M35 Molybdenum High Speed Tool Steel (UNS T11335)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties

Introduction

Molybdenum high-speed steels are designated as Group M steels according to the AISI classification system. Over 95% of high-speed steels manufactured in the US are group M steels. Tungsten is present in all types from M1 to M10, except M6, and cobalt is not present in any of these steels. Molybdenum high-speed steels have similar performance when compared to tungsten high-speed steels. However, the initial cost of molybdenum tool steels is lower. Titanium nitride, titanium carbide and several other coatings can be used in tools made of this kind of steels through physical vapor deposition process to improve the performance and life span of the tool.

Chemical Composition

The following table shows the chemical composition of M35 molybdenum high speed tool steels.

Element    Content (%)
C 0.93
Cr 4.2
Co 4.9
Fe 76.52
Mo 5
Si 0.3
W 6.25
V 1.9

Physical Properties

The physical properties of M35 molybdenum high speed tool steels are given in the following table.

Physical properties Metric Imperial
Density 8.14 g/cm3 0.294 lb/in3

Mechanical Properties

The mechanical properties of M35 molybdenum high speed tool steels are tabulated below.

Mechanical properties Metric Imperial
Hardness, Rockwell C (oil quenched from 1232°C, 5 mins) 64.8 64.8
Hardness, Rockwell C (oil quenched from 1177°C, 5 mins) 65.2 65.2
Hardness, Rockwell C (oil quenched from 1204°C, 5 mins) 65.2 65.2
Modulus of elasticity 207 GPa 30000 ksi
Machinability (1% carbon steel) 45.0 - 50.0% 45.0 - 50.0%

Thermal Properties

The following table shows the thermal properties of M35 molybdenum high speed tool steels.

Thermal properties Metric Imperial
CTE, linear (@21 - 399°C / 69.8 - 750°F) 11.4 μm/m°C 6.33 μin/in°F
CTE, linear (@21 - 593°C /69.8 - 1100°F) 11.5 μm/m°C 6.39 μin/in°F

Comments

  1. Jeremy He Jeremy He United States says:

    useful. thanks

  2. john john United States says:

    very nice

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