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鉄と鋼
Vol. 62 (1976), No. 12

鉄と鋼 Vol. 62 (1976), No. 12

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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. 62 (1976), No. 12

随想

宗像英二

pp. 1475-1476

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The Effect of K₂O, Na₂O and CaO Addition to Fe₂O₃ Single Crystal on Its Reduction

Sogo SAYAMA, Yoshinobu UEDA, Yasunori NISHIKAWA, Yuji YOSHIDA

pp. 1477-1484

抄録

The effect of the presence of K₂O, Na₂O, and CaO in Fe₂O₃ on its reduction behavior was investigated.Platelets of Fe₂O₃ single crystals were prepared by the flux method using Na₂B₁O₇, glass as a flux. The size of the crystals was approx. 3 mm in width and 0.3 mm in thickness. In order to make Fe₂O₃ react with K₂O, Na₂O, and CaO, small amounts of Na₂CO₃, K₂CO₃ and CaCO₃ powders were placed on the flat plane (0001) of Fe₂O₃ and heated at 1100-1300°C in air. It was confirmed by EPMA that reaction products of those substances were formed on some parts of the (0001) plane of Fe₂O₃. The Fe₂O₃, crystals were reduced at 750°C in CO and H₂ streams, and surface structures were observed by SEM. The results obtained were as follows. When alkaline metals (as Na₂O, K₂O) were present in Fe₂O₃, abnormal swelling took place during reduction. It was considered that the swelling was caused by the net effects of (1) cracking of the crystal at early stage of the reduction (2) fibrous iron formation and (3) carbon deposition on the reduced iron. The fibrous iron formation was also observed in the grain boundary of calcium ferrite.

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Gas Flow Patterns and Pressure Profiles in Non-Uniform Packed Beds

Kazuo ARAKI

pp. 1485-1492

抄録

In order to explain the gas flow patterns in nonuniformly packed beds, a theoretical model considering the cross flow effects was developed and exact solutions on gas velocities and pressures were derived
The model was found to satisfactorily represent the experimental results of the pressure profiles in the bed, verifying the validity of this model. Further, it was confirmed that the considerable cross flow was caused in such beds by the axialy nonuniform flow resistance.
Even though observed gas flow patterns neighboring the end of the beds would be similar to those calculated from parallel model, the inner gas flow patterns should be appreciably different from predictions by any noncross flow model as the parallel one. So consequently, special attention should be paid to the fact in experimental investigations of gas flow in nonuniform packed beds.

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The Structure of Molten Alkali-Metal Silicates

Yoshio WASEDA, Hideaki SUITO

pp. 1493-1502

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X-ray diffraction measurements were made on the binary silicate systems Li₂O-SiO₂, Na₂O-SiO₂, and K₂OSiO₂ in the molten and glassy states. From these results, the following facts were quantitativel confirmed; X-ray diffraction patterns of alkali metal silicates in the molten state are similar to those in the glassy state. Molten alkali metal silicates mainly consist of SiO₁., tetrahedral units up to the present experimental composition range i. e., 60 mol% alkali metal oxides. Namely the structural change in the fundamental units due to the addition of alkali metal oxides is not severe. These SiO₄, tetrahedral units, however, distribute randomly with increasing the addition of alkali metal oxides. This is confirmed in the short range order parameter estimated from the pair correlation function.

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Secondary Cooling Pattern for the Prevention of Surface Cracks of Continuous Casting Slab

Tsutomu NOZAKI, Jun-ichi MATSUNO, Kenji MURATA, Hiroshi OOI, Masanori KODAMA

pp. 1503-1512

抄録

In order to prevent surface defects of a continuous casting slab, the most suitable secondary cooling pattern was developed by means of a theoretical calculation and a laboratory scale experiment on the thermal hysteresis similar to those of continuous casting slabs. Moreover, it was considered that thetrans verse corner cracks could be related to the presence of the precipitates which appeared in crystal grain boundaries.
1) Transverse corner cracks are caused by the precipitates of MN which can form on the grain boundary in the austenite region at the temperatures in the range of 700 to 950°C. Especially, the A1N formation is accelerated by reheating below 700°C
2) From the experimental results of roles of secondary cooling patterns and of temperatures at the unbending roll in slabs continuously cast, it is ascertained that the prevention of transverse corner crack is mainly related to the secondary cooling pattern, that is, a good cooling rate is less than 83°C/m in the upper part of continuous casting machine.
3) The newly-developed spray cooling pattern can also give a reduction in the longitudinal surface cracks.

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Asymmetry and Oscillation of the Fluid Flow Pattern in a Continuous Casting Mould: a Water Model Study

ISIJ International Vol.37(1997), No.7

The Technique for High Speed Casting with High Availability in Slab Caster

鉄と鋼 Vol.67(1981), No.8

Cooling Behavior and Slab Surface Quality in Continuous Casting with Alloy 718 Mold

ISIJ International Vol.42(2002), No.10

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Toughness and Ductility of a Characteristic Structure in Isothermally Transformed Molybdenum Steel

Tsuyoshi INOUE, Shushi KINOSHITA

pp. 1513-1522

抄録

Tensile and impact properties have been examined on isothermally transformed plain 0.2%C steel and 0.2%C-0.5%Mo steel with particular attention to a characteristic structure formed in a molybdenum steel.
In a plain carbon steel, ferrite-lamellar pearlite structure is formed over transformation temperatures of 450-680°C, while in a molybdenum steel, divorced pearlite structure with blocky carbides is formed at 600-680°C and bainite structure at 450-550°C.
Lamellar pearlite structures show increasing tensile strengths and decreasing FATT (fracture appearance transition temperature) with decreasing the lamellar spacing, but ductility in tensile tests and shelf energy in impact tests are remained unaffected. With appearance of divorced pearlite in a molybdenum steel, both tensile and impact properties are markedly impaired; tensile strength, ductility, and shelf energy are lowered and FATT is raised.
Detailed observations of ductile fracture processes show that void initiation occurs at smaller strains in the divorced pearlite compared to the lamellar pearlite or bainite structure.
Detrimental effects of the divorced pearlite structure on both impact and tensile properties can be attributed to the large, irregular-shaped carbides in the structure.

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The Sheet Thickness Dependency of Fracture Toughness in High Strength Steels

Keijiro NAKASA, Hideo TAKEI

pp. 1523-1531

抄録

The effect of specimen thickness B on the fracture toughness K_C as well as on the shear lip thickness B_SL of high strength steels was examined to obtain new models for explaining the thickness dependency of K_C, and the influence of tensile properties on the dependency was studied.
The results obtained are as follows.
(1) For each steel, K_C increases with the increase of B in a smaller thickness range where slant fractures occur. In the middle thickness range, however, where fractures of a slant-flat mix mode occur, K_C decreases with the increase of B, and in a larger thickness range where flat fractures predominate, K_C gradually decreases to a constant value (plane strain fracture toughness K_IC).
(2) The shear lip thickness B_SL decreases with the increase of specimen thickness B in the range of the mix mode fracture.
(3) The new models proposed in this study can express the thickness dependency of K_C relatively well.
(4) An approximate relation, B_SL/B=αβ^m_c holds between B_SL/B and the relative plastic zone size β_C (=K²_C/Bσ²_ys, where σ_ys, is yield strength). The exponent m does not much change with materials (m=0.6-1.0), but the coefficient α is dependent on the work hardening exponent n (α≈0.0016/n^1.6).

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Diffusion Layers of Electroplated Nickel on Plane Carbon Steels

Ken OKADA, Shigeomi MATSUMOTO

pp. 1532-1539

抄録

A study has been made of the diffusion behavior of electrodeposited nickel on various plain carbon steels. Influences of carbon contents in the various steels used as substrate, heat treatment temperature and holding time on the structure, composition, hardness are of produced diffusion layer are described.
The results are summerized as follows;
1) The diffusion layer is formed even after heat treatment at a comparatively low temperature such as 600°C.
2) The diffusion occurs by volume diffusion process in the temperature range between 600°C and 800°C, while it occurs by grain boundary diffusion process in the temperature range between 900°C and 1000°C.
3) Some carbides are observed in the diffusion layer, but the kind and type of carbides were not determined by X-ray diffraction in the all steels tested has a comparatively good resistance against nitric acid, and its hardness is as low as 170 in knoop handness.

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Corrosion of Nickel-base Heat Resistant Alloys in Simulated VHTR Coolant Helium at very High Temperatures

Masami SHINDO, Tatsuo KONDO

pp. 1540-1549

抄録

A comparative evaluation was made on three commercial nickel-base heat resistant alloys exposed to helium-base atmosphere at 1000°C, which contained several impurities in simulating the helium cooled very high temperature nuclear reactor (VHTR) environment. The choice of alloys was made so that the effect of elements commonly found in commercial alloys were typically examined. The corrosion in helium at 1000°C was characterized by the sharp selection of thermodynamically unstable elements in the oxidizing process and the resultant intergranular penetration and internal oxidation. Ni-Cr-Mo-W type solution hardened alloy such as Hastelloy-X showed comparatively good resistance. The alloy containing Al and Ti such as Inconel-617 suffered adverse effect in contrast to its good resistance to air oxidation. The alloy nominally composed only of noble elements, Ni, Fe and Mo, such as Hastelloy-B showed least apparent corrosion, while suffered internal oxidation due to small amount of active impurities commonly existing in commercial heats. The results were discussed in terms of selection and improvement of alloys for uses in VHTR and the similar systems.

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Hot Corrosion Behavior of Ni-Cr-W-C Alloys in Impure Helium Gas

Taizo OHMURA, Kensho SAHIRA, Akihiko SAKONOOKA, Noboru YONEZAWA

pp. 1550-1559

抄録

Influence of the minor alloy constituents such as Al, Mn and Si on the hot corrosion behavior of Ni-20Cr-20W-0.07C alloy was studied in 99.995% helium gas at 1 000°C, comparing with that behavior of commercial Ni-base superalloys (Hastelloy X and Inconel 617).
The low oxidizing potential in the impure helium gas usually causes selective oxidation of these elements and the growth of oxide whiskers on the surface of specimen at elevated temperature.
The intergranular attack was caused by selective oxidation of Al, Si and Mn. The spalling of oxide film was restrained by addition of Mn and Si, providing tough spinel type oxide film on the surface and ‘Keyes’ on the oxide-matrix interface respectively.
The amount and the morphology of the oxide whiskers depended on Si and Mn content. More than 0.29% of Si content without Mn always caused the growth of rather thinner whiskers with smooth surface, and the whiskers analyzed by electron diffraction patterns and EPMA to be Cr₂O₃ containing Si. Mn addition changed the whiskers to thicker ones of spinel type oxide (MnCr₂O₁) with rough surface.
On the basis of these results, the optimum content of Al, Mn and Si to minimize the growth of whiskers, the intergranular attack and the spalling of oxide film was discussed.

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Application of Digital Computer to Emission Spectroscopic Analysis

Takanori SUZUKI, Hideo ASAKAWA, Syozo NISHIYAMA

pp. 1560-1566

抄録

Recently, there are the following demands for the analysis word with the intersification of the quality assurance and the cost down.
1. Improvement of analytical precision, from the quality assurance point of view.
2. Time reduction for analysis.
3. Cost down for analysis.
To satisfy these requirements, the utilization of computer was planned for the treatment of emission spectrochemical analysis data, and TOSFAC (T-40C) was set up.After improvements, the practical and highly efficient equipment was developed. Analysis of the data from emission spectrometer, reproduction, evaluation, transmission, registration of the result, and formation of the daily report were made by this equipment.

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Analytical Solution of the Longitudinal Distribution of Wind in Sintering Machine

Takashi MAKINO, Kohei ENDO, Jyuzo SIBATA

pp. 1567-1569

抄録

By classifying the sintering process of ores in some zones (drying, pregeating, combustion, and melting zones), and by assuming the relations of U_i=C_iG (x) and ΔP_i (x) =D_i·G^v(x), and ΔP_tot(x)=const., the wind distribution in a s intering machine was found to be described by the following relation.
This integral equation for G (x) was solved as the following function,
where 1. is the integration constant.
The above solution can be used in many theoretical discussions for he sintering process.

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Recent Progress and Future Innovation of Japanese Iron and Steel Industry

Shinroku YAMASHITA

pp. 1570-1576

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Report of the Plant Engineering Committee of the Joint Research Society of ISIJ

Yasabro YAZAWA, Shyuzo MORIMOTO, Akio SUZUKI, Hiroo OSAKA, Susumu NOMURA

pp. 1577-1586

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The Steel Industry in China

Tanekazu SOMA

pp. 1587-1590

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民族の発展と資材それにおよぼす技術の役割

田畑新太郎

pp. 1591-1592

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pp. 1593-1598

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21 Dec. (Last 30 Days)

Wettability of CaS against molten iron at 1873 K

ISIJ International 早期公開
凝固過程における溶鋼中からAl₂O₃上へのMnSの晶出挙動

鉄と鋼早期公開
Reduction and Melting Behaviors of Iron Oxide Composite with Carbon Deposited Using CO-CO₂-H₂ Mixed Gas

ISIJ International 早期公開
In-situ Observation of Precipitation and Growth of MnS Inclusions during Solidification of a High Sulfur Steel

ISIJ International Vol.64(2024), No.14
Perspectives on the Promising Pathways to Zero Carbon Emissions in the Steel Industry toward 2050

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

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

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

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鉄と鋼 Vol. 62 (1976), No. 12

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. 62 (1976), No. 12

随想

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The Effect of K2O, Na2O and CaO Addition to Fe2O3 Single Crystal on Its Reduction

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Gas Flow Patterns and Pressure Profiles in Non-Uniform Packed Beds

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The Structure of Molten Alkali-Metal Silicates

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Secondary Cooling Pattern for the Prevention of Surface Cracks of Continuous Casting Slab

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Toughness and Ductility of a Characteristic Structure in Isothermally Transformed Molybdenum Steel

SNSによる共有

The Sheet Thickness Dependency of Fracture Toughness in High Strength Steels

SNSによる共有

Diffusion Layers of Electroplated Nickel on Plane Carbon Steels

SNSによる共有

Corrosion of Nickel-base Heat Resistant Alloys in Simulated VHTR Coolant Helium at very High Temperatures

SNSによる共有

Hot Corrosion Behavior of Ni-Cr-W-C Alloys in Impure Helium Gas

SNSによる共有

Application of Digital Computer to Emission Spectroscopic Analysis

SNSによる共有

Analytical Solution of the Longitudinal Distribution of Wind in Sintering Machine

SNSによる共有

Recent Progress and Future Innovation of Japanese Iron and Steel Industry

SNSによる共有

Report of the Plant Engineering Committee of the Joint Research Society of ISIJ

SNSによる共有

The Steel Industry in China

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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

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

The Effect of K₂O, Na₂O and CaO Addition to Fe₂O₃ Single Crystal on Its Reduction

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