シェルモールド鋳鋼品の表面浸炭防止法に関する研究

概要

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Those castings produced by “shell molding process” are being widely used because of remarkable dimensional accuracy and also smoothness of the surface. The binder, however, consists of carbon monoxide and hydrocarbons and it causes “carbon pickup” on the steel surface during the casting operation. The carburization effect is more pronounced in low stainless steel grades. Therefore, a research was made to settle the problem and the results ware as per written hereunder.(1) The surface carbon pickup of stainless steel castings can be avoided by mixing those oxides like NiO, Fe2O3 etc. into the shell mold.(2) In order to protect the castings from the surface carbon pickup it was found that the addition of NiO and Fe2O3 as much as adout 5 and 10% respectively is effective.(3) The cold deflection strength of shell mold is satisfactory in case of NiO, but the said strength gets remarkably lowered in case of Fe2O3 and therefore, it is hard to put it into practical application.
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