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鉄と鋼
Vol. 54 (1968), No. 13

鉄と鋼 Vol. 54 (1968), No. 13

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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. 54 (1968), No. 13

随想

河西健一

pp. 1325-1326

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Some Chemical Engineering Aspects of R-H Degassing Process

Hideo WATANABE, Koichi ASANO, Tsuyoshi SAEKI

pp. 1327-1342

抄録

The degassing mechanism in the R-H degassing equipment was investigated by analyzing the degassing action by single bubble as a model, and these results were utilized to estimate the rate of the circulation flow and the decarburizatipn curve.
Of the total volume of CO reaction, one-third occurs within the up-leg and two-thirds within the vacuum chamber. This ratio, however, varies depending on the concentrations of carbon and oxygen in the liquid metal. If the concentrations are rather high, more reaction occurs within the up-leg, while higher ratio of the reaction is noted within the vacuum chamber at lower concentrations.
In deoxidizing low carbon steel, it is necessary to inject a substantial amount of argon in order to attain a below 100ppm level without using any deoxidizing agent. Although the inner pressure fo the vacuum chamber generally has much effect upon the degassing, significant effect is no longer shown at a pressure as low as minus 1 torr. In removing the hydrogen from killed steel, care should be taken to obtain much splash in the vacuum chamber.
The rate of the circulation flow is proportional to the 1·5th power of the inner diameter of the circulation legs and to the 0·33rd power of the argon injection rate. The rate of circulation flow in the treatment of undeoxidized steel attains its maximum when a certain rate of argon injection, which depends upon the leg size, is applied.

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The Effects of Grain Size and Precipitates on Strength of Nb Treated Steels

Yunoshin IMAI, Yoshio SHONO

pp. 1343-1352

抄録

Relationship between the strength and the change of grain size and precipitation behavior of NbC by various heat treatments was examined with pure 0.2% carbon steels containing 0.02-0.09% Nb.
The results were summarized as follows:
1. Though NbC particles precipitated in Nb treated steels tend to coalesce with increase of austenitizing temperature, they remain in steel and prevent the grain coarsening of austenite because of its small solubility and dissolving rate in austenite.
2. The highest strength was obtained when the cooling rate from austenitizing temperature to room temperature was 25°C/min.
When Nb treated steel is continuously cooled after full solution treatment for long time at sufficiently high temperature such as 1250°C, NbC seems to precipitate not only at lower temperatures than A3 point but also at the temperature range of austenite, and the precipitation from austenite will cause less strengthening effect than that from ferrite.
3. Strengthening effect by Nb treatment may be explicable on the assumption that both effects of grain refinement and dispersion of fine particles of NbC are additive; that is, an increase of strength in Nb treated steels austenitized at lower temperatures than about 1050°C is due mainly to refining of ferrite grain size and that at higher temperatures is due mainly to fine precipitation of NbC.

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Effect of Metallographical Factors on the Rolling Fatigue Life of Ball Bearing Steel

Saburo SHIKO, Kazuo OKAMOTO, Shozo WATANABE

pp. 1353-1366

抄録

Effect of metallographical factors on the rolling fatigue life of 1%C-1.5%Cr bearing steel was investigated, and the most profitable component for the bearing life was discussed.
The results obtained are as follows:
(1) Metallographical factors affected on the rolling fatigue life of bearing steel were not amount and size of residual cementite but the chemical compositions soluted in fhe matrix.
(2) The most effective factor affected on the rolling fatigue life was carbon content soluted in the matrix and the most desirable carbon content in the matrix was about 0.5 percent.
(3) It was recognized that the mechanism of flaking was related to the third stage of the tempering of martensite. This was deduced from the observation of the micro-structure of cyclic stressed area by the transmission electron microscopy and the result of bearing life test of a new type steel with higher silicon of which the starting temperature of the third stage was rised by silicon.

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Working Processes of Brittle Materials

Eihachiro TANAKA, Keisuke IKEDA

pp. 1367-1380

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Some Exercises of Thermochemistry and Thermodynamics of Iron and Steel Making

Masayasu OHTANI

pp. 1381-1407

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On Japanese Industrial Standard

Koshiro MIZUNO

pp. 1408-1411

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pp. 1412-1418

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21 Dec. (Last 30 Days)

Wettability of CaS against molten iron at 1873 K

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

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鉄と鋼 Vol. 54 (1968), No. 13

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. 54 (1968), No. 13

随想

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Some Chemical Engineering Aspects of R-H Degassing Process

SNSによる共有

The Effects of Grain Size and Precipitates on Strength of Nb Treated Steels

SNSによる共有

Effect of Metallographical Factors on the Rolling Fatigue Life of Ball Bearing Steel

SNSによる共有

Working Processes of Brittle Materials

SNSによる共有

Some Exercises of Thermochemistry and Thermodynamics of Iron and Steel Making

SNSによる共有

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SNSによる共有

抄録

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論文アクセスランキング

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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

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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

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