Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
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Volume 35, Issue 4
Displaying 1-7 of 7 articles from this issue
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  • ON THE CONSISTENCY OF THE ENTIRE PROCEDURE IN THE OPEN HEARTH PROCESS AS VIEWED FROM THE PHYSICO-CHEMICAL STANDPOINT. (II)
    Toshiro Onaka
    1949 Volume 35 Issue 4 Pages 94-98
    Published: April 25, 1949
    Released on J-STAGE: May 26, 2009
    DOIhttps://doi.org/10.2355/tetsutohagane1915.35.4_94
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    To Protect the oxydation of steel bath Si, Mn and C are used. But it is not sufficient for this purpose to merely charge these elements with steel scrap in the furnace.
    According to the temperature rising, the ability of Si and Mn to Protect the oxydation of steel bath declines, so C has gradually take plnce of Si and Mn. But C is impossible to protect the oxydation, unless the reaction of C and O is introduced with the vigorous discharge of CO gas.
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  • ON THE REACTION OF CHROMIUM UNDER BASIC SLAG (I)
    Taiichi Saito
    1949 Volume 35 Issue 4 Pages 98-103
    Published: April 25, 1949
    Released on J-STAGE: January 22, 2010
    DOIhttps://doi.org/10.2355/tetsutohagane1915.35.4_98
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    The reaction of chromium under basic, slag has been experimentally studied in laboratory furnace. In the basic slag (CaO/SiO2>2), it was found that the oxide of chromium presents as chromic-oxide, so the reaction of chromium under basic slag should be cxpressed as follow:-
    2[Gr]+3(FeO)_??_(Cr2O3)+3[Fe]
    The auther proposed as the temperature coeffcient of the equilibrium consant KBCr=(Cr2O3)/[Cr][Cr]2(FeO)3 of this reaction
    log KBCr=15, 000/T-10.0
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  • STUDIES ON THE FLAKE-LIKE DEFECTS IN STEEL
    EFFECT OF OXYGFN
    Yoshio Shimokawa
    1949 Volume 35 Issue 4 Pages 104-110
    Published: April 25, 1949
    Released on J-STAGE: May 26, 2009
    DOIhttps://doi.org/10.2355/tetsutohagane1915.35.4_104
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    The results of the experiments concerning with the effect of oxygen are summerized as follows:
    (1) By the statistical method the oxygen content of steel may not relate to the appearance of flakes, because the critical oxygen value for flakeformation can not be determined as the critical hydrogen value can be.
    (2) There is also no distinct relation between the non metallic inclusion (SiO2 and Al2O3) or nitrogen content in steel and the appearance of flakes statistically.
    (3) Although the oxygen-rich material (mill scake, Fe2O3, MnO2) or a little deoxydation material (Al, Fe-Ti etc) be added into the molten steel, no distinct variation on the appearance of flakes in steel can be recognized.
    4) If the oxygen-rich material be added the hydrogen content extruded at the high temperature increase a little.
    5) If we add Al or Fe-Ti into the molten steel more and more, the appearance of flakes weaken and then vanish. But this phenomenon is not founded on the effect of oxygen, but on the, variation of chemical and mechanical properties of steel.
    6) Then is imagined that the effect of oxygen would be indirect, for intance, the oxygen rich part would be weak point to the other stress concerning with the flkeformation.
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  • STUDY ON THE TOOL STEEL FOR HOT WORKING (I)
    Sadao Koshiba, Sukeo Nagashima
    1949 Volume 35 Issue 4 Pages 110-114
    Published: April 25, 1949
    Released on J-STAGE: May 26, 2009
    DOIhttps://doi.org/10.2355/tetsutohagane1915.35.4_110
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    Tool steel for hot work such as drawing of copper, brass and aluminium pipes or angles, i.e, "DC" hitherto made in Yasugi Works of Hitachi, Ltd. are composed from 0.2-0.3% C, 2-2.5% Cr, 9-11% W, 0.3-0.5% V. A series of experiments has been carried out to study the effect of carbon on this steel, i.e. transformation point, hardness and impact value in room temperature and high temperature, changes of hardness due to repeated heating and cooling, microstru ?? ture of sample steel subjected to different heat treatments were measured.
    As the results of this experiments, self hardening property, quenching and tempering hardness, and hot hardness increases as the carbon, but inpact value in the temperature between 20-750°C decreases.
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  • MANUFACTURE OF HIGH SPEED STEEL CUTTING TOOL BY NEW METHOD OF DEPOSIT METAL AND ITS NATURE
    Toshihiko Simomura, Tatsuro Kaida
    1949 Volume 35 Issue 4 Pages 115-120
    Published: April 25, 1949
    Released on J-STAGE: May 26, 2009
    DOIhttps://doi.org/10.2355/tetsutohagane1915.35.4_115
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    This is the method that deposit the square bar (5-6mm) which solidifies the high speed steel turning scrap with the flux, on the edge of cutting tool. by oxy-acetylene burner.
    Then, another one is the method that weld the forged round bar of high speed steel by electricity in the flux.
    The cutting durability of the former new cutting tool is 100-120%, but the latter is 80-90%, of natural high speed steel tool.
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  • [title in Japanese]
    1949 Volume 35 Issue 4 Pages 120-121
    Published: April 25, 1949
    Released on J-STAGE: May 26, 2009
    DOIhttps://doi.org/10.2355/tetsutohagane1915.35.4_120
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  • [title in Japanese]
    1949 Volume 35 Issue 4 Pages 122-123
    Published: April 25, 1949
    Released on J-STAGE: May 26, 2009
    DOIhttps://doi.org/10.2355/tetsutohagane1915.35.4_122
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