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The Crucible data sheet on A2 has two peaks in toughness, at HRC 55 and HRC 60. They both show a Charpy C-notch value of 41 ft. lbs.
D2 has a broad peak between HRC 58 and 61, with the highest value at HRC 60 with Charpy C-notch value of 23 ft. lbs.
The Crucible data agree with those on other manufacturer's sites.
Timken is one of the suppliers for toolanddie.com. The other is Precision Marshall whose published specs figures agree with the above.
Both steels at HRC 60 are very impressive performers.
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Steve Hayden steve4663@gmail.com
Aztec, NM
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