CPM® S35VN® Stainless Steel Data Sheet
This CPM S35VN stainless steel data sheet highlights the edge retention and toughness of this knife steel. CPM S35VN is a tougher version of the popular CPM S30V, due to the addition of niobium. With the addition of .5% niobium, niobium carbides are formed, making CPM S35VN tougher and better able to hold an edge. Machinability and polishibility are also improved.
|Wear Components for Food and Chemical Processing|
|Plastic Injection Screws|
Average Pitting Potential measurements from Polarization Curves
run in 5% NaCl (Sodium Chloride) Solution at Room Temperature:
(Higher voltage pitting potential indicates better corrosion resistance.)
Preheat: Optional preheat stage for unbalanced geometries or complex designs - Heat to 1550-1600°F (845-870°C) Equalize.
Austenize: 1900-2000°F (1035-1095°C), hold time at temperature 15-30 minutes.
Quench: Air or positive pressure quench (2 bar minimum) to
below 125°F (50°C), or salt or interrupted oil quench to about
1000°F (540°C), then air cool to below 125°F (50°C). Accelerated air quenching works well for thin sections, while minimizing warpage.
Tempering: Double temper at 400-750°F (200-400°C). Hold for 2 hours minimum each time. (See Table) A cryogenic treatment
may be used between the first and second tempers. Cryogenic treatments help to attain maximum hardenability and must
always be followed by at least one temper.
NOTE: CPM S35VN may be tempered at 1000-1025°F (540-550°C)for optimum stress relieving, . Tempering in this range
may result in a slightly lower corrosion resistance.
Cryogenic Treatments: Refrigeration treatments may improve long term dimensional stability by transforming retained austenite. Refrigeration treatments should generally be performed after the first temper, and must be followed by a temper.
Heat Treat Response
| ||Austenizing Temp.|
|at Aust. Temp.||30 min.||30 min.||15 min.|
Nitriding decreases the corrosion resistance of stainless steels and is generally not recommended for stainless steels.
Heat to 1650°F (900°C), hold 2 hours, slow cool no faster than 25°F (15°C) per hour to 1100°F (595°C), then furnace cool or cool in still air to room temperature.
Annealed Hardness: About BHN 255
Annealed Material: Heat to 1200/1250F(650/675C), hold two hours, cool in still air.
Hardened Material: Heat to 25F(15C) below original tempering temperature, hold two hours, cool in still air.
Use 440C or 420 stainless steel filler material.
Annealed Material: Preheat 600/800F(320/430C), maintain over 600F(320C) during welding. Reanneal or temper 1200/1400F(650/760C) for 4 hours after welding.
Hardened Material: Preheat to 50F(30C) below original tempering temperature (400F (205C) minimum). Maintain above 400F(205C) during welding. Cool to 150F(65C) after welding. Temper immediately 25F(15C) below original tempering temperature. Minimum 400F(205C)
|Modulus of Elasticity||30psix10(6) (200 GPa)|
|Density||0.278 lb/in3 (7640 kg/M3)|
|Thermal Conductivity||14.0 BTU/hr./ft./F 24.2 W/m/ °K)|
| ||CARTA Test Results||Transverse C-Notch|
|CPM S35VN||145%||12.0 ft. lbs.|
|CPM S30V||145%||10.0 ft. lbs.|
|154 CM||120%||2.5 ft. lbs.|
|440C||100%||2.5 ft. lbs.|
For more information about tool steels and stainless steels suitable for knifemaking see out
Knife Steel Introduction
Knife Steel Comparison Chart
CPM® and S35VN® are registered trademarks of Crucible Industries, LLC
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