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. 101 (2015), No. 12

  • Effects of Hydrogen and Nitrogen Gas Mixture on Nitrogen Absorption Rate in Low Carbon Steel Melt

    Seiji Nabeshima, Hisashi Ogawa, Yuji Miki

    pp. 627-635

    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-2015-026

    Abstract

    To clarify the effects of blowing a H2-N2 mixture onto the surface of molten steel containing various oxygen contents on the absorption reaction of nitrogen in the molten steel, experimental studies were carried out using a 20 kg induction furnace. Blowing of the H2-N2 mixture accelerates the nitrogen absorption rate because the oxygen concentration at the gas-metal interface is decreased by the reducing effect of the hydrogen gas. The apparent chemical reaction rate of nitrogen absorption in the present work was evaluated at almost the same reaction rate as that of desorption of nitrogen in previous works. Furthermore, a mathematical model for the nitrogen absorption and desorption reactions in a RH degasser was developed in order to estimate the contribution of each nitrogen reaction site during decarburization and killing treatment with injection of pure N2 gas or the H2-N2 mixture in the molten steel. Using the mathematical model, it was estimated that a larger increase in the nitrogen concentration during decarburization treatment could be achieved by applying a 30% H2-N2 mixture to the injection gas in the RH degasser than by applying pure N2 gas.

    Recommended Articles: Effect of Slag Melting Behavior on Metal-Slag Separation Temperature in Powdery Iron, Slag and Carbon Mixture [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Effect of Slag Melting Behavior on Metal-Slag Separation Temperature in Powdery Iron, Slag and Carbon Mixture Tetsu-to-Hagané Vol.98(2012), No.12
    2. Trickle Flow Behaviors of Liquid Iron and Molten Slag in the Lower Part of Blast Furnace Tetsu-to-Hagané Vol.100(2014), No.8
    3. Preface to the 100th Volume Memorial Special Issue on Ironmaking Tetsu-to-Hagané Vol.100(2014), No.2

  • Removal of Cu in Carbon Saturated Iron by Sulfurization via Ag Phase

    Katsuhiro Yamaguchi, Hideki Ono, Eiichi Takeuchi

    pp. 636-644

    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-2015-039

    Abstract

    The copper distribution ratio between the Na2S flux and silver, LCu(flux-Ag) (=[mass% Cu](in flux) / [mass% Cu](in Ag)), was measured at 1473 K in order to know the copper capacity of Na2S flux. As the greatest value, LCu(flux-Ag) = 42 was obtained. By combining the LCu(flux-Ag) value with the distribution ratio of copper between the silver and the carbon-saturated iron, LCu(Ag-Fe), the distribution ratio of copper between the Na2S flux and carbon-saturated iron, LCu(flux-Fe), is derived to be 330 at 1473 K. Moreover, the sulfurization removal of copper in iron silver phase into Na2S flux has been tried at 1473 K. Silver can keep iron from being sulfurized, which enables to maintain the high copper capacity of the Na2S flux. For this reason, the LCu value increases with an increase of sulfur potential. Copper removal proceeds at lower 0.1mass%Cu, and the Cu content decreased to 0.06mass%. The silver phase prevents the sulfur dissolution into the iron, and the sulfur content of iron can be kept lower ( [mass%S]in Fe-C < 0.007-0.02).

    Recommended Articles: Influence of Carbon Content on Toughening in Ultrafine Elongated Grain Structure Steels [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Influence of Carbon Content on Toughening in Ultrafine Elongated Grain Structure Steels Tetsu-to-Hagané Vol.100(2014), No.9
    2. Dislocation Theories Applied to the Elucidation of Mechanisms of Metal Strengthening Tetsu-to-Hagané Vol.100(2014), No.9
    3. Factors Affecting Static Strain Aging Under Stress at Room Temperature in a Fe-Mn-C Twinning-Induced Plasticity Steel Tetsu-to-Hagané Vol.100(2014), No.9

  • Kinetics of Iron Carburization via Slag Containing Sulfur at 1723 K

    Hirokazu Konishi, Hideki Ono, Kenji Tanizawa

    pp. 645-652

    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-2015-035

    Abstract

    Kinetics of iron carburization via CaO-SiO2-Al2O3 slag containing sulfur at 1723 K was investigated. The simulated blast-furnace (B.F.) slag (CaO/SiO2=1) containing sulfur and high basicity slag (CaO/SiO2=7.6) containing sulfur were prepared. The rate of carburization of iron through the high basicity slag containing sulfur was higher than the rate of carburization of iron through the simulated blast-furnace slag containing sulfur. Furthermore, the rate of carburization of iron through the slag containing sulfur was higher than the rate of carburization of iron through the slag without sulfur. On the other hand, the rates in the middle stage of carburization of iron through the slag containing sulfur were k=6.15×10–5 mol/m2·s (the simulated blast-furnace slag) and k=1.35×10–4 mol/m2·s (the high basicity slag), and were much higher than the other stages, and were influence by the existence of sulfur in the slag. The rates in the last stage of carburization of iron through the slag containing sulfur were k=2.95×10–5 mol/m2·s (the simulated blast-furnace slag) and k=6.21×10–5 mol/m2·s (the high basicity slag), and were closed to the rates carburization of iron through the slag without sulfur, and were not influenced by the existence of sulfur in the slag.

    Recommended Articles: Novel Two-step Simulation Method for the Dynamics of a Gas Jet-induced Depression on a Water Surface [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Novel Two-step Simulation Method for the Dynamics of a Gas Jet-induced Depression on a Water Surface Tetsu-to-Hagané Vol.101(2015), No.2
    2. Dynamic Behavior of Cavity Formed by a Top-blown Jet on Liquid Surface: Water Model Experiment Tetsu-to-Hagané Vol.101(2015), No.2
    3. Observation of Single and Continuous Bubbles Rising in Reduced Pressure Vessel Tetsu-to-Hagané Vol.101(2015), No.2

  • Effect of Natural Gas Injection into Blast Furnace on Combustion Efficiency of Pulverized Coal

    Akinori Murao, Yusuke Kashihara, Koichi Takahashi, Nobuyuki Oyama, Hidetoshi Matsuno, Michitaka Sato

    pp. 653-660

    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-2015-052

    Abstract

    Reducing CO2 emission in ironmaking process is pressing issue. Low RAR (reducing agent rate) operation of the blast furnace and the utilization of hydrogenous reducing agent are effective to reduce CO2 emission. In this study, the influence of the hydrogenous reducing agent on the combustibility of the pulverized coal was examined by using a small scale combustion furnace. As a result, the combustibility of the pulverized coal was improved by simultaneous injection of the pulverized coal and the hydrogenous reducing agent. Furthermore, the fundamental study about the effect of natural gas (CH4) injection point on the combustibility of the pulverized coal was conducted by experiment using above mentioned small scale combustion furnace and by three-dimensional numerical analysis for further high efficiency. In the case of the relative position of CH4 injection point and the pulverized coal injection point being near, the ignition point of the pulverized coal came closer to lance tip. Especially, in the case of CH4 injection point being upstream in blow pipe about 0 to 20 mm from the pulverized coal injection point, the fastest ignition of the pulverized coal was confirmed by experimental and calculation results.

    Recommended Articles: Preface to the 100th Volume Memorial Special Issue on Ironmaking [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Preface to the 100th Volume Memorial Special Issue on Ironmaking Tetsu-to-Hagané Vol.100(2014), No.2
    2. Effect of Random Pore Shape, Arrangement and Non-adhesion Grain Boundaries on Coke Strength Tetsu-to-Hagané Vol.100(2014), No.2
    3. Effect of Hydrogen Addition on Reduction Behavior of Ore Layer Mixed with Coke Tetsu-to-Hagané Vol.100(2014), No.2

  • Generation Mechanism of Unsteady Bulging in Continuous Casting-1 –Development of Measurement Method for Amount of Unsteady Bulging in Continuous Casting–

    Hiroyuki Ohno, Yuji Miki, Yuji Nishizawa

    pp. 661-666

    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-2015-031

    Abstract

    Fluctuation of inter-roll bulging in a commercial continuous casting machine was measured in consideration of the fluctuation of the relative distance from the segment to the ground, and compared to the cycle and volume fluctuation of the mold level. The following results were obtained.
    1. The amount of segment fluctuation was much smaller than the amount of inter-roll bulging. Therefore, segment fluctuation did not affect the measured results of inter-roll bulging.
    2. Inter-roll bulging and the mold level fluctuated with the same cycle, and this cycle corresponded to the cycle calculated from the roll pitch and casting speed. Therefore, it was confirmed that the value measured by an ultrasonic range finder in this study was unsteady bulging.
    3. The amplitude of the mold level converted from the amount of fluctuation of inter-roll bulging corresponded to the actual mold level. Therefore, the amount of fluctuation of inter-roll bulging measured in this study was considered reasonable.
    In addition, the unsteady bulging shape was estimated.

    Recommended Articles: Influence of Carbon Content on Toughening in Ultrafine Elongated Grain Structure Steels [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Influence of Carbon Content on Toughening in Ultrafine Elongated Grain Structure Steels Tetsu-to-Hagané Vol.100(2014), No.9
    2. Dislocation Theories Applied to the Elucidation of Mechanisms of Metal Strengthening Tetsu-to-Hagané Vol.100(2014), No.9
    3. Factors Affecting Static Strain Aging Under Stress at Room Temperature in a Fe-Mn-C Twinning-Induced Plasticity Steel Tetsu-to-Hagané Vol.100(2014), No.9

  • Generation Mechanism of Unsteady Bulging in Continuous Casting-2 –FEM Simulation for Generation Mechanism of Unsteady Bulging–

    Keigo Toishi, Yuji Miki

    pp. 667-672

    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-2015-032

    Abstract

    In the continuous casting of steel, unsteady bulging contribute to degradation of the slab quality. It has been reported that unsteady bulging is promoted by uneven solidified in the mold, but the effect of uneven solidified on unsteady bulging had not been clarified. In this study, a FEM (finite element model) simulation was constructed. Shell deformation was calculated by an elasto-plastic analysis assuming that the slab moves between the rolls, considering time dependency. The bulging value and mold level fluctuation, which change corresponding to the solidified shell thickness, ferrostatic pressure and roll pitch, were obtained.
    In the simulation results, the shell is deformed by ferrostatic pressure. The bulging shell pushes out under the rolls in the thickness direction, and unsteady bulging causes. While the shell is passing through the same pitch rolls, unsteady bulging becomes larger. When the solidified shell is uneven, stress concentrates on the thinner portions. The stress concentration accelerated the unsteady bulging even at the same average shell thickness. Based on this result, an operational index for suppressing unsteady bulging by reducing unevenness of the solidified shell is proposed.

    Recommended Articles: Influence of Carbon Content on Toughening in Ultrafine Elongated Grain Structure Steels [ View more ]

    x

    Readers Who Read This Article Also Read

    1. Influence of Carbon Content on Toughening in Ultrafine Elongated Grain Structure Steels Tetsu-to-Hagané Vol.100(2014), No.9
    2. Dislocation Theories Applied to the Elucidation of Mechanisms of Metal Strengthening Tetsu-to-Hagané Vol.100(2014), No.9
    3. Factors Affecting Static Strain Aging Under Stress at Room Temperature in a Fe-Mn-C Twinning-Induced Plasticity Steel Tetsu-to-Hagané Vol.100(2014), No.9
  • © 2015 The Iron and Steel Institute of Japan

Article Access Ranking

17 May. (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. Preface to the Special Issue on “Toward Suppression of Hydrogen Absorption and Hydrogen Embrittlement for Steels” ISIJ International Vol.61(2021), No.4
  3. Steam Reforming of Methane on Sponge Iron: Influence of Gas Composition on Reaction Rate ISIJ International Vol.61(2020), No.1
  4. A Visualization Method of Quantifying Carbon Combustion Energy in the Sintering Packed Bed ISIJ International Advance Publication
  5. Reaction Behaviors of Various Agglomerates in Reducing the Temperature of the Thermal Reserve Zone of the Blast Furnace Tetsu-to-Hagané Vol.107(2021), No.5
  6. Automatic Ultrasonic Testing of Non-metallic Inclusions Detectable with Size of Several Tens of Micrometers Using a Double Probe Technique along the Longitudinal Axis of a Small-diameter Bar ISIJ International Vol.61(2020), No.1
  7. Reaction Behaviors of Mixed Burdens Consisting of Pellets and Sintered Ores in an Experimental Blast Furnace Tetsu-to-Hagané Vol.107(2021), No.5
  8. Decarburizing Behavior and Its Effect on Mechanical Properties of Ultrahigh Strength Steel Sheets ISIJ International Vol.61(2021), No.4
  9. Comprehensive Research about Critical Interaction Region Named Cohesive Zone in Series of Dissected Blast Furnaces: A Review ISIJ International Advance Publication
  10. Review of Positron Lifetime Studies of Lattice Defects Formed during Tensile Deformation in a Hydrogen Environment ISIJ International Vol.61(2021), No.4

Search Phrase Ranking

17 May. (Last 30 Days)

  1. blast furnace
  2. activities in the liquid solution sio2-cao- mgo-al2o3 at 1600℃
  3. blast furnace permeability
  4. slag
  5. activity coefficient of ti in liquid iron
  6. blast furnace productivity
  7. coke oven gas injection
  8. desulfurization kr
  9. development and prospects of refining techniques in steelmaking process
  10. fe23cb6