PM 60 High Speed Steel

Equivalent standards of PM 60 High Speed Steel:

ASP 2060, HS 6-7-6-10

Steelun Description of PM 60 High Speed Steel:
PM 60 high-speed tool steel is a high-alloyed PM high-speed steel suitable for very demanding cold work applications and for cutting tools. The high carbon and alloying content, Co, Mo, W and V, gives an extremely high-compressive strength combined with a very suitable abrasive wear-resistance. For cutting tool applications PM 60 offers a unique combination of red hardness and strong toughness compared to all other high-speed steels that other materials don’t have. In times of high-carbon tool steel scrap, PM 60 is the best alternative.
Griggs Steel Color Code:Orange

Chemical composition Steelun of PM 60 High Speed Steel:

MAXIMUM TYPICAL
Carbon Chromium Tungsten Molybdenum Vanadium Cobalt Annealed Tempered
C Cr W Mo V Co Hb HrC
2.3 4.2 6.5 7 6.5 10.5 340 67

Physical Properties Steelun of PM 60 High Speed Steel:

Density

0.286 lb/in3 (7960 kg/m3)

Modulus Of Elasticity

36 x 106 psi (250 GPa)

PM 60 High Speed Steel Thermal Treatments

ANNEALING PREHEAT AUSTENITIZING QUENCH TEMPERING
Temp Temp Temp Medium Temp
°F °F °F °F
1575/1625 1500/1550 2125/2175 Salt/Oil/Atm 1040

PM 60 High Speed Steel Thermal Treatments Steelun:
Preheating
840-930°F (450-500°C) and 1560-1650°F (850-900°C).
Austenizing (High Heat)

Heat rapidly from the preheat, typically by transferring to a second furnace.

2000-2150°F (1100-1180°C) according to the desired final hardness.

The tool should be protected against decarburization and oxidation during hardening.

Quenching

Vacuum furnace with high speed gas at sufficient overpressure (2–5 bar).

Martempering bath or fluidized bed at approx. 1004°F (540°C).

Quenching should be continued until the temperature of the tool reaches approx. 77°F (25°C). The tool should then be tempered immediately.
In order to obtain a high toughness, the cooling speed in the core should be at least 20°F/sec. (10°C/sec.). This is valid for cooling from the austenitizing temperature down to approx. 1004°F (540°C). After temperature equalization between the surface and core, the cooling rate of approx. 10°F/sec. (5°C/sec.) can be used. The above cooling cycle results in less distortion and residual stresses.

Tempering
Temper immediately after quenching.

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.

Annealing
Annealing must be performed after hot working and before re-hardening.

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 20°F per hour (10°C per hour) to 1290°F (700°C). Continue cooling to ambient temperature in the furnace or in air.

Steelun Applications of PM 60 High Speed Steel:

Drills, Gear Cutters

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