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Volume 37, Issue 12
Displaying 1-9 of 9 articles from this issue
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Tatsuji Uno, Etsuro Honma1951 Volume 37 Issue 12 Pages 627-643
Published: December 25, 1951
Released on J-STAGE: July 09, 2009
JOURNAL FREE ACCESSThe reduction equilibrium of ferrous sulphide by CO gas was investigated for the temperature range of 800-1100°C by means of flow method.
The equation and the epuilibrium constant of this reaction may be written as follows,
FeS+CO=Fe+COS, K1=pcos/pco
The relation between temperature and this equilibrium constant was obtained as
logK1=logpcos/pco=-2, 014.7/T-2.198
From this result, the relations between temperature and the epuilibrium constant of the reactions,
FeS+CO2=FeO+COS
3FeS+4CO2=Fe3O4+CO+3COS
were computed respectively as
logK4=logpcos/pco2-2, 917.5/T-1.097
logK5=logp3cos.pco/p4co2=-7, 084.2/T-5.282
From these results, equilibrium diagram between pco/pco2 and pcos for FeS was obtained.
Further, the relation between temperature and the equilibrium constant of the reaction
CO+1/2S2=COS
was computed as
logK8=logpcos/p1/2s2.pco=6, 443.5/T-5.418View full abstractDownload PDF (328K) -
ON THE GRAIN SIZE OF SPECIAL CAST STEELHideo Mikashima1951 Volume 37 Issue 12 Pages 643-651
Published: December 25, 1951
Released on J-STAGE: July 09, 2009
JOURNAL FREE ACCESSBy addition of Si, Mn Ni etc. to Cr Mo cast steels and W, V, Ti, Al etc. to Cr Mn Si cast steels, their effect on the grain size was investigated by means of carburization test at 925°C for 6 honrs. Further the same examination was carried out on the effect of grain growth on the austenitic or martensitic structure by a superheated carburizing method at 900°-1150°C for 6 hours and by oil quenching at the same temperature (held for 20 minutes.)
As result of study on the grain growth of these steels, it was found that Cr Mo cast steel added with Mn started to coarsen at 950°C-1000°C, while Mn Si cast steel added with Cr did at 1000°C.
In Si, Ti, Al added cast steels, however, coarsening was not recognized at temperatures below 1100°C
Tests on these cast steels indicate that the addition of Si, W, V, Ti or Al has a marked effect on grain refining and inhibition of grain growth, but the addition of Ni or Mn has no such essential effect.
Examination of many special cast steels shows that the coarsening temperature for low or medium carbon steels varies between Ac3, points and 1100°C, but the growth of grains is especially remarkable at temperature between 950°-1100°C., and the steels that begin to coarsen at tempe ratures above 1000°C are rare. Mechanism of inhibition for austenitic grain growth was also inquired.View full abstractDownload PDF (580K) -
Hatuma Nisihara1951 Volume 37 Issue 12 Pages 652-662
Published: December 25, 1951
Released on J-STAGE: July 09, 2009
JOURNAL FREE ACCESSIt was investigated, how much effect have the very fine particles on the quality of moulding sand by means of such method that the four very final particles are blended in the moulding sand and the permeability and strength of the sand were studied.
The result showed that in the relation of the permeability and the strength, it is important that in case the permeability is maximum, the strength is the highest.View full abstractDownload PDF (556K) -
1951 Volume 37 Issue 12 Pages 662
Published: 1951
Released on J-STAGE: July 09, 2009
JOURNAL FREE ACCESSDownload PDF (53K) -
Kiyoji Deguchi, Riichi Suga1951 Volume 37 Issue 12 Pages 663-670
Published: December 25, 1951
Released on J-STAGE: July 09, 2009
JOURNAL FREE ACCESSSuperior tools must have, not only high hardness, but also considerable toughness.
Hardness of the tools must be generally higher than about 55 (Rockwell C 150kg), to show the good cutting ability. It is, therefore, difficult to study the little differences of the toughness of these hard steels by the, Charpy impact test or by the tensile test.
Thus the authors ineasured the change of the impact torsion values by different tempering temperatures. At the same time, they made the crushing (bending) tests and measured the crushing (bending) strength, the deformation amount and the energy consumed until their failure.
The tool steels studied were: (1) Two series of carbon steels and 1% chromium steels, both containing about 0.6-1.5% C (2) Special tool steels, that is, Cr-W and Cr-W-V steels and (3) High speed steels.
From these results, the authors discussed the change of the hardness and the toughness of the tool steels by different tempering temperatures, comparing them with that of their microstructures.View full abstractDownload PDF (2801K) -
Jiro Terada1951 Volume 37 Issue 12 Pages 671-676
Published: December 25, 1951
Released on J-STAGE: July 09, 2009
JOURNAL FREE ACCESSThis report is the results of studies and discussions of the Committee on manufacture of steel ingots most suitable for making solid drawn tubes and consists part of the subject in research:
"Study on the manufacture of high quality low-carbon steel"
Steel lngots for solid drawn tubes were made by the Nippon Steel Tube Co. Ltd., the New Fuso Metal Industries, Co. Ltd., the Yawata Iron and Steel Co. Ltd. and Amagasaki Iron and Steel Co. Ltd. The Yawata Steel Works supplied the billet to the Nippon Tokushu Steel Tube Co. Ltd. As each of these tube manufacturers had depended on its own special means of processing, it was somewhat difficult to define ingots most suitable for making good tubes. Thus both rimmed and killed ingots were used for making tubes of adequate quality
In this report the steel-making processes of all the above mentioned works were reviewed and discussed.View full abstractDownload PDF (385K) -
1951 Volume 37 Issue 12 Pages 677-681
Published: December 25, 1951
Released on J-STAGE: July 09, 2009
JOURNAL FREE ACCESSDownload PDF (380K) -
1951 Volume 37 Issue 12 Pages 682-683
Published: December 25, 1951
Released on J-STAGE: July 09, 2009
JOURNAL FREE ACCESSDownload PDF (692K) -
1951 Volume 37 Issue 12 Pages 685
Published: December 25, 1951
Released on J-STAGE: July 09, 2009
JOURNAL FREE ACCESSDownload PDF (57K)
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