A11 PMDownload A11 PM Spec sheet
WM A-11 powder metal (A11 PM) tool steel is a versatile tool and die steel which provides extremely high wear resistance in combination with relatively high impact toughness. A large volume of hard vanadium carbides provides the high wear resistance. The good impact toughness is a result of the fine grain size, small carbides, and superior cleanliness of the powder metallurgy (PM) microstructure. WM A-11 offers substantially better wear resistance than the high-carbon, high-chromium die steels such as D2 and D7.
Density – 0.268 lb/in3
Specific gravity – 7.41
Coefficient of Thermal Expansion
|70 – 200°F||5.96 x 10-6 in/in/°F|
|70 – 500°F||6.18|
|70 – 800°F||6.54|
|70 – 1100°F||6.82|
For Optimum Wear Resistance:
Soak for 5 to 15 minutes.
Furnace or Salt Bath: 2150°F
For Balance of Wear Resistance and Toughness:
Soak for 15 to 30 minutes.
Furnace or Salt Bath: 2050°F
For Maximum Toughness and minimum distortion in cooling:
Soak for 30 to 60 minutes.
Salt Bath: 1950°F
For pressurized gas, the furnace should have a minimum quench pressure of 4 bars. The quench rate to below 1000°F is critical to obtain the desired properties.
For oil, quench until black, about 900°F then cool in still air to 150-125°F.
For salt maintained at 1000-1100°F equalize in the salt, then cool in still air to 150-125°F.
The typical tempering range is 1000-1100°F. Do not temper below 1000°F. Hold at temperature for 2 hours then air cool to ambient temperature. Double tempering is required. Triple tempering is required when austenitized at 2100°F.
Heat at a rate not exceeding 400°F per hour to 1600-1650°F, and hold at temperature for 1 hour per inch of maximum thickness; 2 hours minimum. Then cool slowly with the furnace at a rate not exceeding 30°F per hour to 1000°F. Continue cooling to ambient temperature in the furnace or in air. The resultant hardness should be a maximum of 277 HBW.