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. 98 (2012), No. 1

  • Dynamic Behavior of a Pair of Spheres Simultaneously Penetrating into a Water Bath

    Yusuke Sakai, Manabu Iguchi

    pp. 1-9

    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.98.1

    Abstract

    An understanding of the dynamic behaviors of poorly-wetted fine particles penetrating into molten steel is of essential importance for the enhancement of steel refining efficiency. Many water model experiments have been carried out on a poorly-wetted single sphere penetrating into molten steel. Information on the behaviors of more than two particles, however, is very limited. In this study, the behaviors of a pair of spheres penetrating into a water bath are observed with a high-speed camera. Particular attention is paid to an air cavity or air cavities formed behind the spheres because the cavity length affects the penetration depth which is closely associated with the refining efficiency.

  • Prevention of Adhesion of Alumina Inclusions onto Submerged Entry Nozzle by Refractory Material Containing MgO and Al

    Yutaka Awajiya, Mikio Suzuki, Keiji Watanabe, Koichi Tsutsumi, Yasuo Kishimoto, Jun Kubota

    pp. 10-18

    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.98.10

    Abstract

    Alumina adhesion to the submerged entry nozzle (SEN) causes serious problems in continuous casting, as it has a negative influence on the flow pattern in the mold and causes inflow of alumina inclusions to mold. The purpose of this research is to prevent alumina adhesion to the SEN. A new type of SEN which enables control of the interfacial tension gradient at the interface of the SEN and molten steel was developed. Removing sulfur on the SEN interface controlled interfacial tension, preventing alumina adhesion. Various experiments were performed to evaluate the quality of the SEN material. As a result, the optimum refractory material for preventing alumina adhesion was clarified. After evaluating the thermal shock characteristics of nozzles using the developed material, experiments were performed at an actual continuous casting machine, and reduced alumina adhesion was confirmed under commercial operating conditions.

    Recommended Articles: Decarburization Behavior of Molten Steel Using Top-blown Oxygen Jet under Reduced Pressure [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Decarburization Behavior of Molten Steel Using Top-blown Oxygen Jet under Reduced Pressure Tetsu-to-Hagané Vol.93(2007), No.4
    2. The Change in Composition of Inclusions in Molten Steel during Simultaneous Addition of Ca alloy and CaO–Al2O3 flux Tetsu-to-Hagané Vol.97(2011), No.5
    3. Separation of Inclusion through Swirl Flow in Immersion Nozzle Using Water Model Experiment Tetsu-to-Hagané Vol.90(2004), No.6

  • Effect of Accumulative Bending Conditions on Grain Refinement on Hot-rolled Sheet
    (Development of Grain Refining Technology by Accumulative Bending Process)

    Yukihiro Matsubara, Naoki Nakata, Toshiki Hiruta

    pp. 19-24

    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.98.19

    Abstract

    As a technology to manufacture fine-grained steel, accumulative bending process after hot rolling was proposed, and multi-bending equipment of laboratory scale were established. The effects of accumulative bending on microstructure and ferrite grain size by changing the thermomechanical conditions were investigated. As the results, a microstructure with the grain size of 2.2μm was obtained at specimen surface by accumulative bending after hot rolling in the optimized thermal condition. By the results of FE analysis, it was cleared that equivalent strain was accumulated on not only surface but also center of thickness.

  • Effect of Solution Nitriding on Microstructure and Hardness in 12%Cr Martensitic Stainless Steels

    Huynh Kinh Luan Ngo, Koichi Nakashima, Toshihiro Tsuchiyama, Setsuo Takaki

    pp. 25-31

    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.98.25

    Abstract

    Solution nitriding was applied to conventional 12%Cr stainless steels such as JIS SUS410L, SUS410, SUS420J1 and SUS420J2, and then the microstructure and hardness were examined for the as-quenched specimens as well as tempered ones. Nitrogen concentration was increased to around 0.28 mass% under the solution nitriding condition of 1473K-0.1MPa N2 in all of the 12%Cr steels regardless of the carbon content. Solid solution strengthening by nitrogen was relatively small compared with that by carbon in as-quenched martensite. However, solutionnitrided steels exhibited a remarkably large secondary hardening during tempering, which hardly appears in conventional martensitic stainless steels without nitrogen. TEM observation and X-ray analysis for extracted residue indicated that the secondary hardening by nitrogen was caused by precipitation of fine CrN nitride.

    Recommended Articles: Identification of Hydrogen Trapping Sites in a Strained Ferritic-martensitic Dual Phase Steel [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Identification of Hydrogen Trapping Sites in a Strained Ferritic-martensitic Dual Phase Steel Tetsu-to-Hagané Vol.104(2018), No.1
    2. Correlation between Charpy Transition Temperature and Brittle Crack Arrest Temperature Considering Texture Tetsu-to-Hagané Vol.98(2012), No.1
    3. Development of Steel Ladle Assignment Planning Algorithm Tetsu-to-Hagané Vol.104(2018), No.1

  • Correlation between Charpy Transition Temperature and Brittle Crack Arrest Temperature Considering Texture

    Tsunehisa Handa, Tetsuya Tagawa, Fumiyoshi Minami

    pp. 32-38

    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.98.32

    Abstract

    The correlation between ESSO test results and Charpy impact properties has been empirically proposed to qualify brittle crack arrest toughness, Kca of structural steels. The brittle crack arrest temperature TK6000 at Kca=6000N/mm3/2, conventionally used as a measure of crack arrest property, is interrelated generally with the Charpy transition temperature vTrs. However, ESSO test results occasionally deviates from the TK6000-vTrs correlation in some TMCP steels. Considering a thickness effect in ESSO test results, TK6000 was converted to a reference temperature 25TK6000 for 25mm thickness. Nevertheless, a scatter is found in 25TK6000-vTrs correlation.
    This study focuses on the effect of texture intensity on crack arrest properties. It is found that steel plates with texture show lower 25TK6000 than other steels without texture, even if the transition temperatures vTrs of these steels are on the same level. The role of the (211) texture is more significant than the (100) texture. A new parameter, vTrs (°C) -12X(100) -22X(211), is proposed in this study to correlate the crack arrest temperature 25TK6000 with the material properties of structural steels, where X(100) : pole density of (100) parallel to surface of steel plate, X(211): pole density of (211) parallel to surface of steel plate.

    Recommended Articles: Effect of Solution Nitriding on Microstructure and Hardness in 12%Cr Martensitic Stainless Steels [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Effect of Solution Nitriding on Microstructure and Hardness in 12%Cr Martensitic Stainless Steels Tetsu-to-Hagané Vol.98(2012), No.1
    2. Mechanism of Brittle Crack Arrest Toughness Improvement Due to Texture Tetsu-to-Hagané Vol.98(2012), No.10
    3. Estimation of Kca Value of Brittle Crack Arrest from Instrumented Charpy Test by a Modified Notch Specimen Tetsu-to-Hagané Vol.63(1977), No.2
  • © 2012 The Iron and Steel Institute of Japan

Article Access Ranking

21 Sep. (Last 30 Days)

  1. Formation and Evolution of Inclusions in High Chromium Steel ISIJ International Vol.61(2021), No.9
  2. Perspective toward Long-term Global Goal for Carbon Dioxide Mitigation in Steel Industry Tetsu-to-Hagané Vol.105(2019), No.6
  3. Effect of Heating Rate on Carbothermic Reduction and Melting Behavior of Iron Ore-Coal Composite Pellets ISIJ International Advance Publication
  4. Preface to the Special Issue on “Recent Progress in Inclusion/ Precipitate Engineering” ISIJ International Vol.61(2021), No.9
  5. Evaluation of Interfacial Energy between Molten Fe and Fe-18%Cr-9%Ni Alloy and Non-Metallic Inclusion-Type Oxides ISIJ International Vol.61(2021), No.9
  6. Production and Technology of Iron and Steel in Japan during 2020 ISIJ International Vol.61(2021), No.6
  7. Modeling of Wall Shear Stress Induced Inclusion Transport and Removal in Multi-Strand Tundish ISIJ International Vol.61(2021), No.9
  8. Three-dimensional Quantitative Evaluation of the Lamellar Curvature in Pearlitic Steel Based on an Orientation Analysis of Cementite ISIJ International Advance Publication
  9. Analysis of Air-Mist Cooling Effect for Coil in the Electromagnetic Induction Controlled Automated Steel Teeming System ISIJ International Vol.61(2021), No.9
  10. Simultaneous Analysis of Soluble and Insoluble Oxygen Contents in Steel Specimens Using Inert Gas Fusion Infrared Absorptiometry ISIJ International Vol.61(2021), No.9

Search Phrase Ranking

21 Sep. (Last 30 Days)

  1. blast furnace
  2. inconel 600
  3. blast furnace productivity
  4. miyamoto goro
  5. nozzle clogging
  6. b2o3 mold flux
  7. blue carbon
  8. investigation of arc behavior and temperature distribution corresponding to electrode and phase configurations in a multiphase ac arc
  9. ohno
  10. sei kimura