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L-6
Chemical
Analysis: |
|
|
Tempering Temp.
º(F) |
Hardness Rc |
|
Carbon
|
.65/.75
|
|
As-quenched |
65.0 |
| Manganese |
.25/.80 |
|
300 |
62.0 |
| Phosphorus |
.030
Max. |
|
400 |
61.0 |
| Sulfur |
.030
Max. |
|
500 |
58.0 |
| Silicon |
.50 Max. |
|
600 |
56.0 |
| Chromium |
.60/1.20 |
|
700 |
53.0 |
| Vanadium |
------- |
|
800 |
50.0 |
| Tungsten |
------- |
|
900 |
48.0 |
| Molybdenum |
.50 Max. |
|
1000 |
46.0 |
| Nickel |
1.25/2.00 |
|
|
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Uses:
Form rolls, stamping dies, forming dies, shear blades,
punches, trimmer dies, pawls, knuckle pins, spindles, clutch pins.
Forging/Rolling:
Heat slowly and uniformly to a temperature of from 2100° F - 2175° F. Do
not forge or roll below 1700° F,
cool slowly from the forging or rolling temperature. Do not normalize.
Annealing:
Heat slowly to 1400° F,
and hold for 1 hour per inch of thickness. Furnace cool at 20°
F per hour to 900° F; air
cool to room temperature. Expected Brinell hardness 217 max.
Hardening:
Preheat to 1200° F
- 1400° F depending on the section size soak until
uniformly heated, and either transfer or raise furnace temperature to
1500° F - 1550° F, and hold
1 hour per inch of greatest thickness. Quench into 150°
F oil.
Tempering:
Temper immediately after quenching, before part has
cooled to below 150° F. Parts should be held a minimum of
2 hours per inch of greatest thickness. A single temper is sufficient,
but double tempering is a good insurance policy. For most applications
the tempering temperature of 400° F is recommended, but since L-6 does not become
brittle like other steels, when tempered in 450°
F - 800° F range, it may be tempered at a higher temperature
where greater toughness is required. The above tempering table
may be used as a guide. However, since 1/2" dia. specimens
were used for this test, it may be found that heavier sections are several
points lower.
© Copyright 1999 Diamond Metals Corporation.
All Rights Reserved.
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