Author: Michael Manrose

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Pros and Cons of CPM PSF27

Combative Edge SF7
Combative Edge SF7 Tanto Sheath
Combative Edge SF7 Tanto Sheath

CPM PSF27 is a high-alloy, powder metallurgy tool steel developed by Crucible Industries. It is known for its toughness, wear resistance, and corrosion resistance.

CPM PSF27 is recognized for its excellent toughness, making it well-suited for applications that involve heavy impact or stress. This attribute is particularly valuable in tasks where durability and resistance to chipping are important.

It exhibits good wear resistance, contributing to its ability to retain a sharp edge over extended periods of use. This makes it suitable for applications that involve abrasive materials.

CPM PSF27 contains significant amounts of chromium, which enhances its resistance to corrosion. This makes it more resistant to rust and staining compared to some other tool steels.

The PM process allows for a fine and uniform distribution of carbides in the steel matrix, resulting in improved overall performance, including enhanced wear resistance and toughness.

The combination of toughness and wear resistance contributes to edge stability, allowing the steel to maintain its cutting performance under challenging conditions.

Like many high-alloy tool steels, CPM PSF27 may be more challenging to sharpen compared to simpler steels. The high hardness and wear resistance contribute to this characteristic. Proper sharpening techniques and tools are recommended.

Knives made from CPM PSF27 tend to be more expensive due to the cost of the steel and the challenges associated with the powder metallurgy manufacturing process.

CPM PSF27 may not be as widely available as more common steels, and knives made with this steel may have limited options in the market.

It’s important to note that specific performance characteristics may vary depending on the heat treatment and knife design. Additionally, advancements in metallurgy and steel technology may lead to new developments in the properties of CPM PSF27 or other similar steels.

For the most accurate and up-to-date information on CPM PSF27 or knives using this steel, it is recommended to check with reputable knife manufacturers or suppliers who provide detailed specifications for their products.

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Pros and Cons of CPM S90V

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CPM S90V is a high-end, premium stainless steel known for its exceptional edge retention and corrosion resistance. Developed by Crucible Industries, it is part of the family of super steels and is used in the production of high-performance knives.

CPM S90V is renowned for its exceptional edge retention. It can maintain a sharp edge for an extended period, making it well-suited for tasks that demand prolonged cutting without frequent resharpening.

The steel exhibits high wear resistance, making it well-suited for applications where the blade is subjected to abrasive materials or heavy use.

CPM S90V contains a significant amount of chromium, contributing to its excellent corrosion resistance. This makes it suitable for knives used in environments where exposure to moisture is a concern.

Like other premium steels, CPM S90V has a fine grain structure. This fine grain contributes to its sharpness, allowing for precise cutting performance.

CPM S90V has a high level of hardness, which contributes to its excellent wear resistance and edge retention.

One of the main challenges with CPM S90V is its difficulty to sharpen. The steel’s high hardness and wear resistance can make it more time-consuming and challenging for some users to bring the blade to a keen edge. Specialized sharpening tools or skills may be required.

While CPM S90V is known for its hardness, it can be relatively brittle compared to some other knife steels. This means that it may be more prone to chipping or breakage, especially under heavy lateral stress or when used improperly.

Knives made with CPM S90V are typically more expensive due to the cost of the steel itself and the challenges associated with working with such high-performance materials.

CPM S90V is not as commonly used as some other steels, so knives made with this steel may have limited availability in the market.

In summary, CPM S90V is a premium steel that excels in edge retention, wear resistance, and corrosion resistance. However, its difficulty in sharpening and potential brittleness are factors to consider, and it is often recommended for users who prioritize edge retention and are experienced in maintaining and sharpening high-performance steels.

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Pros and Cons of CPM-S30V

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CPM-S30V is a high-performance stainless steel often used in the production of high-quality knives. Developed by Crucible Industries in collaboration with knife maker Chris Reeve, CPM-S30V is known for its excellent combination of edge retention, corrosion resistance, and toughness. 

CPM-S30V is highly regarded for its exceptional edge retention. This steel can maintain a sharp edge for extended periods, making it suitable for tasks that require prolonged cutting without frequent resharpening.

CPM-S30V has good corrosion resistance, thanks to its high chromium content. This makes it well-suited for knives that may be exposed to moisture and environmental elements.

While not as tough as some other steels designed specifically for impact resistance, CPM-S30V still offers a good balance of toughness and hardness. It can withstand moderate abuse without chipping or breaking.

While it is a high-hardness steel, CPM-S30V is known to be reasonably easy to sharpen compared to some other super steels. This is beneficial for users who want a balance between edge retention and ease of maintenance.

The steel’s fine grain structure contributes to its excellent performance characteristics. It allows for a sharp and precise edge, contributing to the overall cutting performance.

CPM-S30V is a popular steel choice and is used by many reputable knife manufacturers. It has gained a solid reputation in the knife community for its overall performance.

Knives made with CPM-S30V steel tend to be on the higher end of the price spectrum. The cost of the steel itself, coupled with the manufacturing processes required, contributes to the overall price of knives using this steel.

While many find CPM-S30V relatively easy to sharpen, some users, especially those new to sharpening, might find it slightly more challenging compared to softer steels.

In some applications, the high hardness of CPM-S30V may make it more prone to chipping or breakage under heavy lateral stress. It’s essential to use the knife within its intended design and not subject it to excessive abuse.

In summary, CPM-S30V is a high-quality steel with a well-balanced set of characteristics that make it suitable for a wide range of cutting tasks. Users looking for a premium steel that offers excellent edge retention and corrosion resistance often appreciate knives made with CPM-S30V.

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More About Rob Walker Designs

Combative Edge SF7
Combative Edge SF7T
Combative Edge SF7T

Rob Walker is known for his craftsmanship in creating custom knives. Each knife is typically handcrafted with attention to detail, and he offered a range of designs and styles to cater to different preferences.

Rob often use a variety of high-quality materials, including premium blade steels, handle materials (such as various types of wood, G-10, or carbon fiber), and other components. The choice of materials can impact the knife’s performance, aesthetics, and durability.

He developed a unique design philosophy that reflects their preferences and expertise. Rob Walker’s design philosophy encompassed elements such as ergonomics, functionality, and aesthetic appeal.

Rob produced limited editions or collaborate with other makers or artists to create unique and special pieces. These collaborations resulted in knives that blend the styles and techniques of multiple craftsmen.

Rob Walker’s knives featured artistic elements such as unique blade grinds, intricate handle designs, filework, or other decorative touches that set them apart.

These are some of the features on knifes that are designed by Rob Walker.

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Who Is Darrel Ralph?

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Darrel Ralph is a well-known knife designer and maker known for his innovative and high-quality knife designs. His knives often blend functionality, ergonomics, and artistic aesthetics. Darrel Ralph has been in the knife-making industry for many years and has gained a reputation for producing custom and mid-tech knives. Here are some common features and themes associated with Darrel Ralph designs:

  1. Assisted Opening Mechanisms:
    • Darrel Ralph is recognized for incorporating advanced opening mechanisms into his designs. Many of his knives feature assisted opening systems, such as the use of springs or other technologies, to facilitate quick and smooth deployment of the blade.
  2. Machining and Materials:
    • Ralph often utilizes high-quality materials and precision machining techniques in his knife designs. This may include the use of premium blade steels, titanium handles, and other exotic materials.
  3. Innovative Locking Mechanisms:
    • He has a reputation for developing and implementing innovative locking mechanisms. Some of his designs feature unique and robust locking systems that contribute to the overall strength and reliability of the knife.
  4. Ergonomics:
    • Darrel Ralph pays attention to the ergonomics of his knife designs. Many of his knives are crafted with user comfort in mind, ensuring a secure grip and ease of use.
  5. Custom and Limited Editions:
    • While Darrel Ralph produces custom knives, he also ventures into mid-tech production. This allows a broader audience to access knives inspired by his designs, although with some level of production standardization.
  6. Tactical and EDC Designs:
    • Some of his designs are geared towards tactical use, featuring features that cater to military or law enforcement preferences. Additionally, he designs knives suitable for everyday carry (EDC) with a focus on practicality and functionality.
  7. Collaborations:
    • Darrel Ralph has collaborated with various knife companies and manufacturers to bring his designs to a wider market. Collaborations often involve adapting his custom designs to production-friendly processes.
  8. Artistic Flair:
    • While functionality is a key aspect, Darrel Ralph’s designs often showcase an artistic flair. His knives may feature unique blade shapes, handle designs, and decorative elements that add a touch of individuality to each piece.

It’s important to note that Darrel Ralph’s designs may evolve over time, and he may introduce new features and innovations as the knife industry progresses. If you’re interested in specific models or features, it’s recommended to check the latest offerings from Darrel Ralph or authorized dealers for the most up-to-date information.

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Chad Nichols Ladder Pattern Damascus

Chad Nichols Ladder Pattern Damascus
Chad Nichols Ladder Pattern Damascus
Chad Nichols Ladder Pattern Damascus

Chad Nichols Ladder Pattern Damascus refers to a specific type of Damascus steel pattern created by Chad Nichols, a renowned bladesmith and Damascus steel artisan. Damascus steel is not a specific type of steel but rather a method of forging and layering different types of steel to create a distinctive pattern on the blade. The ladder pattern is one of the many patterns that can be achieved through this process.

Here are some key characteristics of Chad Nichols Ladder Pattern Damascus:

  1. Pattern Design:
    • The ladder pattern features a repeating series of diagonal lines that resemble the rungs of a ladder. This creates a visually striking and intricate design on the surface of the blade.
  2. Layering Technique:
    • Damascus steel is typically made by forge-welding layers of different steels together. The ladder pattern involves manipulating and twisting the layers during the forging process to create the specific ladder-like appearance.
  3. Materials:
    • Chad Nichols is known for working with various high-quality and exotic steel alloys, often combining stainless and tool steels. The choice of materials contributes to the overall performance and aesthetics of the Damascus steel.
  4. Expertise:
    • Achieving a consistent and well-defined ladder pattern requires a high level of skill and craftsmanship. Chad Nichols is recognized for his expertise in creating intricate and high-quality Damascus patterns.
  5. Application:
    • Knives with Chad Nichols Ladder Pattern Damascus are highly sought after for their artistic appeal. These knives are often used in custom and high-end production knives, as well as in collaboration with other knife makers.
  6. Customization:
    • Chad Nichols may produce custom Damascus steel for knife makers, allowing them to use his signature ladder pattern in their own knife designs.

It’s worth noting that Damascus steel patterns, including the ladder pattern, are not only about aesthetics but can also influence the performance of the knife. The layering process can enhance qualities such as strength, flexibility, and edge retention.

Keep in mind that information about specific patterns and techniques used by bladesmiths may evolve over time, and it’s always a good idea to check directly with the artisan or manufacturer for the latest details on their creations.

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Is Stainless Steel A Good Steel Choice?

Gun Hammer

Stainless steel is a popular choice for custom knives due to its corrosion resistance and ease of maintenance. However, like any material, it comes with its own set of pros and cons. Some positive and negative considerations for using stainless steel in custom knives come to mind.

One of the primary advantages of stainless steel is its resistance to corrosion. This makes it an excellent choice for knives that may be exposed to moisture and environmental elements.

Stainless steel requires less maintenance compared to carbon steels. It is less prone to rust and staining, and it’s generally easier to clean.

There are various types of stainless steels available, each with its own set of properties. This allows knife makers to choose a stainless steel that aligns with specific requirements such as hardness, toughness, and edge retention.

Stainless steel can be polished to a high shine, offering a visually appealing and modern look. Some stainless steels also allow for intricate etching or patterning, enhancing the knife’s aesthetic appeal.

Stainless steel is non-reactive and does not impart flavors or odors to food. This makes it a good choice for knives used in food preparation.

While some high-end stainless steels offer excellent edge retention, others may not perform as well as certain carbon steels. Knife enthusiasts who prioritize edge retention might opt for specific high-performance stainless steels

Some stainless steels can be more challenging to sharpen compared to softer carbon steels. This depends on the specific alloy and heat treatment used.

Some stainless steels, particularly those with high hardness, can be more brittle than their softer counterparts. This means they may be more prone to chipping or breaking under heavy impact or lateral stress.

High-quality stainless steels with exceptional properties can be more expensive than budget-friendly options. The cost of materials can influence the overall price of the custom knife.

Achieving optimal performance from stainless steel often requires precise heat treatment. This can be more complex compared to some other types of steel.

Ultimately, the choice of stainless steel for a custom knife depends on the specific needs and preferences of the user. Knife makers often select stainless steel based on the intended use of the knife and the desired balance of properties.

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Different Knife Steels

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There are various types of knife steel, each with its own properties and characteristics that make it suitable for different purposes. The choice of knife steel depends on factors such as hardness, corrosion resistance, edge retention, and ease of sharpening. Here are some common types of knife steel:

  1. Stainless Steel:
    • 440 Stainless Steel: Common in budget knives.
    • AUS-8/AUS-10: Japanese stainless steel with good balance.
    • VG-10: High-quality stainless steel often used in Japanese knives.
  2. Tool Steel:
    • O1 Steel: Known for its toughness and wear resistance.
    • D2 Steel: Offers excellent wear resistance but can be more difficult to sharpen.
    • M2 Steel: High-speed tool steel with great edge retention.
  3. High Carbon Steel:
    • 1095 Steel: A simple carbon steel with good toughness and edge retention.
    • 52100 Steel: Used in high-end, hand-forged knives with excellent wear resistance.
  4. Damascus Steel:
    • Damascus: Not a specific type of steel but a forging technique involving layering different steels for a distinctive pattern. Damascus knives often combine high and low carbon steels for a balance of properties.
  5. Powdered Steel:
    • CPM-S30V, CPM-S35VN: Powder metallurgy stainless steels known for excellent edge retention and corrosion resistance.
    • CPM-154: A premium powdered steel with a good balance of edge retention and toughness.
  6. Super Steels:
    • M390, CTS-204P, CPM-20CV: Part of a group of high-performance stainless steels with exceptional edge retention and corrosion resistance.
  7. Ceramic Blades:
    • Zirconium Oxide (Zirconia): Not a metal, but ceramic knives are known for being very sharp and resistant to corrosion.
  8. H1 Steel:
    • Known for its corrosion resistance, often used in diving knives due to its ability to withstand saltwater.
  9. N690 Steel:
    • A high-quality stainless steel with a good balance of corrosion resistance and edge retention.

It’s important to note that the heat treatment and manufacturing processes also play a significant role in determining a knife’s performance, regardless of the steel type. The best steel for a knife depends on the intended use and personal preferences of the user.