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. 54 (1968), No. 6

  • 随想

    中谷 文忠

    pp. 641-642

    Bookmark

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

    Log in / Sign Up

  • The Effect of Ingot Size and Capping Time on the Distribution, Composition and Type of Non-Metallic Inclusion in Large Rimming Ingots

    Koichi ASANO, Tetsuro OHASHI, Yoshio NURI

    pp. 643-672

    Bookmark

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

    Log in / Sign Up

    Abstract

    The following results have been obtained through the study made on the subject.
    (1) Large non-metallic inclusions distribute mainly at the bottom part of an ingot. Whose compositions are (Fe, Mn) O, MnO-Al203 and Mn-Silicate. From the fact that larger inclusions have less value of MnO/FeO, coming closer to the composition of scum, it is estimated that large inclusionsstem partially from scum through rimming action. Since Ca is detected in the aluminate and silicate, they are considered to have origin in slag, refractory and deoxidation products.
    (2) With the “ingot parameter” Y-which is defined as ingot width/ingot thickness+0.02 (ingot height-width), relations between ingot dimensions and inclusion distribution and its composition can be clearly shown: when Y becomes bigger, total amount of inclusions and amount of large inclusions (more than 100μ) increase and the inclusions have less value of MnO/Fe0.
    The parameter Y is considered to have some relationship with thickness of viscous laver at the bottom part of ingot and with state of flow of rimming steel in the mold. Y therefore, is a good index to explain conditions of scum movement along rimming action, scum trap and precipitation of (Fe, Mn) O.
    (3) With shorter capping time, increase in total amount of inclusion is observed, but the amount of large inclusions decreases.
    This result is explained as follows:
    When capping time becomes shorter, more oxygen, which would be otherwise eliminated through rimming action as CO, remains to react with iron and manganese which results in higher amount of nclusion.
    Growth of inclusions is hindered as rimming action is terminated earlier, which results in less amount of large inclusions.

    Recommended Articles: On the Deoxidation of Liquid Iron with Argon-Calcium Bubbles [ View more ]

    x

    Readers Who Read This Article Also Read

    1. On the Deoxidation of Liquid Iron with Argon-Calcium Bubbles Tetsu-to-Hagané Vol.56(1970), No.8
    2. Some Consideration on the Mechanism of Deoxidation Reaction of Molten Steel Tetsu-to-Hagané Vol.51(1965), No.7
    3. Reaction between Fe-Mn Alloy and Synthetic Oxide at High Temperatures Tetsu-to-Hagané Vol.54(1968), No.2

  • Identification of σ-Phase in 25Cr-20Ni Heat-Resistant Cast Steel

    Tohei OTOTANI, Yasuzi KATAURA, Takashi SATO

    pp. 673-678

    Bookmark

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

    Log in / Sign Up

    Abstract

    Some experiments were carried out by means of X-ray diffraction, electrolytic isolation and potentiostatic etching technique, in order to make clear the relation between precipitated carbides and σ-phase in 25Cr-20Ni heat-resistant cast steel.
    The results obtained were summarized as follows:
    (1) When electrolytic residues contain more than 5wt% of σ-phase, it can be identified by X-ray diffraction method.
    (2) For the electrolytic isolation of σ-phase, 45wt% FeCl3 aq. solution showed a favourable result as compared with 10vol% HCl-C2H5OH solution.
    (3) Not only M7C3 is distinguishable from M23C6 carbide but also σ-phase from M23C6 by means of potentiostatic etching in 10 n-NaOH solution. At 200mV vs. Hg-HgO reference electrode M23C6 carbide is etched more rapidly than M7C3 carbide or σ-phase, at 500mV M23C6 and M7C3 carbides, or M23C6 and σ-phase are simultaneously etched, and at 600mV, σ-phase etched most rapidly.
    (4) From these investigations it was found that σ-phase may be possible to precipitate even in the prolonged heat treated cast steel containing 0.35% carbon.

  • On the Temperature Rise during Hot Rolling

    Isao KOZASU, Hiroyuki KUBOTA

    pp. 679-680

    Bookmark

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

    Log in / Sign Up

    Abstract

    The temperture rise due to hot rolling was qualitatively evaluated by rolling plates with inserted thermocouples. In rolling at high reductions, thermocouples were shortcircuited by oxidation scale in the vicinity of the junction. However, this was found to exert no influence on temperature readings.
    The temperature rise ranged between 10°C and 45°C for the conditions studied (1150-800°C, 10-40% reduction), and showed a better correlation with mean flow stress rather than with amount of plastic work in rolling.

  • On the Development of Cold-Rolling Textures in α-Iron

    Taichi KAMIJO

    pp. 681-690

    Bookmark

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

    Log in / Sign Up

    Abstract

    [in Japanese]

  • On the Quench-Aging of Steel

    Genjiro MIMA

    pp. 691-709

    Bookmark

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

    Log in / Sign Up

  • Strength of Quenched and Tempered Structures of Steel

    Tatsuro KUNITAKE

    pp. 710-722

    Bookmark

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

    Log in / Sign Up

  • 抄録

    pp. 723-727

    Bookmark

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

    Log in / Sign Up
  • © 1968 The Iron and Steel Institute of Japan

Article Access Ranking

18 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. Production and Technology of Iron and Steel in Japan during 2020 ISIJ International Vol.61(2021), No.6
  4. Preface to the Special Issue on “Recent Progress in Inclusion/ Precipitate Engineering” ISIJ International Vol.61(2021), No.9
  5. Effect of Heating Rate on Carbothermic Reduction and Melting Behavior of Iron Ore-Coal Composite Pellets ISIJ International Advance Publication
  6. Influence of Slag Viscosity and Composition on the Inclusion Content in Steel ISIJ International Advance Publication
  7. 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
  8. Modeling of Wall Shear Stress Induced Inclusion Transport and Removal in Multi-Strand Tundish ISIJ International Vol.61(2021), No.9
  9. Three-dimensional Quantitative Evaluation of the Lamellar Curvature in Pearlitic Steel Based on an Orientation Analysis of Cementite ISIJ International Advance Publication
  10. Effect of Ore Type and Gangue Content on Carburization and Melting Behavior of Carbon-Iron Ore Composite ISIJ International Vol.61(2021), No.6

Search Phrase Ranking

18 Sep. (Last 30 Days)

  1. blast furnace
  2. inconel 600
  3. miyamoto goro
  4. blast furnace productivity
  5. nozzle clogging
  6. sohei sukenaga
  7. b2o3 mold flux
  8. blue carbon
  9. crn
  10. goro miyamoto