steel research international

Cover image for Vol. 84 Issue 6

June 2013

Volume 84, Issue 6

Pages 515–612

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      steel research int. 6/2013

      Article first published online: 6 JUN 2013 | DOI: 10.1002/srin.201390010

      Cover Photo: This front cover image reveals the surface vanadium element distribution map of the vanadium rich inclusion particle, which exists in the inner arc of continuous casting by means of SEM surface scanning. More details can be found in the article by M. M. Wu and co-workers on page 534.

  2. Contents

    1. Top of page
    2. Cover Picture
    3. Contents
    4. Full Papers
    1. steel research int. 6/2013 (pages 515–518)

      Article first published online: 6 JUN 2013 | DOI: 10.1002/srin.201390011

  3. Full Papers

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    1. A New Double Calcium Treatment Method for Clean Steel Refining (pages 519–525)

      Zhiyin Deng and Miaoyong Zhu

      Article first published online: 27 DEC 2012 | DOI: 10.1002/srin.201200250

      Thumbnail image of graphical abstract

      A new double calcium treatment method is proposed according to industrial experiment. In the new process, the evolution of inclusion is analyzed and the controlling standard of T.[Ca]/T.[O] ratio for calcium treatment is discussed. In order to get a good calcium treatment result, T.[Ca]/T.[O] ratio should be controlled above 0.91, and the ratio between 0.91 and 1.25 is suitable in present work.

    2. Reduction Kinetics of Metal Oxides by Hydrogen (pages 526–533)

      Jie Dang, Kuo-Chih Chou, Xiao-Jun Hu and Guo-Hua Zhang

      Article first published online: 20 DEC 2012 | DOI: 10.1002/srin.201200242

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      A new kinetic model has been developed for reduction of metal oxides with hydrogen under both isothermal and non-isothermal conditions. This model can describe the kinetics of single reductive reaction and double reductive reactions by considering the diffusion and chemical reaction controlling mechanisms. The model predicted curves agree well with the experimental results from the literatures.

    3. Research of the Continuous Casting Slab Transverse Cracking During Retarded Cooling Process (pages 534–544)

      MaoMeng Wu, Hao Yu, YonFei Fan, FengXian Wang and JianJing Wang

      Article first published online: 2 APR 2013 | DOI: 10.1002/srin.201200233

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      The reason of 50Mn2Vtransverse cracking is studied by a series of means, optical metallographic, SEM for microstructure, fracture surface andinclusions and insitu analysis for element segregation. In summary, internal gas pressureshould be the dominant factor that leads the transverseembrittlement of continuous casting blank, whileinadequate microstructure, internal stresses, element segregation, and defects play an ancillary role.

    4. Thermodynamics for Precipitation of CaS Bearing Inclusion and Their Deformation During Rolling Process for Al-Killed Ca-Treated Steel (pages 545–553)

      Jing Guo, Shusen Cheng, Zijian Cheng and Lei Xin

      Article first published online: 18 FEB 2013 | DOI: 10.1002/srin.201200253

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      The first type of duplex CaS bearing inclusion forms due to CaS precipitating directly surrounding solid inclusion core; the second type is as modified calcium aluminates react with dissolved sulfur and aluminum. During rolling, the outer CaS rich layer of the first type inclusion is easily separated from the inner core while the later one performs a better deformation.

    5. Evaluation of Sulfur Addition to the High Basicity Slag on the Sulfur, Aluminum, and Cleanliness of High Sulfur Al-Killed Molten Steel (pages 554–559)

      Fang Jiang, Guoguang Cheng, Guoyu Qian, You Xie, Qixuan Rui and Liang Yang

      Article first published online: 20 JAN 2013 | DOI: 10.1002/srin.201200187

      Thumbnail image of graphical abstract

      The addition of CaS into slag can reduce [S] loss in the molten steel. At time t = 360 s, the sulfur content in the molten steel decreases to <60% of the initial sulfur content, when no CaS is added into the slag (Heat 1), but the sulfur content in the molten steel decreases only to 80% of the initial sulfur content, when 5% CaS is added into the slag (Heat 3). The reason may be that after addition of CaS, the content of reaction product CaS in the slag has been increased, which suppressed the desulfurization reaction.

    6. Equilibrium Modeling of (Nb, Ti, V)(C, N) Precipitation in Austenite of Microalloyed Steels (pages 560–564)

      Yaowen Xu, Di Tang and Yong Song

      Article first published online: 20 JAN 2013 | DOI: 10.1002/srin.201200248

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      A simple theoretical model which is based on the solubility products of the individual nitrides and carbides was proposed to predict the equilibrium composition of multicomponent precipitates in Nb–V–Ti bearing steel. And the volume fraction of the second phase particles in equilibrium at given temperature can also be obtained by the developed model.

    7. Advanced Solute Conservation Equations for Dendritic Solidification Processes Part I: Experiments and Theory (pages 565–583)

      Mostafa Omar El-Bealy

      Article first published online: 17 APR 2013 | DOI: 10.1002/srin.201200228

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      Macrosegregation in dendritic equiaxed structure during the early stages of solidification of Al-4.5%Cu alloy has been studied experimentally. The metallurgical study includes macro-microstructure evaluation, measurements of grain size of equiaxed crystals, and macrosegregation analysis. In addition to the experimental work, there is a mathematical study which contains a complete derivation of local solute redistribution equations based on Fleming's approach under different solute diffusion mechanisms in the dendritic solid.

    8. Advanced Solute Conservation Equations for Dendritic Solidification Processes Part II: Numerical Simulations and Comparisons (pages 584–606)

      Mostafa Omar El-Bealy

      Article first published online: 3 APR 2013 | DOI: 10.1002/srin.201200237

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      The mathematical model of derived solute equations in Part I for equiaxed dendritic solidification with melt convection streams and thermal is applied numerically to predict macrosegregation distributions with different diffusing mechanisms in dendritic solid. Numerical and experimental results are present for solidification of a Al–4.5% Cu alloy inside horizontal rectangular cavity at different superheats.

    9. Study of New On-Line Pre-Hardening Technology of 3Cr2NiMo Plastic Die Steel (pages 607–612)

      Dong-Mei Zhu, Guo-Yong Liu, Shao-Jun Zhang and Mou-Wei Li

      Article first published online: 21 JAN 2013 | DOI: 10.1002/srin.201200251

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      New online pre-hardening equipment for quenching die steel has been developed. Based on the equipment, different online quenching processes of 3Cr2NiMo die steel plate with the thickness of 130 mm were performed by numerical simulation and production experiments. Under the optimal process, the tempering hardness difference was less than 3HRC in the whole 3Cr2NiMo steel plate, and there were no cracks in the steel plate.

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