鐵と鋼
Online ISSN : 1883-2954
Print ISSN : 0021-1575
34 巻, 12 号
選択された号の論文の6件中1~6を表示しています
  • 松下 幸雄, 森 一美
    1948 年 34 巻 12 号 p. 1-9
    発行日: 1948/12/25
    公開日: 2009/07/09
    ジャーナル フリー
    (1) We tried some steel making reactions to reduce into the electric potential curves. Namely, the potential differences between C or SiC electrodes and reacting vessels in higher temperatures were compared with a certain Ag-standard half cell. By expanding to larger scales, many important reactions will be further analysed.
    (2) Refering to the former term, we determined the activities and activity coeffieients of several components which were assumed neutral. But molten slags are mostly dissociated into ions, and so we wish to think about the activities in such points of view.
    (3) We analysed some reactions statistical-thermodynamically. Some reactions were classified in several types, and decarburizing reactions and gas removing ones were served as two examples.
    (4) Molten slags were studied physico-chemically. Slags are the ionic lattices in room temperatures, and in higher they decompose into anions and cations. So molten slags were decomposed by D.C. and the deposits were analysed polarographically. Next, we measured the dielectric constants of molten slags and concluded that they were polarized by the dipole moments im higher temperatures.
  • 大中 都四郎
    1948 年 34 巻 12 号 p. 9-14
    発行日: 1948/12/25
    公開日: 2009/07/09
    ジャーナル フリー
    The steel melting process is thought as oxidation-reduction phenomena done by controlling the oxidising power of molten slag. So, if this oxidising power of molten slag could be measured in the course of melting, the steel melting process would be improved. The author intended to measure it electrochemically.
    In the first report, it is explained that the oxidising power of molten slag is the oxidising potential of molten slag, and it will be measured by measnring the oxygen activity in molten slag.
    From this point of view, the potential difference of a cell "pt I/slag I/slag II/pt II" was measured and this potential differenee reversibly changed according to the change of oxidising potential of the "slag I." Therefore, if for the half cell of "slag II/pt II, " another standard half cell could be placed, like hydrogen gas electrode in water solution, the oxidising power of the "slag I" would be measured with platinum electrode.
    For this standard half cell, molton silver saturated with oxygen was tried in this report. At first the potential difference of a cell "Ag/slag/Ag" was measured, and recognized that it was available as a standard half cell.
    So the potential difference of a cell "pt/slag/Ag saturated with O2" was measured and recognized that this potential difference reversively changed according to the change of the activity of the oxygen in the molten slag, and that the oxidising power of the molten slag could be measurad.
  • 前川 靜彌
    1948 年 34 巻 12 号 p. 14-18
    発行日: 1948/12/25
    公開日: 2009/07/09
    ジャーナル フリー
    After the chemical, physical and microscopic investigations on some foundry sands in Hakkaido, the author found the most appropriate mixingratio of sand. The outline of the experiments is as follows:
    (1) Chemical components; silica is less, felspar and clay are more, therefore, its refractoriness is low.
    (2) Fineness; sand-grade is less and silt-grade is more.
    (3) Grain size: globublars are scarce generally.
    (4) Mixing of sand; green sand 50%, silica powder 30% and sea sand 20%.
  • 前川 靜彌
    1948 年 34 巻 12 号 p. 19-20
    発行日: 1948/12/25
    公開日: 2009/07/09
    ジャーナル フリー
    Some experiments for improvement of skin-smooth of castings were carried out. The conditions for improvement, found by the author are as follows:
    (1) Sand used; mixed sand (green sand 50%, silica-powder 30%, and sea-sand 20%) to be used for the skin sand
    (2) Humidity; 6-9%
    (3) Binder; "Ozin" 2·0-1·5% if possible.
    (4) Drying; Surfaee to be dried by simple drier.
    (5) Fineness; Skin sand should be under 0·3m/m.
  • 堀田 秀次
    1948 年 34 巻 12 号 p. 20-24
    発行日: 1948/12/25
    公開日: 2009/07/09
    ジャーナル フリー
    (1) The use of about 5% Calcium Silicide (Ca Si) preheated powder n the ladle of the cupola furnace improves the desulphurisingaction for the molten east iron, and increases its tensile strength slightly. Si content increases slightly and total carbon and manganese content decreases slightly by addition of CaSi powder in the ladle,
    (2) The use of CaSi powder n the ladle cannot eliminate the blow hole completely, as CaSi contains a little amount of gas which remains still after the preheating.
    (3) The use of abont 5% calcium silicide lump from the charging door of the furnace improves the desulphurising action for the molten cast iron not remarkably compared with CaSi powder in the ladle; because the light CaSi escapes out from the chimney, and it varies as the furnace condition, etc.
    (4) It is concluded that the use of suf ficient amount of preheated CaSi powder in the ladle improves the desulphurising action and the mechanical properties and the quality of casting to a certain extent.
  • 1948 年 34 巻 12 号 p. 24-26
    発行日: 1948/12/25
    公開日: 2009/07/09
    ジャーナル フリー
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