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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-2 Tool Steel Data Sheet
AISI A-2 is an air-hardening medium alloy tool steel
which is heat treatable to HRC 60-62. It has wear resistance
intermediate between the oil hardening tool steels and the high carbon chromium tool steels. Because it offers a combination of good toughness along with moderate wear resistance, it has been widely used for many years in variety of cold work applications.
A-2 is quite easily machined in the annealed condition and exhibits minimal distortion on hardening, making it an excellent choice for dies of complicated design.
Chemical Composition
| Carbon | 1.00% |
| Manganese | 0.85% |
| Chromium | 5.25% |
| Molybdenum | 1.10% |
| Vanadium | 0.25% |
Typical Applications
| Blanking Dies | Thread Roll Dies |
| Forming Dies | Trim Dies |
| Punches | Shear Blades |
| Guages | Wear Inserts |
| Powder Compaction Punches |
Thermal Treatments
Preheat : 1100/1250F (595/675C), equalize, 1350/1450F (775/790C), equalize.
Austenize : 1750/1800F (995/895C), 30/45 minutes at temperature.
Quench : Air, positive pressure vacuum to 150F (65C).
Temper : 400/1000F (205/540C), hold 2 hours at temperature, air cool. Temper twice.
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.
Hardness and Impact Toughness Data
Air cooled from 1775F(970C)
| Tempering |
|
|
Toughness |
| Temperature | | Hardness | Charpy C-Notch |
| Deg. F | Deg. C | HRC | Ft. Lbs. | Joules |
| As quenched | | 64 | - | – |
| 300 | 150 | 62 | - | – |
| 400 | 205 | 61 | 31 | 42 |
| 500 | 260 | 60 | 41 | 56 |
| 600 | 315 | 59 | 37 | 50 |
| 700 | 379 | 58 | 33 | 45 |
| 800 | 425 | 58 | 31 | 42 |
| 900 | 480 | 58 | 29 | 39 |
| 1000 | 540 | 57 | 41 | 56 |
| 1100 | 595 | 51 | - | – |
Surface Treatments
A-2 can be given standard surface treatments such as nitriding, titanium nitride coating, or hard chrome plating if desired. When gas nitriding, harden from the high side of the temperature range and single temper at 1000F (540C); then use standard nitriding procedures.
Annealing
A. Heat to 1600F (870C), hold 2 hours, slow cool 50F (30C)/hour maximum) to 1200F (650C), air cool.
OR
B. Heat to 1600F (870C), hold 2 hours, cool to 1400F (760C), hold 6 hours, air cool.
Typical annealed hardness: 197/241 BHN.
Stress Relieving
Annealed Material: Heat to 1200/1250F(650/675C), 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
Use air hardening tool steel filler material.
Annealed Material:Preheat to 400/600F(205/315C). Maintain above 400F(205C) during welding. Reanneal or temper 1400F(760C) 6 hours.
Hardened Material: Preheat to 25F(15C) below original tempering temperature (300F(150C) minimum). Maintain above 300F(150C) during welding. Cool to 150F(65C) after welding. Temper 25F(15C) below original tempering temperature.
Physical Propoerties
|
Modulus of Elasticity| 30psix10(6) | (207 GPa) |
| Density | 0.284 lb/in3 | (7861 kg/M3) |
| Thermal Conductivity | 15 BTU/hr./ft./F | 26 W/m/ °K) |
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