鉄鋼の浸燐および浸燐浸炭について

概要

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Phosphorizing of steels was studied by utilizing the treatment in ferro-phosphorous grains or in molten salts containing NaPO_3 at various temperatures. Some properties of phosphorized steels were also examined. The results were summarized as follows : 1. When steels were treated in ferro-phosphorous grains containing several percent of charcoal at about 1000℃, the phosphorized layer was uniform and smooth. In molten salts containing NaPO_3, the specimen of steel was corroded and the phosphorized layer was porous. However, if the molten salts containing not only NaPO_3 but also several percent of NaCN, a uniform phosphorized layer was obtained. 2. The phosphorized steel was rapidly attacked by chemical corrosion in acidic solutions, but showed excellent resistant to weathering. 3. Phospho-carburizing in molten salts containing NaPO_3 and about 15% of NaCN was studied. Martensite in phospho-carburized and quenched specimens was harder than iron-carbon martensite in usual carburized steel. The hardness of P-C martensite reached to about Hv 1000.
社団法人日本鉄鋼協会の論文
1970-08-01