巻号一覧
44 巻, 3 号
選択された号の論文の5件中1～5を表示しています
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佐藤 千之助, 佐藤 和二郎, 二階堂 稔, 金 順一1973 年 44 巻 3 号 p. 171-192
発行日: 1973/07/15
公開日: 2009/05/25
ジャーナル フリーIn this paper, the thermal stress in the graphite electrode, which is connected typically three rods of 20" in diameter, is analyzed by an elastic theory as an axially symmetrical thermal stress of cylinder with finite length. The axial and radial temperature distributions in electrode during the regular power (RP), high power (HP) and ultrahigh power (UHP) operations in arc steel making, are assumed with reference to the actual data of steel making arc furnace measured by Nedopil and Storzer. For the reason of convergency of analytical solution in the center of cylinder, the hollow cylinders with a small hole in the center are treated. These hollow cylinders are used partly at present because of the arc stability. The distributions of principal stress components were calculated numerically using the anisotropic mechanical properties of graphite at the temperature as a function of operating conditions of RP, HP and UHP.
The results of hollow electrode with small hole obtained here may be extended to the case of solid electrode for the evaluations of maximum thermal stress which occurs at the outer surface of electrode. The values and the positions of maximum stresses are discussed in comparison with the anisotropic properties of mechanical strength of graphite, and are investigated the current carrying capacities of graphite electrode. These analytical results agree very well with the actual fracture phenomena of graphite electrode observed in a model arc furnace.抄録全体を表示PDF形式でダウンロード (2234K) -
福井 彰一, 渡辺 敏幸, 礒川 憲二1973 年 44 巻 3 号 p. 193-200
発行日: 1973/07/15
公開日: 2009/05/25
ジャーナル フリーMechanical properties, metallurgical structures and fiber textures of Cu-Fe alloys were investigated and the following results were obtained.
(1) The quenched Cu-Fe alloys are harder than the slowly cooled Cu-Fe alloys after holding at the temperature range over the eutectic point, and the faster the cooling rate is, the larger the difference of hardness becomes.
(2) Cu-Fe alloys subjected to severe cold drawing come to have fine fibrous structures. On the said occasion the Fe-rich phases have strong <110> α fiber texture, but the Cu-rich phases only have weak <111> ε fiber texture.
(3) When the specimens are annealed at 800°C below the eutectic point, the Cu-rich phases recrystallize and come to have strong <111> ε fiber texture even before the recovery of the elongation. On the other hand the Fe-rich phases grow in size with the lapse of time. When they reach to a certain size, the elongation also reaches to a certain amount. The growth of the Fe-rich phases are in good accordance with the recovery of the elongation.抄録全体を表示PDF形式でダウンロード (9246K) -
加藤 剛志, 河野 富夫, 清水 孝純1973 年 44 巻 3 号 p. 201-206
発行日: 1973/07/15
公開日: 2009/05/25
ジャーナル フリーTo study the pitting behavior of austenite stainless steels, potentiostatic anodic polarization measurements were performed in NaCl solution at 35°C, varying the preparation of samples.
Its results are as follows:
1) Pitting potential free from crevice corrosion can be measured by the cathodic reduction method.
2) After applying the cathodic reduction method to the materials which were investigated the effect of Ta addition to SUS316 because of improvement of the pitting corrosion resistance, the pitting potential has a maximum value at 0.05%Ta.
3) The correlation between immersion pitting tests and anodic pitting tests is recognized, and the pitting potential measurement using the cathodic reduction method becomes a guide to predict the pitting behavior.抄録全体を表示PDF形式でダウンロード (6259K) -
宮本 孜, 柏木 繁, 岡野 尚敏1973 年 44 巻 3 号 p. 207-212
発行日: 1973/07/15
公開日: 2009/05/25
ジャーナル フリーThe ultrasonic testing is usually used for inspection of internal defects of steel billets and bars. The former has advantage of reduction of materials for inspection, and disadvantage of difficulties of inspection for bend, twist, bur and hair crack of material. In the latter case it is inverse, so we inspect billets for detection of serious defects (ex. primary pipe) and bars for detection of minute defects (ex. secondary pipe, nonmetallic inclusion, hair crack). This is the reason why we need the automatic ultrasonic inspection system of immersion method. The system is composed of two lines and dual-scanning for one line.
The inspection rate is 480 pieces/hour at the scanning speed of 30m/min for hot rolled round bars of 34∼75mm diameter. In practical operation, the defect over F 30% at the gain of STB V15-1.4F 80% and over 8mm to 50mm in length can be detected at the reliability of over 90% and error marking for noise is less than 2% without descaling.
Now, with double inspecting methed for billets and bars our products are guaranteed to over 99.99% for harmful internal defects.抄録全体を表示PDF形式でダウンロード (8918K) -
及部 好久1973 年 44 巻 3 号 p. 213-221
発行日: 1973/07/15
公開日: 2009/05/25
ジャーナル フリーCO2(CO2-O2) arc welding process has become one of the most popular welding processes in Japan.
And now, more efforts are made to get new features in this process. This report describes about the various advantages obtaining from the adoption of pail wires, and the related equipments developed by our Daido Steel Company.抄録全体を表示PDF形式でダウンロード (11642K)
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