著者

新家 光雄 赤堀 俊和 眞鍋 哲典 竹内 力 桂 成基 福井 壽男 鈴木 昭弘

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.90, no.3, pp.154-161, 2004-03-01

被引用文献数

1

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科研費報告書収録論文(課題番号:15200035/研究代表者:新家光雄/ナノ変調構造制御による生体用低弾性率型超弾塑性機能チタン材料の創製)

著者

杉山 喬

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.78, no.3, pp.N85-N86, 1992-03-01

著者

八木澤 猛

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.74, no.9, pp.1721-1726, 1988-09-01 (Released:2009-05-29)

参考文献数

20

著者

松田 昭一 岡村 義弘

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.60, no.2, pp.226-238, 1974-02-01

被引用文献数

1 1

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The process of formation of austenite has been studied in low-carbon low alloy steels. The specimens with acicular structures such as martensite, bainite or tempered martensite are heated at temperatures between A_<C1> and A_<C3>. The structual changes in these specimens during heating are observed in detail. The main results are as follows. 1) Austenitizing processes are divided into two stages. In the first stage globular austenites are formed accompanying the dissolution of cementite. Acicular austenites are as well formed at an early stage. 2) In the second stage a globular austenite is formed by the coalescence of the acicular austenite grains and those formed in the both stages grow to form extended austenite grains. 3) γ' transformation prevails in a boron containing steel. Based on these results, it is proposed that the reverse transformation are mainly controlled by the rate of recrystallization of austenite.

著者

白神 哲夫 石川 信行 石黒 守幸 山下 英治 溝口 茂

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.82, no.9, pp.777-782, 1996-09-01

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Effects of Ni and Si on delayed fracture properties of high strength steels with 1420MPa grade were investigated. 0.25% to 3.5% of Ni or 0.25% to 1.7% of Si was added respectively to 0.3%C-boron-containing steel. Delayed fracture test and measurement of diffusible hydrogen were carried out using bar steels for prestressed concrete with a diameter of 7.1 mm. As each addition of Ni or Si was increased, diffusible hydrogen decreased and delayed fracture properties improved in condition as heat treated. Diffusible hydrogen in Ni-containing steels increased after polishing the surface in comparison with as heat treated and no diffusible hydrogen in Si-containing steels was varied. In Ni-containing steels, Ni concentrating and Ni-sulphide forming at the surface retarded the absorption of hydrogen and delayed fracture properties were improved, while in Si-containing steels, variation of microstructure decreased trapping sites of hydrogen and consequently the absorption of hydrogen was prevented and delayed fracture properties improved.

著者

大中 都四郎

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.35, no.3, pp.69-73, 1949-03-25

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Detailed physico-chemical studies have recently been made on many important phenomena occurring in the steelmaking furnace. It is, however, desirable to consider all the operations used in the process as a whole, in order to see whether these operations are really necessary and sufficient in their mutual correlations. Standing upon the standpoint mentioned above, the author analysed physico-chemically these mutual correlations of the entire procedure in the open hearth process. As examples, data obtained from a practical acid open hearth process were used. As the result of it, it becomes clear that the open hearth process now successfully applied is generally reasonable to remake massively steel scrap by means of melting process. The result of these analyses will be successively reported. In this first report, the objects of the remelting proccess of steelscrap are discussed. That is : - (1) The steel bath has to contain finally standard amount of Si, Mn, C uniformly mixed (2) has to have neccessary temperature, (3) its O content has to be kept in such amount as to be able to be removed with deoxydizing agents (4) it has to be not gasious (5) the slag contacting with it has to have less oxydising ability.

著者

山田 克美 井上 亮

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.100, no.7, pp.867-872, 2014 (Released:2014-06-30)

参考文献数

47

被引用文献数

3

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Metallic materials as represented by steels mostly contain various precipitates such as nitrides, carbides and inter-metallic compounds in addition to non-metallic inclusions, oxides and sulfides. These are present as an inevitable former or by design. Those varieties, size and distribution types are very wide then one of important structural factors that affects on various properties of materials.Therefore, accurate analysis of them is considerable significance to control target properties of materials reproducibly. In the steel research field, study of analytical methods for inclusion in steels has been actively conducting since 1960’s. Especially in chemical analysis method, systematization and standardization like JIS has been promoted by corroborated researches in an ISIJ. Previously established methods and detail of analysis of chemical states have been described in publications edited by ISIJ and comprehensive review paper has been issued by Takayama. In this short article, direct observation methods with microscopy, rapid analysis categorized as instrumental analyses, non-destructive inspections and extraction method for non-metallic inclusions are briefly reviewed.

著者

醍醐 市朗 後藤 芳一

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.100, no.6, pp.756-760, 2014 (Released:2014-05-31)

参考文献数

14

被引用文献数

1 7

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In this study, a random sample of 107 steel bars from Japan and 26 steel bars from China were studied. Each specimen’s elemental composition of tramp elements, such as Cu, Cr, Ni, and Sn, was analyzed. By using the compositions of specific tramp elements, 99 of the 107 samples and 16 of the 26 samples were recognized as electric arc furnace steel. The distributions of the tramp element composition were obtained for the Japanese steel bars and represent a larger number of samples than previous studies. Those for the Chinese samples are the first published data. The compositions of Cu, Cr, Ni, and Sn in the Japanese bars are statistically significantly higher than those in the Chinese bars. Owing to the large gap between the Cu contents of the Japanese and Chinese samples, and the statistically significantly differences between the ratios of Cu to both Ni and Cr in the Japanese and Chinese samples, it is highly likely that copper-based materials are separated from steel scrap at a higher rate in China. The relationship between the Cu and Cr compositions suggested that the mixing of copper-based materials and special steels, which contribute to Cr contamination, differs between Japan and China. The distributions of the Cr composition for each country had larger standard deviations than the distributions of other elements. The ratio of the Cr and Ni compositions in the Chinese samples is less than 2.25, resulting in 18% Cr and 8% Ni in stainless steel. It was found that Ni from materials other than stainless steel was likely to have been included.

著者

東 司 田中 泰彦 石黒 徹

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.76, no.5, pp.783-790, 1990-05-01

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Grain refining behavior during austenitizing of 3.5%Ni-Cr-Mo-V turbine rotor shaft steel was investigated. Special attention was paid on the effect of Ni content and role of fine carbide precipitates on the austenite transformation and migration of the acicular austenite grain boundary. The microscopic observation of grain refining behavior reveals the following results. (1) The grain refining of 3.5%Ni-Cr-Mo-V steels during austenitizing occurs through two stages. The first stage is austenite transformation which γ-phases succeed to the acicular bainitic ferrite structure. The second stage is the formation of equiaxed grain at higher temperatures by the migration of grain boundary of the acicular austenite. (2) Driving force of the grain boundary migration in the second stage is considered to be the high density defects in the acicular austenite. (3) Increase of Ni content stabilize the acicular γ-phases up to higher temperatures. This decreases the formation of equiaxed grain due to the migration of acicular austenite grain boundary. (4) Increase of V content makes the grain refining difficult because the fine carbide precipitate such as VC works as a barrier against the grain boundary migration required for the formation of equiaxed grain.

著者

村田 純教 鷹見 恭平 神谷 美紗紀 森永 正彦 橋詰 良吉 三木 一宏 東 司 石黒 徹

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.88, no.4, pp.214-221, 2002-04

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In recent advanced high Cr ferritic steels, it is known that the Laves phase precipitates during creep test when the steels contain a relatively high level of Mo+W content. The Laves phase is believed to be granular in shape and to exist in the boundaries of lath, block, packet and prior austenite grains, but a number of fine Laves-phase precipitates are found to exist even inside the martensite lath in the tempered steels containing 10 mass% Cr and 4.6 mass% W. The shape of this Laves phase is plate-like, and the size is below 300 nm. The crystallographic relationship between the fine Laves phase and the matrix phase is as follows; (111)_<ferrite>//(001)_<Laves> and [01^^-1]_<ferrite>//[110]_<Laves>. In the microstruc ture aged at 923 K for 7〜14 Ms, the fine precipitates of the Laves phase disappear inside the martensite lath, and coagulated Laves phase is observed at the lath-, block-, or packet- boundaries. Only the low C steel containing 0.08% C and 3% W shows a few amounts of the fine precipitates of the Laves phase after aging at 923 K for 7.268 Ms. This compositional dependence of the precipitation behaviour can be understood qualitatively with the aid ofthe System-Free-Energy Concept.

著者

角屋 好邦 馬越 龍太郎 河合 久孝 守中 康治 三上 真人 添田 暉平

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.87, no.8, pp.564-569, 2001-08

被引用文献数

1

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The 2.25CrMoV steel is applied to conventional combined high-pressure (HP) and low-pressure (LP) rotor forging, and it has excellent creep properties and toughness at 538℃ conventional steam temperature. However, at 566℃ steam temperature, it is required to improved the properties of the rotor forgings. The effects of chemistry on toughness and creep rupture strength have been investigated on the 9CrMoV base materials for the purpose of developing a new HP-LP rotor material for 566℃ steam temperature. Thus 9.8Cr1.4Mo1.0NiVNbN steel, named HLP9F, with higher toughness and creep rupture strength compared with conventional 2.25CrMoV steel, has been developed. A trail HP-LP rotor forging with the diameter of LP section of 1800mm and that of HP section of 1200mm has successfully been manufactured through the VCD process from 68t ingot. In spite of a large ingot, neither chemical composition change nor eutectic Nb(C, N) formation could be recognized. The rotor, furthermore, exhibited satisfactory quality in toughness and creep rupture strength. This rotor material is suitable to the HP-LP rotor material for advanced combined cycle steam turbine.

著者

吉岡 洋明 伊藤 裕道 田中 泰彦 池田 保 美

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.89, no.6, pp.705-710, 2003-06

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To meet the requirements for optimum utilization of power station sites and economic realization of coal fired thermal units, tandem compound 60 Hz 1000 MW large thermal units were developed. One of the most critical items was development of a large-size high strength generator rotor forging with comparable toughness to the conventional rotor forging. Based on the investigation results of existing rotor forging, chemistry optimization was conducted within the specification of conventional turbine generator and low pressure rotor forging by using lab oratory heat materials and 0.28%C-0.25%Mn-4%Ni-1.75%Cr-0.4%Mo-0.12%V high purity steel was selected for the candidate material. Double tempering heat treatment of 550℃ and 580℃ was also developed for increasing the yielding ratio of 0.02% yielding stress to tensile strength to meet the requirements of mechanical properties. According to those laboratory studies, one trial rotor forging with the same diameter as production ones was successfully produced.

著者

郡司 好喜

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.80, no.4, pp.N176-N186, 1994-04-01

被引用文献数

1

著者

松永 久 富永 忠男 王寺 睦満 田中 英夫

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.63, no.13, pp.1945-1952, 1977-11-01 (Released:2010-02-22)

参考文献数

36

被引用文献数

1

著者

長井 健介 篠原 康浩 津留 英司 石野 まゆ子 鈴木 徹也

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.98, no.6, pp.267-274, 2012 (Released:2012-05-31)

参考文献数

16

被引用文献数

1 3

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It has been well known that anisotropy in yield stress and the work-hardening rate is induced by pre-strain and aging. However, such an origin has not been adequately understood. In the present study, stress-strain curves in different directions were investigated after 2% pre-straining and post-heat treatment at 150°C in ferritic steel. When the applied strain path was changed to the orthogonal direction of the pre-straining path, the re-yield stress was lowered and the work-hardening rate in the low plastic strain was increased. The heat treatment following 2% pre-straining caused an increase of the re-yield stress in the parallel direction to the pre-strain and caused no change on the re-yield stress in the orthogonal direction. The work-hardening rate was increased in both directions after the heating. Electron back scatter diffraction pattern (EBSP) analysis was also conducted to measure the kernel average misorientation (KAM) value, which corresponded to the density of the geometrically necessary dislocation, on each [hkl]-oriented family grain for the pre-strained and the post-heated materials. The EBSP results indicated that heterogeneous work-hardening behavior among the [hkl]-oriented family grains could strongly effect the anisotropy induced by strain path change and aging.

著者

竹越 晋一 小山 力也 平松 大三 永尾 卓己

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.71, no.13, 1985-09-05

著者

佐々川 清

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.21, no.6, pp.473-480, 1935-06-25

著者

江見 俊彦

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.100, no.1, pp.31-58, 2014 (Released:2013-12-31)

参考文献数

87

被引用文献数

2 13

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Progress of steelmaking technology in Japan over the last 100 years is reviewed covering hot metal treatment, primary steelmaking with open hearth furnaces, converters and electric arc furnaces, secondary refining of steel with degassers and ladle furnaces, and ingot-/continuous-casting.Key issues that contributed considerably to the progress of the unit processes are highlighted with scientific, technological and engineering breakthroughs involved. Systematization of the unit processes, that optimized full cost, productivity and quality of steel products to meet the constraints on the resources and socioeconomic demands of the steel market at times, is depicted as another key issue for the successful systematization.Possible future development of steel technology is briefly commented on the basis of the above observation.

著者

長谷川 正義

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.57, no.14, pp.2169-2170, 1971-12-01 (Released:2010-10-12)

著者

田部 三郎

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.57, no.3, pp.629-645, 1971-03-01