A 1.5-in-diam cylindrical bar was extruded at room temperature from an 1100-0 (2S-O) aluminum 4.3-in-diam billet. Residual compressive stresses in the longitudinal direction were found to exist on the surface of the extruded bar. These stresses, as determined from the axially relaxed stresses in the billet during extruding, were found to be in qualitative agreement with the experimentally determined residual stresses as found by Sachs’ boring-out method. The severeness of work hardening at the edge of the die, found from the hardness pattern on the sectioned partially extruded billet, was in close agreement with the distribution of natural strains obtained under the same conditions of extrusion.

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