ThePipingMart Blog Grades T15 Tool Steel (UNS T12015) – Composition, Properties, and Uses

T15 Tool Steel (UNS T12015) – Composition, Properties, and Uses

Tool Steel T15

UNS T12015 is a high-carbon, tungsten-containing alloy known for its superior abrasion resistance and machinability. This makes it an excellent choice for tools used in demanding applications such as automotive parts manufacturing or aerospace engineering. Let’s take a closer look at the composition, chemical properties, mechanical properties, physical properties, uses, corrosion resistance, heat resistance and heat treatment of tool steel T15.

Tool Steel T15 Chemical Composition

UNS T12015 contains 1.2% carbon and 12% tungsten. It also contains small amounts of chromium and vanadium for added strength and durability.

Element Content (%)
Tungsten, W 11.75-13
Cobalt, Co 4.75-5.25
Vanadium, V 4.50-5.25
Chromium, Cr 3.75-5
Carbon, C 1.50-1.60
Molybdenum, Mo 1 (max)
Nickel, Ni 0.3
Copper, Cu 0.25
Manganese, Mn 0.15-0.40
Silicon, Si 0.15-0.40
Phosphorus, P 0.03
Sulfur, S 0.03

Tool Steel T15 Chemical Properties

UNS T12015 has excellent wear resistance and hardness due to its high levels of carbon and tungsten. It has a melting point of 2850°F (1580°C).

Tool Steel T15 Mechanical Properties

Tool steel T15 offers flexibility, toughness, machinability, and grinding capabilities. It can be polished to a mirror finish if desired.

Properties Metric Imperial
Poisson’s ratio 0.27-0.30 0.27-0.30
Elastic modulus 190-210 GPa 27557-30457 Ksi
Izod impact unnotched 27.1 – 46.1 J 20.0 – 34.0
Abrasion (loss in mm3, tempered at 1025°F; ASTM G65 ) 8 8
Abrasion (loss in mm3, tempered at 1275°F; ASTM G65 ) 32.3 32.3
Hardness, Rockwell C (tempered at 1275°F) 46.5 46.5
Hardness, Rockwell C (tempered at 1025°F) 67.5 67.5

Tool Steel T15 Physical Properties

At room temperature, tool steel T15 has a density of 0.283 lbs/in3 (8 g/cm3). It has an electrical resistivity of 637 µohm-m at 68°F (20°C).

Properties Metric Imperial
Density 8.19 g/cm3 0.295 lb/in3

Tool Steel T15 Thermal Properties

Properties Conditions
T (ºC) Treatment
Thermal expansion 9.9 x 10-6/ºC 20-200
Thermal conductivity 20.9 x W/m-K 100

Tool Steel T15 Equivalent

  • DIN 1.3202
  • UNI 130505 KU
  • B.S. BT 15
  • ASTM A600
  • FED QQ-T-590
  • UNS T12001
  • UNS T12015
  • DIN 1.3202

Tool Steel T15 Uses

UNS T12015 is often used in applications that require superior abrasion resistance, such as automotive parts manufacturing or aerospace engineering components production. It is also used for cutting tools such as drill bits, saw blades or milling cutters.

Corrosion Resistance

Tool steel T15 has good corrosion resistance due to its high levels of chromium and vanadium content which inhibit oxidation processes on the material’s surface when exposed to air or water.

Heat Resistance

Tool steel T15 offers good heat resistance up to 1000°F (538°C), making it suitable for applications where temperatures reach those levels during regular use.

Heat Treatment

Tool steel T15 is commonly hardened by quenching in oil followed by tempering in the air or furnace cooling at low temperatures to reduce brittleness caused by the quenching process.


Machining tool steel T15 is relatively easy due to its good machinability rating; however, it does require sharp cutting tools with close attention paid to feed rate and speed settings due to its hard nature when fully hardened.


Welding can be done using standard welding techniques but using low heat settings so as not to cause warping due to excessive heat input into the material during the process.


Tool Steel T 15 is an incredibly versatile alloy that offers users superb abrasion resistance combined with excellent machinability and grinding capabilities, ensuring that it can meet any user’s needs in demanding applications requiring superior performance characteristics compared with other alloys available on the market today. Whether you are looking for an alloy for automotive parts manufacturing or aerospace engineering components production, tool Steel T15 should be considered when selecting your next metal alloy solution!

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