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. 43 (1957), No. 8

  • STUDY ON THE BLAST FURNACE REACTION BY RAPID COOLING OF BURDENS

    pp. 785-790

    Bookmark

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

    Log in / Sign Up
    In the past decade, the authors have investigated on the low shaft furnace with an oval section which had a capacity of up to 10 tons per day. The charcoal pig iron produced by the furnace has been used as one of raw-materials for special steel. During the investigation the authors constructed some of pelletizing pilot plants and an experimental low shaft furnace with the same section as abovementioned. This furnace had a capacity of 0.6m3 corresponding to one ton per day pig iron.
    This report dealt with three times studies in regard to rapid cooling of burdens in other various experimental operations carried out with this pilot plant. The results obtained by our investigations were summarized as follows.
    (1) To correct the positions of the burdens after cooling was very important, because some effects of their shrinkages during N2 gas blowing were observed especially at upper parts of the shaft.
    (2) Segregation of the burdens was not found, while partial draft and super-heating was observed when a side tuyere had been one-sided.
    (3) Change of pellets shape began at the lower half of the bosh, and slag-formation and separation were observed.
    (4) Strength of charged pellet was weakened once at the halfway of the shaft, but the refractoriness of the pellet under load rised in proportion to increase of the degree of reduction of the pellt.
  • EQUILIBRIUM OF CARBON AND OXYGEN IN MOLTEN IRON SATURATED WITH CARBON (I)

    pp. 790-796

    Bookmark

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

    Log in / Sign Up
    A study was carried out on the equilibrium of carbon and oxygen in molten iron saturated with carbon at the temperature range of 1300-1600°C, by melting Fe-C alloys in a graphite crucible within the carbon monoxide and dioxide gas atomosphere in equilibrium with graphite. As the results of this experiment, it was proved that the carbon decreased the activity coefficient of oxygen in molten iron and the products of carbon and oxygen indicated exceedingly large values in carbon saturation. For the empirical formula indicating these relation, the following results were given.
    1. Solubility of graphite:
    2. Empirical formula indicating the equilibrium relation between the carbon and the oxygen in molten iron saturated with carbon:
  • STUDIES ON THE DESULPHURIZATION REACTION OF MOLTEN IRON WITH GAS (I)

    pp. 796-801

    Bookmark

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

    Log in / Sign Up
    The reaction rate were measured for the desulphurization of molten Fe-C-S alloys with oxygen gas by flow method.
    As the rates were proportional to the sulphur content and remained constant at a given sulphur content under the oxygen pressure between 50-500mmHg, the reaction was found to be of the first order with respect to the sulphur content. From the results that the recarburization reaction occurred during the reaction and the rate of carbon removal was proportional to square root of the oxygen pressure, it was shown that each of these two reactions took place independently in the melt.
    The rates of desulphurization were influenced by the content of carbon and that tendency corresponded with the activity of sulphur in the melt.
    The specific rate constants were much smaller than the lime slags.
  • STUDIES ON THE DESULPHURIZATION REACTION OF MOLTEN IRON WITH GAS (II)

    pp. 802-806

    Bookmark

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

    Log in / Sign Up
    The reaction rates were measured for the desulphurization of molten Fe-S and Fe-S-C alloys with hydrogen gas by flow method. The following results were found.
    As the rates were proportional to the sulphur content and its logarithm linearly changed to reaction time, the reaction was found to be of the first order with respect to sulphur.
    The rates of desulphurization were influenced by the content of sulphur and carbon, and that tendency corresponded with the activity of sulphur in the melt.
    The rate constant was much larger than that of oxygen gas and smaller than that of the lime slag.
  • THE DESULPHURIZATION OF MOLTEN STEEL BY CaC2 AND CaO

    pp. 807-812

    Bookmark

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

    Log in / Sign Up
    There are a few studies of the desulphurization of molten steel by CaC2 and CaO. In the present study, 200-350gr. of a low carbon steel was melted in a magnesia crucible, deoxidized by aluminum, and then covered the surface of molten steel by powders of CaC2 or CaO as the desulphuriser. The molten steel was reacted with it for 30-40min at 1550-1600°C, and sampled every 5min for the analysis of the sulphur and oxygen.
    The results were as follows:
    Using CaO only, the sulphur decreased from 0.09% to 0.03% during 15min but then incre- ased with time. The oxygen content of this melt was 0.003% at the initial stage and began to increase in parallel with the sulphur content for lack of the deoxidising power of CaO. By addition of carbon and silicon to the steel, as the oxygen content was retained less than 0.005% throughout the whole process, the flnal sulphur content decreased to 0.01% and hardly increased.
    Using CaC2, the sulphur content was dropped from 0.1% to 0.003% within about 15min and continued to decrease little by little. The final sulphur content depended on the initial oxygen content which was contained in molten steel before the desulphurization. The final sulphur content decreased to 0.01% in molten steel of 0.008% of the initial oxygen conteht, and 0.002% in molten steel of 0.002%.
    Whenever molten steel which was contained any oxygen content was treated by CaC2, the sulphur content decreased to lower value. Because CaC2 reacted on molten steel as an effective deoxidiser and desulphuriser.
    x

    Readers Who Read This Article Also Read

    1. Desulphurisation of Stainless Steel by Using CaO–Al2O3 Based Slags during Secondary Metallurgy ISIJ International Vol.53(2013), No.3
  • STUDIES ON MECHANICAL PROPERTIES OF TIMKEN 16-25-6 AT ELEVATED TEMPERATURES (IV)

    pp. 812-817

    Bookmark

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

    Log in / Sign Up
    The authors studied the lomg-time-creep-rupture properties at 600, 650 & 700°C and short-time-tensile-test properties at room and elevated temperatures of Timken 16-25-6 at the state of "hot-cold" working (hot cold worked at 700°C and 20% of reduction from as-forged, condition), as solution treated, and as precipitation hardened.
    The results were as follows:
    1. "Hot-cold" worked specimens had higher strength at the temperature below 700°C than in the other heat treated condition anq the ductility was also sufficient for practical use.
    But the effect of strain hardening decreased along with the increase of temperature and testing time, then the strength of "hot cold" worked specimens approaches to that of the other kind of heat treatment.
    2. The strength increased and reversely the ductility decreased by precipitation hardening during the elevated temperature testing. So, the precipitation-hardened specimens had lower strength and higher ductility than solution-treated specimens. This phenomenon was evident when specimens were tested at the testing temperature and time of which the rate of precipitation hardening was great. Therefore this effect was not clear in short-time-tensile-tests and long-time or high-tempesature creep rupture tests.
  • BEHAVIOR OF CARBIDES IN BALL-BEARING STEELS BY ELECTROLYTIC ISOLATION

    pp. 818-821

    Bookmark

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

    Log in / Sign Up
    The carbides of the ball bearing steels are isolated electrolytically and their nature is investigated. The results are as follows.
    (1) Electrolytic isolation of the carbide of the annealed ball-bearing steels is more effectively performed (its efficiency is about 92%). But in case of the hardened steels its efficiency falls to about 70-80%. In some material the matrix undissolves partly and contaminates the residue of the carbides.
    (2) The annealed ball-bearing steels contain the carbide about 15%. Cr, Mn, and V are contained more in the carbide and Ni in the matrix, and particularly Cr is conspicuous. In SKF steels Cr content of cementite is 9.23%, and in home-made steels 8.79%. The carbide contains 98% (SKF) and 93% (H.M) of the total Cr.
    (3) When the bearing steels are heated above A1, the chemical composition of the non-dissolved cementite changes as follows. Cr increases with the temperature, V also a little, Mn decreases first and increases somewhat afterwards.
    (4) The ball-bearing steels are usually hardened at 820-840°C, at this state the non-dissolved cementite content is 8-9% in SKF steels and 7-8% in home-made steels. The chemical compositions of the matrix are 0.5% C, 0.5-0.6% Cr and 0.2% Mn in SKF steels and 0.5% C, 0.6-0.7% Cr and 0.3% Mn in home-made steels.
    x

    Readers Who Read This Article Also Read

    1. Ball-Bearing Steel Made with a Vacuum Induction-Furnace Tetsu-to-Hagané Vol.45(1959), No.5
    2. STUDIES ON BALL-BEARING STEELS (III) Tetsu-to-Hagané Vol.41(1955), No.11
    3. A New Approach to Using Modelling for On-line Prediction of Sulphur and Hydrogen Removal during Ladle Refining ISIJ International Vol.44(2004), No.8
  • ON THE SHOT FOR PEENING (V)

    pp. 822-825

    Bookmark

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

    Log in / Sign Up
    The Society of Automotive Engineers, U.S.A. has recommended some methods of evaluating the quality of shot-peening, most of which are utilized widely in Japan. Accordingly, the measurements of archeight or coverage are commonly practised to control or to assure the effectiveness of peening operations.
    It was made clear, however, after study of some aspects of archeight, coverage and surface roughness under various hardness combinations of shots and specimens, that the above-mentioned SAE formulae are not always stable factors for verifying the peening effect and are valid under certain conditions.
    Furthermore, the possibility of "reflecting-surface shot-peening" is confirmed, and it's practical conditions or appicable ranges are fully explained.
  • UGINE-SEJOURNET EXTRUSION PROCESS

    pp. 826-848

    Bookmark

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

    Log in / Sign Up
  • HOW TO DEAL WITH IRREVERSIBLE PHENOMENA

    pp. 849-854

    Bookmark

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

    Log in / Sign Up
  • FIFTY YEARS OF PROGRESS IN ELECTRIC-ARC FURNACES

    pp. 855-858

    Bookmark

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

    Log in / Sign Up
  • 抄録

    pp. 859-863

    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. 864-864

    Bookmark

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

    Log in / Sign Up
  • 国内国外刊行誌参考記事目次

    pp. 865-866

    Bookmark

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

    Log in / Sign Up

Article Access Ranking

16 Jan. (Last 30 Days)

  1. 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
  2. Improving Blast Furnace Raceway Blockage Detection. Part 1: Classification of Blockage Events and Processing Framework ISIJ International Advance Publication
  3. Phase Transformation Behavior of Oxide Scale on Plain Carbon Steel Containing 0.4 wt.% Cr during Continuous Cooling ISIJ International Vol.58(2018), No.12
  4. Hydrogen Embrittlement Susceptibility Evaluation of Tempered Martensitic Steels Showing Different Fracture Surface Morphologies Tetsu-to-Hagané Vol.105(2019), No.1
  5. Improvement of Sinter Productivity by Control of Magnetite Ore Segregation in Sintering Bed ISIJ International Vol.58(2018), No.12
  6. Gasification and Migration of Phosphorus from High-phosphorus Iron Ore during Carbothermal Reduction ISIJ International Vol.58(2018), No.12
  7. Effect of TiO2 and MnO on Viscosity of Blast Furnace Slag and Thermodynamic Analysis ISIJ International Vol.58(2018), No.12
  8. Effect of Coke Size on Reducing Agent Ratio (RAR) in Blast Furnace ISIJ International Vol.58(2018), No.12
  9. High Temperature Thermal Diffusivity Measurement for FeO Scale by Electrical-Optical Hybrid Pulse-Heating Method ISIJ International Vol.58(2018), No.12
  10. Improving Blast Furnace Raceway Blockage Detection. Part 3: Visual Detection Based on Tuyere Camera Images ISIJ International Advance Publication

Search Phrase Ranking

16 Jan. (Last 30 Days)

  1. blast furnace
  2. blast furnace permeability
  3. blast furnace productivity
  4. 鉄と鋼
  5. continous annealing
  6. laser welder
  7. titanium
  8. a
  9. activity feo
  10. argon steel