Metal Science and Heat Treatment

, Volume 24, Issue 4, pp 274–276 | Cite as

σ-Phase formation in chromium ferritic steels

  • A. S. Zubchenko
Stainless Steels


  1. 1.

    An increase in the nitrogen and carbon contents in chromium ferritic steels contributes to a slowing of the sigmatization process in the region of 600°C, i.e., at that temperature when the rate of sigmatization is maximum in the pure steels.

  2. 2.

    Contamination of chromium steels with molybdenum and aluminum expands the two-phase α+σ-region. Acceleration of σ-phase formation is observed simultaneously.

  3. 3.

    It is recommended that the temperature-time relationships plotted for the outset of σ-phase formation in chromium ferritic steels be used in selecting the heat-treatment regime.



Nitrogen Aluminum Chromium Molybdenum Carbon Content 


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Literature cited

  1. 1.
    F. Shortsleeve and M. Nikolson, Trans. Am. Soc. Met.,43, 143 (1951).Google Scholar
  2. 2.
    A. Cock and F. Jones, J. Iron Steel Inst.,148, No. 11, 217 (1943).Google Scholar

Copyright information

© Plenum Publishing Corporation 1982

Authors and Affiliations

  • A. S. Zubchenko

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