巻号一覧
52 巻, 1 号
選択された号の論文の7件中1～7を表示しています
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石田 二郎, 山口 国男, 杉浦 三朗, 山野 清市, 早川 静則, 出向井 登1981 年 52 巻 1 号 p. 2-8
発行日: 1981/01/15
公開日: 2009/05/25
ジャーナル フリー2.5ton ladle furnace with graphite arc heating was constructed in September 1978. About 100 heats were carried out by this ladle furnace to investigate the effects of strong gas stirring on the metallurgical reactions such as hydrogen removal and desulfurization etc.
It was confirmed in our experiment that hydrogen content in steel could be lowered to the level comparable to vacuum refined steel, and other metallurgical reactions could be much accelerated by strong gas stirring.抄録全体を表示PDF形式でダウンロード (298K) -
稲垣 悦郎, 水谷 浩1981 年 52 巻 1 号 p. 9-19
発行日: 1981/01/15
公開日: 2009/05/25
ジャーナル フリーW.E. Schwabe and B. Bowman introduced a conception of reactance factor when arc furnace is under operation.
H. Noda and I. Eguchi also reported the variation of reactance, input power and power factor while arc furnace is in operation at the VIIIth U.I.E. Congress.
After that we developed digitalized measurement device after making more accurate quantitative analysis about the above written electrical characteristic value.
The results obtained are as follows:
(1) About reactance value there is no big difference between the factor obtained by mean electrical value and that obtained by effective value.
(2) Reactance factor can be universally expressed regardless characteristic values of arc furnace, voltage tap position of transformer and so forth by application of normalized current (I/Is) obtained after dividing short circuit current (Is) by undergiven respective voltage.
(3) Accordingly, electrical characteristics at operation time can be obtained by understanding of short circuit impedance, voltage tap of transformer of arc furnace circuit and thus design and control can effectively be utilized.抄録全体を表示PDF形式でダウンロード (2355K) -
牛山 博美, 矢島 忠正, 北川 修三, 畑 浩巳1981 年 52 巻 1 号 p. 20-27
発行日: 1981/01/15
公開日: 2009/05/25
ジャーナル フリーAOD-C-B process was developed in 1978 and since then has been adopted for all AOD heats. The outline of the process is as follows, : the secondary oxygen is blown from the top of the vessel to burn CO to CO2 above the bath surface and the heat generated there is directly transferred to the bath being stirred vigorously by tuyere oxygen and inert gas.
The reduction of power and Si consumption and the improvements of the heat economy have been obtained with other operational advantages by this process in last two and a half years.抄録全体を表示PDF形式でダウンロード (362K) -
石田 二郎, 小野 清雄, 池田 雅宣1981 年 52 巻 1 号 p. 28-35
発行日: 1981/01/15
公開日: 2009/05/25
ジャーナル フリーLaboratory and scaled-up experiments were performed to investigate the air oxidation mechanism during casting of the low alloy molten steel.
Oxygen pick-up of 54ppm and the formation of fine oxide inclusions occurred at the casting stream surface in the laboratory air casting experiment. In the scaled-up air casting experiment, on the contrary, oxygen pick-up at the casting stream surface was negligible. But large amount of oxygen pick-up and the formation of Mn silicate inclusions were observed near the falling area of the casting stream. This may be due to the entrainment of air which exists in concave parts of the casting stream.
The surface perturbance and the gas volume in convace parts of the casting stream increased with the increase of the length of the stream, though the surface perturbance was very slight just under the nozzle of the ladle.
These results predict that air oxidation during casting can be better prevented by means of argon shrouding near the falling area of the casting stream.抄録全体を表示PDF形式でダウンロード (1971K) -
杉浦 三朗, 山野 清市, 早川 静則, 山崎 英雄1981 年 52 巻 1 号 p. 36-46
発行日: 1981/01/15
公開日: 2009/05/25
ジャーナル フリーDouble centrifugal casting tube made of 2 different metals arranged concentrically is able to have contradicting material characteristics at the same time and therefore, its utilization value is high and for instance it is being employed as roller for transportation of heated good and lifting pipe etc.
Although it has especially been hard to manufacture the double centrifugal casting tube when solidification temperature of outer layer material is lower than that of inner layer material the writer and et al were able to establish the manufacturing condition by adoption of flux addition, temperature control and 2-hole type nozzle casting抄録全体を表示PDF形式でダウンロード (5377K) -
長 隆郎, 井上 道雄1981 年 52 巻 1 号 p. 47-57
発行日: 1981/01/15
公開日: 2009/05/25
ジャーナル フリーThe rates of nitrogen desorption of liquid iron and liquid Fe-Cr alloys are explained by the application of the mixed-control model including the mass transfer in the liquid phase and the chemical reaction at the interface where an adsorbed nitrogen atom collides with a nitrogen atom in the liquid phase and then a nitrogen molecule is formed. Although the rate of nitrogen desorption has been regarded as the chemical reaction control, the mass transfer in liquid iron may play an important role on the nitrogen desorption at the lower oxygen range.
It is also found that the apparent mass transfer coefficient of nitrogen absorption kNI are illustrated by applying same mixed-control model.
The oxygen absorptions of liquid iron, liquid Fe-Cr and Fe-Cr-Ni alloys from gas phase are represented by a model that the most of gaseous oxygen dissolves into liquid iron through oxide free interface, although some of them forms iron oxide at the interface and then dissolves into liquid iron. This model is valid for liquid iron in the range above 0.057atm PO2 and for liquid Fe-18Cr alloy above 0.003atm PO2 When the partial pressure of oxygen is lower than those values, however, the formation of oxide could be practically ignored, so that the rate of oxygen absorption is controlled simply by the mass transfer in gas phase. On the other hand, the amount of oxygen accumulated at the interface as oxide phase in liquid alloy should be larger than that in liquid iron under the same oxygen potential.抄録全体を表示PDF形式でダウンロード (598K) -
葛西 靖正, 太田 久司, 成瀬 隆1981 年 52 巻 1 号 p. 58-65
発行日: 1981/01/15
公開日: 2009/05/25
ジャーナル フリーAn innovatory hardenability (Jominy-curve) predictor, J-COMP (Jominy-curve computation process) has been developed. The profile of the curve itself is considered a crucial parameter in this method, and hence there is greater accuracy in prediction than with conventional DI method, multi-regression method at fixed points, and kirkaldy's method.
It is being successfully applied to fabrication processes of low alloy structural steels, including grade designing, melting and degassing, and inspection; and to the prediction of mechanical properties of heat-treated parts. It has also been successfully used in the development of new grade steels such as ULO-H and Mo-saved carburizing steels.抄録全体を表示PDF形式でダウンロード (1230K)
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