The process of re chroming or indeed chrome plating can cause hydrogen embrittlement. Any process that increases hydrogen at the surface of a metal weakens the metal and can lead to premature failure. The process of increasing nitrogen at the surface toughen the metal (nitriding) I think hydrogen embrittlement can happen to a range of "ordinary" steels which would include a cast steel crank.
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Bluebell
Carrier Armoured O.P. No1 Mk3 W. T84991
Carrier Bren No2.Mk.I. NewZealand Railways. NZR.6.
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So many questions....
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