Spyderco Forums

Well done Larrin. Several of the steels you used for this study are capable of being heat treated to bainitic structures. I recommend inclusion of that information in the next chapter. It has been more difficult than expected to get austempered/bainitic heat treatments performed on steel. A now-dec...

Summary of toughness measurements on a range of low alloy steels like 52100 and Blue Super. Then an explanation of what factors control the toughness of low alloy steels. And information on how heat treatment affects the toughness of these steels. https://knifesteelnerds.com/2020/02/17/ranking-tough...

I have no idea to be honest. N690Co and N690 are the same, and a lot more companies are marking them as N690 or N690Co.......I have no explanation why. Maybe the variant with Co sounds cooler? Like why name your steel Vanadis 4E, when you can name it Vanadis 4 Extra (!!!!! +20 % moar cool!) Urban i...

Larrin, just to let you know that we are waiting for article update :D Ok I will get on it right away. Hello Larrin, Did you receive the steel for testing by any chance? Just excited to see your results. As I always write in signature of my emails - hope to hear from you soon :D I heard today that ...

Woodpuppy wrote: ↑

Mon Feb 03, 2020 10:29 am

Would there be other suitable stainless cladding steels To better match HAP40?

Possibly. It might be tough to find something that fits all of their desired properties (cheap, easy to roll, provides a toughness and grindability improvement, etc.).

From what I understand, some steels pair well with certain stainless steels, and can be heat treated for optimal performance. Are there some steels that don't pair well with stainless steels, making it difficult to heat treat? Not that I'm saying this is the issue with Spyderco's Hap40. This topic ...

GarageBoy wrote: ↑

Sat Feb 01, 2020 6:52 pm

What happens to the outer layer when the temperature is too high?

Grain growth leading to toughness reduction.

When laminated steel is heat treated they need to account for both steels. The outer SS requires a different heat treatment to a plain slab of HAP40. Many laminated steels are heat treated sub-optimally. The stainless hardening temperatures are too high for the low alloy steels (like stainless over...

The properties are identical. It’s the same steel. Perhaps I'm missing something, but I was very much under the impression that while Rex45 & Hap40 were quite similar, their actual make-up was slightly different, and I thought the heat-treat typically done to them was rather different. I will s...

The properties are identical. It’s the same steel.

avocadobbq wrote: ↑

Tue Jan 21, 2020 12:08 am

Does anyone know of any powdered metallurgy or spray formed steels similar to Super Blue? I love Super Blue but I think the finer grain structure is also neat.

The carbide structure of blue super is probably pretty fine. Powder metallurgy wouldn't affect it much.

I wonder if this will sort of feel like a stainless cruwear. Sharpens up to a nice razor edge easily. Maintains that high level of sharpness a little better than high vanadium steels like s110v and even s30v and it could address the constant complaints of burnt chippy edges from the factory with th...

pantagana23 wrote: ↑

Fri Jan 17, 2020 2:34 am

Larrin, just to let you know that we are waiting for article update :D

Ok I will get on it right away.

sal wrote: ↑

Thu Jan 16, 2020 2:48 pm

Hi Larrin,

Bob will send a sample to you.

sal

Great!

Chris_P_Bacon wrote: ↑

Wed Jan 15, 2020 8:39 pm

You hear the term "sharpener's steel" tossed around, some folks in that camp also want stainless.

SPY27 is the new "Stainless sharpener's steel". Props to Spyderco for making it happen.

Anyone know which foundry it's out of?

Crucible

I gave my analysis of the new steel here: https://knifesteelnerds.com/2020/01/15/spyderco-exclusive-cpm-spy27-steel-analysis/ Well that was fast! :) Thanks for the detailed preliminary breakdown of the steel Larrin. This has to be the fastest I've ever written an article. There are probably a zilli...

I gave my analysis of the new steel here: https://knifesteelnerds.com/2020/01/15/ ... -analysis/

Larrin, the following was somewhat already discussed in the "LC 200" thread, may I ask for your opinion on it?: There are those who say that if S35VN is an "upgrade" over S30V at all, than mostly for knife makers (cause it is easier to work with) than for knife users . I am a to...

Hello Larrin. You brought up CPM 154 and M390 as "both have higher than expected toughness". One steel that rates pretty high on your chart is 19C27. I keep on wondering why it would be rated as highly as it is. Is it because the chrome is only 13% ? It is a 1% carbon steel like others ra...

Great read as usual Larrin! I have to ask though...I’ve read most of your articles and have never come across you stating that you prefer/like any one particular steel over another. Do you have a favorite in stainless and non-stainless steels? I’m assuming you have to remain neutral like parents do...