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Effect of rare earth additions on the inclusions and properties of a Ca-AI deoxidized steel

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Abstract

The effect of different amounts (0.35, 0.85, and 1.20 kg per tonne) of misch metal addition to three ingots of electric arc melted 20MnCr5 grade case-carburizing steel was examined. A minimum amount of REM is necessary to avoid an increased inclusion population which originates because of poor floatability of RE (Ca, Al, Mn) oxides formed with smaller additions. The cleanliness improves with increasing REM addition and formation of RE Sulfides and oxysulfides. The mechanical properties studied reflect the inclusion characteristics of the ingots. The hot ductility, room-temperature tensile and impact properties, and fatigue resistance of the steel respond in different manners to changes in inclusion parameters such as size, shape, distribution, and composition.

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Author information

Authors and Affiliations

  1. R & D Centre, Steel Authority of India Ltd., Ranchi-2, India

    S. K. Paul (Research Engineer)

  2. Maindra Ugine Steel Company Ltd., Khopoli, Maharastra, India

    A. K. Chakrabarty (Superintendent)

  3. R & D, Sandvik Asia Ltd., Bombay-Poona Road, 411012, Poona, India

    S. Basu (Manager)

Authors
  1. S. K. Paul
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  2. A. K. Chakrabarty
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  3. S. Basu
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Additional information

Formerly Research Scholar, Metallurgical Engineering Department, Indian Institute of Technology, Kharagpur

Formerly Senior Metallurgist, R & C Laboratory, Alloy Steel Plant, Durgapur

Formerly Assistant Professor, Materials Science Centre, Indian Institute of Technology, Kharagpur

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Paul, S.K., Chakrabarty, A.K. & Basu, S. Effect of rare earth additions on the inclusions and properties of a Ca-AI deoxidized steel. Metall Trans B 13, 185–192 (1982). https://doi.org/10.1007/BF02664575

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  • DOI: https://doi.org/10.1007/BF02664575

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