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DeCarb
Free Tool Steel Bar
AISI
S-7
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Description
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AISI
S-7 is a general purpose air-hardening tool steel with high impact
and shock resistance. It has good resistance to softening at moderately
high temperatures. This combination of properties makes it suitable
for many hot work and cold work applications. Excellent combination
of high strength and toughness. Useful in moderate hot work as well
as cold work work tooling. Added size stability when air hardened.
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| Typical
Applications |
- Bull
Riviters
- Concrete
Breakers (Moll Points)
- Riveting
Dies
- Powder
Metal Dies
- Notching
Dies
- Dowels
- Drills
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- Drill
Plates
- Hubs
- Plastic
Mold Dies
- Cold
Forming Dies
- Blanking
Dies
-
Bending Dies
- Master
Hobs
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| Chemical
Composition |
- Carbon:
.45 / .55
- Manganese:
.20 / .80
- Silicon:
.20 / 1.00
- Tungsten:
- Molybdenum:
1.30 / 1.80
- Chromium:
3.00 / 3.50
- Vanadium:
.30 max.
- Cobalt:
--
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| Heat
Treatment Data |
- Forging:
(note
a)
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Start forging at: 1800-1950°F (982-1066°C)
- Do
not forge below: 1550°F (843°C)
- Normalizing:
(note
b)
- Annealing:
(note
c)
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Temperature: 1400-1450°F (760-788°C)
- Rate
of cooling, max. per hour: 40°F (22°C)
- Typical
annealed hardness, Brinell: 183-212
- Hardening:
- Rate
of heating: Slowly
- Preheat
temperature: 1200°F (649°C)
- Hardening
temperature: 1450-1500°F (788-816°C)
- Time
at temperature, minutes: 10-30
- Quenching
medium: O (note
i)
- Tempering:
- Tempering
temperature 350-500°F (177-260°C)
- Approx.
tempered hardness, Rockwell C: 57-62
- Wear
Resistance: Medium
- Toughness:
Medium
- Resistance
to Softening Effect of Elevated Temperature:
Low
- Depth
of Hardening: Medium
- Machinability:
High
- Grindability:
High
- Distortion
in Heat Treating: Low
- Safety
in Hardening: Medium to High
- Resistance
to Decarburization: High
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