Why is stainless steel prohibited for use in steam engine boilers?

I'm just taking a guess here, so I don't have any info to back me up, but it might have to do with the brittleness of each metal at working temperature - certain types of stainless steel could be more prone to sudden fracture at high temperatures (which would clearly be bad in a pressure vessel); copper probably remains fairly ductile, which could allow more advance warning near the point of failure before failing outright. Or, it could just be a simple matter of efficiency, the loss in conductivity associated with using stainless steel might outweigh the benefits in most situations.

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You will find the answer here and the related history.

http://en.wikipedia.org/wiki/Boiler

Hope this properly answers your question

Guru