Blade Steel: M390

Blade Steel: M390

Published: July 26th, 2024

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.

Carbon is a critical element in all blade steels, and its high percentage in M390 contributes significantly to hardness and edge retention. The presence of 1.90% carbon allows the formation of hard carbides, which are essential for the steel's wear resistance. This high carbon content means M390 can achieve a high level of hardness through proper heat treatment, enhancing its cutting performance and durability.

Composition

Carbon- 1.9%

Chromium- 20%

Molybdenum- 1

Tungsten- 0.6%

Vanadium- 4%

Manganese- 0.3

Silicon- 0.7%

Chromium, at 20.00%, is vital for providing corrosion resistance. Chromium forms a passive layer on the steel surface, protecting it from rust and staining. This high chromium content ensures that M390 blades maintain their integrity and appearance even when exposed to harsh conditions. Chromium also contributes to the steel's hardness and wear resistance.

Molybdenum is another important element in M390, present at 1.00%. It enhances the steel's toughness and hardness, working synergistically with chromium to improve corrosion resistance. Molybdenum helps maintain the steel's strength at high temperatures, making M390 suitable for demanding applications.

Vanadium, at 4.00%, is crucial for wear resistance and toughness. Vanadium forms hard vanadium carbides, which contribute to the overall hardness and ability of the steel to hold a sharp edge. These carbides are among the hardest found in steel, ensuring that M390 blades maintain their sharpness even with repeated use.

Tungsten is included at 0.60% and further increases hardness and wear resistance. Tungsten helps the blade retain its sharp edge under heavy use, making M390 a reliable choice for tasks requiring consistent performance over time.

Silicon, present at 0.70%, aids in increasing strength and hardness. It also acts as a deoxidizer during the steel-making process, removing oxygen from the steel and improving its quality. This contributes to the overall performance and durability of M390.

Manganese, at 0.30%, improves toughness and hardness. It helps refine the grain structure of the steel, enhancing its strength and durability. Manganese also contributes to the ease of heat treatment, ensuring the steel achieves the desired hardness and toughness levels.

Bohler M390's composition results in blade steel that excels in edge retention, wear resistance, and corrosion resistance. These properties make it ideal for high-performance knives used in demanding conditions. The high carbon and vanadium content ensures that M390 blades hold a razor-sharp edge for an extended period, reducing the need for frequent sharpening. The combination of carbon, vanadium, and tungsten provides exceptional wear resistance, allowing the blades to withstand heavy use without significant wear.

Despite its high hardness, M390 can be sharpened relatively easily compared to other super steels. This ease of sharpening allows users to maintain a sharp edge with standard sharpening tools, ensuring consistent performance without specialized equipment.

These qualities make M390 a preferred choice for high-end knives and demanding applications, delivering reliable and superior performance for a variety of cutting tasks. Whether for everyday use, outdoor adventures, or professional applications, knives made with Bohler M390 steel provide outstanding performance and durability.

Many prominent knife manufacturers use M390 in their products. Microtech knives, for instance, are known for their precision engineering and high-quality materials, with many models featuring M390 steel for its excellent properties. Microtech, a brand synonymous with innovation and performance, often incorporates M390 into their blades to ensure they meet the rigorous demands of their users. The Microtech knife lineup includes various models that benefit from the superior edge retention and corrosion resistance of M390.

Microtech logo

Similarly, Bradford knives utilize M390 for its unmatched performance. The Bradford knife collection is well-regarded for its craftsmanship and durability, making M390 an ideal choice to uphold the brand's reputation for excellence. LionSteel, another prestigious knife manufacturer, incorporates M390 in their LionSteel knives to provide users with reliable and long-lasting cutting tools. LionSteel is known for blending traditional craftsmanship with modern technology, and the use of M390 steel aligns perfectly with its commitment to quality and innovation.

Bradford USA

Written by Drew Clifton


What to Buy

The Microtech Ultratech X-Wing Hellhound Tanto features a 3.35" Bohler M390 steel blade with a unique Apocalyptic finish. Its out-the-front automatic deployment is managed with a thumb slide open and lock mechanism. The handle is crafted from 6061-T6 aircraft-grade aluminum, and adorned with exclusive X-Wing detailing. Additional features include an ambidextrous stainless steel pocket clip, a glass breaker, and a lightweight design at 3.5 oz. Closed, the knife measures 5.01". This SMKW exclusive model embodies Microtech's renowned craftsmanship, proudly made in the USA.


The Bradford Guardian 3.5 features a 3.5-inch M390 stainless steel blade with a sleek stonewash finish, offering superior edge retention and corrosion resistance. Its 3D contoured natural micarta handle provides a secure and comfortable grip, perfect for extended use in various outdoor tasks. With an overall length of 7.75 inches, this fixed-blade knife ensures durability and reliability. It includes a versatile leather sheath for easy carry and accessibility. Whether for hunting, camping, or everyday tasks, the Bradford Guardian 3.5 combines functionality and craftsmanship, making it an essential addition to any collection.


The LionSteel Myto knife features a sleek red aluminum handle and a satin-finished M390 steel blade, known for exceptional edge retention and corrosion resistance. The 3.27-inch blade excels in precision cutting, while the overall length of 7.68 inches ensures a balanced grip. Equipped with a flipper opening mechanism and a secure frame lock, it guarantees swift, one-handed operation. Weighing just 3.67 ounces, the Myto is lightweight yet robust. The integrated titanium backspacer and lanyard hole add to its versatility, making it a perfect blend of style, performance, and durability for everyday carry.


Expert Reviewed

T.C. Barnette

T.C. Barnette

T.C. Barnette is a dynamic media personality and the esteemed spokesperson for SMKW (Smoky Mountain Knife Works), where his passion for knives intersects with his captivating on-screen presence. With a magnetic charisma and deep expertise in cutlery, T.C. has become a beloved figure in the knife community.