annealed steel hardness

I have two samples of steel, one that is annealed, and one that is not.
Both samples are in the shapes of cylindrical pucks. In both samples,
the steel was found to be slightly harder on the inside of the sample
than on the outside, but the trend is slightly more noticeable in the
un-annealed sample. Any ideas as to why this is? Thanks!
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Any number of reasons: different steels, different heat treatments, different manufacturing process. What's the microstructure look like? What does un-annealed mean to you?
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Atlas Shrugged

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