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- Oct 11, 2013
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If they are "heavy, thick-bladed knives designed to be abused" then why chose a low toughness steel like CPM-20CV ?
Why not keep the tougher CPM-S35VN that was used before ? I have one XM-18 and one XM-24 in S35VN and, indeed, they are good hard-use folders. I never understood the switch to 20CV for these models.
Here is Larrin comment about M390/20CV toughness :
"The microstructure is relatively coarse for a powder metallurgy steel and it has a high volume of carbide, which means that the toughness of the steel is relatively low."
Hinderer try to compensate this intrinsic low toughness of 20CV by aiming for a low Rockwell hardness. That is clearly suboptimal. And 59-61 HRC is already a very large hardness window so it's disappointing to learn you can find specimens outside this window (on the low side).
Hey, no idea. I'm not a steel nerd, and have no idea why RHK would make that switch, other than to say that it's probably for the same reason all the other knife companies out there change steels: to satisfy a market who wants to see knives in those steels.