Investigation into the cracking of inner cover of batch annealing furnace at bokaro steel plant

  • B. Sarkar
  • S. K. Shukla
  • S. Mukhopadhyay
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Abstract

A detailed metallurgical investigation was undertaken to ascertain the cause of the premature cracking of inner covers used in the batch annealing furnaces of Bokaro Steel Plant of the Steel Authority of India Limited (SAIL). It was found that the cracking was a result of the profuse precipitation of chromium carbide. Precipitation of chromium carbide sensitizes the steel to corrosion attack because of denudation of chromium from the matrix. Use of a properly stabilized austenitic stainless steel was recommended for prolonged life of the inner covers.

Keywords

austenitic stainless steel batch annealing inner cover sensitization 

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References

  1. 1.
    M.G. Fontana and N. Greene: Corrosion Engineering, McGraw Hill Publishing Co., 1978, pp. 58–59.Google Scholar
  2. 2.
    W.C. Leslie: The Physical Metallurgy of Steels, McGraw Hill Publishing Co., 1981, p. 356.Google Scholar
  3. 3.
    Properties and Selection: Irons, Steels, and High-Performance Alloys, vol. 1, Metals Handbook, 10th ed., ASM International, Materials Park, OH, 1990, pp. 948–49.Google Scholar

Copyright information

© ASM International 2006

Authors and Affiliations

  • B. Sarkar
    • 1
  • S. K. Shukla
    • 1
  • S. Mukhopadhyay
    • 2
  1. 1.Research and Development Center for Iron and Steel (RDCIS)Steel Authority of India Limited (SAIL)RanchiIndia
  2. 2.Research and Development Center for Iron and Steel (RDCIS)Bokaro Center, Steel Authority of India Limited (SAIL)BokaroIndia

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