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.
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