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by Larrin
Mon Oct 12, 2020 9:39 am
Forum: Spyderco General Discussion
Topic: The Future of Stainless Knife Steel Design
Replies: 19
Views: 774

The Future of Stainless Knife Steel Design

A new article about why non-stainless powder metallurgy steels are better than the stainless versions and what can be done about it. I also summarize some of the discoveries in steel design over the past 20-30 years and which of those might be applied to future stainless knife steels to make them pe...
by Larrin
Mon Oct 12, 2020 9:38 am
Forum: Spyderco General Discussion
Topic: ZDP - Wow its brittle!
Replies: 44
Views: 6128

Re: ZDP - Wow its brittle!

That is an odd location for a break to occur. I am also curious what the knife was doing when it happened.
by Larrin
Mon Oct 05, 2020 6:12 am
Forum: Spyderco General Discussion
Topic: Where's the 3V?
Replies: 164
Views: 11154

Re: Where's the 3V?

I don't understand why you'd reject 3V in a folder just because it has high toughness. Its edge retention is as high as countless other folder steels like VG10. Take it thinner and enjoy better cutting performance.
by Larrin
Tue Sep 29, 2020 11:58 am
Forum: Spyderco General Discussion
Topic: S90V and S125V – History and Properties
Replies: 18
Views: 557

Re: S90V and S125V – History and Properties

Interesting list of custom makers who used s90v What are its advantages over s110v? Is it finer grained? The S90V came first of course so it wasn’t designed as an improvement over S110V. S110V has a finer microstructure and better corrosion resistance but more carbide. S90V has a bit better toughne...
by Larrin
Mon Sep 28, 2020 12:11 pm
Forum: Spyderco General Discussion
Topic: S90V and S125V – History and Properties
Replies: 18
Views: 557

Re: S90V and S125V – History and Properties

curlyhairedboy wrote:
Mon Sep 28, 2020 12:09 pm
Great article as usual, Larrin! It's great that you got to speak to some of the original designers.
To learn all their secrets of steel development.
by Larrin
Mon Sep 28, 2020 10:57 am
Forum: Spyderco General Discussion
Topic: S90V and S125V – History and Properties
Replies: 18
Views: 557

Re: S90V and S125V – History and Properties

I will have to add a reference to it in the S90V article.
by Larrin
Mon Sep 28, 2020 10:36 am
Forum: Spyderco General Discussion
Topic: S90V and S125V – History and Properties
Replies: 18
Views: 557

Re: S90V and S125V – History and Properties

In the S45VN article I wrote about nitrogen promoting vanadium carbide formation as opposed to chromium carbides. https://knifesteelnerds.com/2019/11/01/ ... 5vn-steel/
by Larrin
Mon Sep 28, 2020 8:18 am
Forum: Spyderco General Discussion
Topic: S90V and S125V – History and Properties
Replies: 18
Views: 557

Re: S90V and S125V – History and Properties

Thanks for sharing Larrin! Do you think the nitrogen addition to s90 should be revisited again(s90vn)? Would that make it easier to grind/work with, and therefore make it a more attractive option to more production companies? Given that the nitrogen version had better wear resistance, at least in t...
by Larrin
Mon Sep 28, 2020 8:16 am
Forum: Spyderco General Discussion
Topic: S90V and S125V – History and Properties
Replies: 18
Views: 557

Re: S90V and S125V – History and Properties

blues wrote:
Mon Sep 28, 2020 8:14 am
Good stuff, Larrin.

I had a custom Model 4 built for me by my late friend, knife maker "Kit" Carson, with S90V (then 420V) in the middle to late 90's. It was my very first custom knife...and holds pride of place in my collection.
Nice knife!
by Larrin
Mon Sep 28, 2020 7:48 am
Forum: Spyderco General Discussion
Topic: S90V and S125V – History and Properties
Replies: 18
Views: 557

S90V and S125V – History and Properties

New article about S90V and S125V, including how they were developed, toughness and edge retention, and information on heat treating them. Also, the history of these steels in knives, how knifemakers perceived the steel early on, and why they aren’t mainstream knife steel choices. https://knifesteeln...
by Larrin
Mon Sep 21, 2020 6:30 am
Forum: Spyderco General Discussion
Topic: Cruwear vs. S35VN
Replies: 24
Views: 7305

Re: Cruwear vs. S35VN

I’m confused, because I thought that wear resistance was a function of hardness. You say that CruWear is tougher. You say it’s harder. (Usually hardness comes at the expense of toughness.) But you say that wear resistance of S35VN is better. I don’t get it. I really like the graphs of steel charact...
by Larrin
Sun Sep 13, 2020 5:09 pm
Forum: Spyderco General Discussion
Topic: Book on metallurgy and knifemaking by Larrin Thomas
Replies: 114
Views: 7214

Re: Book on metallurgy and knifemaking by Larrin Thomas

We stand on each others shoulders so we can see farther. Thanx much Larrin for the extra view. sal The book certainly wouldn’t have been possible without all of those before me who have made their contributions to the study of steel and knives. Always building on prior knowledge to be higher than w...
by Larrin
Fri Sep 11, 2020 1:45 pm
Forum: Spyderco General Discussion
Topic: Book on metallurgy and knifemaking by Larrin Thomas
Replies: 114
Views: 7214

Re: Book on metallurgy and knifemaking by Larrin Thomas

But once the processed sheet is sent to Spyderco, would it be true that there would be a small amount of untempered martensite formed at the surface level, from the grinding and polishing operations used to make a blade? Maybe, if they are using poor grinding and polishing operations there would be...
by Larrin
Fri Sep 11, 2020 8:51 am
Forum: Spyderco General Discussion
Topic: Book on metallurgy and knifemaking by Larrin Thomas
Replies: 114
Views: 7214

Re: Book on metallurgy and knifemaking by Larrin Thomas

Yes, H1 is an austenitic steel - I can’t think of any other examples of non martensitic steels used in knife blades. I think Cliff Stamp did some experiments on sharpening and using an austenitic grade, some years ago, if I remember right. It is true that H1 is an austenitic stainless. However, it ...
by Larrin
Wed Sep 09, 2020 11:29 am
Forum: Spyderco General Discussion
Topic: Book on metallurgy and knifemaking by Larrin Thomas
Replies: 114
Views: 7214

Re: Book on metallurgy and knifemaking by Larrin Thomas

The high hardness which Crucible’s testing reported at the edge for serrated edge H1, would seem like some sort of anomaly, from your explanation. Do you think this warrants any further investigation? Not particularly. The original claim of higher hardness at the edge didn't make much sense and an ...
by Larrin
Wed Sep 09, 2020 8:29 am
Forum: Spyderco General Discussion
Topic: Book on metallurgy and knifemaking by Larrin Thomas
Replies: 114
Views: 7214

Re: Book on metallurgy and knifemaking by Larrin Thomas

I think I have said enough about H1 for now. Most of the questions being asked about H1 I already answered. Maybe people didn't like the answers. https://knifesteelnerds.com/2019/06/24/ ... -it-works/
by Larrin
Wed Sep 09, 2020 8:27 am
Forum: Spyderco General Discussion
Topic: Stable edge steels (NOT TOUGHNESS)
Replies: 34
Views: 1079

Re: Stable edge steels (NOT TOUGHNESS)

Resistance to deformation is measured by hardness (not controlled by steel but by heat treatment). Resistance to chipping is measured by toughness. So asking which is the most stable but without toughness doesn't make any sense. An edge which loses cutting ability to either chipping or rolling is st...
by Larrin
Sat Sep 05, 2020 12:41 pm
Forum: Spyderco General Discussion
Topic: Book on metallurgy and knifemaking by Larrin Thomas
Replies: 114
Views: 7214

Re: Book on metallurgy and knifemaking by Larrin Thomas

It took a while to get it and take a quick look but Larrin's book is now on the shelf right next to "Tool Steels" which was pretty much the reference most makers interested in heat treating their own blades. It is also now a text book for students and practicing metallurgists. Larrin's book is of c...
by Larrin
Wed Sep 02, 2020 5:50 am
Forum: Spyderco General Discussion
Topic: VG-10 or S30V first knife steel?
Replies: 22
Views: 634

Re: VG-10 or S30V first knife steel?

Sorry if I got all that wrong. I'm just going on what I was told. It was a representative of Crucible that were at the BLADE Show back in 2005 I believe it was that told me that 440V (S60V) was made for the tool & die market. Not sure why the guy would lie to me :confused: But at the same time I re...
by Larrin
Tue Sep 01, 2020 6:32 pm
Forum: Spyderco General Discussion
Topic: VG-10 or S30V first knife steel?
Replies: 22
Views: 634

Re: VG-10 or S30V first knife steel?

I agree with this logic as well Larrin, however I think that many of those tool steels are developed for industrial sheer types of blades where the cutting apex is a much larger bevel that the 30 to 40 degree angles we see with pocketable edge tools. Thus steels where edge stability is higher of a ...

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