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鉄と鋼
Vol. 55 (1969), No. 7

鉄と鋼 Vol. 55 (1969), No. 7

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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

21 Dec. (Last 30 Days)

鉄と鋼 Vol. 55 (1969), No. 7

随想

池上平治

pp. 537-538

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Electric Conductivity of Liquid PbO-SiO₂, PbO-GeO₂, PbO-P₂O₅, PbO-B₂O₃ PbO-SiO₂-GeO₂Systems

Hiroshi SAITO, Kazuhiro GOTO, Mayumi SOMENO

pp. 539-549

抄録

The electric conductivity of liquid PbO-SiO₂, PbO-GeO₂, PbO-P₂O₅, PbO-B₂O₃ and PbO-SiO₂-GeO₂ systems have been measured at the frequency of 1000c/sec. The conductivity of each system increases as the temperature increases. The Arrhenius type plots show a linear relationship and the activation energies for the binary systems range from 7.7 to 9.8kcal/mol at the composition of 90 mol% PbO. The activation energies for electric conduction increase and the conductivities decrease with increasing acid oxide concentration. The variations of the conductivity by acid oxide concentration is suggested to be due to change of the fraction of anionic species in the melts. Ionic distribution for the system PbO-SiO₂ was calculated by the equations proposed by C. R.. MASSON and the relations with the conductivity have been discussed. On the assumption that Pb²⁺ is the sole carrier of electric conduction, the contribution of the mobility of Pb²⁺ to the conduction is supposed to be larger than that of the number of Pb²⁺ ions.

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On the Deoxidation of Liquid Iron with Silicon

Rokuro SAKAGAMI, Chitoshi KAWASAKI, Iseko SUZUKI, Keiji SATO

pp. 550-575

抄録

The mechanism on the deoxidation of liquid iron with Si was studied on the basis of the various facts obtained by the experiments A, B, and C.
Experiment A; An investigation was made on the change of the oxygen content in liquid iron and the shape and the size distribution of the inclusion, after addition of metallic Si.
Experiment B; The process of growth and the composition of the deoxidation products were studied, after the prompt and homogeneous dissolution of deoxidizer Si or Si-Al.
Experiment C; The mechanism of dissolution of oxygen from the SiO₂ crucible into liquid iron was studied.
The results obtained were summarized as follows.
1) The formation of SiO₂ is not completed immediately after addition of Si and consequently the supersaturation in liquid iron occurs until the equilibrium is reached.
2) It was concluded that the growth of the oxide particle or the deoxidation reaction was not controlled by the diffusion of the solute atom, but the reaction rate at the particle surface, and in general the local equilibrium was not maintained there even at steelmaking temperature.
3) The ratio of the rate constant for the reaction Si+2O→SiO₂, 2Al+3O→2Al₂O₃ was estimated by means of the composition of the products obtained by the Si-Al deoxidation in the experiment B. The ratio was constant in a wide range of the concentration of aluminium, silicon and oxygen in liquid iron.
4) In the experiment A, the greater part of the primary inclusion floats out rapidly and the total oxygen agrees nearly with the dissolved oxygen 5 minutes after addition of silicon.
5) The mechanism on the formation of the inclusion during solidification was discussed from the point of view of nucleation and growth of the oxide particle.

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Influence of Hydrogen on Stress Corrosion Behavior of Austenitic Stainless Steel

Ryohei TANAKA, Kyuya NAGASAKI, Tinkwei Hsu

pp. 576-588

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In order to investigate the behaviors of hydrogen embrittlement and stress corrosion cracking in austenitic stainless steel, the change in ductility of 18Cr-8Ni steel under various environments was studied chiefly by means of 180°repetition bending test.
The main results obtained are as follows:
(1) The hydrogen embrittlement in austenitic stainless steel was determined sensitively by the bending test after pickling and electrolysis.
(2) It was found that the steel also embrittled during stress corrosion test in boiling 42 percent magnesium chloride solution and took a process analogous to that of hydrogen embrittlement by pickling and electrolysis.
(3) The hydrogen occlusion owing to various environments occured only near the surface layer, and the recovery of ductility was limited at the initiation period of the embrittlement and the longer exposure time made the more embrittlement.
(4) It was concluded that the hydrogen embrittlement plays an important role in the formation of the susceptible paths for the stress corrosion cracking of austenitic stainless steel.

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On Metallurgical Reaction in Arc Welding of Steel

Eiiti TSUNETOMI

pp. 589-603

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Stress Corrosion Cracking of Stainless Steels

Saburo SHIMODAIRA

pp. 604-627

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Application of Gas Chromatograph in Iron-and Steel-Making

Keiji YOKOMIZO

pp. 628-639

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pp. 640-646

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論文アクセスランキング

21 Dec. (Last 30 Days)

Wettability of CaS against molten iron at 1873 K

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

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鉄と鋼 Vol. 55 (1969), No. 7

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. 55 (1969), No. 7

随想

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Electric Conductivity of Liquid PbO-SiO2, PbO-GeO2, PbO-P2O5, PbO-B2O3 PbO-SiO2-GeO2Systems

SNSによる共有

On the Deoxidation of Liquid Iron with Silicon

SNSによる共有

Influence of Hydrogen on Stress Corrosion Behavior of Austenitic Stainless Steel

SNSによる共有

On Metallurgical Reaction in Arc Welding of Steel

SNSによる共有

Stress Corrosion Cracking of Stainless Steels

SNSによる共有

Application of Gas Chromatograph in Iron-and Steel-Making

SNSによる共有

抄録

SNSによる共有

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

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

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

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

Transition behavior of gas containing suspension from solid-like to liquid-like flows

A hot rolling full process rolling force prediction method based on transfer learning and Inception-LSTM neural network

Slag-steel reactions in the refining of Advanced High-Strength Steel

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

詳細検索

Electric Conductivity of Liquid PbO-SiO₂, PbO-GeO₂, PbO-P₂O₅, PbO-B₂O₃ PbO-SiO₂-GeO₂Systems

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