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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 ...

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...

Takefu does claim that VG10 was developed for knives: http://www.e-tokko.com/v_gold_10.php?lang=en

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...

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...

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...

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...

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.”

We will get something with true differentiation in performance eventually, I hope.

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...

Cambertree wrote: ↑

Mon Aug 17, 2020 6:28 pm

Thanks Larrin, I particularly enjoyed this article.

Awesome!

Yes I saw that post from Sal. Thanks for sharing it here.

New article about a steel not often discussed – CPM-S60V. The steel never seemed to take off and now is more or less forgotten. I covered the steel’s development and use in knives including why it didn’t succeed. Then tests of its toughness and edge retention and whether I think it should make a com...

Awesome to learn more about 10V, and by extention the whole "V family." For anyone wondering, BBB measured the Rockwell hardness of spyderco's recent 10v pm2 at 64.6, so according to Larrin's dataset it should have wear resistance equal to or higher than s90v. Question for Larrin: in some of your t...

sal wrote: ↑

Mon Aug 03, 2020 12:06 pm

Hi Larrin,

Golden is hard to beat for sure. Where are you now?

sal

Pittsburgh at US Steel Research.

tbdoc4kids wrote: ↑

Mon Aug 03, 2020 12:32 pm

Interesting as always. I continue to be impressed at your ability to make this knowledge accessible.

Thanks!

A new article about the history of CPM-10V, how it was developed, how its composition works, and its use in knives. And information about how its properties compare to other knife steels and recommendations on how to heat treat it for the custom knifemaker. https://knifesteelnerds.com/2020/08/03/cpm...

sal wrote: ↑

Sun Aug 02, 2020 10:24 am

Hey Larrin.

Any knife or sharpener we make. A birthday gift. Let me know.

sal

That’s very generous, Sal. I will think about it. My wife says she would rather you give me a job in Golden.

Thanks for the birthday wishes everyone.

foofie wrote: ↑

Sat Aug 01, 2020 3:48 pm

Edit - Happy Birthday Dr. Larrin S. Thomas, Ph.D., sir.

Ha!