Ken, I will have to withdraw my comment about the chrome surfacing. Since the idea was to apply the steel cladding to a aluminum sheet and then furnace braze
the part to an end housing nitriding might be too hot a process for the binding material used in the AL braze process. (Gas Nitride is usually done at about
900°F) The fact is that the aluminum will nitride as well which might make it brittle.
Bill Jepson

 
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