Introduction

If you’re someone who is an avid hunter or an outdoorsman who likes to venture out into the hard and unfriendly terrains and encounter a situation where you might need a knife or tool with sharp edges, the CPM S35VN steel might interest you!

To be able to understand the utility of this steel as a knife, let’s walk through various factors which will help us make our decisions, such as: 

• Hardness
• Toughness
• Wear Resistance
• Corrosion Resistance
• Edge Retention
• Ease Of Sharpening

The CPM S35VN is a high-end martensitic stainless steel made by Crucible; this steel consists of high Carbon, Chromium, and Vanadium and has been carefully designed and customized to provide a great balance between toughness, corrosion resistance, and hardness. It also provides improved and better toughness over CPM S30V.

This steel is mostly used in long-wearing and durable specialty cutlery, extrusion feed screws, plastic injections, pelletizing equipment, knife industry, and wear components for Food and Chemical processing.

Composition of S35VN steel

• 14% of Chromium: For tensile strength and edge retention, and improves corrosion resistance and wear resistance.

• 0.03% of Phosphorus: which increases strength.

• 0.4% Tungsten: which improves wear resistance and hardness.

• 1.4% of Carbon: It improves hardness and wear/corrosion resistance, but a high amount decreases strength.

• 2% of Molybdenum: which increases Machinability and strength.

• 0.1% to 0.4% Nickel: which improves toughness.

• 3% of Vanadium: which improves wear resistance and hardenability.

• 0.5% Silicon: which improves Strength.

• 0.03% of Sulfur: which increases machinability.

• 0 to 0.5% Cobalt: which boosts the individual effects of other components.

• 0.5% of Manganese: which increases hardness and brittleness.

• 0.5% Niobium: which increases hardness, wear resistance, and corrosion resistance.

By taking a single look at the list, you can see that the chemical composition of S35VN steel is a combination of high Carbon, Vanadium, Chromium, and Molybdenum, which provides the steel with corrosion resistance, excellent wear resistance, and toughness.

Hardening Response

After treating a variety of S35VN steel samples using a 30 minute austenitize for 1925 and 1950 F, and 15 minutes for higher temperatures. After this, the samples were plate quenched, subjected to a cryo treatment with liquid nitrogen, and once again, tempered twice for the duration of 2 hours. 

The heat treatment tests resulted in similar hardness to the datasheet as shown below:

From the above graphs, we can deduce that S35VN has good potential hardness and it is capable of reaching a minimum of 64 Rc. This should ideally provide a good range of hardness values to knifemakers.

Corrosion Resistance

Corrosion resistance refers to a steel’s capability to resist and prevent corrosion such as rusting which is caused by external factors namely humidity, salt, and moisture. It is crucial that we keep in mind that higher resistance to corrosion comes at the expense of the overall edge performance of that particular steel.

A corrosion resistance test performed on S35VN and S45VN revealed that S35VN did fairly well in the corrosion testing, almost as well as S45VN which was specifically designed to have better corrosion resistance with an increased Chromium content. Below is a table showing ratings of S35Vn vs. Elmax vs. S45VN vs. M390 vs. Vanax.

Steel	Corrosion Resistance Rating
S35VN	7.8
Elmax	7.8
S45VN	8.4
M390	9.1
Vanax	10

Wear Resistance

S35VN steel has been noted to deliver good quality wear resistance, despite its high levels of toughness. In this steel, Niobium combined with Carbon forms Niobium Carbides that facilitate in making S35VN more effective at offering quality wear resistance. The high level of Vanadium also contributes to and facilitates the steel’s great wear resistance.

Also, Molybdenum binds with Carbon to form hard Carbides that make the steel harder which subsequently improves its wear resistance. Overall, S35VN offers excellent abrasion resistance which will last for years without deforming at the first sign of tear, as cheap steel grades do.

Ease of Sharpening

The ease of sharpening or sharpening ability is correlated with the hardness of the steel. Taking into account that the S35Vn is not ultra-hard, sharpening it with ease will not be too much of a challenge. But this does not mean that it is the easiest steel to sharpen and will present challenges to a certain extent.

It would be helpful for you to know that you can give your S35VN steel knife a razor-sharp edge with somewhat ease and with lesser effort as compared to harder steel grades.

Machinability

Not a high number of high-end martensitic stainless steels are everyone’s favorite to work with, but the S35VN will give you a rather smooth time while working on it. Most knife smiths love the S35VN steel since it is easy to machine, grind, and even polish. 

This steel requires little power to cut and remains the top contender for bladesmiths who wish to create high-quality blades without wearing out the steel with heavy machining.

S35VN Heat Treatment

After reading the graphs and comprehending them, it would be recommended to treat S35VN by austenitizing for 15 minutes at 2025 F, plate quenching, followed by a liquid nitrogen treatment for at least 30-35 minutes, and then tempering between 300 and 400 F twice for a duration of 2 hours each time.

This heat treatment should result in at least a 60 Rc accompanied by good toughness, corrosion resistance, fine microstructure, and toughness.

S35VN Pros and Cons

Pro #1 – Improved Toughness

A pocket knife’s toughness depends on its ability to resist cracks, chips, and other damage caused by impact. This sort of damage is extremely tiring to fix and can lead to permanent indentions or damage to the blade.

The CPM methodology produces steel that is generally tougher and more resistant than other steel grades. When compared to CPM S30V, the Niobium Carbides in CPM S35VN stainless steel make the steel approximately 15-20% tougher, resulting in the blade becoming more resistant to chipping and cracking.

Pro #2 – Improved machinability 

CPM S35VN is usually preferred by craftsmen and bladesmiths since it is easier to machine, grind, and even polish. The machinability in metal is measured and calculated by the ease with which it can be cut and still be able to retain a good finish. S35VN steel usually requires little to minimal power to cut, making it a top contender for craftsmen.

Pro #3 – Ability to withstand prolonged use

CPM S35VN knives can stand up to long-term usage without diminishing or tampering with quality. S35VN steel generally has a Rockwell Hardness rating ranging between 58 and 61, depending on the heat treatment of the blade. The Rockwell scale measures a metal’s hardness by measuring and calculating how deep an indenter can penetrate a metal under a really heavy load.

Super hard steel (like the ones used in chisels) has an HRC rating ranging between 55-66. For example, axes generally have a rating ranging between 45 and 55.

CPM S35VN steel’s high HRC rating facilitates it in becoming highly durable steel for everyday usage in harsh conditions. For most pocket knife users, everyday utility is a huge parameter that needs to be fulfilled.

Con #1 – Costlier than other steels

CPM S35VN steel is considered to be moderately higher quality steel than its most counterparts, hence it does not seem unusual to realize it has a higher price to it as well. The most common stainless steel in the ‘mid-range category can cost nearly 3 to 4 times less than a CPM alloy steel.

After adding in the additional costs that come with machining, grinding, and heat treating higher quality steels, the end product usually tends to be on the higher end of the cost spectrum.

CPM S35VN pocket knives usually range anywhere from $100 to $300, whereas, on the other hand, a mid-range pocket knife is generally under $100.

Con #2 – Requires slightly more effort to sharpen

CPM S35VN steel’s most significant advantage is that it can be sharpened to exceptional levels. This makes this pocket knife blade ideal for outdoorsmen and regular hunters who require the use of sharp, tough, and wear & tear resistant blades. 

Manufacturers of pocket knives made from CPM S35VN steel knives often agree that such highly durable and tough steel can be difficult to sharpen. Such a hard and tough material requires special sharpening skills and stones.

Pro #3 – Minor differences between S35VN and S30V steel

When the S30V steel was first launched back in 2001, the community was impressed with its high quality and comparatively low price range. Such factors made it an easy choice for the everyday pocket knife user.

S35VN was launched in 2009 with slight improvements to the S30V formula. Its chemical composition made it a tougher and more wear-resistant steel, but some feel that the enhancements are too minor to justify the hiked-up price.

Steel Comparisons

S90V vs. S35VN

Parameters	S90V	S35VN
Toughness	2/10	6/10
Ease of Sharpness	3/10	6/10
Corrosion Resistance	6/10	7/10
Edge Retention	8/10	6/10

From studying the above table, it is fair to deduce that S35VN provides improved toughness, ease of sharpness, and corrosion resistance as compared to S90V steel.

S35VN vs. M390

Parameters	S35VN	M390
Toughness	6/10	6/10
Ease of Sharpness	6/10	5/10
Corrosion Resistance	7/10	8/10
Edge Retention	6/10	8/10

From studying the above table, it is fair to deduce that S35VN provides improved ease of sharpness but cannot be at par with the M390 steel in terms of edge retention and corrosion resistance. They are equally tough.

S35VN vs. Elmax

Parameters	S35VN	Elmax
Toughness	6/10	6/10
Ease of Sharpness	6/10	4/10
Corrosion Resistance	7/10	5/10
Edge Retention	6/10	9/10

From studying the above table, it is fair to say that S35VN provides improved ease of sharpness and corrosion resistance as compared to the Elmax steel. Elmax scores higher in edge retention. They are both equally tough steels.

S35VN vs. 3V

Parameters	S35VN	3V
Toughness	6/10	10/10
Ease of Sharpness	6/10	5/10
Corrosion Resistance	7/10	5/10
Edge Retention	6/10	7/10

From studying the above table, it is fair to say that the CPM S35VN provides improved corrosion resistance and ease of sharpness as compared to the CPM 3V. The 3V steel provides improved edge retention and toughness as compared to S35VN.

S35VN vs. D2

Parameters	S35VN	D2
Toughness	6/10	6/10
Ease of Sharpness	6/10	3/10
Corrosion Resistance	7/10	4/10
Edge Retention	6/10	7/10

From studying the above table, it is fair to say that S35VN provides improved ease of sharpness and corrosion resistance as compared to the D2 steel. D2 steel provides improved edge retention as compared to the S35VN and both are equally tough.

Recommendation of best S35VN knife

Spyderco, Bark River, Kizer Cutlery, and Zero Tolerance are amongst many top manufacturers who have utilized the S35VN steel for their premium blades. The versatile Bark River Bravo 1 is widely recognized as one of the nest survival/bushcraft knives in the market as of now, and the Bravo 1 knife is a top contender in almost every category. 

The bravo 1 was created after several members of the Marine Corps Force Recon bought several knives from multiple manufacturers and tested them in harsh conditions. The big, fat winner was the Bark River Gamekeeper. After receiving a few feedback ideas from the Marine Corps, Bark River created the Bravo 1. 

This particular knife has a 4.25 inches drop point blade, a convex ground, with a satin-like smooth finish. The S35VN steel blade is .22 inches thick and features a ramp-up thumb rest.

Conclusion

To conclude, S35VN is a great knife for the trained outdoorsmen and hunter who ventures into slightly harsh terrains. It is a high-end premium steel blade and provides a decent amount of toughness, ease of sharpness, edge retention, and corrosion resistance. It can easily withstand daily wear and tear for a long period of time

It falls in the higher end of the cost spectrum but most people can argue that it worth the buy due to its durability and composition. From the above-presented comparison tables, you can decide which steel suits your needs best.

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