ThePipingMart Blog Grades M44 Tool Steel (UNS T11344) – Composition, Properties and Uses

M44 Tool Steel (UNS T11344) – Composition, Properties and Uses

Tool Steel M44

M44 Tool Steel is a high-carbon, high-chromium cobalt tool steel that offers great wear resistance, strength, and hardness. It is often used in applications where high temperatures and pressure are present. This type of steel has excellent mechanical and physical properties, so it is highly sought after by many industries. This blog post will explore Tool Steel M44, including its composition, mechanical properties, physical properties, uses, corrosion resistance, heat resistance, heat treatment options, machining capabilities, and welding techniques.


Tool Steel M44 contains the following elements in its composition: 0.77-0.85% Carbon (C), 0.80-1.00% Chromium (Cr), and 4.00-5.00% Cobalt (Co). It also contains trace amounts of Manganese (Mn), Silicon (Si), Phosphorous (P), Sulfur (S) and Nickel (Ni).

Element Content (%)
Cobalt, Co 11-12.25
Molybdenum, Mo 6-7
Tungsten, W 5-5.75
Chromium, Cr 4-4.75
Vanadium, V 1.85-2.2
Carbon, C 1.10-1.20
Silicon, Si 0.3-0.55
Nickel, Ni 0.3
Copper, Cu 0.25
Manganese, Mn 0.2-0.4
Phosphorus, P 0.03
Sulfur, S 0.03

Mechanical Properties

M44 Steel offers excellent wear resistance due to its high chromium content, which helps prevent wear and tear on the steel when exposed to abrasive materials or extreme temperatures or pressures. The cobalt content gives it a higher degree of hardness than other steels in its class, making it ideal for cutting tools such as drill bits and taps and for cold work applications, including dies and reamers. It also has an excellent tensile strength of 800-1000 MPa, making it suitable for heavy-duty applications such as forging operations, hammering, etc.

Properties Metric Imperial
Tensile strength 650-880 MPa 94275-127633 psi
Yield strength 350-550 50763-79771 psi
Modulus of elasticity 190-210 GPa 27557-30458 ksi
Poisson’s ratio 0.27-0.3 0.27-0.3
Elongation 8-25% 8-25%

Physical Properties

Grade M44 has a very low thermal expansion rate, making it ideal for use in extreme temperature environments. It provides good dimensional stability during heat treatment processes such as annealing or hardening processes, etc. Its low conductivity also helps reduce energy loss during these processes making it more efficient than other steels in this class.

Properties Metric Imperial
Density 7.7-8.03 g/cm3 0.278 – 0.290 lb/in3

Thermal Properties

Properties Metric Imperial
Thermal conductivity 25 W/mK 173.3².°F


  • ASTM A600
  • FED QQ-T-590


M44 Tool Steel can be used to make a variety of cutting tools such as drill bits, taps and dies, which are used in metalworking industries; cold work applications; forging operations; hammering tools; castings; plastic molds; machine parts; automotive components; aerospace components etc., offering superior durability under extreme conditions such as high temperatures or pressures etc.

Corrosion Resistance

M44 Tool Steel has excellent corrosion resistance due to its chromium content which helps prevent rust formation on the surface when exposed to water or other corrosive substances over time. The cobalt content also protects against corrosion from acids or alkalis, which can cause damage to some steels if left unprotected for too long. Additionally, its low thermal expansion rate further increases its corrosion resistance by reducing any stress that could lead to cracking or breakage over time if not properly managed during the manufacturing process etc.

Heat Resistance

Due to its high chromium content Tool, Steel M44 offers excellent heat resistance up to 1150°C, which makes it suitable for use in extremely hot environments where other steels may not survive the intense temperatures without melting or losing their properties altogether.

Heat Treatment

Additionally, it can be treated with various heat treatments such as annealing or hardening, depending on what you need from your particular application requiring specific mechanical properties from the steel itself at certain temperatures etc.


As mentioned above, Tool Steel M44 can be machined easily due to its hardness making it suitable for precision machining operations that require tight tolerances with little error margin allowable during production runs etc.


It can also be welded using TIG welding techniques, although extra care must be taken when doing so since too much heat input can damage the structure of the steel itself, causing weak points during operation later on down the line if not done properly by experienced personnel familiar with these types of welding techniques etc.


In conclusion Tool Steel M44 offers excellent wear resistance thanks to its high chromium content giving it superior strength and hardness compared with other steels in this class while still providing good ductility so that it won’t shatter under extreme pressure or temperature conditions like some other alloys might do if mishandled during design/manufacturing stages throughout production life cycles etc. Furthermore, its low thermal expansion rate coupled with good corrosion/heat resistant properties make it ideal for use in several industries ranging from automotive components up through aircraft manufacturing, requiring precision cuts within tight tolerances that cannot be achieved with most standard steel grades available today making this alloy one of the best choices when performance matters most! With proper heat treatment processes applied correctly depending on each application’s requirements, you can rest assured knowing you’re getting top-quality results from your tool steel every time, no matter what industry you’re working within!

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