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Volume 34, Issue 4-6
Displaying 1-6 of 6 articles from this issue
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Y. Matsushita1948 Volume 34 Issue 4-6 Pages 2-4
Published: June 30, 1948
Released on J-STAGE: July 09, 2009
JOURNAL FREE ACCESSWe have tried to reduce the steel making processes to some electric potential changes, When some insoluble electrodes dipped into the reacting metals and slags, and combined electrically to some normal electrodes, for example Ag/molten Agcl/molten P2O5, we have measured nearly 1, 000 mv in higher temperatures; the former has been charged negativelv and the latter positively. By means of these experiments we wish to be able to analysis the steel making reactions and ΔF will be known. If several simple reactions will be studied at the same time, Δ F° will be calculated, and consequently activities or activity coefficients of some components will be known.
Next we have analysed the deposits by electrolysis of some molten slags polarographicall and leave known several interesting facts.View full abstractDownload PDF (196K) -
[in Japanese]1948 Volume 34 Issue 4-6 Pages 4-7
Published: June 30, 1948
Released on J-STAGE: July 09, 2009
JOURNAL FREE ACCESSDownload PDF (252K) -
[in Japanese], [in Japanese]1948 Volume 34 Issue 4-6 Pages 7-12
Published: June 30, 1948
Released on J-STAGE: January 22, 2010
JOURNAL FREE ACCESSThe carbon steel, chromium steel, low nickel-chromium steel and mangan-chromium steel are widely used as the forging dies steel. The authors investigated the hardness due to various kinds of heat treatments and the moderate properties as the forging dies. As the results of this investigations, as far as the hardness, tensile strength, elongation, contraction of area, impact value at high temperature, and deformation due to heat treatment, and then the change of hardness due to repeated heating & cooling, the chromium steel is most excessive, and the low nickel-chromium steel and mangan-chromium steel are to be comparable to those of chromium steel by giving the initial sufficient hardness by proper heat treatment.View full abstractDownload PDF (1044K) -
The determination of FeO in molten ironShizuya Maekawa, Miyoshige Ebihara1948 Volume 34 Issue 4-6 Pages 12-15
Published: June 30, 1948
Released on J-STAGE: July 09, 2009
JOURNAL FREE ACCESSWe have examined the suitability of hot nitric acid method on cast iron, and as a result, it has bcen proved that this comparatively simple process being able to be applied to cast iron as well as to steel. The outline of experiment is follows:-
(1) Sampling: Sample 30-50gr. by drilling, in case of grey cast iron; and sample about 50gr. (about 10mm3) by crashing, in case of white pig; seem appropriate.
(2) Treating of graphite: Residues are treated as graphite remaining.
(3) KMnO4 treatment (to dissolve carbide): This procedure is to be repeated twice, so far as it does not contain special elements (Cr, W, etc.)
(4) NaOH treatment (to dissolve SiO2 gel): This procedure is to be repeated twice.View full abstractDownload PDF (812K) -
The determination of FeO in molten ironShizuya Maekawa, Miyoshige Ebihara1948 Volume 34 Issue 4-6 Pages 15-18
Published: June 30, 1948
Released on J-STAGE: January 22, 2010
JOURNAL FREE ACCESSThe authors have examined the consistent result of hot nitric acid method and made its comparative study with other methods. We have determined also the analysis of FeO in molten iron: the results of the experiment is as follows:
(1) The consistency could be assured.
(2) The results of hot Nitric acid method or hot sulphalic acid method turned out to be better than cold Nitric acid, Scott's electrolytic and Taylor-Austin's jod-solution method.
(3) Analysis of FeO is possible in molten iron as well as in molten steel.View full abstractDownload PDF (804K) -
Isamu Tsubaki1948 Volume 34 Issue 4-6 Pages 19-21
Published: June 30, 1948
Released on J-STAGE: July 09, 2009
JOURNAL FREE ACCESS(1) Analysis of Ferrotitauium; H2SO4 solution of ferrotitanium is reduced by amalgamatedzinc in the reductor and is tirated by KMnO4, then Fe+Ti=a (Fe2→Fe3, Ti33→Ti4) is obtained. After the reduction in the same manner Ti3 only is oxidized with sir-vibration (Ti3→Ti4) and again is titrated with KMnO4, then Fe=b (Fe2→Fe3) is obtained.
(2) Analysis of Ferrovanadium; Ferrovanadium as well as ferrotitanium can be titrated in the same manner, then Fe+3V=a (Fe2→Fe3, V2→V5) is obtained. After reduction of the solution in the same manner, V2 only is oxidized with air-vibration (V2→V4) using CuSO4 as catalyser, then Fe+V=b (Fe2→Fe3, V4→V5) is obtained.
(3) Analysis of Ferrochromium; HCL solution of ferrochromium is reduced by amalgamatedzinc in the reduction and titrated with K2Cr2O7 using diphenylamine as indicator, then Fe+Cr=a (Fe2→Fe3, Cr2→Cr3) is obtained.
But as chromium has not been reduced to Cr2, so that the proper correction must be made. After the HCl solutions is reduced as same manner, Cr2 only is oxidized with air-vibration (Cr2→Cr3), ahd titrated by K2Cr2O7 then Fe=b (Fe2→Fe3) is obtained.View full abstractDownload PDF (197K)
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