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Tetsu-to-Hagané
Vol. 51 (1965), No. 2

Tetsu-to-Hagané Vol. 51 (1965), No. 2

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ONLINE ISSN:	1883-2954
PRINT ISSN:	0021-1575
Publisher:	The Iron and Steel Institute of Japan

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Keyword Ranking

21 Nov. (Last 30 Days)

Tetsu-to-Hagané Vol. 51 (1965), No. 2

随想

不破祐

pp. 161-162

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随想

Bibtex

Ris

Effects of Nickel, Cobalt, Tungsten, Molybdenum, Chromium and Tin on the Activity Coefficient of Oxygen in Liquid Iron

Sachio MATOBA, Takeshi KUWANA

pp. 163-169

Abstract

The equilibrium of oxygen in liquid iron with H₂-H₂O mixtures has been studied at 1550°C, 1607°C and 1663°C respectively.
Effects of nickel, cobalt, tungsten, molybdenum, chromium and tin on the activity of oxygen in liquid iron have been studied at 1600°C.
The data obtained are summarized as follows:
1. H₂+O=H₂O
log K₁[=P_H₂O/P_H₂·a₀]=7, 480/T-3.421
ΔF⁰₁=-34, 220+15.65T
2. The interaction parameter of oxygen in liquid iron, e′₀:
e′₀[=∂log f′₀/∂[%O]]=-10, 130/T+4.94
3. The effects of alloying elements on the activity coefficient of oxygen in liquid iron:
e^(Ni)₀=∂log f^(Ni)₀/∂[%Ni]=+0.0053 Ni<40%
e^(Co)₀=∂log f^(Co)₀/∂[%Co]=+0.0080 Co<40%
e^(W)₀=∂log f^(W)₀/∂[%W]=+0.0117 W<20%
e^(Mo)₀=∂log f^(Mo)₀/∂[%Mo]=+0.0117 Mo<10%
e^(Cr)₀=∂log f^(Cr)₀/∂[%Cr]=+0.0117 Cr<12%
e^(Sn)₀=∂log f^(Sn)₀/∂[%Sn]=+0.0117 Sn<14%

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Effects of Nickel, Cobalt, Tungsten, Molybdenum, Chromium and Tin on the Activity Coefficient of Oxygen in Liquid Iron

Bibtex

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The Deoxidation by Metal-(Acidic or Basic) Slag Reactions

Nobuo SANO, Sumio SHIOMI, Yukio MATSUSHITA

pp. 170-185

Abstract

The mechanisms of deoxidation utilizing the potential difference of oxygen between metal and acidic or basic slag and of other accompanying reactions were intended to be solved.
At first oxygen, manganese and silicon transfer rates between iron bath and MnO-FeO-SiO₂ ternary slag saturated with silica were measured. Then the reactions between such slags and iron bath which previously contained manganese and silicon to confirm the existence of quasi-equilibrium states were investigated.
The obtained results were discussed with the unsteady diffusion equations and rate determining steps were worked out by experimental results and calculations.
The conclusions are as follows:
1) The deoxidation rate would be mainly controlled by the transfer rate of oxygen from iron bulk to the interface but the resistance of slag to the diffusion of oxygen could not be neglected.
2) The dissolution rate of manganese oxide might be controlled by the diffusion of manganese from the interface to iron bulk.
3) Addition of lime to those ternary slags increased the dissolution rate of manganese oxide but decreased the deoxidation rate.
4) Quasi-equilibrium states, in other words, minimum or maximum values of some components wefe observed.
For the experiments using basic slags the authors developed lime crucibles utilizing appropriate amount of titanium oxide as binder in order to keep both phases, slag and metal. Because of some failures in making crucibles, attention was mainly paid to the transfer rate of manganese between metal and slag.
According to the obtained results:
1) The deoxidation is a little faster than in case of acidic slag because of difference of slag constitutions.
2) The dissolution rate of manganese oxide would be controlled by the diffusion of manganese ion.
3) Silicon in iron bath increases the dissolution rate of manganese oxide.
4) The rate of elimination of manganese in iron bath by iron oxide of slag could be controlled by the diffusion of manganese in iron bath.
5) Manganese transfer between iron bath and magnesium oxide bearing slag is much slower than in case of lime bearing slag.

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The Deoxidation by Metal-(Acidic or Basic) Slag Reactions

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Study on the Behavior of Nonmetallic Inclusions in High Carbon Chromium Steel.

Kazuteru SENDA

pp. 185-217

Abstract

Nonmetallic inclusions formed in high carbon chromium steel were classified into microscopic and macroscopic ones. The behavior of their formation was studied.
The results are summarized as follows:
1. During solidification of steel, oxides and sulfides which have been dissolved in melt as oxygen and sulfur, are almost precipitated, forming microscopic inclusions. Inclusions produced in melt float up and are excluded rapidly.
2. In solid steel, oxygen can not virtually be dissolved and remains as oxide. Consequently the amount of oxide inclusions increases approximately in proportion to the oxygen content in steel.
3. Although the amount of sulfide inclusions increases according to the total amount of sulfur, they can be partially dissolved in steel. Therefore the amount of sulfide inclusions is also dependent on the amount of sulfur dissolved in solid steel. Sulfur content in steel is very effective for the cleanliness of steel.
4. When microsegregation degree of steel is decreased, the amount of sulfur dissolved in solid steel is increased. Therefore the amount of sulfide inclusion is decreased.
5. When molten steel containing much oxygen is killed with aluminum, cloudlike inclusions are produced. Relation among these inclusions, various melting and casting conditions, and microsegregation is investigated.
It is shown that alumina type inclusions are also precipitated during solidification of steel, and that these inclusions produced in molten steel are separated rapidly. In spite of containing much aluminum, oxygen can be dissolved in molten steel super saturatedly.
6. The melting condition for occurrence of B-type inclusions in killed steel is experimentally examined. Addition of aluminum, enrichment of oxygen and holding of molten steel are needed for occurrence of B-type inclusion. These conditions may be attributed to oxidation of aluminum in molten steel.
7. By analyzing the type of length distribution of inclusions found in steel parts, it is suggested that macroscopic inclusion is not a large inclusion which has grown up accidentally, but another type inclusion is produced under a particular condition.
8. Experimentally, macroscopic inclusion can be intentionally produced by promoting air oxidation of molten steel in teeming process. Accordingly, teeming in argon atmosphere was effective for preventing the occurrence of macroscopic inclusions. Air oxidation of molten steel by carrying air bubbles down into the molten steel in mold has much effect on the occurrence of macroscopic inclusions.
9. It is shown that there is another unknown factor for occurrence of macroscopic inclusions appearing through a certain teeming process, accompanied with air oxidation of molten steel.
10. Large inclusions adjacent to pinhole and blowhole, and B-type inclusions are regarded as a factor influencing the occurrence of macroscopic inclusions in special cases.

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Study on the Behavior of Nonmetallic Inclusions in High Carbon Chromium Steel.

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Effects of Stirring on the Rates of Dissolution of Steel in Liquid Al or Zn.

Mineo KOSAKA, Susumu MINOWA

pp. 218-225

Abstract

The rates of dissolution V of rotated steel rods (2-10mm ƒ) in molten Al (775°C), Zn (600°C) were measured.
Experimental results were examined in the light of diffusion theory and it was found as follows:
1) At the lower stirring speed (Re<5×10²), the rate controlling mechanism of the dissolution is Fe-diffusion in liquid metals and the obtained data can be correlated to the formula:
_??_
2) At the higher stirring speed (Re<10³), the rate controlling mechanism of the dissolution depends on both processes i.e. Fe-transfer from solid alloy surface to liquid metal and Fe-diffusion in liquid metal, simultaneously.
So, above equation is not applicable to these high stirring conditions.

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Effects of Stirring on the Rates of Dissolution of Steel in Liquid Al or Zn.

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Application of Gas-Chromatography to the Furnace Atmosphere Gases.

Akira ADACHI, Nobuya IWAMOTO, Isao MIYAWAKI

pp. 226-231

Abstract

It has been recognized that the protective atmosphere, such as RX or DX gas, is necessary to prevent the oxidation and decarburization of steels under heat treatment.
Previously, we have used the popular analysing instruments, viz. Orsat's and dew point apparatus, though the quantitative and qualitative analysis of the specimens containing hydrocarbons was difficult and time-consuming by them.
Gas chromatography possesses inherent advantages that make it particularly favourable for the characterization and quantitative analysis of complex mixtures.
In addition to providing a direct method of analysis for unknown specimens, it has proved to be a powerful adjunct to ultraviolet, infrared and spectroscopic techniques.
From the preliminary experiment, we found silica gel and molecular sieve to be moderate column packings for our objects.
But, it was necessary to know the reliability of this application. So, we analyzed the results by simple statistical treatment.
From the results obtained in the analysis of RX gas, it was concluded that
1) accuracy of results depends upon sample size, and the smaller the sample size, the better;
2) the results obtained from oxygen, carbon monoxide and methane have 95% confidence coefficient and±10 mm² accuracy of profile area in the case of 1 to 5 times repetition but the results from carbon dioxide, nitrogen and hydrogen are worse; and
3) the carrier gas flow rate from 25 to 30 ml/min. is appropriate to this study.

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Application of Gas-Chromatography to the Furnace Atmosphere Gases.

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パネル討論会報告

Yoshio SHIRAISHI, Akimitsu OKURA, Yukio MATSUSHITA, Akitoshi ISHIMITSU, Kinichi SUGAWARA, Kazuo KUNII, Reijiro NISHIDA, Yasuo KAMATA, Hisamitsu HARADA, Yoshikazu KATSUMATA, Takeshi NONOMURA, Mitsuhiro AWAJI, Dr.Shojiro WATANABE, Yasumoto OTAKE, Tomohiro HASEGAWA, Hidetaro NEMOTO, Eichi SAKAMOTO, Koichi KURODA, Genji NAKATANI, Ryuichi NAKAJIMA

pp. 232-268

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パネル討論会報告

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Standardization of the Multiple Type Creep Tester Research Project in 1962.

Shuji TAIRA

pp. 269-285

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Standardization of the Multiple Type Creep Tester Research Project in 1962.

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For the Growth of the Mechanics of Oxide Inclusion at the Addition of Chromium.

Yasushi KOJIMA, Kiichi TAKAHASHI, Hiroshi SAKAO, Kokichi SANO

pp. 286-287

Abstract

It is wellknown that chromium has a quality as deoxydation reagent within its concentration in the liquid metal up to 3%.
Using X-ray microanalyzer, authors measured the process of the growth of oxide inclusion which was produced by deoxydation reaction at the process of the dissolving of metallic chromium. The result shows that it takes much time for the growth of chromic oxide compared with other reactions.

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Tetsu-to-Hagané Vol.49(1963), No.2

On the Behavior of Several Kinds of Oxide Inclusion in Steels during Hot-rolling

Tetsu-to-Hagané Vol.54(1968), No.9

Effect of Alloying Elements on Interfacial Tension between Molten Steel and Slag

Tetsu-to-Hagané Vol.53(1967), No.7

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For the Growth of the Mechanics of Oxide Inclusion at the Addition of Chromium.

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抄録

pp. 288-290

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抄録

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参考文献

pp. 291-292

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参考文献

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鉄鋼ニューズ

pp. 296-297

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Tetsu-to-Hagané Vol. 51 (1965), No. 2

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kinetics of decarburization of liquid iron by

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Tetsu-to-Hagané Vol. 51 (1965), No. 2

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Effects of Nickel, Cobalt, Tungsten, Molybdenum, Chromium and Tin on the Activity Coefficient of Oxygen in Liquid Iron

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The Deoxidation by Metal-(Acidic or Basic) Slag Reactions

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Study on the Behavior of Nonmetallic Inclusions in High Carbon Chromium Steel.

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Effects of Stirring on the Rates of Dissolution of Steel in Liquid Al or Zn.

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Application of Gas-Chromatography to the Furnace Atmosphere Gases.

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パネル討論会報告

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Standardization of the Multiple Type Creep Tester Research Project in 1962.

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For the Growth of the Mechanics of Oxide Inclusion at the Addition of Chromium.

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抄録

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参考文献

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鉄鋼ニューズ

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Article Access Ranking

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

Measurement of Bubble Size Distribution and Generation Position of Bubbles Generated during Smelting Reduction of Iron Oxide-containing Slag

Injection of hydrogenous gases into the blast furnace tuyeres for reducing CO2 emissions: a review

Development of a Low-carbon Sintering Process Technology and Its Application to a Pilot-scale Sintering Testing

Precipitation Behavior of MnS from Molten Iron to Al2O3 during Solidification

Molecular dynamics simulation of viscosity of the CaO, MgO and Al2O3 melts

Effect of Al Content on Precipitation Behavior of AIN Inclusions during Unidirectional Solidification Process of Fe-(0.5-2.0)%Al-2.0%Mn Alloys

Quantitative Understanding of Solute Concentration Distribution by Microsegregation During Solidification

SOKD: A soft optimization knowledge distillation scheme for surface defects identification of hot-rolled strip

Reduction and Carburization Behaviors of Iron Oxide Composite with Iron Carbide and Free Carbon

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Injection of hydrogenous gases into the blast furnace tuyeres for reducing CO₂ emissions: a review

Precipitation Behavior of MnS from Molten Iron to Al₂O₃ during Solidification

Molecular dynamics simulation of viscosity of the CaO, MgO and Al₂O₃ melts