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Effect of FeO concentration in sinter iron ore on reduction behavior in a hydrogen-enriched blast furnace

International Journal of Minerals,Metallurgy and Materials 2022年第10期29卷 1820-1829页

作者： Ko-ichiro Ohno Takayuki Maeda Kazuya Kunitomo Masashi Hara Department of Materials Faculty of EngineeringKyushu University744 MotookaNishi-kuFukuoka 819-0395Japan Kashima Area East Nippon WorksNippon Steel Corporation3 HikariKashima CityIbaraki 314-0014Japan

Japan started the national project“COURSE 50”for CO_(2) reduction in the 2000s.This project aimed to establish novel technologies to reduce CO_(2) emissions with partially utilization of hydrogen in blast furnace-based ironmaking by 30%by around 2030 and use it for practical applications by 2050.The idea is that instead of coke,hydrogen is used as the reducing agent,leading to lower fossil fuel consumption in the process.It has been reported that the reduction behavior of hematite,magnetite,calcium ferrite,and slag in the sinter is different,and it is also considerably influenced by the sinter morphology.This study aimed to investigate the reduction behavior of sinters in hydrogen enriched blast furnace with different mineral morphologies in CO-CO_(2)-H2 mixed gas.As an experimental sample,two sinter samples with significantly different hematite and magnetite ratios were prepared to compare their reduction behaviors.The reduction of wustite to iron was carried out at 1000,900,and 800℃ in a CO-CO_(2)-H2 atmosphere for the mineral morphology-controlled sinter,and the following findings were obtained.The reduction rate of smaller amount of FeO led to faster increase of the reduction rate curve at the initial stage of reduction.Macro-observations of reduced samples showed that the reaction proceeded from the outer periphery of the sample toward the inside,and a reaction interface was observed where reduced iron and wustite coexisted.Micro-observations revealed three layers,namely,wustite single phase in the center zone of the sample,iron single phase in the outer periphery zone of the sample,and iron oxide-derived wustite FeO and iron,or calcium ferritederived wustite'FeO'and iron in the reaction interface zone.A two-interface unreacted core model was successfully applied for the kinetic analysis of the reduction reaction,and obtained temperature dependent expressions of the chemical reaction coefficients from each mineral phases.

关键词： hydrogen reduction wustite hematite magnetite calcium ferrite two-interface unreacted core model COURSE50

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Effects of Vertical Angle of Conical Punch on Stretch Flangeability of High Strength steel

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Acta Metallurgica Sinica(English Letters) 2015年第12期28卷 1503-1509页

作者： Yasuhiro Ito Yoshiaki Nakazawa Yukihisa Kuriyama Katsuyuki Suzuk Noriyuki Suzuki nippon steel and Sumitomo Metal corporation The University of Tokyo

To clarify the effects of the vertical angle of a conical punch on stretch flangeability, hole expansion forming tests were conducted. Test results showed that the hole expansion ratio becomes larger as the vertical angle decreases.Results also showed that the fracture strain at the fracture location on the hole edge was constant and independent of the vertical angle. This is because the hole expansion ratio was controlled not only by the fracture strain, which is independent of the vertical angle, but also by deformation uniformity along the hole edge. From the result of numerical analyses, it was determined that deformation uniformity depends on the gradient of circumferential stress along the radius direction. When the vertical angle is sharp, the circumferential stress showed a steep decline and the deformation localization was suppressed. Consequently, the hole edge deformed more uniformly and the hole expansion ratio became larger. It is concluded that in order to improve stretch flangeability of high strength steel, it is important to uniformly deform the hole edge by applying a conical punch with a sharp vertical angle.

关键词： Formability Ductile fracture Finite element analysis Hole expansion test

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Serrated flow accompanied with dynamic type transition of the Portevin-Le Chatelier effect in austenitic stainless steel

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Journal of Materials Science & Technology 2023年第2期133卷 154-164页

作者： Seung-Yong Lee Sita Chettri Ritupan Sarmah Chikako Takushima Jun-ichi Hamada Nobuo Nakada Department of Materials Science and Engineering Tokyo Institute of Technology4259 Nagatsuta-choMidori-kuYokohama-shiKanagawa-ken 226-8503Japan Department of Physics Tezpur UniversityNappamTezpur 784028India Research and Development Center Nippon Steel Stainless Steel CorporationHikari 743-8550Japan

In order to further understand high-temperature deformation behavior and its-related mechanical prop-erties,the Portevin-Le Chatelier(PLC)effect in an Fe-19Cr-13Ni-0.2C austenitic stainless steel was in-vestigated using high-temperature digital image correlation(DIC)analysis.Under the tensile testing at temperatures from 473 to 623 K,different types of serrated flow appeared even at a constant applied strain rate,and the type transition took place dynamically in a certain order with deformation time.DIC analysis revealed that the dynamic type transition of the serrated flow obeys the PLC band propagation behavior,and that the transition of the PLC band propagation behavior could be attributed to the PLC band nucleation manner.Numerical modeling also proved that the nucleation manner of PLC band nu-cleation is determined by the spatial-temporal coupling effect.

关键词： Dynamic strain aging(DSA) Austenitic stainless steel(γ-STS) Portevin-Le Chatelier(PLC)effect Digital image correlation(DIC) Local strain distribution

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Effect of steel Slag on Soil Fertility and Plant Growth

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Journal of Agricultural Chemistry and Environment 2022年第3期11卷 209-221页

作者： Zakirul Islam Quoc Thinh Tran Shohei Koizumi Fumitaka Kato Kimio Ito Kiwako S. Araki Motoki Kubo Department of Biotechnology Faculty of Life Sciences Ritsumeikan University Noji Higashi 1-1-1 Kusatsu Shiga Japan Advanced Technology Research Laboratories Research and Development Nippon Steel Corporation 20-1 Shintomi Futtsu Chiba Japan Resource and Process Solution Division Mineral Resources Department Nippon Steel Corporation 20-1 Shintomi Futtsu Chiba Japan

The effective utilization of steel slag, a byproduct produced in large quantities from the steel refining process, is an important issue. Because steel slag contains abundant mineral components, the effects of steel slag on soil bacterial biomass and plant mineral uptake were analyzed in this study. The soil pH increased in proportion to the amount of steel slag added. A lower concentration (0.2% to 1%) of steel slag addition did not change the bacterial biomass. However, a higher concentration of steel slag (above 1%) had a negative effect on bacterial biomass. A lower amount of steel slag (0.2% to 1%) addition in soil leads to increased mineral (Ca, Mg, and Fe) uptake and plant growth in Brassica rapa var. periviridis and Spinacia oleracea L. However, mineral uptake by the plants decreased when a large amount of steel slag (above 1%) was added to the soil. Low concentrations of steel slag (0.2% to 1%) in soil had positive effects on plant growth, mineral uptake of plants, and bacterial biomass.

关键词： Bacterial Biomass Mineral Uptake Nitrogen Circulation Phosphorus Circulation Plant Growth steel Slag

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Calculation of AF transformation kinetics in HSLA steel weld

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China Welding 2004年第1期13卷 46-50页

作者：张国栋潘春旭黄安国李志远余圣甫市川和利 Department of Physics Wuhan University School of Materials Science and Engineering Huazhong University of Science and Technology Welding & Joining Research Center Nippon Steel Corporation

It is of great importance for obtaining the perfect welding properties to control the acicular ferrite (AF) transformation behavior reasonably in steel weld. AF continuous transformation kinetics in the HSLA steel weld was calculated and modeled based on the direct growth on the inclusions inert interface. The simulation results are coincident with the experimental value well.

关键词： acicular ferrite high strength low alloy steel weld transformation kinetics modeling

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Probing the Inner Structure of a Blast Furnace by Cosmic-Ray Muon Radiography

Probing the Inner Structure of a Blast Furnace by Cosmic-Ray...

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第五届国际炼铁科技大会

作者： Akihiko Shinotake Shinroku Matsuzaki Kazuya Kunitomo Masaaki Naito Misao Hashimoto Asao Hatanaka Toshihiro Nagane Kanetada Nagamine Hiroyuki Tanaka Environment & Process Technology Center Nippon Steel Corporation Advanced Technology Research Laboratories Nippon Steel Corporation Head Office Nippon Steel Corporation Oita Works Nippon Steel Corporation

The visualization of the inner state of a blast furnace was investigated by exploiting the feature of cosmic-ray Muon that attenuates according to the density and the thickness of the object through which it penetrates. The distribution of the cosmic-ray Muon accumulated in an object in a blast furnace during a certain period has been determined by a probing system provided with two sets of a pair of panels with plastic scintillation counters segmented in parallel along each direction of both sides. Measurement was performed in the furnace hearth structure that had been taken out after the shutdown of Oita No.2 blast furnace repaired in 2004. The solid angle distribution of the amount of Muon penetration during a certain period was determined by the probing system located on a slant upward from the furnace bottom brick and the remaining iron in the furnace hearth structure. The average density of the object material in each azimuth was calculated on the basis of the accumulation ratio obtained from the relation between the intensity coming from the blast furnace side and that coming from the symmetrically opposite free space side. It was thus confirmed that the calculated average density was distributed according to that of the actual remaining brick and iron. Next, another measurement was performed in the same manner in the renewed furnace hearth of Oita No.2 blast furnace which had just started working after its repairs. The density of the material at the iron-rich portion inside the hearth was estimated from the accumulation ratio obtained from the relation between the intensity of the Muon channel passing through the iron-rich part in the hearth and that passing through its opposite channel symmetric to the coordinate origin. Then, the level of the furnace bottom brick, meaning its eroded thickness, was estimated from those accumulation ratios in relation to each channel crossing both the iron-rich part and the furnace bottom brick. The possibility of the density distribution of the material inside a blast fu

关键词： blast furnace refractory hearth measurement cosmic-ray muon radiography

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Photocatalytic Activity of Anodized Titanium Sheets under Ultra-Violet and Visible Light Irradiation

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Journal of Surface Engineered Materials and Advanced Technology 2014年第6期4卷 369-378页

作者： Michio Kaneko Kiyonori Tokuno Kazuo Yamagishi Takao Wada Tsuyoshi Hasegawa steel Research Laboratories Nippon Steel and Sumitomo Metal Corporation Futtsu Japan Head Office Nippon Steel and Sumitomo Metal Corporation Tokyo Japan Toyo Rikagaku Kenkyusho corporation Niigata Japan

A commercially pure titanium sheet precipitated TiC in the surface layer was fabricated by anodic oxidation in NH4NO3 solution and heat treatment in air. The fabricated sheet showed relatively high photocatalytic activity in 0.1 M KI solution, which was close to the activity level of the P-25 particle made by Degussa corporation. It exhibited photocatalytic activity in antifungal and antivirus tests under black light irradiation. The better photocatalytic activity under black light irradiation is considered to be related to the formation of anatase and rutile type titanium dioxides and rough surface. It also showed photocatalytic activity under visible light irradiation, which is considered to be attributable to carbon and nitrogen doping in titanium dioxide.

关键词： Photocatalysis Titanium Dioxide Anodic Oxidation Visible-Light Response Carbon-Doping

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Characterization of Surface Oxide Layers on Black-Colored Titanium

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Journal of Surface Engineered Materials and Advanced Technology 2018年第4期8卷 71-82页

作者： Michio Kaneko Kiyonori Tokuno Kazuo Yamagishi Takao Wada Tsuyoshi Hasegawa steel Research Laboratories Nippon Steel and Sumitomo Metal Corporation Shintomi Futtsu Japan Head Office Nippon Steel and Sumitomo Metal Corporation Tokyo Japan Toyo Rikagaku Kenkyusho corporation Tsubame Niigata Japan

Black-colored titanium was obtained by anodic oxidation of a commercially pure grade-1 titanium sheet in a 0.06 M NH4NO3 solution, followed by heat treatment at 773 K for 1 h in a vacuum furnace. The resulting oxide layer on the titanium substrate was examined by X-ray photoelectron spectroscopy, X-ray diffraction, glow discharge spectroscopy, and scanning electron microscopy. It was found that the oxide layer on the black-colored titanium sheet was several micrometers thick and mainly consisted of rutile TiO2 exhibiting a sponge like nanoporous structure. It is considered that the black-colored appearance of the titanium sheet is due to the sponge like nanoporous structure of the oxide layer absorbing the incident light. The photocatalytic activity of the black-colored titanium sheet was examined by observing the decomposition of a methylene blue (MB, C16H18N3SCl) solution under ultraviolet irradiation due to the existence of rutile TiO2. The sheet also exhibited photocatalytic activity under visible light irradiation. It is believed that the photocatalytic response upon irradiation with white light is due to carbon doping of the titanium oxide layer on the titanium substrate.

关键词： Titanium Titanium Oxide Titanium Dioxide Rutile Photocatalyst Visible Light Response Nanoporous Structure

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Hydraulic model tests for evaluating sediment control function with a grid-type Sabo dam in mountainous torrents

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International Journal of Sediment Research 2013年第4期28卷 511-522页

作者： Takahiro ITOH Shigeo HORIUCHI Takahisa MIZUYAMA Kazuhiko KAITSUKA nippon KOEI Co. Ltd Pasco corporation Graduate School of Agriculture Kyoto University nippon KOEI Co. Ltd.

There are two kinds of Sabo dams in order to control sediment transport by debris flow and flash floods in mountainous area,which arc closed and open-type’s dams.In Japan,open-type’s Sabo dams are constructed taking into account the continuity of sediment routing from upstream to downstream reach in a basin.A plan to construct a 20 m high grid-type Sabo dam which can capture a sediment volume of 400,000 nr is proposed in the Amahata river basin in Japan.Hydraulic model tests are conducted to decide on the section for a dam(Section A,B) and the grid size such as clearance of vertical/horizontal bars for evaluating the plan.Several runs of flume tests are conducted and the sediment control function of the Sabo dam is discussed using several experimental data such as dimensionlcss sediment runoff rate from Sabo dam,temporal changes of bed profile and mean diameter and so on.It was found that sediment deposition in sediment storage area of Sabo dam was affected by curved channel,and that next the grid size of steel bars and thirdly the section of a dam was able to capture sediment in storage area of Sabo dam.Sediment was controlled well in the section B and in the grid size of l.0×d95,and the problems related to sediment runoff after sediment capturing in Sabo dam are pointed out.

关键词： Hydraulic model tests Debris flow Grid-type Sabo dam Sediment storage

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Photocatalytic Activity of Titanium Dioxide Powder Fabricated from an Anodized Titanium Sheet under Ultra-Violet and Visible Light Irradiation

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Journal of Surface Engineered Materials and Advanced Technology 2017年第1期7卷 13-23页

作者： Michio Kaneko Kiyonori Tokuno Kazuo Yamagishi Takao Wada Tsuyoshi Hasegawa steel Research Laboratories Nippon Steel and Sumitomo Metal Corporation 20-1 Shintomi Futtsu Japan Head Office Nippon Steel and Sumitomo Metal Corporation Tokyo Japan Toyo Rikagaku Kenkyusho corporation Niigata Japan

A commercially pure titanium sheet with titanium carbide (TiC) precipitated in its surface layer was anodized in NH4NO3 aqueous solution and heat treated in air. The photocatalytic activity of titanium dioxide powder collected from the surface of the anodized titanium sheet was evaluated under ultra-violet and visible light irradiation. It showed relatively high photocatalytic activity in 0.1 mol/l potassium iodide solution, which was almost equal to the activity level of TiO2 powder (P-25) manufactured by Degussa corporation. The better photocatalytic activity under ultra-violet irradiation is considered to be related to the formation of anatase type titanium dioxide. Photocatalytic activity under visible light irradiation was also observed, which was considered to be attributable to impurity doping, (carbon), in the titanium dioxide powder.

关键词： Photocatalysis Titanium Titanium Dioxide Powder Anodic Oxidation Ultra-Violet Visible-Light Response

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