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Volume 73 (1987)
- Issue 16 Pages 2157-
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Volume 72 (1986)
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Volume 71 (1985)
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Volume 70 (1984)
- Issue 16 Pages 2179-
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Volume 69 (1983)
- Issue 16 Pages 1945-
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Volume 68 (1982)
- Issue 16 Pages 2405-
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Volume 67 (1981)
- Issue 16 Pages 2573-
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- Issue 13 Pages S1111-
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Predecessor
Volume 55, Issue 5
Displaying 1-9 of 9 articles from this issue
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[in Japanese]1969 Volume 55 Issue 5 Pages 345-346
Published: April 01, 1969
Released on J-STAGE: October 12, 2010
JOURNAL FREE ACCESSDownload PDF (886K) -
Kazumi MORI, Hiroyuki NOMURA1969 Volume 55 Issue 5 Pages 347-354
Published: April 01, 1969
Released on J-STAGE: October 12, 2010
JOURNAL FREE ACCESSA mathematical model has been developed for scrap melting in the steelmaking process based on the concept of simultaneous heat and mass transfer. Steady state equations are established for heat and mass transfer in the boundary layer between solid and liquid. Heat conduction in the solid is expressed by an unsteady state equation. The thickness of diffusion layer and the thickness of scrap are chosen as the required parameters for the calculation. Numerical solutions are obtained by the finite difference method.
The calculation using the values of diffusion layer thickness (5×10-3-10-2cm) found by the authors indicates that the present model gives a general agreement with practical data in the case of simple form of scrap.
It is predicted that scrap form and size have an effect on the rate-determining mechanism of scrap melting and on the duration of transient heat conduction in the solid scrap. This is considered to be important in the performance of dynamic control.
It is thought that at the beginning of the process when the temperature of the bath is low and the bath turbulence is weak, iron would solidify on the cold scrap.
A limit of size of scrap for the rapid refining are also discussed.View full abstractDownload PDF (1341K) -
Hideya OKADA, Yuzo HOSOI, Ken-ichi YUKAWA, Hiromitsu NAITO1969 Volume 55 Issue 5 Pages 355-365
Published: April 01, 1969
Released on J-STAGE: October 12, 2010
JOURNAL FREE ACCESSUse of reflected polarized light and crossed nicols in microscopic observation of the polished crosssection of the rust makes it possible to distinguish optically active layer (FeOOH) and optically isotropic one in the rust. In the atmospheric corrosion resisting steel, the metal surface is almost completely covered with the optically isotropic layer after long periods of exposure to the atmosphe e
The experimental results of X-ray diffraction and cathodic reduction of the rust indicated that this optically isotropic layer was composed of amorphous spinet type iron oxide. This amorphous iron oxide is considered to be a polymeric ol-compound. The enrichment of Cu, Cr and P in the optically isotropic layer was found by means of electron probe microanalysis.
It was deduced that the significant corrosion resistance of atmospheric corrosion resisting steels was attributed to the formation of this amorphous layer. Alloying elements, such as Cu, Cr and P, are possibly beneficial to the formation of this layer.View full abstractDownload PDF (3651K) -
Shoki SATO, Kaname TATE1969 Volume 55 Issue 5 Pages 366-372
Published: April 01, 1969
Released on J-STAGE: October 12, 2010
JOURNAL FREE ACCESSInert gas fusion-gas chromatographic method was applied to the determination of nitrogen in steel.
The flow rate bf argon used for inert gas fusion was about 830ml/min, and the extraction was done at 2000°C for 3min. The condition for gas chromatograph was as follows; column length: 2m, column temperature: 40°C flow rate of argon: 100ml/min, and detector current: 190mA. The absorbent was activated charcoal.
Reproducibility of analytical results by proposed method has been proved to be excellent; coefficient of variation was 0.44%. Analytical results by this method had the same accuracy as that by JIS method. Time for analysis was about 10min. As the results, it is possible to use this method for determination of nitrogen in steel during steelmaking process.View full abstractDownload PDF (1216K) -
Zenji NISHIYAMA1969 Volume 55 Issue 5 Pages 373-380
Published: April 01, 1969
Released on J-STAGE: October 12, 2010
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Shizuya MAEKAWA1969 Volume 55 Issue 5 Pages 381-401
Published: April 01, 1969
Released on J-STAGE: October 12, 2010
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Etsuro SHUTO1969 Volume 55 Issue 5 Pages 402-409
Published: April 01, 1969
Released on J-STAGE: October 12, 2010
JOURNAL FREE ACCESSDownload PDF (2252K) -
Mineo KOSAKA1969 Volume 55 Issue 5 Pages 410-411
Published: April 01, 1969
Released on J-STAGE: October 12, 2010
JOURNAL FREE ACCESSDownload PDF (209K) -
1969 Volume 55 Issue 5 Pages 412-422
Published: April 01, 1969
Released on J-STAGE: December 22, 2010
JOURNAL FREE ACCESSDownload PDF (2939K)
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