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Tetsu-to-Hagané
Vol. 46 (1960), No. 6

Tetsu-to-Hagané Vol. 46 (1960), No. 6

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

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21 Nov. (Last 30 Days)

Tetsu-to-Hagané Vol. 46 (1960), No. 6

就任に当つて

浅田長平

pp. 641-642

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就任に当つて

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Ris

On the Carbon and Heat Consumption in Blast Furnace

Takeo Yatsuzuka, Jun Sawamura, Susumu Ota, Takahiro Fukuda

pp. 643-652

Abstract

The consumption of carbon and the heat in an operating blast furnace constitutes a basic factor for a theoretical evaluation of the pig-iron manufacturing operation, together with the material consumption.
This report gives the result of studying how the carbon consumption is performed in each part of a blast furnace, how the calory thus generated is distributed and to what extent the calory consumption of charged materials will amount, referring also to the application of those results to the blast furnace operation based on the studies from both theoretical and practical aspects.

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On the Carbon and Heat Consumption in Blast Furnace

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On the Sulphurization of Cast Iron at High Temperatures

Hiroshi Nakai

pp. 652-657

Abstract

Experiments on the sulphurization of cast iron in H₂S gas current at high temperatures were conducted and the following results were obtained.
(1) The sulphurization product of cast iron was composed of pyrrhotite Fe_1-xS and pyrite FeS₂, which were the same as those of iron and steel. In the outer layer of sulphurization product, carbon and phosphor didn't diffuse, on the contrary manganese diffused freely, silicon did a little.
(2) The sulphurization rate was controlled by the parabolic rate law, and the following formula was obtained:
W²=1.15×10^-6t
W: sulphurization rate, g/cm²
t: sulphurization time's
(3) Between the sulphurization rate and temperature, the exponential law was found and the following formula was obtained.
K=10^-2·e^-33500/RT
K: sulphurization rate constant, (g/cm²) ²/s
R: gas constant
T: sulphurization temperature, °K
(4) The structure of cast iron did not affect the sulphurization rate.
(5) Carbon expedited the sulphurization rate of cast iron, on the contrary silicon and manganese did not expedite it.

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On the Sulphurization of Cast Iron at High Temperatures

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Continuous Cooling Transformation Diagrams for Welding of Mn-Si Type 2H Steels

Harujiro Sekiguchi, Michio Inagaki

pp. 657-665

Abstract

The authors performed a series of researches on continuous cooling transformation diagrams of structural steels used for welding and reported them successively in Journal of Japan Welding Society (1957-1959, vols. 26-28). In these reports, the continuous cooling transformation diagrams were obtained with small specimens in the case of rapid-heating to maximum temp. 1350°C, cooling by various processes immediately after reaching its temp. and without holding at its temp. They gave fundamental data for tha sake of selecting the weldable steels and determined the conditions when welding these steels. Therefore, such continuous cooling transformation diagrams were presumed very important and useful.
In the hresent report, on the basis of the results of the above researches, further determinations were made on the continuous cooling transformation diagrams for high tensile steels 2H which were of Mn-Si type and showed the tensile strength enhanced to about 60kg/mm² by the heat-treatment of water-quenching and tempering.
For those 2H steels could be adopted also, a diagram that was plotted to show the relation between critical cooling-time C_z', C_f' or 50% martensite cooling-time and the carbon equivalent of mild steels and Mn-Si type high tensile steels as rolled or normalized. And then, using this diagram the critical cooling-time C_z', C_f' and 50% martensite cooling-time and the carbon equivalent were determined with mild steels and Mn-Si type high tensile steels as rolled or normalized And then, based on this diagram the critical cooling-time C_z', C_f' and 50% martensite cooling times of arbitrary steel grades could be predicted from the carbon equivalent C_eq= (C+1/12Mn+1/24Si) % of those steels.
Next, the various types of high tensile steel having 60kg/mm² tensile strengths were compared with each other, From stand points of the buctility and crack-sensitivity of the weld heat affected zone, the critical cooling-time C_f' which began to reveal existance of primary ferrite was important, and the steels having smaller value of C_f' were found desirable. For this purpose, even with any type of steels, it was necessary that the carbon content of a steel was lowered to a mimimum.

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Tetsu-to-Hagané Vol.43(1957), No.5

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Continuous Cooling Transformation Diagrams for Welding of Mn-Si Type 2H Steels

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On the Carbide Precipitation by Heating in Solution-Treated High-Manganese Steel

Yunoshin Imai, Toshio Saito

pp. 665-673

Abstract

Carbide precipitations in isothermal and continuous heated Hadfield steel after solution-treatment were studied. Results obtained were as follows:
1) Solution-treateds steel precipitated primary carbide isothermally in accordance with an C-curve which has the nose at about 650-700°C, and also precipitated secondary pearlitic constituent isothermally with an C-curve which has the nose at about 600°C
2) At the primary stage, carbide films were formed at austenitic grain boundary. In the low temperature range, carbide film formations were delayed markedly, and then, platelet carbide were formed along the cleavage plane of grains. In the high temperature range, carbide films changed to granular particles and gradually takes coherent shapes.
3) The nucleations of pearlitic constituents were most rapid at about 600°C, but growth velocities of pearlite has max. value at about 500°C.
4) Secondary precipitates, pearlitic constituents, were very fine lamellar pearlite, and lower temperature precipitates has finer lamellar than precipitates at higher temperature.
5) In continuous heating, steels precipitated boundary carbides, platelet carbides and pearlitic constituents at about 500-600°C. It suggested that no pearlites were precipitated when heated at a velocity of above about 15°C/mn and also no carbides were precipitated when heated at a velocity of above about 45°C/mn.
6) Mechanical properties were injured by heating at above about 350°C, since platelet carbide precipitations began at that temperature. Tensile strength lowered to minimum value at 750°C, since carbide films markedly grew at that temperature, and impact value, elongation and reduction fo area lowered to minimum value at pearlite precipitation range. Increased hardness were mainly affected by platelet carbide precipitations.

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On the Carbide Precipitation by Heating in Solution-Treated High-Manganese Steel

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Effect of Ti, Al, C and Mo on Mechanical Properties of M252

Taro Hasegawa, Osamu Ochiai

pp. 673-677

Abstract

Effects of Ti, Al, C and Mo contents on stress-rupture properties of alloy M252 were investigated.
There seemed to be a peak stress-rupture life at 1.2% Al when Ti was 3.1%, and stress-rupture life was decreased in the case of specimens containing over 1.2% Al. Ti+Al atm. %=6.5 gave the peak of stress-rupture and creep ductility.
Effect of Ti and Al on stress-rupture characteristics was clear in the case of heat treatment B (1065°C×8h W.Q., 800°C×2.5h A.C. and 700°C×18h A.C.) but it was not clear in the case of heat treatment G (1065°C×8h. A.C., 760°C×15h. A.C.).
Carbon did not affect the short-time stress-rupture test, but it did so in the long time stress rupture test, and stress rupture life was decreased by the increase of carbon. Hardness after heat treatment was increased by carbon and nitrogen, but it seemed that overaging at high temperature was promoted by them and the decrease of long time stress rupture life was affected by overaging.
Ultimate strength of short-time tensile test between room temperature and 750°C, and stress-rupture strength less than 500 hours of the alloy containing 11% Mo was higher than those of the alloy containing 10% Mo. But strength was not increased by increasing Mo content up to 15%, although these values were higher than the alloy containing 10% Mo. The effect of Mo on increasing strength of alloy was not clear in the case of testing temperature of 816 and 850°C.
There was no embrittling effect by increasing Mo content in these test. But the net work which precipitates at grain boundaries was increased by heating 11% Mo alloy for 1000 hours at 850°C, and it lowered Charpy's impact value.
The resistance to oxidation in the air below 900°C was good enough, and it was not affected by increasing the Mo content.

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Effect of Ti, Al, C and Mo on Mechanical Properties of M252

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Rapid Determination of Sulphur in Basic Slags by Combustion Method

Shizuya Maekawa, Yoshio Yoneyama

pp. 678-682

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In case of trying to decompose sulphide in basic slags by means of the electric resistance heating furnace, the authors have sometimes failed to release and recover it as SO₂. It took a many time especially the high basic sample because of the strong affinity of sulphur to its matrix. So, they used the high frequency induction heating combustion apparatus to decompose the sample with pure iron in O₂ flow. Consequently, sulphur was completely decomposed and released in the flow out gas, as SO₂, which was absorbed into H₂O and caught as H₂SO₃.
Then, HC1 and starch solution were added in the absorbed water and titrated by M/1000 KIO₃.
The influence of pH, aquous temperature, combustion time and O₂ flow upon SO₂ yields were also examined. The combustion was over in 3mn. and 94% of sulphur was recovered with the aid of one absorption bottle, and 97%, two bottles. The authors examined the behavior of sulphur on the synthetic sample prepared by sulphide, sulphate and etc., and comfirmed that even high contents sample of 1% sulphur could be recovered almost stoichiometrically.
Analytical time is about 8mn. for one sample.

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Rapid Determination of Sulphur in Basic Slags by Combustion Method

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Oxygen Process for Iron and Steel Making (I)

Kozo Morinaga

pp. 683-700

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Oxygen Process for Iron and Steel Making (I)

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Development Trends in Metalic Science of Special Steels in Recent Years

Herbert Briefs

pp. 701-710

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Development Trends in Metalic Science of Special Steels in Recent Years

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pp. 711-721

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pp. 722-726,622

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第59回講演大会見学会見学記

pp. 727-730

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第59回講演大会見学会見学記

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鉄鋼ニューズ

pp. 731-732

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鉄鋼ニューズ

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特許記事

pp. 735-736

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Tetsu-to-Hagané Vol. 46 (1960), No. 6

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Tetsu-to-Hagané Vol. 46 (1960), No. 6

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On the Carbon and Heat Consumption in Blast Furnace

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On the Sulphurization of Cast Iron at High Temperatures

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Continuous Cooling Transformation Diagrams for Welding of Mn-Si Type 2H Steels

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On the Carbide Precipitation by Heating in Solution-Treated High-Manganese Steel

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Effect of Ti, Al, C and Mo on Mechanical Properties of M252

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Rapid Determination of Sulphur in Basic Slags by Combustion Method

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Oxygen Process for Iron and Steel Making (I)

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Development Trends in Metalic Science of Special Steels in Recent Years

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座談会

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抄録

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第59回講演大会見学会見学記

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鉄鋼ニューズ

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特許記事

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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