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PM A-11 Powder Metal Products
POWDER METAL A11
AISI A11 - 10% VANADIUM
ANALYSIS
C |
MN |
SI |
CR |
MO |
V |
2.45 |
0.50 |
0.90 |
5.25 |
1.35 |
9.80 |
SIZE AVAILABILITY
Flats - Rounds - Squares - Hollowbar
Standard Sizes - Non-Standard Sizes - Metric Sizes
PM A11 (AISI A11) powder metal tool steel a versatile air hardening tool and die steel which provides extremely high wear resistance in combination with relatively high impact toughness. A very large volume of hard vanadium carbides provides the high wear resistance. The good impact toughness is the result of the fine grain size, small carbides, and superior cleanliness of the powder metallurgy (PM) microstructure. PM All (AISI Al 1) offers substantially better wear resistance than the high carbon, high chromium die steels such as D2 and D7.
Machinability: 35-40% of a 1 % carbon steel
PM A11 HEAT TREATING INSRUCTIONS
Hardening
Preheating: 1500-1550°F, equalize.
Critical Temperature: Acl: 1540°F
Austenitizing (High Heat): Heat rapidly from the preheat, typically by transferring to a second furnace.
For Optimum Wear Resistance: Soak for 5 to 15 minutes; Furnace or Salt Bath: 2150°F;
For Balance of Wear Resistance & Toughness: Soak for 15 to 30 minutes; Furnace or Salt Bath: 2050°F
For Maximum Toughness & Minimum Distortion in Cooling: Soak for 30 to 60 minutes; Furnace: 1975°F; Salt Bath: 1950°F
Quenching: Air pressurized gas warm oil or salt. Sections less than 3" thick may be air cooled to maximum hardness. Sections 3" thick or more must be quenched at a faster rate using one of the methods below to attain maximum hardness.
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.
As Oil Quenched from |
HRC |
1950°F, 45 minutes |
65 |
2050°F, 20 minutes |
65 |
2100°F, 15 minutes |
64 |
2150°F, 5 minutes |
63 |
Tempering:Temper immediately after quenching. Typical temperature 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 or higher.
Oil Quenched from 1950°F, 45 minutes |
|
Tempering Temp °F |
HRC |
1000 |
60 |
1050 |
56.5 |
1100 |
51 |
1150 |
46 |
1200 |
|
|
Oil Quenched from 2050°F 20 minutes |
|
Tempering Temp °F |
HRC |
1000 |
63 |
1050 |
60 |
1100 |
55 |
1150 |
50 |
1200 |
45 |
|
| |
|
Oil Quenched from 2150°F 5 minutes |
|
Tempering Temp °F |
HRC |
1000 |
64 |
1050 |
61 |
1100 |
56 |
1150 |
51 |
1200 |
46 |
|
Annealing
Annealing must be performed after hot working and before re-hardening. Heat at a rate not exceeding 400°F per hour to 16001650°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 50°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 HB.
The data presented herein are typical values and do not warrant suitability for any specific application or use of this material. Normal variations in the chemical composition, the size of the product, and heat treatment parameters may result in different values for the various physical and mechanical properties .
Data is typical and should not be construed as actual values for any catagory.
Applications and technical information require engineers and tool designers to exercise independent judgement. |