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Quick HRC question #391 09/08/06 08:27 PM
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t1mpani Offline OP
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Just trying to clarify something (and willing to admit that it may be only myself that this is unclear to): Within the general Technical Specs section of the website, we have "The fact is that one of our transversion wave tempered SR-77 blades that tests out at 60 Rc will spank the living hell out of a standard heat treated knife blade out of the same material that also has a 60 Rc hardness."

And yet in the specifications listed for the Scrapper 6, "It features SR-77 steel, which is a slightly modified version of S-7 tool steel hardened to 55-57 Rc."

Now, I'm aware that you can have different heat treatments for different sizes/classes/intended applications of knives; I'm just wondering if that is the case here--where some other models of the Scrap Yard line will be at higher HRC--or if it is a typo on one page or the other. If it's not a typo, I wonder if someone could speak to why a medium sized knife like this one would receive a mid/high 50s HRC treatment when it likely isn't going to be employed for as much chopping/hacking and general impact work as some of its bigger brothers?

The discussion about HRC as not being the sole indicator of a knife's performance is very true, but all things being equal (meaning that Scrap Yard will put the same amount of care into a HRC60 blade as they will into a HRC55 blade which I think goes without saying) there will be behavioral differences between those two hardnesses, the softer favoring toughness in impact work and the harder favoring resistance to edge deformation.

'Splain Lucy, 'splain!

Re: Quick HRC question [Re: t1mpani] #392 09/08/06 08:41 PM
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hmmm...I see what you mean. I'd imagine that there's a typo in there somewhere. <img src="/ubbthreads/images/graemlins/confused.gif" alt="" />

Re: Quick HRC question [Re: t1mpani] #393 09/09/06 06:01 PM
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Just trying to clarify something (and willing to admit that it may be only myself that this is unclear to): Within the general Technical Specs section of the website, we have "The fact is that one of our transversion wave tempered SR-77 blades that tests out at 60 Rc will spank the living hell out of a standard heat treated knife blade out of the same material that also has a 60 Rc hardness."

And yet in the specifications listed for the Scrapper 6, "It features SR-77 steel, which is a slightly modified version of S-7 tool steel hardened to 55-57 Rc."

Now, I'm aware that you can have different heat treatments for different sizes/classes/intended applications of knives; I'm just wondering if that is the case here--where some other models of the Scrap Yard line will be at higher HRC--or if it is a typo on one page or the other. If it's not a typo, I wonder if someone could speak to why a medium sized knife like this one would receive a mid/high 50s HRC treatment when it likely isn't going to be employed for as much chopping/hacking and general impact work as some of its bigger brothers?

The discussion about HRC as not being the sole indicator of a knife's performance is very true, but all things being equal (meaning that Scrap Yard will put the same amount of care into a HRC60 blade as they will into a HRC55 blade which I think goes without saying) there will be behavioral differences between those two hardnesses, the softer favoring toughness in impact work and the harder favoring resistance to edge deformation.

'Splain Lucy, 'splain!

That's a TYPO from SYKCO. Sorry about that. We'll get that fixed ASAP.

Team SYKCO

Re: Quick HRC question [Re: Scrap Yard Knives] #394 09/09/06 06:31 PM
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I was a little confused as well. But, that's nothing new. Tom


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