The development of 420HC steel was a shift in cutlery history, moving away from specialized boutique alloys toward a metal that prioritizes the needs of the everyday user. Before its invention, the knife industry often struggled to find a middle ground between rust-resistance and cutting performance. The steel’s parent alloy, AISI 420, had great corrosion resistance, but it was largely relegated to low-cost kitchen knives and diving gear. Because it lacked sufficient carbon, it simply could not hold a sharp edge under the pressure of real-world work. Everything changed in...

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Known for its good balance of durability, sharpness, and corrosion resistance, 440 stainless steel has become a favorite among knife enthusiasts and manufacturers. 440 stainless steel is a family of alloy steels containing varying amounts of carbon, chromium, and other elements. The 440 series is typically composed of three main variants: 440A, 440B, and 440C. Each variant has slightly different compositions, resulting in varying hardness levels, corrosion resistance, and edge retention...

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The origins of 52100 steel trace back to around 1905 when it was first introduced for use in roller ball bearings. Originating from Germany and France, these early chromium alloy steels, initially known as 5295, marked a shift in the materials used for bearings. 52100 has gone by various names, such as 100cCr6, 1,3505, 14116, GCr15, and SUJ2. In 1919, it officially became known as 52100 under SAE (Society of Automotive Engineers) International designations. Despite being a lesser-known steel, it has gained prominence in the realm of...

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7Cr17MoV is a widely used stainless steel that occupies a very different place in the modern knife world than high-end powder metallurgy alloys. It is a Chinese-produced martensitic stainless steel derived from the same general family as 440A, developed to offer strong corrosion resistance, ease of maintenance, and consistent performance at a more accessible cost. Its designation follows the Chinese GB standard naming system, where the “7” indicates approximately 0.7 percent carbon, “Cr17” reflects roughly 17 percent chromium, and the added molybdenum and...

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8Cr13MoV is often considered the Chinese counterpart to AUS-8, with a nearly identical chemical composition. The naming convention for these steels is highly descriptive. The first number, in this case, “8,” refers to the approximate carbon content, around 0.8%, which influences hardness and strength. “Cr13” indicates the chromium content at 13%, which is responsible for the steel’s stainless properties. The "Mo" refers to a small amount of molybdenum added to enhance toughness, grain refinement, and corrosion resistance. Lastly...

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AUS-8 is a stainless steel that has been a staple in the knife world for decades, offering a well-balanced combination of corrosion resistance, toughness, and ease of sharpening. Developed by Aichi Steel Corporation in Japan, AUS-8 belongs to a family of steels that also includes AUS-6 and AUS-10, each progressively increasing in carbon content and performance characteristics. AUS-8 sits in the middle, making it an ideal choice for knife users who want dependable performance without venturing into premium-priced territory. The composition of AUS-8 includes...

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AUS-10A is a Japanese stainless steel developed by Aichi Steel, part of a broader family that includes AUS-6 and AUS-8. It was engineered to improve on earlier compositions by increasing carbon and optimizing alloying elements to create a more capable, well-rounded blade steel. In practice, AUS-10A occupies a middle ground between traditional stainless steels like 440C and more modern, higher-alloy powder steels, offering a balance that has made it increasingly common in production knives over the past decade. At its core, AUS-10A is defined by a carefully balanced composition...

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Long before K110 appeared in production and custom knives, its origins were in the demanding industrial environment of cold work tooling, where resistance to abrasion, dimensional stability, and long service life mattered far more than corrosion resistance or ease of sharpening. K110 was developed by Böhler, the Austrian steelmaker founded in the nineteenth century by brothers Albert and Emil Böhler, a company that would later merge with Sweden’s Uddeholm to form Böhler-Uddeholm in 1991. K110 belongs to the family of high-carbon, high-chromium cold work tool steels...

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Bohler M390 is celebrated in the knife industry for its superior performance attributes, making it a top choice for high-end blades. This steel is known for its remarkable wear resistance, corrosion resistance, and edge retention. These qualities stem from its unique composition, which combines several elements in specific proportions to enhance its overall properties. M390 is martensitic stainless steel, which means it has a high hardness level and offers excellent corrosion resistance...

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Böhler M398 is one of the newest and most advanced stainless powder metallurgy steels available to knife makers today, but its origins can be traced back through decades of metallurgical innovation rather than a single breakthrough. The alloy is the product of Böhler’s long-standing effort to push the limits of wear-resistant stainless tool steels, a pursuit that began well before M398 itself existed. Founded in Vienna, Austria, in 1870, Böhler established a reputation for producing premium specialty steels for some of the world's most demanding industries. Over the following century...

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Böhler N690 is today one of the most recognized European stainless steels for knives, but its story reaches back to the late 1990s when Böhler-Uddeholm sought to provide a tougher, more versatile alternative to the long-established 440C. Introduced around 1998, N690 was developed as a martensitic stainless steel with balanced additions of cobalt and molybdenum. It aimed to combine dependable corrosion resistance with edge retention and ease of finishing, qualities that appealed to toolmakers and knifemakers alike. Much like...

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Long before steels such as CPM 15V, Maxamet, and other modern wear-resistant alloys entered the market, CPM 10V established itself as a benchmark for extreme edge retention. Originally developed for industrial tooling rather than knives, it was a breakthrough in powder metallurgy and demonstrated what could be achieved when the limitations of conventional steelmaking no longer constrained metallurgists. The history of CPM 10V begins long before the steel itself was introduced. Throughout the first half of the twentieth century, metallurgists were searching for...

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CPM 15V is a high-vanadium tool steel developed by Crucible Industries. It was first developed in the late 1970s as a more wear-resistant version of CPM 10V, though it did not reach the market until around 1990. Like other Crucible steels in the CPM series, it is made using particle metallurgy, which helps create a fine, even distribution of carbides throughout the steel. This allows it to incorporate unusually high levels of vanadium without the problems associated with large, irregular...

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When knife enthusiasts talk about premium stainless steels that balance edge retention, corrosion resistance, and everyday practicality, CPM 20CV is almost always part of the discussion. It has become one of the defining “high-end EDC” steels of the modern era, prized for its ability to hold a working edge through long cutting sessions while resisting rust in conditions that would quickly tarnish many tool steels. Like most standout blade steels of the last three decades, it owes its reputation not only to its chemistry, but to the manufacturing process that made that chemistry usable...

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CPM 3V is known today as one of the toughest steels in use for knives, but its story stretches back decades before it was introduced in 1997. Designed by Crucible Industries through their particle metallurgy process, 3V was created to solve a problem toolmakers had long wrestled with: how to combine extreme toughness with useful wear resistance. Previous steels forced compromises; shock-resistant alloys like S7 could withstand punishment but dulled quickly, while wear-resistant steels like D2 held an edge but were prone to chipping...

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Cru-Wear occupies a unique niche in the realm of knife steels. It boasts a reputation for achieving a near-perfect harmony between two crucial properties – toughness and wear resistance. This delicate balance makes Cru-Wear a compelling choice for blades tasked with demanding applications. Understanding Cru-Wear's effectiveness necessitates exploring its composition. Unlike some traditional steels, Cru-Wear is crafted through a process known...

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In the world of knives, the choice of blade steel is a critical factor that can significantly impact performance, durability, and overall functionality. The creation of Crucible Industries' CPM (Crucible Particle Metallurgy) technology has paved the way for a refined version of D2 tool steel, known as CPM-D2. D2 tool steel, originally invented in the early 20th century, has long been recognized for its high carbon content (1.55%) and a substantial amount of chromium (12%). While offering remarkable...

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CPM-M4 is a high-speed tool steel originally developed by Crucible Industries for demanding industrial applications such as punches, dies, and cutting tools. Produced using Crucible’s proprietary Crucible Particle Metallurgy (CPM) process, CPM-M4 exhibits a fine and uniform carbide distribution that enhances its toughness and grindability relative to traditional ingot metallurgy tool steels. Its composition includes...

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For centuries, knifemakers have tirelessly pursued the perfect blade steel, a material that offers an ideal balance of hardness, edge retention, toughness, and corrosion resistance. While numerous steel alloys have emerged throughout history, each often excels in one area at the expense of another. Enter MagnaCut, a revolutionary steel designed specifically for the knife industry, promising a near-mythical equilibrium of these crucial properties. This article delves into the history of MagnaCut...

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When knife enthusiasts discuss steels that stretch the limits of what a cutting edge can do, CPM Rex 121 is almost always part of the conversation. It is one of the most alloy-rich and abrasion-resistant steels ever produced by Crucible Industries, and although it was never designed for knives, it has earned a reputation as an extreme performer in specialized cutting tools. Understanding why requires looking at its development as an industrial steel, the unusual recipe that defines it, and the small but dedicated group of makers who work with it today...

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The inception of S30V dates back to the early 2000s. Crucible Industries, a leader in the production of high-grade steel, aimed to create a new type of steel that would meet the rigorous demands of knife users. Partnering with knife maker Chris Reeve, they embarked on developing a blade steel that could deliver exceptional performance in various conditions. S30V is a martensitic stainless steel, characterized by its hardness and...

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Crucible Industries changed the landscape of high-end cutlery in 2006 with the introduction of CPM S110V. This steel pushed the theoretical limits of what a stainless alloy could achieve in terms of wear resistance. To appreciate the historical significance of S110V, one must first understand the era in which it was born. By the mid-2000s, the knife industry was moving away from traditional ingot steels toward the more sophisticated world of powder metallurgy. Crucible’s proprietary Crucible Particle Metallurgy process allowed for a...

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CPM SPY27 was introduced in 2020 as an exclusive steel developed for Spyderco and produced by Crucible Industries using the Crucible Particle Metallurgy process. After decades of working with advanced production steels from around the world, Spyderco partnered directly with Crucible to create an alloy built to its own specifications. The result was a stainless powder metallurgy steel designed for long-term use in Spyderco’s core American-made models rather than a short-run experiment. The CPM process is central to SPY27’s performance...

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CTS 204P is a modern high-alloy stainless steel that emerged from the rapid development of powder metallurgy tool steels in the late twentieth and early twenty-first centuries. Produced by Carpenter Technology Corporation, it belongs to the company’s CTS series of steels and is manufactured using Carpenter’s Micro-Melt powder metallurgy process. The alloy was originally named Micro-Melt 20-4 when it was introduced in 2009, but it was soon renamed CTS-204P in 2010, as it entered broader industrial use. While it was initially designed for the grueling demands of...

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The evolution of high-performance stainless steel reached a significant milestone with the development of CTS BD1N by Carpenter Technology Corporation, but its story truly begins with a specific request from one of the knife industry's most prolific innovators, Sal Glesser of Spyderco. For decades, Spyderco had relied on Gingami-1 (also known as G-2), a Japanese "silver paper" steel from Hitachi that served as the gold standard for high-performance stainless cutlery. However, as global supply chains shifted, Glesser sought an American-made equivalent that...

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The story of CTS XHP begins in the 1990s when metallurgists at Carpenter Technology were looking to achieve what seemed like a balancing act: they wanted the supreme hardness found in tool steels like D2, yet also the stainless characteristics of steels like 440C. Back in 1994, a patent was granted for a steel called 440XH, the brainchild of Paul Novotny, Thomas McCaffrey, and Raymond Hemphill. Their experiments aimed to raise hardness beyond what 440C...

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D2 steel got its start in the early part of the 20th century as part of a group of high-carbon, high-chromium cold-work tool steels. These steels were designed for industrial tooling like stamping dies, punches, and shear blades. In those environments, the goal was simple: build something that could keep cutting or shaping metal day after day without wearing out or changing shape. D2’s formula hit the sweet spot for this kind of work, offering high hardness...

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Among modern blade materials, few have cultivated the mystique and loyal following of INFI. Unlike mainstream knife steels, which can be traced directly to industrial tool steel catalogs or mass-market powder metallurgy manufacturers, INFI exists exclusively within the realm of the Busse Combat and its founder, Jerry Busse. For decades, it has sparked intense debate among enthusiasts, metallurgists, and collectors trying to decipher the secret to its legendary performance. While community research and independent analysis have gradually shed light on its chemical...

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The development of MagnaMax marks another major milestone in modern knife steel history, continuing the influence of metallurgist Dr. Larrin Thomas on the cutlery world. Thomas, who gained widespread recognition for creating CPM MagnaCut, introduced MagnaMax in 2025 as part of his ongoing research into optimizing stainless steels for real-world knife use. Whereas MagnaCut revolutionized the balance of toughness, corrosion resistance, and wear resistance, MagnaMax was conceived to push further in...

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Maxamet didn’t begin its life in the knife world. Instead, it comes from an industrial background that prioritized extreme hardness and wear resistance. Carpenter Technology originally developed Maxamet as part of its Micro-Melt family of powdered metallurgy tool steels, a line created for tooling environments where components face continuous abrasion, heavy pressure, and constant mechanical contact. Steels in this family were engineered to outperform traditional high-speed steels by offering finer carbide distribution and higher...

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Nitro-V is a stainless steel specifically engineered for knife makers, first introduced in 2017 by New Jersey Steel Baron (NJSB), a steel distributor known for catering to the cutlery industry. Nitro-V is a modified version of AEB-L, a stainless steel that was originally developed by Uddeholm for use in razor blades. AEB-L gained popularity among custom knife makers due to its ultra-fine grain structure, ease of sharpening...

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O1 traces its origins to 1905, when Charles Halcomb founded Halcomb Steel in Syracuse, New York, after leaving Crucible Steel, where he had served as the company's first president. At a time when American steelmakers were aggressively experimenting with new alloy combinations to meet the growing demands of industry, Halcomb Steel introduced an oil-hardening tool steel known as "Ketos." Developed by metallurgist John A. Mathews, Ketos quickly distinguished itself as a practical solution for precision tooling. In an ironic twist, Halcomb Steel would eventually be acquired...

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Sandvik’s 12C27 sits within a long lineage of Swedish stainless steels developed for cutting applications, and to understand it properly, it helps to begin with the base material it evolves from. Sandvik 12C27 itself was originally developed in the 1970s as a martensitic stainless chromium steel for industrial and professional cutting tools, where a clean edge, corrosion resistance, and predictable heat treatment behavior were more important than extreme alloy complexity. Over time, that balance translated naturally into knife making, where 12C27 became....

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Sandvik 14C28N is a high-performance stainless steel designed specifically for use in knife blades, offering a well-balanced mix of hardness, corrosion resistance, and edge retention. Manufactured by Sandvik Materials Technology in Sweden, this steel was developed as an improvement over Sandvik’s earlier 13C26, incorporating additional elements and refining the properties to better meet the needs...

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SLD Magic is a relatively recent development in the long history of cold-work tool steels, and its story begins not in the knife world but in industrial tooling. Developed by Hitachi Metals in Japan as part of their SLD family of steels, it was designed as a next-generation refinement of SKD11-type alloys, which are themselves closely related to the widely known D2 tool steel. The goal was to create a material that could address several persistent problems in die and mold manufacturing at once: wear, distortion during heat treatment, and machining difficulty...

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AEB-L is a stainless steel that has quietly earned a strong reputation among knife makers and enthusiasts. Originally developed in Sweden by Uddeholm in the mid-20th century, it was designed not for knives, but for razor blades. It may seem strange that a steel forged for shaving would go on to become a staple in custom and production knives, but once its full potential was realized, AEB-L quickly carved out its place in the modern blade...

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Emerging in 2006, Vanax35 and Vanax75 served as early iterations, showcasing the immense potential of nitrogen-based steels with their unparalleled corrosion resistance. However, their focus remained firmly on industrial environments. 2017 marked a pivotal moment, with the unveiling of Vanax Super Clean (also known as Vanax 37) at the Blade Show. This marked a strategic shift for Böhler-Uddeholm...

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VG-10 is a stainless steel that has become a popular choice for knife blades, particularly in the cutlery industry. Originally developed in Japan by Takefu Special Steel Co., VG-10 was designed to meet the demanding performance needs of chefs and knife makers. The designation “VG” stands for “V Gold,” indicating its high quality, and the steel was intended from the outset to combine corrosion resistance, edge retention, and...

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ZDP-189 is one of the most famous Japanese “super steels,” created by Hitachi Metals during a period when the knife industry was pushing the limits of stainless steel. It is unusual right from the start, with a chemistry that combines extremely high carbon at about 3 percent and chromium at 20 percent, far above the norm for most cutlery steels. These two elements alone define most of its character, but its full composition also includes 1.4 percent molybdenum, 0.6 percent tungsten, 0.1 percent vanadium...

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The story of Böhler-Uddeholm begins long before the two companies ever joined forces. In fact, their separate origins span centuries and reflect the metallurgical traditions of two European regions renowned for their steelmaking heritage: Austria and Sweden. In Austria, Böhler’s roots can be traced to the town of Kapfenberg, where iron production was documented as early as 1446. The modern history of the company, however, begins in 1870, when Emil and Albert Böhler established a steel trading firm in Vienna. Initially, they imported tool steels from Germany for distribution throughout...

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The history of Carpenter Technology Corporation is essentially the history of American industry solving its most difficult material problems. Since its founding in 1889, the company has avoided the mass-market steel used for common infrastructure. Instead, it has focused on specialty alloys, the kind of metals required where standard iron would melt, snap, or rust away. Today, with its materials found in nearly every Pentagon weapons system, the medical field, and the majority of commercial jet engines, Carpenter is the primary source for the high-performance metals that drive modern...

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Crucible Industries has a long and complex history that began in the 18th century. Its roots trace back to Sheffield, England, where the Sanderson Brothers were manufacturing crucible steel as early as 1776. The crucible process involved melting steel in small batches using clay or graphite pots at very high temperatures. Though time-consuming and labor-intensive, this method allowed for greater purity and consistency in the steel, which was especially valuable for tools, dies, and cutting instruments. In 1876, the Sanderson Brothers brought their...

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Damasteel AB, established in 1995, is a Swedish company known for producing high-performance patterned steel through a unique powder metallurgy process. The company originated from a partnership between Per Billgren, an Erasteel employee, and master blacksmith Kaj Embretsen, who sought to develop a modern alternative to traditional Damascus steel. Their collaboration resulted in a proprietary method for creating stainless patterned steel with exceptional durability and aesthetic appeal, revolutionizing the steel...

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Erasteel’s history begins long before the company took its modern form. Its earliest origins can be traced to European steelmaking centers that eventually merged their operations. In Sweden, the Söderfors forge began producing iron in 1676 and continued doing so for generations. Other Swedish works at Vikmanshyttan, Langshyttan, and Österbybruk grew through the eighteenth and nineteenth centuries. In France, steel production expanded throughout the nineteenth century at Commentry and Champagnole. These facilities operated independently for decades, but their production methods...

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Niagara Specialty Metals has built its reputation in the portion of the steel industry where performance alloys become workable material. Its focus has been the conversion and processing of specialty steels into sheet and plate with consistent thickness, flatness, and condition, so customers can machine, heat treat, and manufacture with predictable results from one lot to the next. Niagara was founded in 1982 in Akron, New York, by J. Barry Hemphill and Louis Valery. The region’s industrial base, transportation access, and skilled trades workforce supported a business model...

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In the intricate world of blades and knives, Damascus steel often emerges as a subject shrouded in mystery and allure. Known for its distinctive patterns, resilience, and historical significance, Damascus steel continues to intrigue both enthusiasts and skeptics alike. With myths and facts intertwined, understanding the true essence and capabilities of Damascus steel is crucial for appreciating its modern applications and dispelling the misconceptions surrounding it. One prevailing myth suggests that today's Damascus steel is fundamentally different...

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