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    • 8. 发明公开
    • A process for case hardening steel
    • Verfahren zumEinsatzhärtenvon Stahl。
    • EP0059803A1
    • 1982-09-15
    • EP81300922.2
    • 1981-03-05
    • Kolene Corporation
    • Jakubowski, Thomas MichaelWood, William George
    • C23C8/44C23C8/48C23C8/54
    • C23C8/56C23C8/46C23C8/50
    • A process for case hardening steel is described. A fused bath of inert salt is provided which is comprised of alkali halides, alkali earth halides, or mixtures thereof, and alkali oxides, alkaline earth oxides, alkali carbonates, alkaline earth carbonates, or mixtures thereof. There is added to this fused bath, after suspending the steel therein, urea, dicyanodiamide, pyrolysis/condensation products of urea or dicyanodiamide, or combinations thereof. This will form active ions containing carbon and/or nitrogen, and either the nitrogen and/or carbon will diffuse into the surface of a steel piece suspended in the bath to form either a nitrided, carbonitrided or carburized case depending upon the temperature of the bath, which is selectively maintained between above 540°C. and about 950°C.
    • 描述了表面硬化钢的方法。 提供惰性盐的熔融浴,其由碱金属卤化物,碱土金属卤化物或其混合物,碱金属氧化物,碱土金属氧化物,碱金属碳酸盐,碱土金属碳酸盐或其混合物组成。 在该熔融浴中,在其中悬浮钢,尿素,二氰基二酰胺,尿素或二氰基二酰胺的热解/缩合产物或其组合之后加入。 这将形成含有碳和/或氮的活性离子,并且氮和/或碳将扩散到悬浮在浴中的钢片的表面,以形成氮化,碳氮共渗或渗碳的情况,这取决于浴的温度 ,其选择性地保持在540℃和约950℃之间。