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Warming back up to room temperature from -320F




Surfacing to a high finish with diamond abrasive belts



Testing between cycles.

ZrowsN1s wrote: ↑

Mon Apr 15, 2024 3:11 pm

Thanks for the Master Class, Shawn. The knowledge is ALWAYS appreciated.

Thanks LQ.

I appreciate it.

Hey Shawn, What did you use for the quench? sal https://i.imgur.com/nFq31rE.jpeg Large aluminum plates with forced air to race to under 1000f to prevent proeutectoid carbide precipitation on prior austenite grain boundaries. https://i.imgur.com/dRvB3v5.jpeg Water when under~1000f to speed the cooli...

All steel chemistries have a "chemistry range" these different variations of chemistry within that tolerance that can affect what goes into solution at a given temperature which will affect the hardness even at the same temperature requiring a shift up or down in temperature to match hardn...

CPM S60V https://i.imgur.com/mttR3S8.jpeg CPM S90V https://i.imgur.com/L26ZBcM.png Bohler M390 https://i.imgur.com/lCmv7n2.png The color metallography colors the different carbide types differently, CPM S60V has a higher volume of vanadium carbides than M390... I've not seen color metallography bef...

I know the price of most PM steels in Europe and they're not cheap, especially CPM in low quantity (Bohler is closer so that's normal). I still felt like the cost was high for one knife but then I saw the size of the knife, understandable. :squinting-tongue Yes, it's funny because a lot of us start...

Shawn, Was the micrograph for S60V done on Sal’s knife, i.e. was it dome pre-heat treat? If so, I thought the heat treating process changed the microstructure. I’ve heard expression like “grain size” and “grain growth” with regards to heat treat. I certainly could do metallography on the knife but ...

Good thread! I knew that you were heavily involved in knife making, but had no idea you had all of that equipment. Do you take orders for knives at this time? I've been brought to a crawling pace with raising two beautiful children. They are currently 1 and 3 years old so things will pick up when t...

Fascinating stuff, Shawn. Thanks for the micrographs, those are really interesting to see! You pull no punches when it comes to big kitchen knives with the high carbide steels. That big 15V kitchen knife you made some time back still haunts my thoughts from time to time (in the best way). Thank you...

Shawn, Thanks for sharing, always good to see how your knives are made. What are you going to use for a handle? I have a lot more luck working with wood and have a ton of fun making handles for my mules. I have some Gabon Ebony I want to try next but running out of excuses to buy more mules. Can’t ...

When you heat treat this blade, are you using a "recipe" that is published by others? No Do you use your own recipe arrived at through your own experimentation? My own Or are you able to look at the specs, and intuitively know what you need to do? Institution doesn't work, without measure...

While the furnace is heating, it we'll be nice to share some color metallography I made of CPM S60V and what excites me about it. The microstructure is actually finer than CPM S90V and M390. https://i.imgur.com/LsYRECc.png CPM S60V https://i.imgur.com/mttR3S8.jpeg CPM S90V https://i.imgur.com/L26ZBc...

HI Shawn, Thanx much. Looking forward to it. How hard will you make it? Thanx for the kind words. sal Well, thank you for sharing the passion with all of us. As for the hardness, we'll measure the hardness on this piece when it is done. The furnaces are heating up. 309 SS foil is ready. Should be a...

Steeltoez83 wrote: ↑

Thu Apr 11, 2024 6:50 pm

I'm stoked. I know what this steel and heat treat are capable of. I believe Sal is in for a real treat when he puts it thru the paces. Looking forward to more updates as well.

Matt,

Do you want handles on your Rex 76 mule?

First step as a handmade custom knife maker is to select a pattern, I've been designing a kitchen knife pattern that has the same line flow and ergonomics of my trapper knife pattern which a enjoy considerably. https://i.imgur.com/yD3X0ca.jpeg The steel is marked with Machinist dye and the pattern i...

RugerNurse wrote: ↑

Thu Apr 11, 2024 4:37 pm

Is this a folder or a fixed blade?

I'll leave the folders to Spyderco.

When Sal was testing my folding collaboration design I remember he said it cut his sushi well.

I think Sal needs a bigger blade for his sushi.

Sal has mentioned many times the past experience with S60V/440V and the steel not being able to achieve a useable high working hardness and also being miserable to sharpen at lower hardness. It seems with CPM S60V, things have changed in recent years especially new batches of CPM S60V versus the ori...

Hi Steeltoes, Was if finished? Did you use it? sal Sal, I'll just make ya one and you can test it. Love to Shawn. Almost like a new steel, and one that I chose for our introduction of powdered metals into the production market. I'd like to pay for it or trade you something. If it works well, we mig...

Lets say the chart shows 500 Total Cards Cut for some particular steel. That is only 1.64042 feet. It looks like the stack of cards to be cut is being moved over a 1 inch area of the blade. Are they saying that that one inch of blade can only cut 1.64042 feet of card material? The area of the blade...

sal wrote: ↑

Sat Apr 06, 2024 8:41 pm

Hi Steeltoes,

Was if finished? Did you use it?

sal

Sal, I'll just make ya one and you can test it.