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DeCarb
Free Tool Steel Bar
AISI
A-2
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Description
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An
air-hardening tool steel containing five percent chromium. Replaces
the oil hardening (0-1 type) when safer hardening, less distortion
and increased wear-resistance are required. Provides an intermediate
grade between the oil hardening and the high carbon, high chromium
(D-2) types.
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| Typical
Applications |
- Blanking
Dies
- Thread
Roller Dies
- Long
Punches
- Rolls
- Master
Hubs
- Trimming
Dies
- Forming
Dies
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- Precision
Tools
- Gauges
- Coining
Dies
- Extrusion
Dies
- Mandrels
- Shear
Blades
- Slitters
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| Chemical
Composition |
- Carbon:
.95 / 1.05
- Manganese:
1.00 max.
- Silicon:
.50 max.
- Tungsten:
--
- Molybdenum:
.90 / 1.40
- Chromium:
4.75 / 5.50
- Vanadium:
.15 / .50
- Nickel:
.30 max.
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| Heat
Treatment Data |
- Forging:
(note
a)
-
Start forging at: 1850-2000°F (1010-1093°C)
- Do
not forge below: 1650°F (899°C)
- Normalizing:
(note
b)
- Annealing:
(note
c)
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Temperature: 1550-1600°F (843-871°C)
- Rate
of cooling, max. per hour: 40°F (22°C)
- Typical
annealed hardness, Brinell: 201-235
- Hardening:
- Rate
of heating: Slowly
- Preheat
temperature: 1450°F (788°C)
- Hardening
temperature: 1700-1800°F (927-962°C)
- Time
at temperature, minutes: 20-45 (note
j)
- Quenching
medium: A (note
i)
- Tempering:
- Tempering
temperature: 350-1000°F (177-538°C)
- Approx.
tempered hardness, Rockwell C: 57-62
- Wear
Resistance: High
- Toughness:
Medium
- Resistance
to Softening Effect of Elevated Temperature:
Medium
to high
- Depth
of Hardening: Deep
- Machinability:
Medium
- Grindability:
Medium
- Distortion
in Heat Treating: Lowest
- Safety
in Hardening: Highest
- Resistance
to Decarburization: Medium
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