| 摘要 |
Inexpensive, environment-friendly, non-polluting method and apparatus for heat treating steel, utilizing a coolant having a high heat transfer coefficient. The method of heat treating steel, wherein austenized steel is cooled by immersing the same in a coolant, comprising using a mixture of solid particles and water as the coolant, the solid particles being precipitated into the water, the steel being preferably cooled by passing the same through a precipitate layer, the solid particles being preferably oxides or graphite powder and preferably fluidized. The apparatus for heat treating steel, wherein steel is immersed in a coolant vessel, the coolant vessel being provided with a liquid vessel in which water is stored and a solid particle vessel partitioned by mesh in the liquid vessel and charged with solid particles, the mesh being formed so as to have mesh openings smaller than a diameter of the solid particles. The apparatus of another mode for heat treating steel, charged with solid particles and water as coolants, comprising a means for supplying water forcibly among the solid particles, and preferably a solid particle fluidizing means as well.
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