Steel Question

[Razor]

Mr. Harsey, are you at all familiar with CTV2 steel, as described in this over-the-top ad?

...are made from a proprietary hybrid alloy of Chromium, Cobalt, Tungsten, Vanadium, and Molyb-denum with surgical grade stainless steel! CTV2 offers both strength and edge holding ability that is unrivaled! Zone selective cryogenic hardening allows for medical grade edge sharpness while avoiding the brittleness of high Rockwell hardness!

Ignoring the company and any associated impressions, is CTV2 just some goofy, home-baked steel mix, or is it something to watch?

[Bill Harsey]

I have never before heard of this steel designation. I've also NEVER heard of zone selective cryogenic treatment. There would be NO value in doing zone cryo because that step also aids ultimate tensile strength of any tool steel which would benefit from cryogenic treatment. Cryogenic (deep freeze treat) must be done in proper sequence during the hardening and tempering of what ever steel your working with to do any good. Many times some steels may benefit from cryogenic treatment because they have undergone an incomplete heat treat. Yes I've seen the ads, they had a huge booth at Blade Show in Atlanta just a couple weeks ago but no knives on display.

[Sacamuelas]

Originally posted by Bill Harsey
I have never before heard of this steel designation. I've also NEVER heard of zone selective cryogenic treatment. There would be NO value in doing zone cryo because that step also aids ultimate tensile strength of any tool steel which would benefit from cryogenic treatment. Cryogenic (deep freeze treat) must be done in proper sequence during the hardening and tempering of what ever steel your working with to do any good. Many times some steels may benefit from cryogenic treatment because they have undergone an incomplete heat treat. Yes I've seen the ads, they had a huge booth at Blade Show in Atlanta just a couple weeks ago but no knives on display.

Translated into dumb tooth grinder language....

"Save your money and buy a Harsey in CPM S-30V" ..yep got it sir.

[Ambush Master]

Interesting web page on the S30V:

http://www.crucibleservice.com/datash/S30Vvs440C3.pdf

[Air.177]

Since Someone mentioned steel, I have a question. I found references to CPM S-60V and CPM S-90V recently, and was wondering what one may use these steels for. S-30V being as great as it is, I can only guess at what these alloys' properties may be.

[Sacamuelas]

From Ambush Master's above link to the crucible steel website.....
It appears from quickly glancing at the pages that the other two forms would be very difficult to resharpen in the field. I am sure the expert in these matters will give us the complete scoop.

S-60V
http://www.crucibleservice.com/datash/dsS60v4b.pdf
Typical Applications
Long-wearing Specialty Cutlery
Industrial Knives, Slitters, and Cutters
Pelletizing Equipment
Wear Components for Food and Chemical Processing

S-90V
http://www.crucibleservice.com/datash/dsS90v7b.pdf

Plastic Injection and Extrusion Feedscrews
Non-return Valve Components
Pelletizing Equipment
Gate and Nozzle Inserts
Industrial Knives, Slitters, and Cutters
Long-wearing Specialty Cutlery
Injection Molds and Inserts
Wear Components for Food and Chemical Processing
Bearings, Bushings, Valves, Rolls
Gear Pumps

[Air.177]

Thanks