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Varies depending on the electroylite solution used (several). Can be hard to soft. Electroless Nickel is typically a more advanced form of (industrial) plating and the low phosphorus variety can achieve hardness's up to Rockwell "C" rated or HRC 60 which is very hard, like hardened steel.
So, is it an industrial coating (electroless) or is it being plated over steel to receive a chrome finish (automobile bumper)?
Typically the introduction of impurities into nickel actually makes it harder as pure nickel is quite soft and malleable.
Hope this helps.
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