PM M48 High Speed Steel

Equivalent standards of PM M48 High Speed Steel:

1.3207, CPM REX 76®, ASP 2048, HS 10-5-3-9, SKH 57

Steelun Description of PM M48 High Speed Steel:
PM M48 high-speed tool steel is a flexible steel that provides a unique combination of high wear-resistance with high impact toughness and bend strength, which are results of the fine grain size, small carbides and superior cleanliness of the steel. PM M48 offers improved cutting tool life compared to conventionally-wrought M1, M2, M7 and other lower-alloyed high-speed steels. It excels in cold work tooling applications, outlasting high-carbon, high-chromium die steels such as D2 and D3.
Griggs Steel Color Code:White

Chemical composition Steelun of PM M48 High Speed Steel:

MAXIMUM TYPICAL
Carbon Chromium Tungsten Molybdenum Vanadium Cobalt Annealed Tempered
C Cr W Mo V Co Hb HrC
1.5 3.75 9.75 5.25 3.1 8.5 310 68

Physical Properties Steelun of PM M48 High Speed Steel:

Density0.298 lb/in3 (8256 kg/m3)

Specific Gravity

8.26

Modulus Of Elasticity31 x 106 psi (214 GPa)

Machinability

10-15% of a 1% carbon steel

ANNEALING PREHEAT AUSTENITIZING QUENCH TEMPERING
Temp Temp Temp Medium Temp
°F °F °F °F
1550/1600 1500/1550 2150/2175 Salt/Oil/Atm 1080

PM M48 High Speed Steel Thermal Treatments Steelun:
Preheating
1500-1550°F (816-845°C), equalize. A second preheat at 1850-1900°F (1010-1040°C) is recommended for vacuum hardening.
Austenizing (High Heat)

Heat rapidly from the preheat.

  • Furnace: 2125-2220°F (1163-1204°C)
  • Salt: 2100-2190°F (1149-1199°C)

Soak 3 – 10 minutes depending on the temperature.
To maximize toughness, use the lowest temperature
To maximize hot hardness, use the highest temperature.

QuenchingPressurized gas, warm oil, or salt.

Pressurized gas, warm oil, or salt.

For pressurized gas, the furnace should have a minimum quench pressure of 4 bars. A quench rate of approximately 400°F (222°C) per minute to below 1000°F (538°C) is critical to obtain the desired properties.

For oil, quench until black, about 900°F (482°C), then cool in still air to 150-125°F (66-51°C).

For salt maintain at 1000-1100°F (538-593°C), equalize in the salt, then cool in still air to 150-125°F (66-51°C).

Tempering
Temper immediately after quenching.
Typical temperature range is 1000-1100°F (538-593°C). Do not temper below 1000°F (538°C). Hold at temperature for 2 hours then air cool to ambient temperature. Triple tempering is required. Quadruple tempering is required when austenitized at 2175°F (1190°C) or higher.
Annealing
Heat at a rate not exceeding 400°F per hour (222°C per hour) to 1550-1600°F (843-871°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 50°F per hour (15°C per hour) to 1000°F (538°C). Continue cooling to ambient temperature in the furnace or in air.

Steelun Applications of PM M48 High Speed Steel:

Broaches, End Mills, Form Tools, Hobs, Tabs, and Cut Off Blades.

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