著者

杉沢 精一 浜松 茂喜 菊池 浩平 国重 和俊

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.68, no.9, pp.1256-1262, 1982-07-01

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Manufacturing factors and properties of hot rolled 60 kgf/mm^2 class dual phase (DP) steels by two producing methods, which were suitable for mass production, were discussed. (1) As rolled extra low temperature coiling method developed using three step cooling pattern, called as "Inline controlled quenching (ICQ) method" was suitable for massproduction of DP steel with low alloying component (1.5%Mn and low Si content less than 0.15%). It was important for stabilization of mechanical properties to control the temperature and period of the second air cooling stage between water cooling stages according to variation of chemical composition. (2) The continuous annealing (CA) method as the heat-treated type process was fit for the case that low yield ratio was especially required. (3) As the result of investigation about formability, bake hardenability and weldability, it was proved that the hole expansion ratio of DP steel was remarkably improved with inclusion shape control by calcium-addition, bake hardenability of ICQ-DP steel was larger than the CA steel due to higher solute nitrogen content, and that weldability was excellent except flash-butt welding for auto wheel rim. (4) DP steels were successfully appliable to auto wheel disc and most parts made of hot rolled mild steels and their applications have been useful for weight reduction.

著者

片山 裕之 北村 寿宏 高橋 一郎

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.91, no.1, pp.122-126, 2005-01-01

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Iron making by Tatara at Oku-Izumo developed from reopening in 1638 after prohibition of operation to becoming the center of iron production in Japan in the end of Edo era The history of its management was studied from the stand point of countermeasure to environmental and economic problems, and quality of the product, In order to get the hints for the future iron and steel making (1) Managers of tatara at Oku-Izumo held concurrently the manager of agriculture, forest and stock farming As the results of the all-round management, social system of circulation was established under cooperation with the administration (2)The change of Tatara operation from 4 to 3 d in the first half of 19th century was trial and error for economical production system, and fixing of 3 d operation was interpreted as the flexible production system (3) Superiority of Kera produced by Tatara process as the material for production of sword by forging was originated in un-uniformity This suggests that conception surpassing the optimum of partial process is valid for cost down of quality assurance and the creation added value of the product in modern iron and steel making

著者

片山 裕之 北村 寿宏 高橋 一郎

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.91, no.1, pp.122-126, 2005-01-01

参考文献数

16

被引用文献数

1

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Iron making by Tatara at Oku-Izumo developed from reopening in 1638 after prohibition of operation to becoming the center of iron production in Japan in the end of Edo era. The history of its management was studied from the stand point of countermeasure to environmental and economic problems, and quality of the product, in order to get the hints for the future iron and steel making.<BR>(1) Managers of tatara at Oku-Izumo held concurrently the manager of agriculture, forest and stock farming. As the results of the all-round management, social system of circulation was established, under cooperation with the administration.<BR>(2) The change of Tatara operation from 4 to 3 d in the first half of 19th century was trial and error for economical production system, and fixing of 3 d operation was interpreted as the flexible production system.<BR>(3) Superiority of Kera produced by Tatara process as the material for production of sword by forging was originated in un-uniformity. This suggests that conception surpassing the optimum of partial process is valid for cost down of quality assurance and the creation added value of the product in modern iron and steel making.

著者

鈴木 卓夫 永田 和宏

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.85, no.12, pp.905-910, 1999-12

被引用文献数

2

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In 1977, Japan Institute of Art Japanese Sword was reconstructed Tatara furnace for direct steelmaking from iron sand and charcoal, so called Kera-oshi method. This Tatara furnace called Nittouho Tatara was constructed on the base of Yasukuni Tatara furnace which had been operated until the end of the World War II in Yokota city in Shimane prefecture. For this reconstruction of the furnace and the direct steelmaking operation, the great effort of Mr. Yoshizo Abe as a leader Murage had been paid and his techniques should be made clear. Until the age of Yasukuni Tatara, Kera-oshi method was consisted of 4 stages ; Komori, Komoritsugi, Nobori and Kudari. In the 2nd stage of Komoritsugi, Komori iron sand had been used to charge because of easy reduction and production of pig iron. In 1977, Mr. Abe had met difficulty to collect Komori iron sand. Then, he developed the new technique of Tatara operation using only Masa iron sand for the last two stages in spite of Komori iron sand. He controlled the wet of iron sand and made the residual time of iron sand longer in furnace. The reduced iron particles have enough time to absorb carbon for producing pig iron.

著者

豊岡 高明 横山 栄一 江島 彬夫 富永 博友 河津 信義 細川 泰利

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.67, no.4, 1981-03-05

著者

喜多 善史 大口 滋 森田 善一郎

出版者

社団法人日本鉄鋼協会

雑誌

鐵と鋼 : 日本鐡鋼協會々誌 (ISSN:00211575)

巻号頁・発行日

vol.64, no.6, pp.711-719, 1978-05-01

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For the precise measurement of the electrical resistivity of molten metals at high temperature, the four-probe method has been improved by use of a newly designed cell in which the four electrodes made of the same material as the specimen were installed. The results of the preliminary experiment on molten tin and copper were in excellent agreement with those of the previous studies by other investigators, and it was proved that "the improved four-probe method" was quite suitable for the measurement of the electrical resistivity of molten metals at high temperature. The electrical resistivity of molten iron, cobalt and nickel, obtained in the temperature range from melting point to about 1660℃ (iron) and 1620℃ (cobalt and nickel), showed a linear dependency on temperature as represented by the following equations. Fe : ρ(μΩ・cm)=0.0154t(℃)+112.3 Co : ρ(μΩ・cm)=0.0192t(℃)+91.8 Ni : ρ(μΩ・cm)=0.0116t(℃)+70.2 Probable error in the measurement was estimated to be about ±0.2%. The ratio of the resistivity of the liquid metal (ρ_l) to the solid metal (ρ_s) at melting point was evaluated to be 1.06, 1.14 and 1.40 for Fe, Co and Ni respectively.