CPM S90v *Surface Ground Bar Stock HRA .156" Thickness - See Length Note
- Great steelCPM s90v is the best blade steel I have found and I'm a master tool and die maker. It's a little pricey you can make a good knife out of less expensive steel and the average user wouldn't know the difference. Having said that for toughness and edge retention 440C A2 or D2 fall way short. It is so abrasion resistant that it's almost impossible to sharpen with a stone you will need diamond or a belt sander to get an edge. Very hard to work after heat treating but machines easily in it's annealed state. I will use nothing but s90v for every blade I make from now on because I only make knives for family and friends and they deserve the best.
We buy this in 36" lengths and sell it in 12", 24" and 36"lengths.
If you buy 1ea, you will get a stick 12" long by the width and thickness shown.
If you buy 2, you will get a bar that is 24" in legnth.
If you buy 3, you will get a bar that is 36" in legnth.
**If you buy 2 or 3 and want 12" length pieces, please specify in the comments section that you would like them cut into 12" pieces.
**Advertised price is for 1qty 12" piece
Tough steel (about the same as D2) that is stainless.
Note: CPM bar stock normally comes with a very hard black exterior from the foundry. This bar stock has been surface ground to specified thickness plus .010". This means the black foundry scale has been ground off the steel leaving a raw steel finish. It is not precision ground but the thickness is going to be fairly close to the specified thickness.
CRUCIBLE CPM S90V®
(CPM 420V®) Issue #1
CPM S90V is a unique tool steel made by the Crucible Particle Metallurgy process. It is a martensitic stainless steel with a high volume of vanadium carbides for exceptionally
good wear resistance. S90V offers substantial improvements in wear resistance over 440C and D2, and other high chromium tool steels, with corrosion resistance equal to or better than 440C. Its high vanadium content favors the formation of hard vanadium carbides instead of chromium carbides for wear resistance, leaving sufficient chromium in the matrix to provide good corrosion resistance.
The wear and corrosion resistance of S90V make it an excellent candidate to replace 440C, where increased wear is a primary concern. It can replace D2 or other tool steels in applications where improved corrosion resistance is also of benefit.
Heat to 1650° F (900°C), hold 2 hours, slow cool at a maximum rate of 25° F (15°C) per hour to 1100° F (595C°), then furnace cool or cool in still air to room temperature
Annealed Hardness: Approx. BHN 277
Annealed Parts: Heat to 1100-1300°F (595-705°C), hold 2 hours, then furnace cool or cool in still air.
Hardened Parts: Heat to 25-50° F (15-30°C) below original
tempering temperature, hold 2 hours, then furnace cool or cool
in still air.
Austenitize: 2100-2150°F (1150-1175°C)
Hold time at temperature: 20 minutes
Quench: Salt quench, interrupted oil quench, positive pressure gas quench or air cool at a minimum cooling rate of 150°F/min (80°C/min) to below 1000°F (540°C). Cool to below 125°F (50° C) before tempering. For optimum vacuum heat treatment response, a minimum 4 bar gas quench is recommended.
Temper: Double temper at 400-750° F (200-400°C). Hold for a miniumum of 2 hrs. each temper. For optimum stress relieving and dimensional stability, S90V may be double tempered at 1000-1025° F (540-550°C), but tempering above 800°F (425°C)
may result in some loss of corrosion resistance.
A freezing treatment may be employed between the first and second tempers,
if desired. Freezing treatments should always be followed by at least one temper.
PLEASE NOTE: Tempering between about 800 and 1000°F (425 and 540°C) is not recommended. All martensitic stainless steels suffer from embrittlement when tempered in this range.
CRA means cold rolled annealed and is important to be in the description. It means the steel was pressure rolled while cold but was annealed again to relief the stress and take it to the softest state from rolling under tremendous pressure.
HR means hot rolled and this steel was rolled to thickness usually during the smelting process but maybe later. The steel generally will be half or nearly fully hard depending on the type. It may often have mill scale residue. This steel can be easily forged. It can also be ground via stock removal. Drilling a hole in the tang maybe hard to do with out a carbide bit.
HRA is the same but the steel was later annealed to relieve stress and make it as soft as possible for easier machining.
Several companies produce "powder" smelted steels. This is a premium smelting process that improves the mixing of alloy content and generally produces a finer grain structure as a result. The powder steels are nearly always annealed and can be assumed to annealed unless noted otherwise.
Note: CPM S90V is registered trademark of Crucible Industries LLC.