Abstract
Variation of mechanical properties due to cold drawing and subsequent annealing was studied. The materials used in this investigation were three kinds of austenitic stainless steels, containing about 10% nickel and 0.03, 0.06, 0.08% carbon respectively. The following conclusions may be drawn from the experimental results. (1) The following empirical equations describe the relationships among the Vickers hardness (Hv), the tensile strength (σB·kg/mm2) and the yield point (0.2% set) (σy0.2·kg/mm2).
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(2) The proportional limit of cold drawn wires is very low in spite of their high Hv and σB,and independent of both the degree of cold drawing ranging from 20 to 90% reduction of area and the carbon content ranging from 0.03 to 0.08% in weight. (3) Annealing after cold drawing is very effective for increasing the proportional limit. For example, the proportional limit is about 15 kg/mm2 when they are cold drawn, and about 50 kg/mm2 when they are annealed for 1/2 hr at 400° after cold drawing. The proportional limit of stainless steel wire,cold drawn and subsequently annealed,is also independent of both the degree of cold drawing ranging from 20 to 90% reduction of area and the carbon content ranging from 0.03 to 0.08% in weight.
