Abstract
The effects of aging and stress-aging (called hot stretching) at the temperatures from 120°C to 700°C on the mechanical properties, relaxation values, Charpy impact values and SCC behavior of hard drawn SUS 304, SUS 316 stainless steel wires have been studied.The main results obtained are as follows:(1) Yield and tensile strength of the wires increased by aging at 230°C and 530°C as well as by hot stretching. The strengthening after 230°C treatment may be due to the strain aging by C and the increase of strength after 530°C treatment results from precipitation of Cr23C6 on dislocations.(2) Stress relaxation values up to 250°C are low due to precipitation of Cr23C6. Almost no difference can be observed between aging and hot stretching.(3) Impact value at -96°C of SUS 304 stainless steel wire which was measured with 1 mm V-notched specimen was found to be about the same as that of 9% Ni steel.(4) It is considered that in comparison with high carbon PC wire SUS 304 stainless steel showing high tensile strength is insensitive to SCC in NH4SCN and NH4NO3 solutions.(5) In practice, tension member of the austenitic stainless steel wire and strand which were produced by aging at 500°C may be useful in special industrial field, for example, (a) SUS 304, in cryogenic field use (b) SUS 316, in intensive magnetic field use as a nonmagnetic material.
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