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63 巻, 1 号
選択された号の論文の22件中1～22を表示しています
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小林 佐三郎1977 年 63 巻 1 号 p. 1-2
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーPDF形式でダウンロード (1495K) -
昭和51年の歩み伊木 常世1977 年 63 巻 1 号 p. 3-27
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーPDF形式でダウンロード (7827K) -
中村 正和, 杉山 喬, 鵜野 建夫, 原 行明, 近藤 真一1977 年 63 巻 1 号 p. 28-36
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーThe tuyere combustion zone has been studied on an experimental furnace by measuring dimensions and temperature in the raceway.
The effects of variables such as the blast velocity, tuyere diameter, and coke size are studied. Expressions are derived for estimating the length, width, and height of the raceway in terms of the velocity and density of the blast air, tuyere diameter, and coke properties such as the size, density, and shape factor.
Discussion is carried out according to the idea that the compressive force of blast to the coke bed is balanced with tendency of collapse of the raceway wall, and that coke in the raceway is fluidized by raceway gas.
Measurements of operating blast furnaces by rod test are shown to be generally in good agreement with those on the experimental furnace.抄録全体を表示PDF形式でダウンロード (1767K) -
稲田 爽一, 渡辺 哲弥1977 年 63 巻 1 号 p. 37-44
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーThe gas bubble swarms has been applied as and effective means to the gas-melt reaction in many steel making processes such as the oxygen blow in electric furnace, or bottom blown oxygen converter operations. There have been, however, few fundamental studies available for understanding of the process because of the difficulty of estimation of gas bubble characteristic which is thought to be a basic factor for the reaction efficiency. Standing on this viewpoint, this study has been undertaken to clarify the influences of operation or vessel design at on this viewpoint, this study has been undertaken to clarify the influences of operation or vessel design conditions on the efficiency of gas-liquid reaction, mainly aiming at the bottom blown converter process, by applying the experimental technique of chemical engineering.
The model test of NaOH solution-CO2 gas bubbles was conduted in the range of (Re) n=103-104 and the effects of the gas blow rate, nozzle conditions, depth of liquid, directions of blowing etc. on the volumetric mass transfer coefficient AKL were investigated by the continuous measurement of PH in solution. The results are summarized as follows:
(1) The diameter of nozzle, d0 had little effect of AKL, and AKL was proportional to the gas blow rate Vm as expressed as AKL=β. Vm 0.65 where β is a constant of proportionality.
(2) When the number of nozzle was increased, AKL per one nozzle was decreased. This phenomenon may be explained by the cell model that the bulk is divided into the cells ruled by the number of nozzle.
(3) The effects of the liquid depth and end effect on AKL were qualitatively illustrated for each bottom, side, top blowings.
Finally, the application of experimental technique of chemical engineering to the metallurgical research and the application of the present model teet to practical problems were discussed.抄録全体を表示PDF形式でダウンロード (1694K) -
鈴木 是明, 宮本 剛汎1977 年 63 巻 1 号 p. 45-52
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーA direct observation of “A” segregation in 4 ton sand cast ingots, which had been dumped at 40 and 120min after pouring respectively, was made to discuss the formation mechanism of “A” segregation with the result of temperature measurement into consideration.
The results obtained are as follows:
1) The “A” segregation was found to be formed at the solidification front where the fraction solid was between 0.3 and 0.35, or in the region of lower fraction solid.
2) The interdendritic enriched liquid metal could flow into the strings, even when the fraction solid of the neighborhood was 0.7.
3) The transition of “A” segregation zone to “V” segregation zone in an ingot is caused by a suction effect.
4) The growing direction of primary dendrites in the strings was reverse to the solidification wave in an ingot; i, e. solidification in the strings proceeds outwards from the inside of an ingot.抄録全体を表示PDF形式でダウンロード (9314K) -
鈴木 是明, 宮木 剛汎1977 年 63 巻 1 号 p. 53-62
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーA simulation test of “A” segregation was made successfully by means of horizontal unidirectional solidification of 14kg ingot. “A” segregations reproduced by this method under several cooling conditions were investigated from the viewpoints of cooling and solidification rates.
The results obtaind are as follows
1) “A” segregation is formed at the solidification front where the fraction solid is about 0.35 and it's inclination is determined by the vecter sum of the proceeding velocity of the solidification front and the upward velocity of solute enriched liquid metal.
2) The critical condition for formation of “A” segregation of 0.7%C steel can be expressed by the following formula. where, R is solidification rate (mm/min) and ε is the cooling rate (°C/min)
3) The size of “A” segregation spots are determined by the staying time in solid-liquid zone.抄録全体を表示PDF形式でダウンロード (8896K) -
福沢 章, 中川 龍一, 吉松 史朗, 上田 卓弥1977 年 63 巻 1 号 p. 63-72
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーA mathematical model of the NRIM continuous steelmaking process has been developed on the basis of the assumption that the rate limiting step in the steelmaking reaction is mass transfer which is the function of flow rates of jetted oxygen and generated CO gas. Resistance constants in mass transfer equations and other system parameters used in the model are determined by the complex optimization method to get a good agreement with the actual data in steady state. Results applied for the start-up simulations for the NRIM process operations show that the model can represent the actual process with accuracy. This means that the parameter constants in steady state are available for the unsteady state simulation, so that the model can be used for an optimal designing of the continuous steelmaking process and for the development of the process control strategy. Moreover, the assumption that the gas flow rates have an important role for bath mixing can provide a valuable aid to understand the steelmaking reaction kinetics.抄録全体を表示PDF形式でダウンロード (2158K) -
小林 洋1977 年 63 巻 1 号 p. 73-79
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーThe coasening of austenite grains has been studied kinetically in low-carbon high-manganese steels containing Al, V, and Nb, respectively.
The austenite grain growth rate is remarkably decreased by a small addition of Nb. In contrast, the effect of V is very small.
The activation energy for the austenite grain growth in the steels containing Al, V, and Nb in solution has been determined to be 65.4, 65.0, and 3.7kcal/mol, respectively; the energy is remarkably increased by a small addition of Nb. This can be attributed to the fact that the activation energy for the diffusion of Nb in austenite and the binding energy between Nb and austenite grain boundary are both great.
The rate constant of the grain growth below 1250°C in the steels containing more than 0.10wt% Nb is smaller than that predicted by “Impurity drag model”. This is considered to be due to the presense of Nb (C, N) which is not dissolved. Such undissolved particles have a great effect of the austenite grain growth.抄録全体を表示PDF形式でダウンロード (3076K) -
辻 克己, 荒尾 潔1977 年 63 巻 1 号 p. 80-89
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーA discontinuous austenite grain coarsing phenomenon of double hardened high speed tool steel and the procedure to control the grain gtowth on the second hardening have been studied under various heat treatment conditions. It is found that the discontinuous austenite grain growth is caused by disolusion of metastable carbides which have precipitated as a fine dispersion during the early stage of second hardening and that the grain coarsing on the double hardening can be controlled by intermediate heat treatment, i. e., rapid colling from α zone just under Ac1 or γ zone just above Ac3.
A heat treatment that the high speed tool steel of 6-5-4-2 type is quenched from γ zone just above Ac3 followed by heating at α zone just under Ac1, is effective for preventing the discontinuous austenite grain growth and for refining austenite grain on subsequent austenitization.抄録全体を表示PDF形式でダウンロード (7627K) -
鎌倉 正孝, 石川 英次郎1977 年 63 巻 1 号 p. 90-97
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーThe C-O carbon vs. oxygen relations of extremely low carbon austenitic stainless steel and Ni-base alloy, in comparison with iron, were studied for the vacuum refined melts together with some thermodynamic considerations.
Sampling was made during the quiescent period of melts in a 200kg vacuum induction furnace with the MgO lining, and then the chemical compositions were determined.
During quiescent period after violent boiling the C-O relations in the stainless steels with C%≈0.01 were shown to be in equilibrium and the following relations were obtained.
Melt Temp. (°C)
Fe 1600
Austenitic
Stainless
steel
Ni base 1550
high alloy
Calculated values of PCO for the iron melts were about 10times higher than those for stainless steels. It is considered that the effect of refractory on the oxygen potential of molten steel depends on accompanying elements.
For the Ni base high alloys it was found that the C-O relation was similat to those for steel and the efficiency of deoxidizer added at tapping was greater than those for steels.抄録全体を表示PDF形式でダウンロード (1373K) -
岡林 邦夫, 冨田 恵之, 山口 俊雄1977 年 63 巻 1 号 p. 98-107
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーA study has been made of effects of residual carbides on the notch slow bending fracture in high carbon and low chromium steels.
Results obtained are as follows:
Absorbed energy obtained of the 2mmV notch test specimens decreases with an increase in mean particle size of residual carbides in specimens containing 13 per cent of residual carbides in volume, but increases with an increase in mean particle size of residual carbides in specimens containing 8 per cent of residual carbides in volume, regardless of the test temperature. It is assumed that the former depends primarily on the resistance of fracture of residual carbides or the resistance of separation of them from matrix owing to fracturing at the interface of them, while the latter depends primarily on stress concentration at the interface of residual carbides under 2mmV notch.
On the other hand, absorbed energy obtained of the 2mmV notch test specimens with pre-crack increases with an incresae in mean particle size of residual carbides, regardless of amounts of residual carbides and the test temperature, this being distinct from the results obtained of 2mmV notch test specimens. It is assumed that these results depend primarily on stress concentration at the interface of residual carbides.抄録全体を表示PDF形式でダウンロード (12973K) -
木下 勝雄, 鶴岡 一夫1977 年 63 巻 1 号 p. 108-117
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーThe solubility of selenium in Fe-3.25% silicon alloy was determined by equilibrating the alloy with a gaseous mixture of H2 and H2Se. The composition of the gas mixture, was controlled by adjusting thetemperature of the following reaction:
FeSe (s or l) +H2 (g) _??_Fe (s) +H2Se (g)
The results obtained are as follows:
1) The solidus and the liquidus temperature of FeSe were found to be 1270° and 1318°K, respectively. Equilibrium constant, K=PH2Se/PH2, was determined to be
logK=-3760/T+0.15 (T<1270°K)
logK=-2200/T+0.53 (1318°K<T)
2) In the absence of manganese, the solubility of selenium was found to be 0.016% (in wt%) at 1200°C, 0.022% at 1250°C and 0.061% at 1300°C. In the presence of 0.05% manganese the solubility ofselenium was found to be 0.014% at 1200°C, 0.017% at 1250°C and 0.041% at 1300°C. In the presenceof 0.10% manganese the selenium solubility was 0.011% at 1200°C, 0.015% at 1250°C and 0.030% at1300°C.
3) The solubility product of manganese and selenium was found to be strongly dependent on manganesecontent in the range of manganese levels measured.抄録全体を表示PDF形式でダウンロード (6159K) -
渡辺 力蔵, 千葉 芳孝1977 年 63 巻 1 号 p. 118-124
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーFor the purpose of developing cobalt-free tube materlals for the heat-exchanger of nuclear steel-making process, an alloy design has been conducted with respect to the Ni-Cr-W system.
Theoretically promising composition ranges in the Ni-Cr-W system are determined by the conditions that average electron vacancy number Nv is smaller than Barrows' critical electron vacancy number Nc and that lattice parameter a is greater than 3.580 Å. some compositions in the above mentioned range have been examined experimentally and 23% Cr-18%W has been determined as the best composition from the creep rupture strength point of view.
Effects of carbon and magnesium on the creep rupture strength of 23%Cr-18%W-Ti-Zr-Bal. Ni alloy have been studied. The long-term creep rupture strength decreases with the increase of carbon content in the range from 0.03% to 0.14%. Up to 90 ppm magnesium does not significantly affect the creep rupture strength of the alloy at 1000°C, but about 160 ppm magnesium significantly reduces the creep rupture strength at that temperature.
In conclusion, 23%Cr-18%W- (0.3%Ti) - (0.05%Zr) -0.03%C-Bal. Ni alloy has a high possibility of satisfying the creep rupture strength target, that is more than 1kg/mmmm2 at 1000°C and 105 hours.抄録全体を表示PDF形式でダウンロード (3093K) -
渡辺 力蔵1977 年 63 巻 1 号 p. 125-129
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーIn order to examine the possibility of developing an intermediate heat-exchanger material for the nuclear steel making which is cheaper than 23% Cr-18% W-Ni alloy developed in the previous study, an alloy design has been conducted with respect to austenitic Ni-Cr-Mo three component system.
Theoretically promising composition range is determined by the following conditions; (1) average electron vacancy number NV is smaller than Barrows' critical electron vacancy number, (2) lattice parameter is greater than 3.580 Å, (3) NV is greater than 1.90.
As a result of experimetal examination, it has been shown that 26% Cr-9.5% Mo is the best in the theoreti-cally promising composition range from 1000°C creep rupture strength point of view, and that an addition of about 0.07% carbon increases creep rupture strength at 1000°C. The target creep rupture strength, that is, higher than 1kg/mmmm2 at 1000°C-105 hours, however, is not satisfied.
26% Cr-9.5% Mo-Ti-Zr-C-Bal. Ni alloy which has been developed in the present study has almost the same creep rupture strength at 1000°C as that of Inconel 617, and seems to be applicable to various high temperature parts in nuclear power plants, because it contains no cobalt.抄録全体を表示PDF形式でダウンロード (2701K) -
加藤 忠一, 乙黒 靖男, 門 智1977 年 63 巻 1 号 p. 130-138
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーThe grooving corrosion resistance of the ERW Cu-Sb, Cu-Ti, and Cu-Ti-Cr low alloy steel pipes were investigated. Corrosion tests carried out in artificial seawater showed that these pipes had grooving corrosion resistances four to seven times higher than that of a plain carbon steel pipe. Difference in the degree of polarization between the weld and the base metal, as determined by polarization curves in 3% NaCl solution, was large in the carbon steel pipe, the weld being less polarized and small in low alloy steel pipes. A microscopic observation of the non-metallic inclusions revealed that there was a smaller quantity of MnS inclusions, inititation sites of the grooving corrosion, in the welds of these low alloy steel pipes than in the welds of carbon steel pipe. It was considered that the good grooving corrosion resistances of the low alloy steel pipes were due to the decrease of MnS inclusions in the welds, the elimination of S2- ion by the addition of copper, and the increase of the corrosion resistance of the base metal by the addition of chromium.抄録全体を表示PDF形式でダウンロード (9969K) -
赤城 正, 横田 貞介, 五弓 勇雄1977 年 63 巻 1 号 p. 139-146
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーVarious properties of highcarbon PC wire treated by cold-straightening and bluing (“CS+B”) and those by warm-straightening (“WS”) were compared and the following results obtained.
It was found that the greater the bending deviation during straightening, the straighter was the processed wire and the more stable was the torsion value. There was an increase in the diameter of the wire in the “CS” process and in the “WS” process at intermediate temperatures, but it was found that at higher temperatures the diameter reached a maximum and then gradually decreased, becoming less than the original diameter above 400°C.
The maximum tensile stength and sectional-hardness were obtained for “CS+B” wire when treated at 200°C and 250°C respectively, while for “WS” wire the maximum values were obtained at 300°C. The “WS” wire had a lower stress-relaxation value than “CS+B” wire, this being paricularity evident at high autoclave temperatrue. One reason may be that the “WS” wire has a higher elastic limit than “CS+B” wire.
Minimum relaxation values for both “CS+B” wire and “WS” wire were obtained at a temperature approximately 50°C above that at which σ0.2 and σ0.02 showed a maximum and this corresponded with the results of creep tests performed at intermediate temperatures.
It is considered that in the “WS” process the dislocations increase and there are repeated lockings of these dislocations by solute atoms and that the composite effect of aging and process hardening results in a fixed structure of dislocations.抄録全体を表示PDF形式でダウンロード (1648K) -
北川 孟, 片山 道雄, 森本 一三, 丸山 英雄, 鶴岡 一夫1977 年 63 巻 1 号 p. 147-153
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーThis paper describes an automated system for X-ray diffractometry. This system has been developed with the main intentions of extending operation times, preparing labor-saving devices, and acquiring experimental data with better precision.
An IBM-1800 computer executes both the offline data processing and online device control for five kinds of X-ray spectrometers in the system.
Its implementation allows a substantial reduction in manpower with a considerable technical improvement over the previous methods, as descrived in the following.
(1) Only two persons are required to operate this system instead of five. (2) This system is continuously operated about one hundred hours in a week. Operation times are more than trebled as before. (3) Digital-to-analogue, and analogue-to-digital converters are not required since digital outputs from scalers are transmitted to the computer. Some appropriate software are applied for data processing, then signal to noise ratio of diffracted intensity is remarkably increased.
Using the newly developed x-ray diffractometers for determining pole figure and the computer control, pole density functions with better precision can be derived, for diffracted intensities are acquired by the inquiry and answer system.抄録全体を表示PDF形式でダウンロード (3561K) -
特に経済的側面よりみた技術的諸課題河野 力1977 年 63 巻 1 号 p. 154-173
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーPDF形式でダウンロード (4275K) -
森山 昭1977 年 63 巻 1 号 p. 174-175
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーPDF形式でダウンロード (220K) -
田畑 新太郎, 野崎 輝彦1977 年 63 巻 1 号 p. 176-182
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリー「合理化と組織的近代化を通じての鉄鋼業の生産性の向上」をメインテーマとする東南アジア鉄鋼協会秋季シンポジウムが9月20日より5日間台湾の高雄市の円山大飯店 (グランドホテル) において開催された.
このホテルは国営で建物は朱色の宮殿建築で造られており, ホテルの裏手には台湾で最も美しい湖の一つとされている澄清湖が一望に眺められ, この美しい静寂な環境の地に人情味豊かな暖かい歓迎準備は今次シンポジウムへの台湾側の意気込みを示すものであつた.
本シンポジウムの参加者は外国より100名, 国内を合わせて150名余の多数を得て盛大に行なわれた.
日本よりの参加者は19名で本大会の事務局側としては, 日本代表理事田畑新太郎 (日本鉄鋼協会専務), 安原武彦 (新日本製鉄エンジニアリング事業本部技術協力事業部技術部長), 戸田弘元 (日本鉄鋼連盟外国調査課長), 高子泰彦 (日本鉄鋼連盤外国調査課), 菊池英明 (日本鉄鋼協会技術部-住友より派遣中) 各氏が出席し, シンポジウム講師として加藤直 (住友金属工業小倉技術管理部次長) が参加し, 「一貫製鉄所におけるバー, ワイヤー, ロッドの品質管理」につき, スライドを使つての有意義な報告をおこない好評を博した.
本シンポジウムに発表された論文は合計10件で5つのセッシヨンに分けて活発な論議があつた. 特に注目に価するものとしては高雄で建設中であるChina Steel Corporationの一貫製鉄所建設に関する論文, 更に直接還元鉄に関するMidrex法の論文で参加者が特に興味を持つたものといえよう.
また, シンポジウム開催中には7つのスタディ・ツアーも計画されたが, 特に印象に残るものとして現在, 台湾で進められている10代建設の一つである, 高雄一貫製鉄所と高雄造船所に直接肌に触れる機会を得たことである.
軽工業国から重工業国への変貌をめざす台湾の成果がここにはつきりと認められる.抄録全体を表示PDF形式でダウンロード (3310K) -
天辰 正義, 郡司 好喜, 雀部 実, 高橋 恒雄, 小池 一幸, 松井 建造, 菊池 実, 上正原 和典, 矢崎 勝仁, 石川 準, 榎本 ...1977 年 63 巻 1 号 p. 183-188
発行日: 1977/01/01
公開日: 2010/02/22
ジャーナル フリーPDF形式でダウンロード (1713K) -
1977 年 63 巻 1 号 p. N11
発行日: 1977年
公開日: 2010/02/22
ジャーナル フリー「鉄と鋼」第62年 (1976) 第13号 ,p.1668
川和高穂, 細田義郎, 坂田直起, 伊藤雅治, 三好俊吉
上記掲載論文のテーマが次の通り誤りがありましたので, 訂正いたします. （誤）鋼塊内ザク分布と鋼板の方向絞りにおよぼす鋳型形状の影響 （正）鋼塊内ザク分布と鋼板のZ方向絞りにおよぼす鋳型形状の影響抄録全体を表示PDF形式でダウンロード (241K)
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