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Eastern
Tool
Steel Service, Inc.
1045 Delaum Rd.
P.O.
Box 857
St.
Marys, Pa 15857
Phone:
(814) 834-7224
Fax:
(814) 834-7225
Or
Contact Us
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A-11 PM Data Sheet
A-11 PM is designed with a air hardening base analysis with added high carbon and vanadium for exceptionally good wear resistance, toughness and strength for cold tooling applications.
The exceptional wear resistance and good toughness of A-11 PM make it an excellent candidate to replace carbide and other highly wear resistant materials in cold work tooling applications, particularly where cost effectiveness can be demonstrated.
Chemical Composition
| Carbon | 2.45% |
| Manganese | 0.50% |
| Chromium | 5.25% |
| Molybdenum | 1.30% |
| Vanadium | 9.75% |
| Silicon | 0.90% |
| Sulfur | 0.07% |
Typical Applications
| Blanking Dies | Cold Extrusion Dies |
| Forming Dies | Trim Dies |
| Nozzles and Screw Tips | Shear Blades |
| Plastic Injection Molding | Wear Inserts |
| Powder Compaction Dies and Pins |
Thermal Treatments
Preheat : 1500/1550F (820/845C), equalize, Second preheating stage at 1800/1850F (1010/1040C)recommended for vacuum or atmosphere hardening. equalize.
Austenize : 1850/2150F (1010/1175C), 30/45 minutes at temperature. Standard recommendation to achieve RC 60-62 after tempering is to use 2050F (1120C)
Quench : Salt, oil or atmosphere quench to 1000-1100F(540-595C), equalize, then air cool to below 125F(50C) or hand warm. Vacuum or atmosphere quench rate through 1850-1300F(1010-705C) range is critical to achieve optimum heat treat results.
Temper : 1000F (540C) minimum, hold 2 hours at temperature, air cool. Temper twice minimum. Triple tempering is recommended if austenizing at 2000F (1095C)
Cryogenic Treating : Refrigeration treatments may improve long term dimensional stability by transforming retained austenite. Refrigeration treatments should generally be performed after the first temper, and must be followed by a temper.
Hardening Data
|
Temperature
|
1850F
|
1900F
|
1950F
|
2050F
|
2100F
|
2150F
|
|
°C
|
°F
|
(1025C)
|
(1040C)
|
(1065C)
|
(1120C)
|
(1150C)
|
(1175C)
|
|
|
As Quenched
|
61
|
63
|
65
|
65
|
64.5
|
63.5
|
|
540
|
1000
|
56
|
57
|
60.5
|
62
|
63
|
64
|
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OPTIMUM FOR MAXIMUM TOUGHNESS AND EFFECTIVE STRESS-RELIEVING.
|
|
550
|
1025
|
54
|
56
|
58.5
|
60
|
62
|
63
|
|
565
|
1050
|
52
|
54
|
56.5
|
58
|
60
|
61
|
|
595
|
1100
|
49
|
51
|
52
|
54
|
55
|
56
|
|
620
|
1150
|
44
|
45
|
46
|
48
|
50
|
51
|
|
650
|
1200
|
40
|
41
|
43
|
46
|
47
|
48
|
|
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NOTE A:
|
RESULTS MAY VARY WITH HARDENING METHOD AND SECTION SIZE. SALT OR OIL
QUENCHING WILL GIVE MAXIMUM RESPONSE. VACUUM OR ATMOSPHERE COOLING MAY
RESULT IN UP TO 1-2 HRC POINTS LOWER. |
MINIMUM TIME AT
AUST TEMP (MINS)
|
60
|
45
|
30
|
20
|
15
|
10
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MINIMUM NUMBER
OF TEMPERS (2 HRS)
|
2
|
2
|
2
|
2
|
3
|
3
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Surface Treatments
A-11 can be nitrided, steam tempered or titanium-nitride coated if desired. If the CVD TiN treatment is used, care is required in vacuum hardening.
Annealing
Heat to 1600F (870C), hold 2 hours, slow cool 30F (15C)/hour maximum) to 1000F (540C), air cool.
Typical annealed hardness: 255/277 BHN.
Stress Relieving
Annealed Material: Heat to 1100/1300F(595/740C), hold two hours, cool in still air.
Hardened Material: Heat to 25F(15C) below original tempering temperature, hold two hours, cool in still air.
Welding
Welding of A-11 is generally not recommended due to the fine-grain microstructure produced by the PM process. If weld repair must be performed, use air hardening tool steel filler material.
Annealed Material:Preheat 1000/1100F(540/595C), maintain over 1000F(540C) during welding. Reanneal or temper 1550F(845C) 6 hours after welding.
Hardened Material: Preheat to 25F(15C) below original tempering temperature (1000F(540C) minimum). Maintain above 900F(480C) during welding. Cool to 150F(65C) after welding. Temper 25F(15C) below original tempering temperature. Minimum 1000F(540C)
Physical Properties
| Modulus of Elasticity | 32psix10(6) | (221 GPa) |
| Density | 0.268 lb/in3 | (7695 kg/M3) |
| Thermal Conductivity | 15 BTU/hr./ft./F | 26 W/m/ °K) |
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