M34 Molybdenum High-Speed Tool Steel (UNS T11334)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Other Designations


High-speed tool steels are of two types, namely molybdenum high-speed steels and tungsten high-speed steels. The molybdenum high-speed steels are also referred to as Group M steels. In the United States, 95% or more of all manufactured high-speed steels are the Group M steels. The high-speed tool steel types have equal performance but the molybdenum high-speed steels have relatively lower initial cost. To enhance performance and tool service life, tools made of high-speed tool steel can be coated with titanium carbide, titanium nitride, and other coatings using the physical vapor deposition process.

There are many types of molybdenum high-speed steels. The following data sheet will provide details relating to M34 molybdenum high-speed steel.

Chemical Composition

The following table shows the chemical composition of M34 steels.

Element Content (%)
C 0.85-0.92
Mn 0.15-0.40
Si 0.20-0.45
Cr 3.50-4.00
Ni 0.3
Mo 7.75-9.20
W 1.40-2.10
V 1.90-2.30
Co 7.75-8.75
Cu 0.25
P 0.03
S 0.03

Physical Properties

The physical properties of M34 steels are outlined in the following table.

Physical properties Conditions
T (°C) Treatment
Density 7.7-8.03 x 1000 kg/m3 25 -

Mechanical Properties

The mechanical properties of M34 steels are tabulated below.

Mechanical properties Conditions
T (°C) Treatment
Poisson's ratio 0.27-0.30 25 -
Elastic modulus 27557-30458 ksi 25 -

Other Designations

Other designations that are equivalent to AISI M34 molybdenum high-speed tool steels include:

  • DIN 1.3249
  • B.S. BM 34
  • ASTM A600
  • FED QQ-T-590
  • UNS T11334

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