Abstract
The steel wire (C\doteqdot0.6%, Mn\doteqdot0.8%, 0.31 mm dia) was continuously quenched and tempered by resistance heating and Martemper method and the conditions of heat treatment were variously changed. In these cases the tensile strength, elastic, limit, resiliency and number of bending were measured. The results obtained are as follows:
(1) The elastic properties of cold drawn wire were remarkably raised by quenching and tempering regardless of the tensile srtength. (2) The quenching temperature at which all properties showed the maximum values was higher in the continuous quenching than in the ordinary quenching. (3) The heating time for the quenching scarcely had any influence on all properties but it had influence on the quenching temperature at which the maximum values of all properties were obtained. (4) The temperature of the metal bath and dipping time in it scarcely had any influence on all properties, if the wire were sufficiently cooled before it was introdused into the tempering bath. (5) The cooling rate between the metal bath and the tempering bath scarcely had any influence on all properties as long as the wire was sufficiently cooled. (6) The tempering temperature had great influence but its time scarcely had any influence on all properties.
