the effectiveness of thermomechanical treatment in improving the mechanical properties of steels. Empirical relations are given to show the influence of thermal and thermomechanical treatment of steels worked to various ductilities.
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