著者

浦辺 浪夫

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.67, no.7, pp.908-916, 1981-05-01 (Released:2009-06-19)

参考文献数

26

著者

郡司 好喜

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.80, no.6, pp.N266-N280, 1994-06-01 (Released:2009-06-19)

参考文献数

53

被引用文献数

1 2

著者

Masahiro KAWAKAMI Takahiro KARATO Toshihide TAKENAKA Seiji YOKOYAMA

出版者

The Iron and Steel Institute of Japan

雑誌

ISIJ International (ISSN:09151559)

巻号頁・発行日

vol.45, no.7, pp.1027-1034, 2005 (Released:2006-01-27)

参考文献数

15

被引用文献数

58 82

---

In order to discuss the reactivity of carbonaceous materials with CO2, the Raman spectroscopy analysis was carried out. Nine kinds of materials were examined. The Raman spectra of ordered materials could be assigned to the graphite structure and its defect, but those of disordered materials could not. New parameters were derived to evaluate the structure of the latter. Using the parameters, the structure change was followed during high temperature heat treatment. The disordered material consists of random structure, graphite structure and its defects. The random structure changes to the graphite structure with many defects and the defects decrease with the heat treatment temperature. The reaction rate constant is evaluated. It increases when the structure changes from the random structure to the graphite structure with many defects. After the change, it decreases with decreasing the defects in graphite structure. Thus, the most reactive material should consist of the graphite structure with many defects.

著者

Masahiro Yakeya Akito Kasai Rikizo Tadai Kentaro Nozawa

出版者

The Iron and Steel Institute of Japan

雑誌

ISIJ International (ISSN:09151559)

巻号頁・発行日

vol.60, no.7, pp.1438-1444, 2020-07-15 (Released:2020-07-16)

参考文献数

20

被引用文献数

7

---

A major operational problem in increasing pulverized coal rate and decreasing coke rate must be the increased pressure drop or the worsened gas permeability at the lower part of the blast furnace. In order to decrease the pressure drop at the blast furnace cohesive zone (CZ) under low coke rate operation, this study has focused on mixed coke charging in the ore layer. Results obtained by numerical analysis and experiments are as follows:(1) Numerical analysis using DEM (Discrete Element Method) clarified the change in the cohesive ore bed structure with mixed coke charging and the formation conditions of gas path in the bed. Also, DEM-CFD (DEM and Computational Fluid Dynamics) analysis enabled us to find a gas permeability improvement mechanism and an optimum coke mixing ratio for different CZ conditions before applying the technology.(2) Experiments in blast furnace hot model demonstrated the decreased pressure drop at the CZ by mixed coke charging in the ore layer. The experimental results abided by the numerical analysis results.

著者

長谷川 良佑

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.71, no.16, pp.1837-1845, 1985 (Released:2009-06-19)

参考文献数

34

著者

鈴木 卓夫

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.91, no.1, pp.97-102, 2005-01-01 (Released:2010-01-19)

参考文献数

15

被引用文献数

1 1

---

"Tatara" is a traditional box-type furnace in Japan and had produced iron from iron sand and charcol. In this Tatara there were two techniques which were called Zuku-Oshi and Kera-Oshi. Zuku means pig-iron and Kera means steel. The Tatara started in the latter half of six century and is continuing up to today. I am interested in when did the two techniques establish. So I tried to investigate the question with data of iron (pig-iron) image of Buddha making age and old document which is called "Kokon-Kajibiko". It is concluded that Zuku-Oshi has established regularly in Kamakura period (1192-1333). In Kera-Oshi case is the latter half of Muromachi period (1392-1573).

著者

十名 直喜

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.67, no.1, pp.188-191, 1981-01-01 (Released:2009-06-19)

被引用文献数

1

著者

長谷川 正義

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.41, no.4, pp.451-468, 1955-04-01 (Released:2010-01-19)

参考文献数

117

被引用文献数

1 1

著者

Jei-Pil Wang W. D. Cho

出版者

The Iron and Steel Institute of Japan

雑誌

ISIJ International (ISSN:09151559)

巻号頁・発行日

vol.49, no.12, pp.1926-1931, 2009-12-15 (Released:2009-12-20)

参考文献数

15

被引用文献数

12 26

---

The oxidation of pure copper in oxygen with and without water vapor was investigated as a function of temperature, oxygen pressure, and water vapor pressure using thermogravimetric analysis. The rate of the oxidation was increased with increasing temperature from 500 to 700°C and followed by the parabolic rate law regardless of the presence of water vapor. The activation energy for the oxidation was 90.67 kJ/mol in dry oxygen and 95.86 kJ/mol in oxygen with water vapor. The change of oxygen pressure without water vapor does not affect the oxidation rate at given temperatures. However, increasing water vapor pressure from 0.39 to 0.58 atm resulted in higher oxidation rate due to the increase of copper vacancies. CuO whiskers were observed and their growth seems to be enhanced by the presence of water vapor.

著者

小林 俊郎 新家 光雄 稲垣 育宏

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.75, no.3, pp.537-544, 1989-03-01 (Released:2010-01-18)

参考文献数

16

被引用文献数

1 1

---

It is highly expected that the ductility and toughness of titanium alloys bearing unstable β phase may be developed by the stress relaxation caused by strain-induced transformation. In this study, tensile test, Charpy impact test, static and dynamic fracture toughness tests were carried out at various temperatures on typical titanium alloys bearing unstable β phase. The strain-induced α″ martensitic transformation occurred in the (α+β) type Ti-6Al-2Sn-4Zr-6Mo alloy and the dynamic fracture toughness of this alloy increased considerably at 223 K. The strain-induced α' martensitic transformation occurred in the (α+β) type Ti-6Al-4V alloy, and the static and dynamic fracture toughness increased considerably at 123 and 223 K respectively and strength increased at low test temperatures in this alloy. The mechanical twin occurred in the β type Ti-15V-3Al-3Sn-3Cr alloy and the elongation of this alloy increased considerably at 123 K.

著者

Akira SATO Goro ARAGANE Satoshi OGATA Kei YAMADA Shiro YOSHIMATSU

出版者

The Iron and Steel Institute of Japan

雑誌

Transactions of the Iron and Steel Institute of Japan (ISSN:00211583)

巻号頁・発行日

vol.26, no.11, pp.949-954, 1986 (Released:2006-09-08)

参考文献数

14

被引用文献数

1

---

The oxidation rates of the elements in molten pig iron weighing 1kg contained in a graphite or an alumina crucible were measured by adding Fe2O3, CaO, Na2CO3, BaO, BaCO3, and Li2CO3 onto the bath. The dissolution rate of B2O3 in slag in distilled water or HCl solution was estimated by adding 10g of slag into water or a solution of 300cm3, stirring for 30min, and filtering.Boron in pig iron was effectively oxidized and trapped in the slag by the addition of Fe2O3 containing high basic fluxes under a higher oxidation atmosphere at low temperatures. Recovery of B2O3 can effectively be made by the dissolution of slag in distilled water at 100°C and more efficiently in HCl solution above 0.25N at 50°C. The dissolution of B2O3 in water was interfered by MnO, FeO, and SiO2.

著者

玉城 わかな 五十嵐 佑馬 藤巻 大輔 林 誠一 友田 陽 松野 泰也 長坂 徹也

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.92, no.5, pp.340-345, 2006-05-01 (Released:2009-06-19)

参考文献数

20

被引用文献数

6 6

---

1.91 milliont of steel scrap was exported from Japan to Korea in 2003, which accounted for more than 30% of the total steel scrap exported to other countries from Japan. Change in steel scrap demand in Korea in the future will make a great influence on the amount of Japan's steel scrap domestic consumption and export. In this work, quantitative data about the steel production, steel scrap demand and consumption during 1977-2003 in Korea were collected to analyze the amounts of inhouse, industrial and obsolete scrap generation, and total steel accumulation in Korea. Then, the steel scrap demand in Korea in the future was estimated. The total accumulation of steel in Korea was estimated as 380 million t in 2003 and 548 million t in 2010, respectively. The amount of obsolete scrap generation in Korea was 7.1 million t in 1996 and 9.0 million t in 2003, which was about 3.0% and 2.4% of the total steel accumulation in each year. Supposing that the amount of crude steel production, scrap consumption percentages in B.O.F and E.A.F will be stable, the obsolete scrap generation in Korea in 2010 were estimated as 13-17 million t. This significant increase in obsolete scrap generation in Korea could exceed the current amount of the scrap import. So, self-sufficiency of steel scrap could be achieved in around 2010 in Korea.

著者

俵 信次 福地 浩

出版者

The Iron and Steel Institute of Japan

雑誌

鐵と鋼 (ISSN:00211575)

巻号頁・発行日

vol.29, no.6, pp.518-533, 1943-06-25 (Released:2009-07-09)

参考文献数

4

---

Effect of the temperature of heat treatment on the wire-drawing operation and mechanical properties were examined, in view of obtaining fundamental data on the manufacture of the excellent piano wire. The result of the test on the effect of the copper content in the wire revealed a decrease of the twisting value in case of the copper content more than 0.15%.

著者

西田 功 田中 孝三 上原 輝久 矢場田 武 高野 成

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.71, no.2, pp.189-196, 1985-02-01 (Released:2009-06-19)

参考文献数

14

被引用文献数

1

---

No. 2 blast furnace in Kobe Works was blown in on February 4, 1981 and because of the economic conditions it was blown out on April 22, 1983. Since its working period was very short (about 2.2 years), it was banked with the expectation of blowing in after several years.The methods employed were :(1) to lower the stock line down to just above the level of the SiC brick lining (lower shaft) with the burden being replaced by coke, (2) to cool the furnace by N2 gas, (3) to preserve the furnace brick under N2 atmosphere.Two samples of SiC brick at lower shaft part were collected just after and at 8 months after blowing out, and then they were investigated. It was found that there was no impairment in the SiC brick during this 8-month period.Hot stoves were cooled by the natural cooling method with keeping airtight and their cooling periods were about 3 months. After cooling them, the observations inside them were done and it was confirmed that the damage of the brick was very little, so the reoperation of them would be of no trouble.

著者

三好 俊吉

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.81, no.11, pp.N534-N540, 1995-11-01 (Released:2009-06-19)

著者

Yanbin Yin Jiongming Zhang Shaowu Lei Qipeng Dong

出版者

The Iron and Steel Institute of Japan

雑誌

ISIJ International (ISSN:09151559)

巻号頁・発行日

pp.ISIJINT-2017-347, (Released:2017-10-13)

参考文献数

41

被引用文献数

2 40

---

Large inclusions captured by the solidifying shell deteriorate the surface quality of interstitial free steel. To investigate the capture of large inclusion in slab continuous casting, a three-dimensional model coupling flow field, solidification and inclusion motion has been developed. Additionally, to study the effect of in-mold electromagnetic stirring (M-EMS) on large inclusion capture, the electromagnetic field has been also coupled in the model. The results of electromagnetic field indicates its centrally symmetrical distribution on the cross-section, and the electromagnetic force swirls on the cross-section. The effects of M-EMS on flow pattern, solidification and inclusion capture have been discussed. The M-EMS significantly changes the flow pattern and solidifying shell thickness. The inhomogeneous distribution of large inclusions existing in the slab surface in the slab surface are different between the cases with and without M-EMS. Furthermore, the number of captured inclusions increases at 0–0.02 m beneath the wide surface and decreases at 0.02–0.04 m beneath the wide surface in response to the application of M-EMS. Large inclusions in steel were quantitatively analyzed by the galvanostatic electrolysis method. The experimental results are in agreement with the simulation results, suggesting that the model is valid.

著者

Corey Adam Myers Takao Nakagaki

出版者

The Iron and Steel Institute of Japan

雑誌

ISIJ International (ISSN:09151559)

巻号頁・発行日

vol.59, no.4, pp.687-696, 2019-04-15 (Released:2019-04-17)

参考文献数

105

被引用文献数

1 9

---

A prediction of the nucleation lag time of iron and steelmaking melts solely from elemental composition and temperature was produced via deep neural networks trained on data available in the literature. To the best of our knowledge, this constitutes the first published instance of prediction of nucleation lag time that does not require composition specific empirical data. Control of the nucleation process is critical for the production of ground granulated blast furnace slag, control of slag properties for heat recovery or utilization, and the optimization of slag for CO2 mineralization. The deep neural network achieved an average absolute scaled error (AASE) over a testing set of 947 points covering 7 orders of magnitude of 39.9%. Performance was further improved by bootstrapping with a prediction of liquidus temperature from a separate deep neural network (AASE = 33.4%). Bootstrapping using DNN-generated viscosity data did not increase prediction accuracy. The negligible calculation load of the trained deep neural networks allows for rapid design, analysis, and optimization of novel slag compositions and treatment methods. This ability was demonstrated by calculating the necessary continuous cooling rate to generate amorphous slag across all CaO–Al2O3–SiO2 and CaO–FeO–SiO2 compositions and the potential to use additives to alter said cooling rate.

著者

Hiroshi Nogami Jun-ichiro Yagi Shin-ya Kitamura Peter Richard Austin

出版者

The Iron and Steel Institute of Japan

雑誌

ISIJ International (ISSN:09151559)

巻号頁・発行日

vol.46, no.12, pp.1759-1766, 2006 (Released:2006-12-21)

参考文献数

25

被引用文献数

35 55

---

The iron and steelmaking industry has been receiving social pressure to reduce energy consumption and environmental load as recent increase in the social awareness on environmental and resource problems. The ironmaking system consumes more than a half of overall energy input to the steelwork and its improvement is expected as a countermeasure for such problems. Numerous attempts through improving the blast furnace operation have been made. This paper analyzes material and energy balances of ironmaking system that consists of hot stove, coke oven, CDQ, sintering and blast furnace. The operation statuses of the blast furnace with natural gas injection, metallic charging and top gas recycling that have been obtained by the kinetic-based numerical simulations are applied to this analysis. The results suggested that the metallic charging to blast furnace decreases both energy input and CO2 emission. The natural gas injection operation decreases the CO2 emission from the iron making system while the decrease in the energy input is small. The top gas recycling operation increases the CO2 emission due to the scrubbed CO2 from the recycled top gas.

著者

Hideyuki Matsuta

出版者

The Iron and Steel Institute of Japan

雑誌

ISIJ International (ISSN:09151559)

巻号頁・発行日

vol.55, no.1, pp.213-217, 2015-01-15 (Released:2015-02-06)

参考文献数

16

被引用文献数

5 8

---

When non-metallic atoms are excited in a low-pressure glow discharge plasma, absorption transitions can be observed in the 640–930 nm wavelength range where laser diodes are commercially available. These excited atoms can be sensitively probed by diode laser atomic absorption spectrometry (DL-AAS). Because an atomic absorption transition can also be detected by coherent forward scattering (CFS) spectrometry and CFS spectrometry with a diode laser has more attractive features than DL-AAS, diode laser coherent forward scattering spectrometry (DL-CFS) was employed to investigated the absorption transition of excited argon atom at 842.46 nm. Ar (I) 842.46 nm line was adopted due to the tunable wavelength range of available diode laser in this experiment. Excited argon atoms were produced in a glow discharge plasma. CFS signal intensity at 842.46 nm attained maximum at discharge current of 20 mA in 3 Torr (399 Pa) of argon and at magnetic field of 160 mT. Calibration curve of argon was prepared to mix a small amount of argon into 6 Torr (798 Pa) of helium. The signal intensity depended on the 4.4th power of the number density of argon. The 4.4th power dependence is too large to be explained by the theoretically predicted quadratic dependence. When a small amount of molecular nitrogen was mixed into argon plasma, strong suppression of CFS intensity was observed. Molecular gases such as air were found to be unsuitable for the plasma gas to excite the target atoms.

著者

大谷 隆一

出版者

The Iron and Steel Institute of Japan

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.66, no.14, pp.2106-2118, 1980-12-01 (Released:2009-06-19)

参考文献数

57

被引用文献数

3 4