T5 Tool Steel (UNS T12005) - Tungsten High Speed Steel

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Tungsten high-speed tool steels are designated group T steels according to the AISI classification system and range from T1 to T15. These steels have similar characteristics to those of molybdenum high-speed tool steels. The following sections will discuss T5 tool steels in more detail.

Chemical Composition

The following table shows the chemical composition of T5 tool steels.

Element Content (%)
Tungsten, W 17.50-19.00
Chromium, Cr 3.75-5.00
Vanadium, V 1.80-2.40
Carbon,C 0.75-0.85
Molybdenum, Mo 0.50-1.25
Nickel, Ni 0.3
Copper, Cu 0.25
Silicon, Si 0.20-0.45
Manganese, Mn 0.20-0.40
Phosphorus, P 0.03
Sulfur, S 0.03
Iron, Fe Balance

Physical Properties

The physical properties of T5 tool steels are given in the following table.

Properties Metric Imperial
Density 8.75 g/cm3 0.316 lb/in3

Mechanical Properties

The mechanical properties of T5 tool steels are tabulated below.

Properties Metric Imperial
Poisson's ratio 0.27-0.30 0.27-0.30
Elastic modulus 190-210 GPa 27557-30458 ksi

Thermal Properties

The following table shows the thermal properties of T5 tool steels.

Properties Conditions
T (ºC) Treatment
Thermal expansion 11.2 x 10-6/ºC 20-100 -

Other Designations

Other designations that are equivalent to T5 tungsten tool steels include:

  • DIN 1.3265
  • UNI KU
  • JIS SKH 4A
  • B.S. BT 5
  • ASTM A600
  • FED QQ-T-590
  • SAE J437
  • SAE J438
  • UNS T12005

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