熔鐵の流動性に關する研究 (I)
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概要
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Research on the fluidity or the viscosity of the molten iron is important for the purpose of iron smelting or foundry practice. These measurements are, however, difficult, because they must be carried out at high temperatures. In these studies the flowing property was measured by the weight which flowed out through the capillary (2.3mm diameter, 15mm length) at the constant pressure of the molten iron. These capillaries were made of pure magnesia. The capacity of the flowability were determinred by the time required to let flow out a unit weigbt of mercury through this capillary at the constant pressure and temperature. The effect of temperature, composition and degree of deoxidation of the molten iron were observed by various specimens which was melted in a high frequency furnace. The following results were obtained. Here the time required to let flow out 0.3kg molten pig iron through the capillary was indicated by Z, that was nearly the reciprocal of the fluidity. (1) The Z-T (temperature of the sample) relations of commonly used pigs were plotted in a almost linear relation and the inclination of curves were nearly similar. In general, the larger the percentage of [C]+[Si] was and the higher the temperature is, so the smaller the value of Z became, when other compositions of pigs were nearly equal. But some specimens show the other different properties. The values of Z were about 7.5∿9.5. (2) When 0.7kg Al per 100kg pig was added to the molten pig before sampling, the value of Z increased to 13∿15 from about 8. By addition of 2.0kg ferro-silicon per 100kg pig, also the value of Z somewhat increased. When 0.5kg Fe_2O_3 per 100kg pig was added before sampling, conversely the value of Z decreased a little. (3) When the percentage of [C]+[Si] in the molten pig was successively decreased to 4.3 from 5.3 by addition of steel scrap to the pig which was aelted in the furnace, the value of Z at each flowing test was decreased a little. This fact was opposite to the result of (1), but coincided with the result of (2) (4) When the content of sulphur increased to 0.38% from 0.07% by addition of FeS to the molten pig iron, the value of Z increased only about 0.3.
- 社団法人日本鉄鋼協会の論文
- 1953-09-25
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