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74 巻, 9 号
選択された号の論文の23件中1～23を表示しています
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萬谷 志郎, 日野 光兀1988 年 74 巻 9 号 p. 1701-1711
発行日: 1988/09/01
公開日: 2009/05/29
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馬場 宣良1988 年 74 巻 9 号 p. 1712-1720
発行日: 1988/09/01
公開日: 2009/05/29
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八木澤 猛1988 年 74 巻 9 号 p. 1721-1726
発行日: 1988/09/01
公開日: 2009/05/29
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田谷 稔1988 年 74 巻 9 号 p. 1727-1733
発行日: 1988/09/01
公開日: 2009/05/29
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桑原 守, 磯部 浩一, 三尾 圭右, 鞭 巖1988 年 74 巻 9 号 p. 1734-1741
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーThe characteristics of burden flow in blast furnace is discussed based on both theoretical analyses and observations in two types of cold model experiments with gas blowing. Sublimation of dry ice particles is utilized in the experiments to simulate coke combustion before tuyeres or the volume reduction of cohesive layers in blast furnace.
Experimentally observed profile of deadman, which is formed just behind the raceway, is shown to be in good agreement with a slip line calculated for the passive stress state. Theoretical height of the deadman is increased by decreased angle of internal friction and increased angle of wall friction.
The burden flow in the shaft is approximately described by a potential flow theory taking account of the volume change of burden. Below the lower end of the shaft, however, the viscous flow analysis gives more realistic flow field presumably due to the prevailing passive stress state.抄録全体を表示PDF形式でダウンロード (4961K) -
出口 幹郎, 森 利治, 宇野 孝二, 田中 孝三, 田村 節夫1988 年 74 巻 9 号 p. 1742-1749
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーFor the purpose of utilization of the residual oil as a new energy resource for ironmaking, the development of an injecting technique of petroleum coke-oil slurry into a blast furnace was undertaken. In order to establish this technique, the method of uniform injection of the slurry through the tuyeres was studied by the use of the pilot plant with a circulating loop. The petroleum cokes used in this study were the delayed coke and the fluid coke. This development was followed by the demonstration plant test at No. 1 blast furnace of Kobe Works which was provided with the new injection system designed on the basis of pilot plant test results. This slurry injection test through 4 tuyeres was carried out for about 4 months.
As a result, it was confirmed that the continuous injection of 50% slurry without additives was possible for a long period of time as easily as heavy oil and the errosion of pipelines was not a problem practically. The most important result for blast furnace operation was that the new injection system with a circulating loop made possible a uniform injection of slurry through each tuyere.抄録全体を表示PDF形式でダウンロード (4584K) -
出口 幹郎, 笹原 茂樹, 葛西 丈次, 田中 孝三, 田村 節夫1988 年 74 巻 9 号 p. 1750-1757
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーFor the purpose of utilization of the residual oil as a new energy resource for ironmaking, the development of an injection technique of petroleum coke-oil slurry into a blast furnace was undertaken. The slurry injection test through 4 tuyeres of No. 1 blast furnace at the Kobe Works was carried out for about 4 months. At the same time, the development of probe at the tuyere level was undertaken to study the combustibility of the slurry in the raceway. The petroleum cokes used in this study were the delayed coke (DC) and the fluid coke(FC).
As a result, it was confirmed that gas sampling, unburnt fuel sampling, and temperature measurement in the raceway were possible, and that the combustibility of the slurry could be evaluated on the basis of these results. It was made clear that the combustibility became worse in the following order, heavy oil, DC-slurry, and FC-slurry. However, the slurry injecton had no harmful influence on blast furnace performance. The replacement ratio of coke/slurry was about 1.0. Consequently, it was concluded that the slurry could be used as a substitute fuel for heavy oil.抄録全体を表示PDF形式でダウンロード (4677K) -
早稲田 嘉夫, 上埜 修司1988 年 74 巻 9 号 p. 1758-1764
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーA theoretical equation for the interaction parameters in multi-component metallic solutions has been recently presented by the pseudopotential formalism for the free energy with the free energy of the hard sphere model. By applying this new theoretical equation, numerical calculations were made on 280 cases in iron-base solutions closely related to steelmaking and the agreement between calculation and the available experimental data appears to be at the reasonable level with 90% reliability of agreement in sign. It was also appreciated for the hard sphere term that the product of the difference in the hard sphere diameters between solvent and solute plays a significant role in determining the sign and absolute values of the interaction parameters.抄録全体を表示PDF形式でダウンロード (1188K) -
井上 亮, 張 顕鵬, 李 宏, 水渡 英昭1988 年 74 巻 9 号 p. 1765-1769
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーMgO飽和FetO-SiO2-NbOx-MnO-P2O5系スラグ-溶鉄間のNb,P,Mnの分配平衡実験を1600℃で行い以下の結果を得た.
1)スラグ-メタル間のLNbは全鉄濃度の増加とともに上昇したがLMnおよびLpはほぼ一定値を示した.
2)各分配比は同一の全鉄濃度においてLNb>LMn≫Lpの順であつた.
3)本実験結果を1400℃,[%C]=3の場合に換算して各分配比を求めた.従来の研究結果と比べると,一定T.Fe濃度下ではLp以外はほぼ一致した.抄録全体を表示PDF形式でダウンロード (688K) -
長林 烈, 日野 光兀, 萬谷 志郎1988 年 74 巻 9 号 p. 1770-1777
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーEquilibrium phosphorus distribution between slag and liquid iron has been studied at the temperature range from 1 300°C to 1 680°C in order to know the effect of additives on the phosphorus equilibrium and the approximate validity of the regular solution model for the phosphate slag. The slag systems studied were of FetO-P2O5-MxOy ( MxOy = CaO, MgO, SiO2) ternary and of FetO-P2O5-CaO-MxOy (MxOy = MgO, SiO2) quaternary.
In the wake of our previous two papers concerning the same experiments, the present paper deals with the results of phosphorus distribution between slag and metal. As the results, it was confirmed that the regular solution model was satisfied for all the experimental results including present work and the previous studies by other investigators, except for composition extreamly rich in iron oxide. The phosphorus content in metal and the activity of phosphorus pent-oxide in slag can be estimated within the accuracy of ± 10% by the model.抄録全体を表示PDF形式でダウンロード (1417K) -
国定 京治, 岩井 彦哉1988 年 74 巻 9 号 p. 1778-1784
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーExperiments of dephosphorization of the molten iron containing manganese (13-35 wt%), carbon (0-5 wt%), and phosphorus (0.1 wt%) by the Na2O-based fluxes (Na4SiO4, Na4SiO4-NaF) were carried out in a temperature range from 1 300°C to 1 550°C. The effects of carbon and manganese contents in the molten iron, NaF and MnO2 additions to the flux, and temperature on dephosphorization were investigated. Phosphorus distribution ratios obtained at the end of runs as affected by carbon content in the melt and Na2O and MnO contents in the slag were also investigated. In addition, the equilibrium concentration of phosphorus in molten iron was calculated from the thermodynamic data. The calculated phosphorus concentration was represented in terms of manganese and carbon contents in molten iron and compared with the observed one.抄録全体を表示PDF形式でダウンロード (1206K) -
井口 学, 谷 潤一, 植村 知正, 川端 弘俊, 竹内 博明1988 年 74 巻 9 号 p. 1785-1792
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーExperimental conditions of bubbling jets were chosen in the intermediate gas flow rate regime where the size and the shape of bubbles are mainly determined by nozzle size and gas flow rate. The velocity and the turbulence intensity of liquid in bubbling jets were measured by making use of LDV (Laser Doppler Velocimeter). The radial and axial distributions of them were related to the behaviour of rising bubbles. The empirical expressions for the velocity and turbulence intensity on the center-line were presented as functions of gas flow rate. Also water jets in the same vessel were measured to confirm the applicability of LDV system and to clarify the effect of side wall on the confined jets.抄録全体を表示PDF形式でダウンロード (2768K) -
小塚 敏之, 浅井 滋生, 鞭 巖1988 年 74 巻 9 号 p. 1793-1800
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーIn a horizontal electromagnetic casting ( HEMC ), molten metal which flows out of a nozzle is levitated by imposing direct electric current and direct magnetic flux. Thus, this process makes it possible not only to eliminate the surface defects of ingot caused by contacting with mold wall but also to carry out near net shape casting. The additional advantage of this process is the favorable applicability to the casting of heavy metals at an expense for investment smaller than that for the conventional vertical electromagnetic casting ( VEMC ) already used in the aluminum industry.
In this work, to clarify the fundamental process characteristics of HEMC, experiments for casting thin plates of Bi-Sn-Zn alloy are conducted, and the theoretical analysis on the process stability is developed. The HEMC process promises that the products with the desirable shape of the plate and good surface conditions can be obtained under the stable operating conditions determined by the theoretical analysis.抄録全体を表示PDF形式でダウンロード (4723K) -
永田 和宏, 後藤 和弘1988 年 74 巻 9 号 p. 1801-1808
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーThe number of oxygen sensors consumed by Japanese steelmaking industries in 1985 was surveyed. 459 110 oxygen sensors were consumed and 24.7% of them were used in converters, 8.3% in ladles, 51.9% in RH-DH, 11.3% in secondary refinings and others and 3.8% in tandishes of continuous casting. The oxygen sensors were used mainly for determining the amount of deoxidizers of molten steel and controling the content of aluminium dissolved in molten steel. New aims to use oxygen sensors were to estimate the content of carbon, phosphorus or manganese in molten steel in converter and precisely to control oxygen content in molten rimmed steel for continuous casting. By comparing the present results with the previous works in 1977, 1980 and 1982, the relation between the improvement of oxygen sensors for steelmaking and the steelmaking technic was discussed.抄録全体を表示PDF形式でダウンロード (1521K) -
井上 正敏, 大森 和郎, 折田 朝之, 岡村 勇, 磯山 茂, 樽井 正昭1988 年 74 巻 9 号 p. 1809-1816
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーThe presented rolling techonology aims at supplying heavy plates without edge trmming by incorporating an attached edger close to the finishing mill. Technical subjects for realizing this object include; rolling force and torque in V rolling, prevention of buckling in heavy width reduction, elimination of edge overlap by chamfer rolling, and overall rolling strategy. These subjects are first examined in experiments by lead model, and an production mill is constructed. Important features and some experiences in the production mill are summarized below; suggesting the promising future of the present technology.
1) The V roll has a caliber part as well as a flat part in order that the edge can be shaped in square by selective use of either part according to the rolling pass by roll shifting.
2) The overall rolling strategy including V rolling is supported by accurate AWC system, and is effective for attaining high width accuracy over the whole length of rollling material.
3) Width loss can be drastically reduced by chamfer rolling and finish-edging combined.抄録全体を表示PDF形式でダウンロード (2553K) -
松井 健一, 山本 章生, 橘 秀文1988 年 74 巻 9 号 p. 1817-1823
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーSumitomo Metal Ind. Ltd. has succeeded in developing a new type of shape meter to measure the flatness of hot strips at the exit of a hot finishing mill.
The meter consists of an Ar-ion laser, three optical scanning mirrors, a high speed TV camera, and an image processor. It is based on the light section method. Three laser beams scan the width of the strips. The TV camera takes the projected laser beam image on the strip. The image processor calculates the height and the elongation index (flatness) of the strip. Because the elongation indexes are calculated using three projected beams, the measuring error caused by the strip's flutter is canceled.
The accuracy of height measurement was confirmed to be ± 1 mm. The flatness measured by the shape meter agreed with the results of visual observation by mill operators. It can be used even in hot, steamy and dusty atmospheres. These meters have been in practical use at Kashima Steel Works and Wakayama Steel Works since January 1986. They have been contributing to the improvement in the quality of hot strip coils.抄録全体を表示PDF形式でダウンロード (4926K) -
赤間 誠, 松山 晋作1988 年 74 巻 9 号 p. 1824-1831
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーRepeated impact blows given by a passing train to the joints cause plastic flow on a rail head, sometimes resulting in its fatigue fracture. To cope with this phenomenon, the End-Hardened rail (EH rail) has come to be widely used.
Though the effectiveness of this kind of rail has been confirmed by field test, the characteristics of plastic flow by cyclic impact blow have not been clarified yet. In this study, cyclic impact blow test and low cycle fatigue test have been performed using 0.75%C steels with different hardness and structure.
The results are summarized as follows :
1) The deformation caused by cyclic impact blow in the pearlite structure is larger than in the tempered martensite one. In the case of tempered martensite structure, there occurs a cyclic softening at an early stage of the deformation in cyclic impact blow test. On the contrary, there occurs only hardening in the case of pearlite structure.
2) Dislocation structures in cyclic impact blow test change remarkably with the distance from the impact surface. Further, fatigue behavior in cyclic impact blow test can be estimated almost from the result of low cycle test.抄録全体を表示PDF形式でダウンロード (7186K) -
小溝 裕一, 村山 順一郎, 大谷 泰夫1988 年 74 巻 9 号 p. 1832-1838
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーA study was done in order to get the preferable interface strength in a cladding of titanium to carbon steel from the view point of diffusion of metallic elements and the formation of intermetallic compounds. The formation of titanium carbide lowered the interfacial strength in a direct cladding of titanium to steel.
In the case of cladding of titanium to steel with an insert metal of nickel, the intermetallic compounds of Ni3Ti, NiTi and NiTi2 were observed at the bonding interface of Ni/Ti. The voids which were thought to be induced by Kirkendal effect were also observed at Ni/Ni3Ti layer. Holding a long time at elevated temperature lowered the interfacial strength due to the formation of wide intermetallic compounds which grew according to the parabolic law.
In the case of cladding of titanium to steel with the insert metal of pure iron, the intermetallic compounds of Fe2Ti and FeTi were observed at the bonding interface of Fe/Ti. However, the growth rate of these intermetallic compounds was quite small compared with that in the case of Ni/Ti system. From the analysis of Ti/Fe/carbon steel joint heated up to an elevated temperature after rolling, the TiC as well as Fe-Ti intermetallic compounds were formed along the bonding interface because the carbon atoms diffuse from the carbon steel through the insert metal of Fe. Therefore, the carbon steel/Ni/Fe/titanium system was useful to get the preferable interface strength in the cladding of titanium to carbon steel.抄録全体を表示PDF形式でダウンロード (6051K) -
飴山 惠, 皆川 昌紀, 牧 正志, 田村 今男1988 年 74 巻 9 号 p. 1839-1845
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーThis paper describes morphologic features of proeutectoid ferrite (α) formed at austenite (γ) grain boundaries in three kinds of steel ; a HSLA steel with 0.04%Nb and 0.04%V, a commercial 0.2%C steel and an Fe-0.1%C alloy. Shape of the proeutectoid α at γ grain boundaries strongly depended on the austenitizing temperature. At the higher temperature, the proeutectoid (α) grains precipitated in the shape of film along planar γ grain boundaries, and a coalescence of several α grains with the same orientation made the film-shaped α in which many subgrain boundaries were observed. At the lower austenitizing temperature, on the other hand, they precipitated in the shape pf globe (allotriomorph) form along curved γ grain boundaries. Each a grain had a different orientation and led to allotriomorph. This trend was commonly observed in all the steels investigated.抄録全体を表示PDF形式でダウンロード (13042K) -
岩渕 義孝, 畔越 喜代治, 波多野 隆司1988 年 74 巻 9 号 p. 1846-1853
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーCarbide-induced brittleness causes the decrease in notch toughness which often occurs in 13Cr-4Ni steel castings when heated or cooled slowly at about 650°C. The influence of P content on this embrittlement was studied, since the low P content could be obtained in high chromium steels by the advanced refining process. Impact notch toughness was deteriorated when the 13Cr-4Ni steel castings were isothermally held at 650°C in austenite range, and this behavior was remarkable for high P materials. Toughness deterioration was related to intergranular fracture and carbide precipitation at prior austenite grain boundary, and also this tendency was increased with higher P contents. P element was presumed to facilitate the nucleation sites of intergranular carbide, and to promote the carbide precipitation reaction and then grain boundary brittleness.抄録全体を表示PDF形式でダウンロード (8006K) -
角田 方衛, 丸山 典夫1988 年 74 巻 9 号 p. 1854-1861
発行日: 1988/09/01
公開日: 2010/01/15
ジャーナル フリーThe factors which control fatigue crack growth behaviors in Ti-6Al-4V in the ΔK range less than 30 kgf/mm3/2 in sea weter were discussed with respect to those in the air. The results obtained are as follows ;
1) Fatigue crack growth rate, da/dN, is higher in sea water than that in the air at the stress ratios of 0.1 to 0.7. The trend is much remarkable at lower levels of stress ratio and ΔK.
2) The value of da/ dN in sea water is not influenced by the crack tip closure at the stress ratios larger than 0.5, while da/ dN in the air is influenced by the crack tip closure at stress ratios larger than 0.9.
The different crack growth behavior in sea water from that in the air is explained in terms of roughness of fracture surfase. Rougher fracture in sea water is resolved into a smoother one.
3) The da/ dN value plotted against ΔKeff in sea water is higher than that in the air. However, maximum ratio of da/ dN in both the environments is less than two.
4) Crack in sea water does not grow at ΔK levels less than the effective stress intensity threshold, ΔKth, eff, in the air.
5) Fracture surface consists of cleavage-like patterns in sea water and in the air, and it shows of α grain boundary cracking and transgranular cracking of β phase in both the environments at ΔK levels close to ΔKth.抄録全体を表示PDF形式でダウンロード (8506K) -
川上 正博, 北島 要春, 伊藤 公允, 榎本 正人1988 年 74 巻 9 号 p. 1862-1867
発行日: 1988/09/01
公開日: 2009/05/29
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肥田 行博, 大中 逸雄1988 年 74 巻 9 号 p. 1887-1888
発行日: 1988/09/01
公開日: 2009/05/29
ジャーナル フリーPDF形式でダウンロード (422K)
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