Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
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Volume 37, Issue 4
Displaying 1-9 of 9 articles from this issue
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  • MAKING OF THE LOW PHOSPHORUS PIG IRON WITH HEROULT'S ELECTRIC FURNACE
    Susumu Oishi
    1951 Volume 37 Issue 4 Pages 194-202
    Published: April 25, 1951
    Released on J-STAGE: July 09, 2009
    DOIhttps://doi.org/10.2355/tetsutohagane1915.37.4_194
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    In our country, the high grade carbon steel have been maked chiefly with the acidic open hearth furnace, for which the low phosphorus pig iron is needed.
    Auther maked it with Heroult's electric furnace from the steel scraps, investigated it statistically and decided the standard operation; following results were obtained.
    (1) Cost of making is cheap, but operation is very delicate.
    (2) The problem of carbon addition must be most researched.
    (3) In taking phosphorus off, the basisity and (ΣFeO)% of the slag agree with tbe result of Schenk's theory; basisity is 1.5-2.0, (ΣFeO)% is 20-30% and operation temperature is 1300-1450°C
    (4) Sulphur matters little.
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  • ON THE METHOD OF RAPID JUDGMENT OF BASICITY OF ELECTRIC ARC FURNACE SLAG
    Kiichiro Shinji
    1951 Volume 37 Issue 4 Pages 203-207
    Published: April 25, 1951
    Released on J-STAGE: July 09, 2009
    DOIhttps://doi.org/10.2355/tetsutohagane1915.37.4_203
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    The author investigated the relations between the basicity and the microstructure of slag by the reflecting microscope and determined the standard microstructures of slag for the purpose of making the steel of higher quality by properly controlling the basicity of slag.
    The basicity of slag is able to be judged according to these standard microstructures and it takes about 5-10 minutes to prepare sample and investigate the structure by microscope Therefore this method can be applied to operation of steel making.
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  • STUDY ON THE MELTING OF CAST STEEL BY THE BASIC ELECTRIC ARC FURNACE (Supplement)
    Toshihiro Kinoshita
    1951 Volume 37 Issue 4 Pages 208-212
    Published: April 25, 1951
    Released on J-STAGE: July 09, 2009
    DOIhttps://doi.org/10.2355/tetsutohagane1915.37.4_208
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    Generally, mechanical properties of cast steel are not equal in every case, according to their melting conditions. For examples, steels of the almost same chemical compositions have not equal mechanical properties in evesy case, especially in their elongation. These causes are studied from the melting conditions, and we gained following conclusions.
    (1) When the melting is abnormal, mechanical properties of the cast steel are abnormal, too.
    (2) Si content affect especially to the elongation.
    (3) Non-metallic inclusions may be the greatest factor affecting these properties.
    Shock test is carried out, too, and we reached to the same conclusions. As for the non-metallic inclusions, it is reported that Si content of 0.3-0.4% is the best condition for decreasing them. And our result agree well, too. When the melting is not normal, and Si content is low, Si should be added to the standard (Si=0.3-0.4%). This method is tested and proved satisfactory.
    At last, our melting operation is compared for many other foundry operations and proved not inferior to them.
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  • ON THK BEHAVIOUR OF HARDNESS-CURVE OF QUENCHED STEELS (II)
    Tokushichi Mishima, Tetsutaro Mitsuhashi
    1951 Volume 37 Issue 4 Pages 212-215
    Published: April 25, 1951
    Released on J-STAGE: July 09, 2009
    DOIhttps://doi.org/10.2355/tetsutohagane1915.37.4_212
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    (1) The hardness decreasing of quenched steel by higher quench temperature will be caused mainly by the decarburising and the increasing of amount of residual austenite, and not by the grain growth, which will cause hardness decreasing of only 5 units of Rockwell C scale by the increasing of 5 grain size number (32 times in number of grain size).
    (2) Between the grain size and the hardness of martensitie steels (several alloyed steels) and high carbon steel, the following relation appears to exist: HB=plogn+q
    (p, q: const. n: numbers of grains, HB=Hardness)
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  • STUDIES ON THE HEAT TREATMENTS OF CONSTRUCTIONAI ALLOY STEELS (II)
    On the Transformations of Alloy Steels During Continuous Cooling
    Taiji Kawai, Kusuo Ogawa
    1951 Volume 37 Issue 4 Pages 216-233
    Published: April 25, 1951
    Released on J-STAGE: July 09, 2009
    DOIhttps://doi.org/10.2355/tetsutohagane1915.37.4_216
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    In order to make clear the hardenabilities of Mn-Cr and Mn-Cr-Mo steels, the continuous cooling diagrams were studied by means of both Jominy end-quench method and differential dilatometric quenching tests. From these results quenching diagrams of both steels were introduoed, and relations between isothermal and continuous cooling transformations were discussed in this reports.
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  • STUDY ON FIBROUS STRUCTURE OF STEEL (III)
    Relation between Ferrite-banding and Heat-treatment
    Michira Uchiyama
    1951 Volume 37 Issue 4 Pages 234-238
    Published: April 25, 1951
    Released on J-STAGE: July 09, 2009
    DOIhttps://doi.org/10.2355/tetsutohagane1915.37.4_234
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    The S curve and fiber growth of free cutting steels were measured here, and arrived at the following result.
    1. The phenomenon of "critical cooling velocity of ferrite banding" appears in pearlite field of S curve.
    2. "Critical cooling velocity of ferrite banding" as well as critical structure of ferrite banding in S curve is irreversible.
    3. Naturally, grain growth is reversible reaction. On the other hand fiber growth is undoubtedly irreversible one.
    4. MnS inclusion contains in primary ferrite banding of free cutting steel, but it does not affect its artificial secondary ferrite banding.
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  • STANDARD DIMENSIONS OF PRODUCER GAS FIRED OPEN HEARTH FURNACES
    Yasumi Doi
    1951 Volume 37 Issue 4 Pages 239-243
    Published: April 25, 1951
    Released on J-STAGE: July 09, 2009
    DOIhttps://doi.org/10.2355/tetsutohagane1915.37.4_239
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    The general design of open hearth furnaces in Japan has been much influenced by that of German practice, furnaces for cold charge scrap process being, mostly Maerz type. After the War many disadvantages of our furnaces were pointed out by the American metallurgists who gave us very useful data, though producer gas fired furnace does not exist now in the United States. Considering, however, special conditions in our country, it was thought difficult to remodel immediately the present installation, so we studied the practical results of furnaces of various examples and determined the most ideal dimensions for producer gas firing basic fixed Venturi type open hearth furnaces of 40, 50, 60 and 80-ton capacities for cold charge scrap process.
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  • [title in Japanese]
    1951 Volume 37 Issue 4 Pages 244-246,249
    Published: April 25, 1951
    Released on J-STAGE: July 09, 2009
    DOIhttps://doi.org/10.2355/tetsutohagane1915.37.4_244
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  • [title in Japanese]
    1951 Volume 37 Issue 4 Pages 250
    Published: April 25, 1951
    Released on J-STAGE: July 09, 2009
    DOIhttps://doi.org/10.2355/tetsutohagane1915.37.4_250
    JOURNAL FREE ACCESS
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