Heat treated steel will soften if the temperature goes above the tempering temperature the steel was originally heat treated at.
If it is a chrome moly, it was probably tempered in the range of 750 to 1050 degrees F. Anything over that and there is a chance that it could have lost it's original hardness. Even over 750 degrees, if 750 was the tempering temperature.
Don't know for sure, but I suppose it could be re-heat treated.