PM 23 high-speed tool steel is a high alloyed powder metallurgical high-speed steel corresponding to AISI M3:2. This steel has a very good abrasive wear-resistance in combination with a high compressive strength. It is suitable for demanding cold work applications like blanking of harder materials such as carbon steel or cold rolled strip steel, and for cutting tools. Its machinability and grindability are superior than that of conventional high-speed steel, along with its dimensional stability after heat treatment has been applied.
Other Known Names: ASP 2023, S790, M3-2
Griggs Steel Color Code:Salmon
Common Usage
Broaches, Gear Cutters, Knives, Rolls, Taps
Physical Properties
Density
0.287 lb/in3 (8256 kg/m3)
Modulus Of Elasticity
33 x 106 psi (230 GPa)
High Speed Steel Properties Comparison
PM 23 High Speed Steel Chemical Composition
| Maximum | Typical | ||||||
|---|---|---|---|---|---|---|---|
| Carbon | Chromium | Tungsten | Molybdenum | Vanadium | Cobalt | Annealed | Tempered |
| C | Cr | W | Mo | V | Co | Hb | HrC |
| 1.28 | 4 | 6.4 | 5 | 3.1 | - | 260 | 64 |
PM 23 High Speed Steel Heat Treating
| Annealing | Preheat | Austenitizing | Quench | Tempering |
|---|---|---|---|---|
| Temp | Temp | Temp | Medium | Temp |
| °F | °F | °F | °F | |
| 1575/1625 | 1550/1600 | 2125/2175 | Salt/Oil/Atm | 1040 |
PM 23 High Speed Steel Thermal Treatments
1920-2160°F (1050-1180°C) according to the desired final hardness.
The tool should be protected against decarburization and oxidation during hardening.
Martempering bath or fluidized bed at approx. 1020°F (550°C).
Forced air/gas.
Quenching should be continued until the temperature of the tool reaches approx. 120°F (50°C). The tool should then be tempered immediately.
For applications where maximum toughness is required use a martempering bath or afurnace with sufficient overpressure.
For cold work applications tempering should always be carried out at 1040°F (560°C) irrespective of the austenitizing temperature. Temper three times for one hour at full temperature. The tool should be cooled to room temperature between the tempers. The retained austenite content will be less than 1% after this tempering cycle.
Heat at a rate not exceeding 400°F per hour (222°C per hour) to 1600°F (871°C), and hold at temperature for 1 hour per inch (25.4 mm) of thickness, 2 hours minimum. Then cool slowly with the furnace at a rate not exceeding 30°F per hour (17°C per hour) to 1000°F (538°C). Continue cooling to ambient temperature in the furnace or in air.