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

Tetsu-to-Hagané Vol. 52 (1966), No. 12

  • 随想

    pp. 1727-1728

    Bookmark

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

    Log in / Sign Up
  • On the Activity of Iron Oxide in the Silica-Saturated Slags

    pp. 1729-1737

    Bookmark

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

    Log in / Sign Up
    The general relationship between oxygen in the liquid iron and iron oxide in the slag is well understood as the distribution of oxygen.
    There are many reports dealing with the equilibrium between ternary slag FeO-CaO-SiO2 and FeO-MnO-SiO2 and oxygen in the liquid iron. And also, thermodynamical consideration on the variation in chemical properties of oxides in the slag has been made by many workers. It is, however considered that their theories involved in themselves some questions and assumptions. Authors measured the effects of the following oxides, namely, CaO, Al2O3, MnO, CrO, on the distribution of oxygen and examined the distribution coefficients of chromium for the quaternary system, FeO-CrO-CaO-SiO2 saturated with silica and liquid Fe-Cr alloy.
    Authors discussed on the questions whether or not the distribution of chromium in this system could be given as a linear function of iron oxide as shown by KORBER et al., or activity of iron oxide, the same as FeO-CrO-MnO-SiO2 system reported previously by authors.
    The equilibrium between the molten iron and the slag was studied in the silica crucible at 1600°C. The results obtained are summarized as follows.
    1) The effects of various oxides on the silica content in the silica saturated slag correspond to the melting point of its silicate.
    2) The solubility of oxygen decreases with an increase in the added oxide in FeO-SiO2 system. It is recognized that there exists some relationship between the diminution rate of oxygen and the strength in terms of the basicity of added oxide.
    3) The effects of various oxides on the activity of iron oxide are relatedwith the strength in terms of the basicity of added oxide. The activity of iron oxide was representedby the following empirical formula.
    aFeO=0.388-(1.30NM2+-1.14N2M2+)/√I
    where I refers to the ion-oxygen attraction.
    4) The equilibrium relation between three forms of oxygen in silicate melts as shown by RICHARDSON was studied for the ternary slags saturated with silica.
    The concentration of (O2-) was abruptly changed with the variation of cation in silica saturated slag.
    5) Distribution of chromium was obtained for the quaternary slag FeO-CaO-CrO-SiO2. The results show that the distribution coefficient of chromium is affected by CaO. And it can not be represented by the concentration of iron oxide as shown by KORBER et al., but by the activity of iron oxide. It showed good agreement with the results reported previously for the system FeO-CrO-MnO-SiO2 by authors.
    6) Expedient method of calculating the activity of iron oxide in the quaternary system can be obtained by using the activity of iron oxide in ternary system. The calculated values showed close agreement with the experimental results.
  • Kinetic Study of the Decarburization of Liquid Iron

    pp. 1738-1748

    Bookmark

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

    Log in / Sign Up
    Under various conditions the liquid iron-carbon alloys were oxidized by blowing A-O2 gas onto the surface of the melt and the decarburization process was followed by sampling either the melt or the gas phase. The results obtained are summarized as follows:
    1. In high carbon range the rate of decarburization is independent of the C content and increases in approximate proportion to the oxygen concentration in A-O2 gas. The O content remains constant before the C content reaches the critical values which depend on the oxygen concentration in the gas.
    2. In low carbon range the rate of carbon removal decreases as the C content decreases. The reaction was accompanied by the emission of iron oxide fume and an increase of the O content.
    3. When the alumina tube is situated at a distance of 25mm from the surface, the rate of carbon removal is independent of its area and, therefore, the reaction takes place merely on the small portion of the surface. Owing to the gaseous diffusion into the A-O2 gas stream, about 10 minutes is necessary for the decarburization to reach steady state.
    4. When the tube is located at a distance of 125mm, the rate of decarburization is much lower than in the case of 25mm within the range of oxygen concentration 0-40% and in this range the fume is evolved noticeably.
    5. In high carbon range the oxygen in the gas burns the evolved CO and the reaction O2+2CO=2CO2 goes on to completion at the flame front.
    6. The rate of decarburization increases as temperature lowers, especially in the case where the tube is located at a distance of 125mm.
    7. The mechanism of the formation of iron oxide fume is discussed in relation to the rate of vaporization of molten iron and the flux of CO2 which diffuses through the vapor phase.
    8. It is confirmed that in both ranges of C content the gaseous diffusion to the surface of the melt controls the decarburization in these experiments.
    x

    Readers Who Read This Article Also Read

    1. II 連続鋳造の凝固について Tetsu-to-Hagané Vol.56(1970), No.4
    2. 表面処理・その他 Tetsu-to-Hagané Vol.52(1966), No.11
    3. Manufacture of Superheater-Tubes and Its Properties of-17Cr-10Ni-1·5Mo-Cu-Nb-V Steel Tetsu-to-Hagané Vol.53(1967), No.11
  • Mass-Transfer from Solid Metal Cylinder into Liquid Metal

    pp. 1748-1762

    Bookmark

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

    Log in / Sign Up
    1) Mass-transfer coefficient, k, from rotated or static solid metal cylinder surface into liquid metal, was measured chemically or gravimetrically.
    In this report, steel-Al, steel-Zn, Cu-Pb, Zn-Hg and Sn-Hg were employed as the combination of solid metal cylinder-liquid metal bath.
    Correlation of mass-transfer coeff. to the physical properties of liquid metal, diffusion coeff., characteristic length of the cylinder and experimental conditions (temperature, speed of rotation, etc.) was analysed non-dimensionally.
    Results obtained are as follows:
    Jd=(k/U)(Sc)2/3=0.065(Re)-0.25: rotated cylinder
    (Sh)=0.124 (Gr·m×Sc)1/3: static cylinder
    2) These equations were rearranged to estimate the mass-transfer coeff. in the dissolution process of steel cylinder into liquid Fe-C alloy at about 1400°C.
    k=9.14×10-4 (L)-0.25(U)0.75: rotated cylinder
    k=1.17×10-2 (Δρ) 0.333: static cylinder
    Experimental results fairly agreed with the estimated values in the case of rotated cylinder but were about 30% lower than estimated values in the case of static cylinder, as averaged k.
    3) It would be concluded that the non-dimensional correlation of mass-transfer, predicted in common fluid at lower temperature, holds fairly well even with high temperature liquid metal such as Fe-C alloy at 1400°C in spite of technical difficulties of experiment at high temperature (especially in free convection) and the lack of the fundamental data on physical properties, diffusion coeff. of liquid metals.
  • TATARA…An Introduction to Traditional Steel Making Process of Japan

    pp. 1763-1778

    Bookmark

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

    Log in / Sign Up
    x

    Readers Who Read This Article Also Read

    1. Analysis of C + O = CO Reaction in Modified Tatara Steelmaking Furnace by Chemical Affinities Tetsu-to-Hagané Vol.87(2001), No.7
    2. Steelmaking Mechanisms for a Modified Tatara Furnace Tetsu-to-Hagané Vol.84(1998), No.10
    3. Role of "Kobune" in Underground Construction of Tatara Furnace Tetsu-to-Hagané Vol.87(2001), No.10
  • On the Future of Ironmaking

    pp. 1779-1790

    Bookmark

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

    Log in / Sign Up
  • 高温における低炭素鋼のクリープ破断試験結果のバラツキに関する共通試験

    pp. 1791-1806

    Bookmark

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

    Log in / Sign Up
  • 抄録

    pp. 1807-1814

    Bookmark

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

    Log in / Sign Up
  • 鉄鋼ニューズ

    pp. 1819-1820

    Bookmark

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

    Log in / Sign Up

Article Access Ranking

24 Jan. (Last 30 Days)

  1. Hydrogen Embrittlement Susceptibility Evaluation of Tempered Martensitic Steels Showing Different Fracture Surface Morphologies Tetsu-to-Hagané Vol.105(2019), No.1
  2. Effect of Annealing Time on Oxides Phases and Morphology along Oxidized Depth of Fe-3%Si Steel during Decarburization ISIJ International Vol.59(2019), No.1
  3. Heat Transfer Characteristic of Slit Nozzle Impingement on High-temperature Plate Surface ISIJ International Advance Publication
  4. Fusion Zone Microstructural Evolution of Al-10% Si Coated Hot Stamping Steel during Laser Welding ISIJ International Vol.59(2019), No.1
  5. A Review of the Chemistry, Structure and Formation Conditions of Silico-Ferrite of Calcium and Aluminum (‘SFCA’) Phases ISIJ International Vol.58(2018), No.12
  6. Effects of Sulfur and Titanium Interaction in Molten Pig Iron on Erosion of Carbon Brick ISIJ International Vol.59(2019), No.1
  7. Effects of Impurities and Processing Conditions in Al–1%Mn Alloys on the Formation of Thermally Stabilized Substructures MATERIALS TRANSACTIONS Vol.59(2018), No.11
  8. Preparation of High-Carbon Metallic Briquette for Blast Furnace Application ISIJ International Vol.59(2019), No.1
  9. Preface to the Special Topics Entitled “To Solve Problems of Hot Rolling Rolls” Tetsu-to-Hagané Vol.104(2018), No.12
  10. Preparation of ZnSO4·7H2O and Separation of Zinc from Blast Furnace Sludge by Leaching-Purification-Crystallization Method ISIJ International Vol.59(2019), No.1

Search Phrase Ranking

24 Jan. (Last 30 Days)

  1. blast furnace
  2. blast furnace permeability
  3. blast furnace productivity
  4. 鉄と鋼
  5. titanium
  6. induction furnace
  7. laser welder
  8. a
  9. activity feo
  10. b