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by Larrin
Fri Feb 19, 2021 5:35 pm
Forum: Spyderco General Discussion
Topic: Has K390 "obsoleted" M4/REX45/HAP40?
Replies: 50
Views: 1741

Re: Has K390 "obsoleted" M4/REX45/HAP40?

I don’t know what K390 has to do with those high speed steels.
by Larrin
Tue Feb 16, 2021 9:26 am
Forum: Spyderco General Discussion
Topic: Friction forging? Anyone heard of this?
Replies: 12
Views: 495

Re: Friction forging? Anyone heard of this?

Yes I wrote about it, thanks Pokey. The technology is somewhat interesting though performance claims can be exaggerated, of course.
by Larrin
Sat Feb 13, 2021 2:32 pm
Forum: Spyderco General Discussion
Topic: Re: SE H1 vs SE LC200N (NOT by Wartstein, OP seems to be gone)
Replies: 33
Views: 721

Re: SE H1 vs SE LC200N

Haunted House wrote:
Sat Feb 13, 2021 10:38 am
@Larrin,
Can you explain how LC200N can have better edge retention than H1 in plain edge but not serrated?

What’s the science behind that?
I have a hard time believing that is true. Perhaps if I saw the raw data including the edge geometry measurements I could be convinced.
by Larrin
Sat Feb 13, 2021 9:31 am
Forum: Spyderco General Discussion
Topic: Re: SE H1 vs SE LC200N (NOT by Wartstein, OP seems to be gone)
Replies: 33
Views: 721

Re: SE H1 vs SE LC200N

The only serrated blade I tested was VG10 and it didn't dull during the 200 cut test (it's longer for serrated testing). So I don't know how H1 would do better than perfect. Either the H1 tested had the thinnest serrated edge they had ever put on the machine or they were comparing the increase in pe...
by Larrin
Fri Feb 12, 2021 5:19 pm
Forum: Spyderco General Discussion
Topic: Re: SE H1 vs SE LC200N (NOT by Wartstein, OP seems to be gone)
Replies: 33
Views: 721

Re: SE H1 vs SE LC200N

Any steel has better slicing edge retention while serrated than with a plain edge. Maybe Eric was saying something else.
by Larrin
Fri Jan 29, 2021 6:48 pm
Forum: Spyderco General Discussion
Topic: What are Matrix steels? YXR7, CPM-1V, Caldie, and More
Replies: 13
Views: 597

Re: What are Matrix steels? YXR7, CPM-1V, Caldie, and More

I don’t know if HAP-5R qualifies as a matrix steel but the definition is murky. AEB-L has the benefit of being made up of chromium carbides. Vanadium carbides are a bit harder to keep small. Look at even Caldie, for example, with only 0.5% V but the carbides are larger than AEB-L. Once you get up to...
by Larrin
Tue Jan 26, 2021 8:01 pm
Forum: Spyderco General Discussion
Topic: What are Matrix steels? YXR7, CPM-1V, Caldie, and More
Replies: 13
Views: 597

Re: What are Matrix steels? YXR7, CPM-1V, Caldie, and More

Baron Mind wrote:
Tue Jan 26, 2021 6:46 pm
I enjoyed the article. Thank you for helping make this hobby awesome. I think I'll try to sign up for your Patreon again.
Thanks!
by Larrin
Tue Jan 26, 2021 8:05 am
Forum: Spyderco General Discussion
Topic: What are Matrix steels? YXR7, CPM-1V, Caldie, and More
Replies: 13
Views: 597

Re: What are Matrix steels? YXR7, CPM-1V, Caldie, and More

HAP10 is like HAP40 but without cobalt. Removing the cobalt improves toughness at the cost of a little potential hardness. For "cold work" applications like a knife the cobalt-free version is generally better because of the enhanced toughness for a given hardness. The steel is also sold as PM M3:2, ...
by Larrin
Mon Jan 25, 2021 1:57 pm
Forum: Spyderco General Discussion
Topic: What are Matrix steels? YXR7, CPM-1V, Caldie, and More
Replies: 13
Views: 597

Re: What are Matrix steels? YXR7, CPM-1V, Caldie, and More

Cool article - I learned a lot. If someone did come up with a 2% vanadium semi-matrix PM steel that solved the heat treatment issue you mentioned with ASP2012, what would the application be? Endmills, drills, or lathe tools used in high-impact machining scenarios? I'm thinking something designed fo...
by Larrin
Mon Jan 25, 2021 12:51 pm
Forum: Spyderco General Discussion
Topic: What are Matrix steels? YXR7, CPM-1V, Caldie, and More
Replies: 13
Views: 597

What are Matrix steels? YXR7, CPM-1V, Caldie, and More

Matrix steels were first invented in the 1960s and then kind of forgotten. But they continue to have an effect on knife steels today. What are they? How were they invented? Which knife steels can be called “matrix steels”? https://knifesteelnerds.com/2021/01/25/matrix-steels-yxr7-cpm-1v-caldie-and-m...
by Larrin
Sun Jan 24, 2021 1:33 pm
Forum: Spyderco General Discussion
Topic: I Tested the Edge Retention of 48 Steels
Replies: 205
Views: 16801

Re: I Tested the Edge Retention of 48 Steels

Super excited to see Larrin's new steel! Reading the email updates about it, it sounds extremely promising. I can't wait to hear the CATRA results. I have a feeling it'll do very well. Thanks once again to Shawn for doing all that heat treating and grinding! :eek: Seriously, you two are on the fore...
by Larrin
Sun Jan 24, 2021 12:51 pm
Forum: Spyderco General Discussion
Topic: I Tested the Edge Retention of 48 Steels
Replies: 205
Views: 16801

Re: I Tested the Edge Retention of 48 Steels

I can't get any 8Cr13MoV. If someone sends me some then I can consider testing it. I have only tested one serrated knife and that was one in VG-10. It never dulled over the course of the test (even with the longer test for serrated blades). So I lost interest in testing serrated blades. Just waste a...
by Larrin
Sun Jan 24, 2021 12:20 pm
Forum: Spyderco General Discussion
Topic: I Tested the Edge Retention of 48 Steels
Replies: 205
Views: 16801

Re: I Tested the Edge Retention of 48 Steels

I would love to see some of the budget steels like 8Cr, 9Cr, maybe a Chinese D2, 420HC, BD1(I know BD1N was done already) and H1 thrown into this. I know getting the stock could be the trick for a few of these, but maybe Sal could assist? Some of those steels are often regarded as being low end and...
by Larrin
Sun Jan 24, 2021 11:48 am
Forum: Spyderco General Discussion
Topic: I Tested the Edge Retention of 48 Steels
Replies: 205
Views: 16801

Re: I Tested the Edge Retention of 48 Steels

Definitely won't be called LT1, but Phil can call it whatever he wants.
by Larrin
Sun Jan 24, 2021 4:41 am
Forum: Spyderco General Discussion
Topic: I Tested the Edge Retention of 48 Steels
Replies: 205
Views: 16801

Re: I Tested the Edge Retention of 48 Steels

sal wrote:
Sat Jan 23, 2021 11:59 pm
SSSssssoooooo..............Larrin,

From whom do we order this steel?

sal
Niagara Specialty Metals
by Larrin
Sun Jan 17, 2021 1:20 pm
Forum: Spyderco General Discussion
Topic: CPM SPY27 | Edge Performance
Replies: 76
Views: 10512

Re: CPM SPY27 | Edge Performance

SPY27 and CPM-154 have roughly the same toughness. I did a whole range of CPM-154 toughness experiments and none of them matched that original value so I threw it out. I don't know what happened with it. https://knifesteelnerds.com/2020/03/16/ ... periments/
by Larrin
Thu Jan 14, 2021 1:20 pm
Forum: Spyderco General Discussion
Topic: What is the purpose of S45VN, cf S30V?
Replies: 33
Views: 1421

Re: What is the purpose of S45VN, cf S30V?

Dr Larrin also did a ton of micrographs, there are very labor intensive to make so they deserve lots of love. Thanks for posting these comparatives. I want to go on record that I DO LOVE Dr. Thomas' micrographs, but I was unaware they were difficult to obtain. I'd be interested to know how one take...
by Larrin
Mon Jan 04, 2021 2:14 pm
Forum: Spyderco General Discussion
Topic: Mr. AT Barr passes
Replies: 16
Views: 712

Re: Mr. AT Barr passes

What?!? Very sad to hear. I have one of his custom knives.
by Larrin
Sun Jan 03, 2021 5:55 am
Forum: Spyderco General Discussion
Topic: Are you comfortable with VG-10 at 15dps?
Replies: 28
Views: 789

Re: Are you comfortable with VG-10 at 15dps?

I'd be comfortable with VG-10 at 15 dps because it seems like the issues with apex folding are based on a specific laboratory test and not what the blade does when cutting a given material out in the real world. Definitely not. If you can't get any chipping or rolling with 7.5 dps then it's not act...
by Larrin
Sat Jan 02, 2021 11:49 am
Forum: Spyderco General Discussion
Topic: Powdered VG10?
Replies: 17
Views: 1773

Re: Powdered VG10?

Do you think a PM version of vg-10 would be worthwhile in terms of performance? Maybe. It depends on what you are looking for. It's much cheaper to buy a steel that already exists like CPM-154 and it's questionable if there would be any real performance advantages over that steel. It's possible the...

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