Steel Science Portal

Tetsu-to-Hagané
New Arrival Alert : OFF

You can use this feature after you logged into the site.
Please click the button below.

Log in / Sign up

Grid List Abstracts

ONLINE ISSN: 1883-2954
PRINT ISSN: 0021-1575

Tetsu-to-Hagané Vol. 102 (2016), No. 2

  • Effect of Ore Layer Thickness on Reduction Degree and Gas Permeability in High Temperature Properties Test

    Tsunehisa Nishimura, Kenichi Higuchi, Ko-ichiro Ohno, Kazuya Kunitomo

    pp. 61-67

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.2355/tetsutohagane.TETSU-2015-073

    Abstract

    To evaluate condition and distribution of reduction degree and gas permeability in ore layer, examinations of high temperature properties with various ore layer thickness were executed. Gas permeability begins to decrease from the upper part of ore layer, where melt with more FeO is formed with low reduction degree. Experimental results show that the difference of reduction degree in ore layer of examination of high temperature properties is about 40% at 1200°C. Estimation with mathematical model indicates that difference of reduction degree in ore layer increases with decreasing gas flow rate.

    Recommended Articles: Modeling of Dripping Behavior in Particles Packed Bed Filled with Immiscible Fluid [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Modeling of Dripping Behavior in Particles Packed Bed Filled with Immiscible Fluid Tetsu-to-Hagané Vol.97(2011), No.11
    2. Agenda for Low Reducing Agent Operation of Blast Furnace: Thermophysical Properties of Molten Slags on the Gas Permeability at the Dripping Zone of Blast Furnace Tetsu-to-Hagané Vol.100(2014), No.2
    3. Development of FCG (Flow Control Gate) Dynamic Control Technique at Mixed Charging of Massive Coke into Ore Layer Tetsu-to-Hagané Vol.98(2012), No.8

  • Fast and Continuous Analysis Method of Steel Pickling Solution Using Near-infrared Spectroscopy

    Masao Inose, Tomohiro Matsushima, Satoshi Kinoshiro, Kazunori Tahara, Shigeyuki Aizawa, Hideko Tanaka, Toshiki Ohara

    pp. 68-73

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.2355/tetsutohagane.TETSU-2015-074

    Abstract

    In the production line of steel sheet, surface of steel sheet is oxidized inevitably. So it is required to remove the oxide layer by acid pickling. It is very important for keeping the product quality stable to control the acid concentration in pickling process. With the increase in line speed of steel sheet, the acid concentration of pickling solution changes a lot in short time. Therefore, it makes difficult for a conventional chemical analysis to catch up the change of concentration.
    Nowadays, NIR (Near-Infrared spectroscopy) has attracted attention as a rapid analytical method to determine the concentration of solutions. Therefore we carried out examination using NIR to measure the concentration for acid pickling solutions in steel-making process.
    The NIR spectra in the region of 9500 cm–1 to 5000 cm–1 include OH bond of stretch first over-tone (6800 cm–1) were used. The OH peak shape of aqueous solutions are altered by the interaction between water and other different species. Total acid and Fe concentration were calculated by multivariate analysis using the NIR spectra of the solution that contains those ion. Furthermore, the multivariate analysis conditions were optimized to improve the correlation between NIR analysis value and the chemical analysis values.
    The correlation coefficient between NIR analysis values and chemical analysis values reached 0.98, which is good enough for operation. NIR analyzer enabled to measure multiple components at the same time in 1 minute. This system was also tested at an actual pickling line, and good correlations were obtained.

  • Effect of Deformation Resistance of Steel on Material Flow in Friction Stir Welding – In-situ Observation by X-ray Radiography –

    Yoshiaki Morisada, Zhe Lei, Hidetoshi Fujii, Muneo Matsushita, Rinsei Ikeda

    pp. 74-79

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.2355/tetsutohagane.TETSU-2015-054

    Abstract

    Material flow of steels with different composition in friction stir welding (FSW) was directly investigated by x-ray radiography. The three-dimensional flow patterns in various FSW conditions were obtained using two pairs of x-ray transmission real-time imaging systems. It revealed that the material flow pattern and the flow rate were tightly connected to the deformation resistance of the steel at process temperature. The material flow zone of the steel with higher carbon content, which has higher deformation resistance, was narrower, and its flow rate was lower than those of the steel with lower carbon content. The shape of the material flow zone around the rotating tool was changed from concentric to ellipse due to the stagnation of the material flow on advancing side (AS) in stir zone (SZ) under the insufficient heat-input FSW condition. Further decrement of the heat-input in FSW led to the defect on AS in SZ. The obtained relationship between the FSW conditions and the flow pattern showed that the lower travel speed of the tool is effective to keep the concentric shape so as not to form the defect for the steel with higher carbon content.

    Recommended Articles: Effect of Gravity on Arc Shape in GTA Welding [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Effect of Gravity on Arc Shape in GTA Welding QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY Vol.18(2000), No.3
    2. Microstructure and Toughness of Friction Stir Weld of Thick Structural Steel ISIJ International Vol.52(2012), No.7

  • Recrystallization Behavior of Cu Containing Ferritic Stainless Steel Sheet

    Jun-ichi Hamada, Norihiro Kanno

    pp. 80-88

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.2355/tetsutohagane.TETSU-2015-076

    Abstract

    The recrystallization behavior of Cu containing 17% Cr ferritic stainless steel cold-rolled sheets was investigated while evaluating the ε-Cu precipitation behavior during annealing. In the case of Cu in a solid solution before cold rolling, the recrystallization temperature of steel containing more than 1% Cu was high. It was thought that recrystallization was delayed because of the ε-Cu precipitation during annealing. The recrystallization temperature of 1.5%Cu-containing steel with fine ε-Cu precipitation because of aging for a short time before cold rolling was similar to that of Cu in solid solution before cold rolling. In contrast, in the case of coarse ε-Cu precipitation because of aging for long time before cold rolling, the recrystallization temperature decreased and was similar to that of steel with no Cu addition. In addition, the Cu-added steel had a weaker recrystallization texture than the no-Cu steel, but γ-fiber was developed because of aging for a long time before cold rolling. Consequently, the volume fraction and size of ε-Cu precipitation, which caused the recrystallization behavior, were examined quantitatively. The analysis based on the subgrain growth model considering a temperature change in the precipitation state such as the volume fraction and particle diameter using Thermo-Calc. and DICTRA was effective.

  • Mechanical Properties of Fe2Al5 and FeAl3 Intermetallic Phases at Ambient Temperature

    Tadashi Tsukahara, Naoki Takata, Satoru Kobayashi, Masao Takeyama

    pp. 89-95

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.2355/tetsutohagane.TETSU-2015-063

    Abstract

    In the present study, hardness, elastic modulus and fracture toughness of η-Fe2Al5 (oC24 structure) and θ-FeAl3 (mS102 structure) single phase alloys have been examined by various indentation methods. The average hardness of η and θ phases measured by Vickers indentation are 8.5 GPa and 7.8 GPa, respectively. The hardness variations are approximately 20% in η phase and 15% in θ phase, which are associated with their orientation dependence. A trend was found that the hardness becomes lower close to the [001] indentation direction in both phases. The elastic moduli of η and θ phases measured by nanoindentation are higher than the modulus of pure Fe (about 200 GPa). The fracture toughness of η and θ phases measured by indentation fracture method are 1.38 and 1.27 MPa·m1/2, respectively. The anisotropy of their toughness was not found in the present measurements.

  • Effect of Prior Microstructure on Mechanical Properties of Medium Carbon Pearlitic Steels After Spheroidizing Annealing

    Makoto Okonogi, Daisuke Hirakami, Takuya Hara, Hiromi Miura

    pp. 96-104

    Bookmark

    You can use this feature after you logged into the site.
    Please click the button below.

    Log in / Sign Up

    DOI:10.2355/tetsutohagane.TETSU-2015-070

    Abstract

    Machinery parts made from medium carbon steels are sometimes formed after spheroidizing annealing (SA). In order to improve the formability, it is necessary to reduce the yield strength and increase the reduction of area to fracture. In the present study, changes in the mechanical properties of medium carbon steel wire rods after SA were precisely investigated in relation to prior microstructure. In the steels with pearlite, the yield strength was drastically reduced and the reduction of area was raised after SA because of microstructural changes from pearlite to ferrite with dispersed spheroidized cementite. It was also found that the yield strength of ferrite with spheroidizing cementite depended sensitively on cementite-particle spacing as well as ferritic grain size. The reduction of area was, however, reduced as cementite size increased. The yield strength of the rod drawn in advance rapidly dropped after SA over 958 K, which was lower than that of ferrite steels with pearlite. Such changes in the mechanical properties after spheroidizing annealing could be reasonably understood from the difference in distribution of spheroidized cementite particles.

    Recommended Articles: Effect of Rolling Strain Rate on the Grain Size of Austenite Recrystallized Immediately after Hot Rolling [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Effect of Rolling Strain Rate on the Grain Size of Austenite Recrystallized Immediately after Hot Rolling Tetsu-to-Hagané Vol.70(1984), No.15
    2. Future Problems on Recrystallization and Texture of Steel Sheets Tetsu-to-Hagané Vol.70(1984), No.15
    3. Formation of Deformation Band and Static Recrystallization Behavior of Hot Rolled Fe-19%Cr Ferritic Alloy Tetsu-to-Hagané Vol.70(1984), No.15
  • © 2016 The Iron and Steel Institute of Japan

Article Access Ranking

19 Jun. (Last 30 Days)

  1. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  2. A Kinetic Model of Mass Transfer and Chemical Reactions at a Steel/Slag Interface under Effect of Interfacial Tensions ISIJ International Vol.59(2019), No.5
  3. Improvement of Sinter Strength and Reducibility through Promotion of Magnetite Ore Oxidation by Use of Separate Granulating Method ISIJ International Vol.59(2019), No.5
  4. Evaluation of the Structure and Strength of Coke with HPC Binder under Various Preparation Conditions ISIJ International Advance Publication
  5. Effect of a Zn Interlayer on the Adhesion Strength and Corrosion Resistance of Zn–Mg Coated TRIP Steel ISIJ International Vol.59(2019), No.6
  6. Numerical Investigation of Applying High-carbon Metallic Briquette in Blast Furnace Ironmaking ISIJ International Vol.59(2019), No.5
  7. Effects of Surface Microstructure on Selective Oxidation Morphology and Kinetics in N2 + 5%H2 Atmosphere with Variable Dew Point Temperature ISIJ International Vol.59(2019), No.5
  8. Evolution Mechanism of Inclusions in H13 Steel with Rare Earth Magnesium Alloy Addition ISIJ International Advance Publication
  9. Formation of Non-Metallic Inclusion and Acicular Ferrite in Ti–Zr Deoxidized Steel ISIJ International Advance Publication
  10. Effect of Nut Coke Addition on Physicochemical Behaviour of Pellet Bed in Ironmaking Blast Furnace ISIJ International Vol.59(2019), No.5

Search Phrase Ranking

19 Jun. (Last 30 Days)

  1. blast furnace
  2. blast furnace productivity
  3. blast furnace permeability
  4. deadman coke
  5. inclusions
  6. bubbling ladle
  7. isij xafs
  8. joo hyun park
  9. mold flux, b2o3
  10. phosphatability