ThePipingMart Blog Grades M6 Tool Steel (UNS T11306) – Composition, Properties and Uses

M6 Tool Steel (UNS T11306) – Composition, Properties and Uses

Tool Steel M6

UNS T11306 is an all-purpose and versatile steel that can make high-quality tools and components. This type of steel is extremely strong and durable, making it ideal for metalworking applications. It has a wide range of physical and chemical properties that make it suitable for many different types of projects. This guide will discuss the composition, chemical properties, mechanical properties, physical properties, uses, corrosion resistance, heat resistance, heat treatment, machining, and welding of Tool Steel M6.

M6 Tool Steel Composition

UNS T11306 is composed primarily of iron with small amounts of chromium and manganese. It also contains trace elements such as molybdenum and tungsten, which give it its unique characteristics. The exact composition varies depending on the grade but generally contains around 0.75% carbon.

C Si Mn P S Cr Mo V W Co
0.75~0.85 0.20~0.45 0.15~0.40 0.030 max 0.030 max  3.75~4.50  4.50~5.50 1.30~1.70 3.75~4.75 11.0~13.0

M6 Tool Steel Chemical Properties

Tool Steel M6 has excellent hardness and wear resistance due to its high carbon content and its other alloying elements, such as chromium, manganese, molybdenum and tungsten. It also features excellent corrosion resistance in most environments due to its low sulfur content.

M6 Tool Steel Mechanical Properties

AISI Tool Steel M6 has excellent strength at elevated temperatures due to its high alloying elements, which make it suitable for use in hot working applications such as forging or extrusion. It also exhibits good ductility, which makes it easy to form into various shapes without cracking or fracturing under stress loads. Additionally, it is resistant to shock loading thanks to its strong grain structure.

Proof strength
Rp0.2 (MPa)
Tensile strength
Rm (MPa)
Impact energy
KV (J)
Elongation at fracture
A (%)
Reduction in cross section on fracture
Z (%)
As-Heat-Treated Condition Brinell hardness (HBW)
532 (≥) 786 (≥) 14 41 43 Solution and Aging, Annealing, Ausaging, Q+T,etc 234

M6 Tool Steel Physical Properties

AISI Tool Steel M6 is bright silver when polished, making it aesthetically pleasing for use in applications where appearance matters, such as medical instruments or jewellery-making tools. It is also highly resistant to wear due to its hard surface, which allows it to hold up against heavy use without showing signs of wear over time. Finally, it has good machinability, so you can easily cut or shape the material into whatever shape you need with minimal effort or waste material generated during the process.

Property Density
Temperature T
Specific heat
J / kgK
Thermal conductivity
Electric resistance
Modulus of elasticity
Expansion rate
622 (≥) 346 (≥) 11 31 34 Solution and Aging, Annealing, Ausaging, Q+T,etc 422
Creep strain limit
(Rp1,0) N/mm2
Creep rupture strength
(Rp1,0) N/mm2
542 191 657

M6 Tool Steel Equivalent

USA Germany China Japan France England Italy ISO Czechia Austria Sweden Spain
M6 /UNS T11306/A600

M6 Tool Steel Uses

UNS T11306 Tool Steel M6 is a tool steel alloy used in industrial and commercial applications. It is known for its good thermo-mechanical properties and high hardenability, making it ideal for various engineering uses. It is commonly used for medical instruments and machine components and is also suitable for tools that require excellent wear resistance, like punches, reamers, taps, and dies. It can be heat treated or cold processed to the desired condition. Additionally, Tool Steel M6 is useful in construction, automotive assembly, injection moulding, pharmaceutical production and any application where superior strength and excellent dimensional stability are required.

Corrosion Resistance

Tool steel M6 is an incredibly resilient material renowned for its corrosion resistance. Its a high chromium and vanadium content makes it ideal for resisting the damaging effects of acidic substances like water and salt water. The combination of impact-resistant benefits with enhanced defence against oxidation makes tool steel M6 an excellent choice in industries that require reliable performance when exposed to harsh environmental conditions. In fact, tool steel M6 stands out amongst its contemporaries when it comes to long-term durability in weather-impacted applications, making it an indispensable ally for the most trying work conditions.

Heat Resistance

Tool Steel M6 is a premium grade of heat-resistant steel renowned for its impressive resistance to oxidation. With higher toughness and impact strength than other steels, this product enables applications that involve high temperatures and wear. Its unique formulation creates extremely low levels of deformation when exposed to extreme heat, making it very reliable for long-term use. Tool Steel M6 also features superior chemical resistance, ensuring it can tolerate harsh chemicals without losing its heat-resistant capabilities. Truly one of a kind, this heat-resistant steel offers maximum performance under the most challenging conditions.

Heat Treatment

Heat treatment is an important part of tool steel M6 production, and it can drastically affect the properties and performance of the final product. Each tool steel M6 heat treatment produces a specific material in terms of hardness, toughness and wear resistance. Proper heat treating ensures that every version of the tool steel has consistent levels of these properties. Heat treating involves heating the metal up to its desired temperature, maintaining it for a certain amount of time, and then cooling it down with either hot or cold water, depending on the desired chemical composition and physical characteristics parameter. With this technique, tool steel M6 can be manufactured as per requirement while improving its quality and reliability.


Tool steel M6 is a versatile essential for many machining processes. It’sIt’s highly heat-resistant, strong in compression, and capable of meeting exacting specifications. Tool steel M6 is hard enough to stand up to wear and tear during the cutting process — it can be successfully used for milling, drilling, broaching, grinding, and turning components. This steel type is especially valued for its high degree of consistency from batch to batch and its ultimate ability to withstand the rigours of continuous operations over an extended period of time. Overall, tool steel M6 is reliable whenever precision machining is needed.


Welding tool steel M6 is critical for several key industries, from automotive manufacturing to the blade industry. It’sIt’s a complex welding process due to the hardness of the material and requires professional expertise to be applied successfully. Using abnormal heat placement and developing appropriate feed rates can be essential in achieving a solid welded result. Appropriate tool selection and cooling procedures are also vitally important as they need to withstand the high temperatures while maintaining their hard wear and tear properties. While it can be difficult, experienced welders and those familiar with this technique have mastered its intricacies over the years. They now offer quality welding results with minimized risks.


In conclusion, Tool Steel M6 is an incredibly useful tool steel that can be used for various metalworking applications due to its excellent strength at elevated temperatures and good corrosion resistance in most environments. Its bright silver colour makes it aesthetically pleasing, while its hard surface provides great wear resistance over time with minimal signs of visible wear even after heavy use. And finally, its good machinability allows you to easily shape the material into whatever form you desire with minimal effort or waste generated during the process – making this type of steel one of the most versatile materials available today! Whether you’re looking for a reliable material for your next project or want something dependable enough for everyday use – look no further than Tool Steel M6!

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