Jul 15 2012
Topics Covered
IntroductionChemical CompositionPhysical PropertiesMechanical PropertiesOther Designations
Introduction
High-speed tools are divided into molybdenum high-speed steels and tungsten high-speed steels. Molybdenum high speed tool steels are known as Group M steels. They have lower initial cost even though both types of high-speed steels are equivalent in performance. Tools made using high-speed tool steels can be coated with titanium carbide, titanium nitride, and other coatings by physical vapor deposition process for enhancing performance and prolonging life of the tool. There are different types of molybdenum high speed tool steels. Except M6, M 1 to M 10 contains some tungsten, but no cobalt. M36 is a type of molybdenum high speed tool steels.
Chemical Composition
The following table shows chemical composition of M36 molybdenum high speed tool steels.
| Element |
Content |
| C |
0.80-0.90% |
| Mn |
0.15-0.40% |
| Si |
0.20-0.45% |
| Cr |
3.75-4.50% |
| Ni |
0.30% |
| Mo |
4.50-5.50% |
| W |
5.50-6.50% |
| V |
1.75-2.25% |
| Co |
7.75-8.75% |
| Cu |
0.25% |
| P |
0.03% |
| S |
0.03% |
Physical Properties
The physical properties of M36 molybdenum high speed tool steels are tabulated below.
| Physical properties |
Metric |
Imperial |
| Density |
8.18 ×1000 kg/m3 |
511 lb/ft3 |
Mechanical Properties
The mechanical properties of M36 molybdenum high speed tool steels are outlined in the following table.
| Mechanical properties |
Metric |
Imperial |
| Poisson's ratio |
0.27-0.30 |
0.27-0.30 |
| Elastic modulus |
190-210 GPa |
27557-30457 ksi |
Other Designations
Other designations that are equivalent to AISI M36 molybdenum high speed tool steel include:
- ASTM A600
- FED QQ-T-590
- UNS T11336