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. 58 (1972), No. 2

  • 第3回日ソシンポジウムについて

    pp. 217-218

    Bookmark

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

    Log in / Sign Up
  • Thermodynamical Considerations on the Transfer of Si in Blast Furnace

    pp. 219-230

    Bookmark

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

    Log in / Sign Up
    In the case that FeO content in the blast furnace type slag controls the oxygen potential of the slag-metal system, Si content of iron in the hearth of blast furnace is higher than the equilibrium Si content calculated.
    Furthermore, the rate of the reduction of Si02 from molten slag by iron saturated with carbon is very slow, that is rsi10-5mol/cm2·min. Consequently, it seems to be unable to explain that Si content in pig iron produced from the practical blast furnace can reach to 0.5-1.0% by only the slag-metal reaction.
    It is proposed that the gas-molten metal reaction is predominant as the transfez of Si in the blast furnace.
    From the thermodynamical calculations, it has been deduced that Psio has the order of 10-2-10-3 atm. in strongly reducing atmosphere of high temperature and low oxygen pressure such as the region adjacent to the tuyer zone in blast furnace and that SiO is sufficient source of Si.
    It is considered that carbon content of iron plays an important role in themechanism of Si transfer.
    x

    Readers Who Read This Article Also Read

    1. Formation and Melt-Down of Softening-Melting Zone in Blast Furnace Tetsu-to-Hagané Vol.62(1976), No.5
    2. Capacities of Molten Slag Tetsu-to-Hagané Vol.81(1995), No.3
    3. Equilibrium between Fe0-MnO-SiO2 Slags and Molten Iron Tetsu-to-Hagané Vol.51(1965), No.6
  • The Transfer of Carbon from a Gas Phase to Molten Iron

    pp. 231-239

    Bookmark

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

    Log in / Sign Up
    As one of a series of experimental studies designed to establish the mechanism of Si transfer in the blast furnace, carburization of iron and iron-sulfur melts by CO gas has been carried out in the temperature range from 1570 to 1720°C.
    It was observed that the rate of carburization becomes larger as the temperature lower.
    The mechanism of carbon transfer has been proposed and the adsorption phenomena, an apparent activation energy for the reaction 2CO (g)→C+CO2 (g), and the effect of mass transfer in gas-liquid boundary layer have been considered both experimentally and theoretically. From this study, it is concluded that the carbon transfer from gas phase to molten iron may have minor contribution to the carburization in the blast furnace.
    x

    Readers Who Read This Article Also Read

    1. Formation and Melt-Down of Softening-Melting Zone in Blast Furnace Tetsu-to-Hagané Vol.62(1976), No.5
    2. Capacities of Molten Slag Tetsu-to-Hagané Vol.81(1995), No.3
    3. Equilibrium between Fe0-MnO-SiO2 Slags and Molten Iron Tetsu-to-Hagané Vol.51(1965), No.6
  • Abnormal Swelling on Pellet during Prereduced Process

    pp. 240-253

    Bookmark

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

    Log in / Sign Up
    An investigation has been made on the abnormal swelling during prereduced pellet firing.Ten kinds of iron ore and 3 kinds of solid reductant were tested.When pellet contained a reactive reductant, abnormal swelling occurred in some kinds of ore.This was found to be due to the growth of metallic filament in a pellet, which grew abruptly in the reduction at about 1000°C.
    The swelling was related to the unstable phase during reduction, or this may be attributed to (1) laminated structure, (2) strain within crystals, (3) weathering of ore, (4) incomplete recrystallization and so forth.
    From the experiment in which 2% of pyrite or 1% of sulphonic acid (S15.9%) was mixed with ores, it was found that sulphur addition was effective to prevent from swelling.However, sulphur addition was disadvantage with respect to pellet quality, because sulphur remained in pellet after reduction.
  • Study of the Kinetics of Gas-Metal Reactions

    pp. 254-266

    Bookmark

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

    Log in / Sign Up
    The rates of reaction of oxygen with liquid silver have been studied by blowing Ar-O2 mixtures onto the metal electrically heated both by resistance and by high frequency induction at 1000°C.
    Oxygen absorption into liquid silver is a first-order reaction, which is similar to nitrogen absorption into liquid iron, while oxygen desorption into the atmosphere of pure argon is virtually a second-order reaction, which is similar to nitrogen desorption into the same atmosphere.
    On the other hand, the rates of absorption and desorption near equilibrium oxygen concentrations are found to be equal. But the apparent first-and second-order reaction rate constants are both dependent on the oxygen partial pressure in the gas phase.
    These phenomena are explained by mixed-control model of first-and second-order reactions. The firstand second-order reaction rate constants are 0.022 cm/sec and 0.055 cm/%.sec. It is presumed that the former corresponds to mass transfer in the metal and the latter to surface reaction.
    The mixed-control model is applied to the reaction of nitrogen desorption from liquid iron.It is shown that with decrease of the nitrogen partial pressure and nitrogen concentration in the metal the kinetics changes gradually from a first-order to second-order reaction.
  • An Experiment on the Mechanism of the Formation of Oxide Inclusions Originated from Casting-Pit Refractories

    pp. 267-284

    Bookmark

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

    Log in / Sign Up
    In order to reduce the oxide inclusions originated from casting-pit refractories, the properties giving the influence on the wear by molten steel and slag were studied for commercial grade casting-pit refractories by laboratory test. The form and the quantity of these bricks entrapped into molten iron were also investigated.
    The results were summarized as follows.
    (1) It was recognized that semi-zircon brick (Zro2 40%) had excellent resistance to chemical attack by molten iron and slag, and high alumina brick and high silica brick (Sio2 81.5%) having a stable texture with moderate grain size distribution had good resistance to mechanical wear.
    (2) Discussion was made on the slagging mechanism of the bricks by the observation of change in quality of the bricks after slagging test.
    (3) The mineral composition of oxide inclusions entrapped into molten iron in the crucibles made of each tested brick were as follows.-wustite-fayalite (FeO-2FeO·SiO2) for Zro2-containing brick, silicate glass for high alumina brick, corundum crystallizing silicate glass for pyrophyllite and high silica brick, FeO-containing silicate glass for SiC-added pyrophyllite brick. The fine grains of each brick were also detected in molten iron.
    (4) Taking the experimental results on some properties of the bricks after slagging test into account, the tendency of entrapping bricks was considered.
    (5) It was considered that conventional pyrophyllite and high silica brick, having good texture with moderate grain size distribution, exhibited a relatively small tendency of entrapping, however these slagging products suspended in molten steel were possible to be a source of aluminate inclusions.
  • Anisotropies of Mechanical and Magnetic Properties in a Cold-Rolled and Aged 17-7 PH Steel

    pp. 285-292

    Bookmark

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

    Log in / Sign Up
    In a cold-rolled and aged 17-7 PH spring steel, the relations between the anisotropies of mechanical and magnetic properties and textures have been investigated.
    The rolling textures of martensite in 17-7 PH steel consist chiefly of two principal components, {211}‹011› and {100}‹011›, which are similar to those in mild steel. After aging the cold-rolled 17-7 PH steel, new component is not found in martensite, but a new component near {113}‹211› appears in austenite transformed reversely from martensite.
    After aging the cold-rolled 17-7 PH steel at around 500°C, the highest values of tensile strength and Young's modulus are obtained in the transverse direction to the rolling direction of sheet, and the highest residual induction is observed in the rolling direction.
    The magnetic torque curves of cold-rolled 17-7 PH sheet show the cubic anisotropy. However, uniaxial anisotropy increases rapidly by subsequent aging at around 650°C and the easy direction of magnetization is parallel to rolling direction.
    It may be concluded that the good spring material with ferromagnetism is obtained, when the iron-base alloys having semi-hard magnetic property and high Young's modulus are cold-rolled, cut parallel to the rolling direction and aged in the temperature range when the residual induction is increased and at the same time the coercive force is decreased.
  • Study of Brittle Fracture Surfaces at Low-Temperature in Relation to Microstructures of Low Carbon Steels

    pp. 293-305

    Bookmark

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

    Log in / Sign Up
    The brittle fracture surfaces of the ferrite-pearlite and the martensite structure in low carbon steels were investigated with a scanning electron microscope. The direct correspondence between the fracture surface and the microstructure was made, and the dependence of the fracture mode on grain size was studied from the view point of the crystallographic orientation relationship.
    The fracture surface prepared by the Charpy impact test revealed the discontinous fracture process; it consisted of the repetition of nucleation and propagation of the microcrack, and the cleavage plane was determined as {100} by the orientation measurements of the facet pit and the fracture surface. These microcrack propagation units could be considered as the fracture facets and those in ferrite-pearlite structure were composed of some adjacent grains in which the crystallographic orientation differences about fracture surface {100} were very small. The fracture facet was generally larger than the ferrite grain size, but it did not correspond to the austenite grain directly.
    The martensite structure, both as quenched and tempered, had the domains in which the crystallographic orientation of laths was uniform and the crack also nucleated and propagated in {100}.
  • Thermal Cycle Test of High Strength Steels and Steel Plates for Low Temperature Service

    pp. 306-316

    Bookmark

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

    Log in / Sign Up
    This paper presents the results of the investigation made into some factors govering the toughness of heat affected zone (HAZ) in welded steel plates.
    To examine the toughness of HAZ, a thermal cycle of welding from low heat input to high heat input was applied to 12 kinds of commercial steels comprising high strength steels and steels for low temperature service. The following results were obtained.
    When heat input is low the HAZ becomes lower bainitic structure or martensitic structure whose toughness is high. But with the increase of heat input, the structure changes to upper bainitic structure, while the toughness becomes lower.
    It is suggested from the above phenomena that the toughness of HAZ can be improved by adding some elements which serve to increase hardnability.
    Ni lowers vTrs of HAZ and a decrease in carbon content improves the toughness of upper bainite.
  • Corrosion of Pure Metals in Molten V2O5

    pp. 317-324

    Bookmark

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

    Log in / Sign Up
    The corrosion behavior of iron, cobalt, titanium, zirconium, nickel and chromium in molten V205 was investigated. The main results obtained are as follows:
    1) At the initial stage, the oxidation of iron and cobalt obeys the linear rate law. In the next stage, the oxidation is accelerated and then retarded at the final stage.
    2) The linear relationship at the initial stage implies that the oxidation reaction is diffusion controlled process.
    3) It is considered that the oxidation rate should be affected by composition of the melt which changes with progress of the oxidation.
    The oxidation rates of metals M in V2O5-MO melts were examined, and it was concluded that a) the oxidation rates of iron and cobalt are maximum at the eutectic composition, b) the oxidation rate of zirconium is less affected by the addition of ZrO2 in V2O5 melt, and c) as for nickel, the rate is retarded by adding NiO in V2O5 melt.
    4) The causes of the accelerated oxidation can be suggested to be 1) the increase of the oxidation rate and the enhancement of convection in the melt due to the increased temperature by exothermic oxidation reaction of the metal, 2) the increase of concentration of oxidizing agent in V205-M0 melt caused by the dissolved metal oxide, MO.
  • Present Status and Future Aspect on the Beneficiation of Pyritic Ores and Pyrite Cinder into High Gade Raw Materials for Iron Making

    pp. 325-342

    Bookmark

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

    Log in / Sign Up
  • Identification of the Character of Crystal Lattice Defects by Transmission Electron Microscopy

    pp. 343-359

    Bookmark

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

    Log in / Sign Up
  • 抄録

    pp. 360-368

    Bookmark

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

    Log in / Sign Up
  • 高炉内におけるSiOガスを媒介としたSi移行について

    pp. A1-A8

    Bookmark

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

    Log in / Sign Up
  • 鋼の遅れ破壊の研究に関する基礎工学的展望

    pp. A23-A38

    Bookmark

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

    Log in / Sign Up
  • BCC金属の異方塑性

    pp. A39-A48

    Bookmark

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

    Log in / Sign Up
  • 圧延材の疵検出について (厚板関係)

    pp. A49-A62

    Bookmark

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

    Log in / Sign Up
  • ステンレス鋼製鋼法の歴史的展望

    pp. A9-A22

    Bookmark

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

    Log in / Sign Up

Article Access Ranking

22 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. Hydrogen Embrittlement Susceptibility Evaluation of Tempered Martensitic Steels Showing Different Fracture Surface Morphologies Tetsu-to-Hagané Vol.105(2019), No.1
  3. Heat Transfer Characteristic of Slit Nozzle Impingement on High-temperature Plate Surface ISIJ International Advance Publication
  4. 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
  5. Preparation of High-Carbon Metallic Briquette for Blast Furnace Application ISIJ International Vol.59(2019), No.1
  6. Fusion Zone Microstructural Evolution of Al-10% Si Coated Hot Stamping Steel during Laser Welding ISIJ International Vol.59(2019), No.1
  7. 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
  8. Recent Progress on Advanced Blast Furnace Mathematical Models Based on Discrete Method ISIJ International Vol.54(2014), No.7
  9. Preface to the Special Topics Entitled “To Solve Problems of Hot Rolling Rolls” Tetsu-to-Hagané Vol.104(2018), No.12
  10. Effects of Sulfur and Titanium Interaction in Molten Pig Iron on Erosion of Carbon Brick ISIJ International Vol.59(2019), No.1

Search Phrase Ranking

22 Jan. (Last 30 Days)

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