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Technical
Information for O-6 Tool Steel
 | O-6 is an oil-hardening steel
with very good nondeforming properties, toughness, and wear resistance. typical analysis
is shown in the chart below:
|
| Carbon |
Manganese |
Phosphorus |
Sulphur |
Silicon |
Chromium |
Molybdenum |
| 1.25% - 1.55% |
0.30% - 1.10% |
0.3% Maximum |
0.3% Maximum |
0.55% - 1.50% |
.30% Maximum |
0.20% - 0.30% |
| O-6 is used primarily in stamping and cold forming of parts.
The steel contains free graphite, which gives excellent lubricity. Hard carbides in
conjunction with the free graphite provides excellent wear resistance. Typical
applications include:
 | Punches |
| Dies |
| Trim Dies |
| Blanking Dies |
| Forming Dies |
| Stamping Dies |
| Metal-to-metal wear parts |
|
| Heat Treatment
| Forging:
 | Preheat Steel to 1300°F. |
| Increase furnace temperature to 2000°F |
| Do NOT forge below 1700°F |
| Cool slowly. Do not normalize. |
|
| Annealing:
| Heat to 1450°F, hold steel for 2 hours. |
| Cool slowly in furnace at a rate of 50°F/hour
to 1100°F. |
| Air cool. Brinell hardness approximately 217. |
|
| Hardening:
| Preheat steel to 1250°F, soak thoroughly. |
| Increase furnace temperature to 1450°F -
1500°F, hold one hour/inch thickness. |
| Oil quench to 150°F, temper immediately. |
|
|
| Tempering:
| Temper between 350°/450°F for 2 hours (pieces
over 2", temper 1 hour per inch/thickness). |
|
| Tempering Temperature, °F |
Hardness, Rockwell C |
| As Hardened |
64-66 |
| 250 |
63-65 |
| 300 |
62-64 |
| 350 |
61-63 |
| 400 |
60-62 |
| 450 |
59-61 |
| 500 |
58-60 |
| 600 |
57-59 |
(Test pieces were oil quenched from 1475°F,
tempered 2 hours)
| Machinability:
| O-6 has a machinablility rating between 55% -
65% of annealed 1.00% carbon tool steel based on average cutting speeds for turning,
boring, drilling,slab milling and end turning. |
|
| Weldability:
| Preheat temperature: |
| Annealed...300/500°F |
| Hardened...275/400°F |
| Postheat Temperature |
| Annealed... Reanneal |
| Hardened...350/450°F |
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For More Information
please call or fax us at 800-654-2901 (fax) 860-684-6354
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