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by Larrin
Mon Sep 21, 2020 6:30 am
Forum: Spyderco General Discussion
Topic: Cruwear vs. S35VN
Replies: 24
Views: 6427

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: 96
Views: 5634

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: 96
Views: 5634

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: 96
Views: 5634

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: 96
Views: 5634

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: 96
Views: 5634

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: 867

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: 96
Views: 5634

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: 555

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: 555

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 ...
by Larrin
Tue Sep 01, 2020 12:30 pm
Forum: Spyderco General Discussion
Topic: VG-10 or S30V first knife steel?
Replies: 22
Views: 555

Re: VG-10 or S30V first knife steel?

It's always been amazing to me that certain types of steel that were made for certain applications. Take ATS-34 for instance>> I heard that it was first made for turbine blades in jet engines> and it was an American knife maker that discovered it to be a great blade steel with the right heat treatm...
by Larrin
Tue Sep 01, 2020 11:39 am
Forum: Spyderco General Discussion
Topic: VG-10 or S30V first knife steel?
Replies: 22
Views: 555

Re: VG-10 or S30V first knife steel?

Takefu does claim that VG10 was developed for knives: http://www.e-tokko.com/v_gold_10.php?lang=en
by Larrin
Thu Aug 27, 2020 10:13 am
Forum: Spyderco General Discussion
Topic: Rex45=Hap40?
Replies: 26
Views: 605

Re: Rex45=Hap40?

That's interesting. Is there an industry standard maximum allowance for sulfur content? Not really. Not unless there is a European spec I don’t know about. There may be specific industries like aerospace with more rigorous restrictions but for knife steel they are just making the steel with their n...
by Larrin
Thu Aug 27, 2020 10:08 am
Forum: Spyderco General Discussion
Topic: Rex45=Hap40?
Replies: 26
Views: 605

Re: Rex45=Hap40?

Mn and Si is in every knife steel so if they aren't listed it's just because the amounts aren't shown in the datasheet. Sulfur is usually not an intentional addition but an impurity, so some datasheets will list a maximum allowable amount. Thanks! So would you say the primary difference between REX...
by Larrin
Thu Aug 27, 2020 8:09 am
Forum: Spyderco General Discussion
Topic: Rex45=Hap40?
Replies: 26
Views: 605

Re: Rex45=Hap40?

According to Spyderco’s steel comparison chart ( https://www.spyderco.com/edge-u-cation/steel-chart/ ), they do seem to have very similar chemistry in terms of carbon, chromium, cobalt, molybdenum, tungsten, and vanadium. REX45 seems to have manganese, silicon, and sulfur, which are not included in...
by Larrin
Sat Aug 22, 2020 11:32 am
Forum: Spyderco General Discussion
Topic: Where does SPY27 Steel sits among the current Steel lines?
Replies: 33
Views: 1182

Re: Where does SPY27 Steel sits among the current Steel lines?

Understood. With a CATRA machine, is there a way to conclude the test at a higher degree of sharpness so the "front end" can be isolated and measured? However... with the Sillica present in the card stock, there may not be a point in doing that, as I suspect that the stack rank would be approximate...
by Larrin
Sat Aug 22, 2020 6:30 am
Forum: Spyderco General Discussion
Topic: Where does SPY27 Steel sits among the current Steel lines?
Replies: 33
Views: 1182

Re: Where does SPY27 Steel sits among the current Steel lines?

SubMicron wrote:
Fri Aug 21, 2020 6:55 pm
What CATRA does not measure is the front end edge retention, especially through non abrasive materials, such as clean cardboard, cloth, tape, plastic, etc.
The CATRA test generates a full sharpness loss curve. It tests every stage including “front end.”
by Larrin
Tue Aug 18, 2020 8:53 am
Forum: Spyderco General Discussion
Topic: CPM-S60V – The Forgotten Super Steel
Replies: 15
Views: 910

Re: CPM-S60V – The Forgotten Super Steel

We will get something with true differentiation in performance eventually, I hope.
by Larrin
Mon Aug 17, 2020 7:32 pm
Forum: Spyderco General Discussion
Topic: CPM-S60V – The Forgotten Super Steel
Replies: 15
Views: 910

Re: CPM-S60V – The Forgotten Super Steel

Hi Larrin, et all Another reason CPM S60 sort of faded out was the introduction of CPM S90V which was touted as an upgrade to S60V. S90V had everything S60V did plus after some fine tuning had better heat treat response. Yes , more resistance to finish but also somewhat better edge holding as noted...
by Larrin
Mon Aug 17, 2020 7:30 pm
Forum: Spyderco General Discussion
Topic: CPM-S60V – The Forgotten Super Steel
Replies: 15
Views: 910

Re: CPM-S60V – The Forgotten Super Steel

Cambertree wrote:
Mon Aug 17, 2020 6:28 pm
Thanks Larrin, I particularly enjoyed this article. :)
Awesome!

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