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- Jul 28, 2002
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Please excuse my lack of knowledge in regards to metal types but if I don't ask I will not learn.
Question is the subject. Thanks

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Originally posted by jefroman
420HC is tougher than 154CM?
Jeff
Originally posted by frank k
Toughness in terms of strength of materials means impact strength, although some use the term to imply other things.
154CM is in fact tougher (higher impact strength) than 420HC (given typical heat treatments used for knives). Buck posted some Charpy impact strength information on 420HC(RC58) and ATS34(RC60) here:
http://www.buckknives.com/cms/index.php?ID=28
Since ATS34 and 154CM are the same except for the steel maker (Hitachi vs Crucible), 154CM should perform about the same as ATS34.
The impact strengths given by Buck are 3 ft*lbs for 420HC and 4.5 ft*lbs for ATS34.