| 摘要 |
PURPOSE:To enhance strength and wire drawing processability, by applying control cooling to a high temp. steel wire material by using an air-water mixing phase fluid containing a large amount of oxidative air bubbles in a strongly agitated state and held to a predetermined temp. CONSTITUTION:The cooling medium 5 in a heat treatment tank 4 is held at 95 deg.C or less and a large amount of oxidative air bubbles 6 are contained in said cooling medium 5 to form an air-water mixing phase fluid under a strongly agitated state. A ring shaped coil comprising a high temp. steel wire material, of which the metal structure shows austenite, is continuously transferred through the cooling medium 5 under this state in a horizontally developed state to perform control cooling. By this method, the strength and wire drawing processability are enhanced. |
