That's the range for Zmax. I think he was referring to where it said Zmax was comparable to T15. I would expect something around 65-67 hrc.
The app is z-knives. I have no idea how accurate it is.
Manixguy@1994 wrote: ↑Fri Jan 06, 2023 10:58 amThis steel is so interesting and after reading up on it , just may have to order one . Dan
legOFwhat? wrote: ↑Fri Jan 06, 2023 10:20 amThe app is z-knives. I have no idea how accurate it is.
I’ve have been behind reading up about this steel . I recently read Dr. Larrin’s article on his site and was impressed. I also think it is time for me to give a tool steel Mule a try . Nothing really earth shattering just good information and history of the steel . DanBolster wrote: ↑Fri Jan 06, 2023 4:04 pmManixguy@1994 wrote: ↑Fri Jan 06, 2023 10:58 amThis steel is so interesting and after reading up on it , just may have to order one . Dan
Don't keep it to yourself, ManixMan--share the knowledge! What did you discover?
legOFwhat? wrote: ↑Fri Jan 06, 2023 10:20 amThe app is z-knives. I have no idea how accurate it is.
Must be Android only. Couldn't find for iPhone. All I can find is a game that features a knife-wielding bunny. And absolutely no info on the steel that's used in the bunny's knife.
WAIT. Here it is, in Apple App Store called "Knife Steel Composition Chart." Thanks, Leg.
I think people get caught up on charpy toughness a little too much. It doesn't really correlate to edge stability in my experience. It does a good job showing what happens at the limit but not below. There's two failure modes for steel ductile and brittle. If the steel is ductile it will deform before it fractures giving higher toughness numbers. A brittle steel will just hold form until failure resulting in lower numbers. I think what happens before the limit might be more important than where that limit is.Bolster wrote: ↑Sat Jan 07, 2023 11:32 amRe-upping one of Dr. Larrin's graphics that gives some context for T15. IIRC, Larrin drew the curves in the neighborhood of the best examples of tool steel, rather than through all the examples.* In other words, I don't think the curve represents a quadratic regression curve attempting to fit all the tool steel points. If true, then I suspect that T15 is not necessarily a laggard that's "behind the curve," I'm guessing (trying to fit a regression curve by eye, yes, dangerous) that T15 is probably about where you'd expect it to be for toughness, given its CATRA scores. Bested by Vanadis 8, but outshining Rex 76, in this graphic.
*A little confusing since the stainless steel curve appears to be more in the swarm of points. But I'm still guessing these are not regression-fit curves, since Dr. Thomas didn't include the formula for the line. If they were regression curves they'd probably have a formula attached.
Cutting a nail and a lateral deformation test is better for a knife steel test.Josh Crutchley wrote: ↑Sun Jan 08, 2023 7:02 pmI think people get caught up on charpy toughness a little too much. It doesn't really correlate to edge stability in my experience. It does a good job showing what happens at the limit but not below. There's two failure modes for steel ductile and brittle. If the steel is ductile it will deform before it fractures giving higher toughness numbers. A brittle steel will just hold form until failure resulting in lower numbers. I think what happens before the limit might be more important than where that limit is.Bolster wrote: ↑Sat Jan 07, 2023 11:32 amRe-upping one of Dr. Larrin's graphics that gives some context for T15. IIRC, Larrin drew the curves in the neighborhood of the best examples of tool steel, rather than through all the examples.* In other words, I don't think the curve represents a quadratic regression curve attempting to fit all the tool steel points. If true, then I suspect that T15 is not necessarily a laggard that's "behind the curve," I'm guessing (trying to fit a regression curve by eye, yes, dangerous) that T15 is probably about where you'd expect it to be for toughness, given its CATRA scores. Bested by Vanadis 8, but outshining Rex 76, in this graphic.
*A little confusing since the stainless steel curve appears to be more in the swarm of points. But I'm still guessing these are not regression-fit curves, since Dr. Thomas didn't include the formula for the line. If they were regression curves they'd probably have a formula attached.
Intervention time. Are the carbides in the room with you now?Tucson Tom wrote: ↑Wed Feb 08, 2023 9:30 pmInteresting that Rex45 and Rex76 are close neighbors on that chart. Two of my absolute favorite steels.
I used to cry every night that there was no Rex-45 mule, but the Rex-76 mule took all the tears away.
I cannot speak to your other points, but I do find it curious that many peoples favorite steels fall right in between the two curves.Bolster wrote: ↑Sat Jan 07, 2023 11:32 amRe-upping one of Dr. Larrin's graphics that gives some context for T15. IIRC, Larrin drew the curves in the neighborhood of the best examples of tool steel, rather than through all the examples.* In other words, I don't think the curve represents a quadratic regression curve attempting to fit all the tool steel points. If true, then I suspect that T15 is not necessarily a laggard that's "behind the curve," I'm guessing (trying to fit a regression curve by eye, yes, dangerous) that T15 is probably about where you'd expect it to be for toughness, given its CATRA scores. Bested by Vanadis 8, but outshining Rex 76, in this graphic.
*A little confusing since the stainless steel curve appears to be more in the swarm of points. But I'm still guessing these are not regression-fit curves, since Dr. Thomas didn't include the formula for the line. If they were regression curves they'd probably have a formula attached.
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