Abstract: The method of manufacturing coiled springs comprising forming steel rod by hot rolling, oil-tempering the rod as produced in the hot rolling operation, without drawing it, by passing it through an austenitizing step, an oil quenching step and a tempering step, cold-drawing the resultant oil-tempered rod into wire, and winding springs from the wire.
Abstract: The method of manufacturing coiled springs from hot-rolled steel rod (as distinguished from drawn wire) wherein round steel rod is formed by hot rolling with the gauge of the rod within a tolerance of .+-.0.010 inch and the rod not out of round more than a maximum of 0.015 inch, oil tempering the rod as produced in the hot rolling operation, without drawing it, by passing it through an austenitizing step, an oil quenching step and a tempering step, and winding springs from the oil tempered rod.