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鉄と鋼
Vol. 50 (1964), No. 2

鉄と鋼 Vol. 50 (1964), No. 2

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オンライン版ISSN:	1883-2954
冊子版ISSN:	0021-1575
発行機関:	The Iron and Steel Institute of Japan

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キーワードランキング

22 Dec. (Last 30 Days)

鉄と鋼 Vol. 50 (1964), No. 2

技術革新時代におもう

佐野幸吉

pp. 149-150

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Speed of Carbon Deposition in Ore Reduction

Tanekazu SOMA

pp. 151-159

抄録

PURPOSE: In ore reduction by CO at low temperature, the reaction of carbon deposition occurs violently.In a blast furnace, carbon deposit sometimes caused hanging.To clarify the kinetics of carbon deposition, this experiment was done in a stationary bed.
METHOD: In a standard state, next factors were chosen; ore-self-fluxing sinter, size-2.5mm-5mm, weight-50g, CO flow-1Nl/min, temperature-550°C, and these factors were changed one by one. A 41mm inner diameter porcelain combustion tube was used as a reduction tube.The furnace temperature was regulated automatically.Weight of deposited carbon and reduction degree were calculated by gas volume change and CO₂ concentration change through reaction bed.
RESULTS: With a certain timelag, carbon deposit occurred at a constant speed of deposition.
The lower the temperature the higher the speed of carbon deposition, and the lower the temperature below 450°C, the delay time of carbon deposit rapidly increases. At the higher temperature the furnace pressure rose by the smaller amount of carbon deposit.
Carbon deposit occurred in a very thin layer.
Ore size little influenced the carbon deposit.
While the CO flow was not large, the speed of carbon deposition was proportional to the flow, but when the CO flow grew larger, it fell down from the proportional value.
In reduction by N₂+CO gas, the speed of carbon deposition was proportional to the CO concentration and the delay time grew long.
In reduction by CO+CO₂ gas, the speed of carbon deposition was proportional to (46-CO₂%) and the delay time grew extremly long.
When some ballast was mixed in the ore, the speed did not change. But the furnace pressure rose slightly later.The furnace diameter did not influence on the speed of carbon deposition, but the furnace pressure rose by the carbon deposit proportional to the cross secton of furnace.
When heating at constant speed, carbon deposited under 760°C and dissolved over 760°C. Thereby the reduction degree improved very much;about 2g of carbon deposit was used by direct reduction, this was equivalent to about 25% reduction degree.(Received 13 July 1963)

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On the Rate of Fluidized-Bed Reduction of Iron Ore.

Akimitsu OKURA, Yukio MATSUSHITA

pp. 159-165

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Authors presented the following empirical equation on the rate of reducing reaction. dW/d t=-K (W₀-w)
where W₀ is oxygen volume combined with iron in are (g/cm³), w is oxygen volume combined with iron in are after reduction for some time (g/cm³), W is oxygen volume removed per unit time with reduction (g/min), K is reaction rate constant, and t is time (min), so that W is equal to W for t=0.
Authors have studied on the fluidized bed reduction of iron are powder by hydrogen gasunder atmospheric or increased pressure with a laboratory scale apparatus.
On the basis of the above equation, the mechanism of fluidized reduction was discussed.
The results are as follows.
1) For fluidized bed reduction under atmospheric pressure at less than 500°C, the reduction rate is considered to be controlled by its reaction rate. Meanwhile it is controlled by diffusion rate over 600°C. In the intermediate temperature region, the reduction is affected by both these rates.
2) The reduction under increased pressure is controlled by the reaction rate near 400°C, while it is controlled by the diffusion rate over 5000°C.
3) The effect of gas film on the surface of particles becomes important with a decreasing flow rate, especially below 20l/min for 50mm ∅; bed.

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Influence of the Ingot Size on Segregation of S in Rimmed Steel Slab Ingots

Kozo MORINAGA, Kazutomo KITAGAWA, Susumu SATO, Soichi IZUMI

pp. 166-173

抄録

Recent advance of steelmaking, especially application of LD process has made it necessary to use an enlarged rimmed slab ingot. Under this circumstance, it became important to select the dimensions of the ingot so that the segregating zone may be as small as possible and high yield of slabbing may be ensured.
Authors investigated the effect of dimensions of ingot on the segregation, used several experimental molds with varied thickness, height, ratio of width to thickness and weight, in Muroran Iron Works, Fuji Iron & Steel Co. Ltd.
The obtained results were as follows.
(1) The effect of three factors representing the design of ingot on sulphur-segregation seems to be greater in the following order;thickness, height and width.
(2) Increase in the thickness of ingot tends to reduce the degree of max. segregation, change the location of max.segregating zone (segregating ratio is over 4).
In the case of track-time being less than 3 hrs, two peaks of segregation appear as the thickness of ingot exceeds 800mm.
(3) When the height of ingot is increased, the location of max. segregation is changed to top-side and the range of high segregating zone is reduced.
(4) The high segregation of rimmed steel ingot consists of two kinds of segregation, one with the location charged to bottom-side and one with the location not changed by the dimensions of ingot.And as these segregations are overlapped, the peak appears only one, besides double peaks do as the segregation is separated.

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Effects of Niobium on Steel

Kiichi NARITA, Atsusi MIYAMOTO

pp. 174-182

抄録

As a part of the study of special chemical elements in steel, we have investigated the effects of niobium upon the properties of steel. The following are the results of test;
1. Niobium added to steel refines remarkably the cast structure and austenite structure of steel. An adequate and yet minimum quantity of niobium necessary for the refining control of austenite--grains in steel is 0.03 to 004%.
2. With an addition of niobium, the coarsening temperature of austenite-grains will rise. For example, in the case of 0.03 to 004% niobium addition, the coarsening temperature rises by approximately 160°C and reaches 1050°C.
3.The deoxidation power of niobium is comparatively small and it does not show any substantial deoxidation effect upon the molten steel used for this test and other molten steels containing silicon.It is, however, considerably greater than manganese and accordingly, it is supposed that niobium may combine with oxygen which becomes super-saturated with a lowering of the temperature during the process of solidification of steel to precipitate nonmetallic inclusions consisting of various niobium oxides. But, being extremely minute and very small in quantity, such oxides do not exert a great influence on the cleanliness value of steel material as determined by JIS method. The affinity of niobium for carbon and nitrogen is so great that niobium may easily combine with these chemical elements to form carbides and nitrides.
4. The refining phenomenon of austenite-grains is due to the existence of niobium carbides and nitrides in steel material, and the elevation of the coarsening temperature of austenite-grains is the outcome of their growth being restrained by these compounds.
It is due to the existence of various oxides containing niobium precipitated in the molten steel or during the process of solidification that the cast structure of steel becomes refined.
5. By an addition of niobium, the yield point and Charpy impact value of steel material are remarkably improved and the ratio of yield point to tensile strength increases.

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共同研究会製銑部会報告書

鉄と鋼 Vol.49(1963), No.9

製銑

鉄と鋼 Vol.50(1964), No.3

性質

鉄と鋼 Vol.50(1964), No.4

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On the Quenching and Tempering of a Low Cr-Mo Cast Steel

Genjiro MIMA, Toshimi YAMANE

pp. 182-187

抄録

Changes in internal friction at room temperature of a low Cr-Mo alloy steel which has excellent resistance to tempering and low tendency to tempering brittleness were investigated together with changes in mechanical properties and micro-structures.
Internal friction was measured in terms of free decay of transversal resonance vibration which was caused in a specimen by the electro magnetic method.
Experimental results are as follows:
(1) Excellent toughness and smallest value of strain amplitude independent internal friction are observed with specimen tempered at about 700°C after quenching. This is probably due to uniform distribution of fine carbides and pinning-down effects of dislocations.
(2) A martensite structure has not strain amplitude dependent internal friction.

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Spectrophotometric Determination of Manganese in Iron and Steel by Decomposition with Perchloric Acid.

Toshio AMAKI, Toshiro TOMINAGA, Hiroshi KOHARA

pp. 188-195

抄録

As a spectrophotometric method of manganese in iron and steel the (NH₄)₂S₂O₈ method has been mainly adopted.In this method, the sample is decomposed by a mixture of nitric acid, sulphuric acid and, phosphoric acid.
The authors studied the (NH₄) ₂S₂O₈ method using perchloric acidic solution which decomposed the sample. It is said that conversion of Mn⁺² into Mn⁺⁷ by only perchloric acidic solution is commonly unstable.
After studying all kinds of method, authors found this method to be good as far as the amount of perchloric acid in this colored solution is 2 to 10ml.
The features of this method are as follows:
(1) The sample solution is easily converted into Mn⁺⁷ from Mn⁺² by heating in the boiling bath for only 2 to 3 minutes.
(2) Sufficient addition of color reagent is AgNO₃ solution (0.5%) 10ml.and (NH₄)₂S₂O₈ solution (15%) 10ml.and a color develops rapidly.
(3) Color of Mn⁺⁷ is stable for a day.
(4) The sample containing a large amount of nickel, chromium and cobalt can easily be determined, too.

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Beneficiation of Lateritic Iron Ores.

Takashi KOSUGE, Takeo FURUI

pp. 196-204

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Methoden und Ergebnisse einer verfeinerten Konstitutionsforschung

Werner KOSTER

pp. 205-215

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純酸素転炉による高炭素鋼の溶製について

Jo DOI, Katsushige NAGAMI, Kichinosuke MATSUNAGA, Motohiko NAKATANI, Hideo SUGIZAWA, Osamu SAHEKI, Shozo MITSUSIMA, Liich NARITA, Akitu TOMITA, Yoshimasa AOYAMA, Hiroharu Usui, Akira MATSUNAGA, Seiji KOBAYASHI, Takeshi ITAOKA

pp. 216-248

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抄録

pp. 249-251

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共同研究会製銑部会報告書

鉄と鋼 Vol.49(1963), No.9

製銑

鉄と鋼 Vol.50(1964), No.3

性質

鉄と鋼 Vol.50(1964), No.4

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参考文献

pp. 252-254

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鉄鋼ニューズ

pp. 258-259

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22 Dec. (Last 30 Days)

Wettability of CaS against molten iron at 1873 K

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Perspectives on the Promising Pathways to Zero Carbon Emissions in the Steel Industry toward 2050

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Effect of Heating Rate on the Non-Isothermal Hydrogen Reduction of Hematite Pellets

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鉄と鋼 Vol. 50 (1964), No. 2

キーワードランキング

hydrogen reduction of iron ore

gasification

characterization of coal and biomass based on kinetic parameter distributions for pyrolysis

kinetics of decarburization of liquid iron with high concentration ofcarbon

mechanisms of liquefaction and pyrolysis reaction of biomass

hydrogen reduction

steel

19al6mg

automotive wheel

deguchi

鉄と鋼 Vol. 50 (1964), No. 2

技術革新時代におもう

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Speed of Carbon Deposition in Ore Reduction

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On the Rate of Fluidized-Bed Reduction of Iron Ore.

SNSによる共有

Influence of the Ingot Size on Segregation of S in Rimmed Steel Slab Ingots

SNSによる共有

Effects of Niobium on Steel

SNSによる共有

On the Quenching and Tempering of a Low Cr-Mo Cast Steel

SNSによる共有

Spectrophotometric Determination of Manganese in Iron and Steel by Decomposition with Perchloric Acid.

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Beneficiation of Lateritic Iron Ores.

SNSによる共有

Methoden und Ergebnisse einer verfeinerten Konstitutionsforschung

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純酸素転炉による高炭素鋼の溶製について

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抄録

SNSによる共有

参考文献

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鉄鋼ニューズ

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論文アクセスランキング

Wettability of CaS against molten iron at 1873 K

凝固過程における溶鋼中からAl2O3上へのMnSの晶出挙動

Reduction and Melting Behaviors of Iron Oxide Composite with Carbon Deposited Using CO-CO2-H2 Mixed Gas

Perspectives on the Promising Pathways to Zero Carbon Emissions in the Steel Industry toward 2050

In-situ Observation of Precipitation and Growth of MnS Inclusions during Solidification of a High Sulfur Steel

モデル材料を用いた凝固過程における介在物生成挙動のその場観察

Evaluation method for the three-dimensional behavior of bubbles in a liquid metal under horizontal magnetic field using ultrasonic tomography

Effect of Heating Rate on the Non-Isothermal Hydrogen Reduction of Hematite Pellets

Effects of Manganese on Microstructure and Work-hardening Behavior of Low-carbon Lath Martensitic Steel

Chemical and Mechanical Factors on Phosphorus Dissolution Behavior from P-concentrated Slag

詳細検索

凝固過程における溶鋼中からAl₂O₃上へのMnSの晶出挙動

Reduction and Melting Behaviors of Iron Oxide Composite with Carbon Deposited Using CO-CO₂-H₂ Mixed Gas