S-7
Chemical
Analysis: |
|
|
Tempering Temp.
º(F) |
Hardness Rc |
|
Carbon
|
.45/.50
|
|
As-quenched |
60.0 |
| Manganese |
.20/.80 |
|
400 |
58.0 |
| Phosphorus |
.030
Max. |
|
500 |
56.0 |
| Sulfur |
.030
Max. |
|
600 |
55.0 |
| Silicon |
.20/1.00 |
|
700 |
54.0 |
| Chromium |
3.00/3.50 |
|
800 |
53.0 |
| Vanadium |
.35 Max. |
|
900 |
52.0 |
| Tungsten |
------- |
|
1000 |
51.0 |
| Molybdenum |
1.30/1.80 |
|
1100 |
47.0 |
| Cobalt |
------- |
|
1200 |
38.0 |
|
|
|
1300 |
31.0 |
Uses:
Punches, dies, plastic molds, chisels, gripper dies,
engraving dies, bending dies, shear blades, slitter knives, rivet sets.
Forging/Rolling:
Preheat to 1200° F
- 1300° F and soak thoroughly. Then raise to
2000° F
- 2050° F.
Do not forge or roll below 1700° F,
cool slowly from the forging or rolling temperature. Do not normalize.
Annealing:
Heat in the 1500° F
- 1550° F range, and hold for uniformity. Furnace
cool slowly to 1000° F and air cool.
Expected Brinell hardness 197 max.
Hardening:
Preheat to 1200° F
- 1300° F, soak until uniformly heated, and either
transfer or raise furnace temperature to 1725°
F, and hold 1 hour per inch of greatest thickness. Sections
2-1/2" or less should be quenched in still air to 150°
F. Section sizes 2-1/2" to 6" can be oil quenched
to black, but section sizes over 6" should not be full oil quenched..
Tempering:
Temper immediately after quenching, before parts have
cooled to below 150° F. Parts should always be held a minimum
of 2 hours per inch of greatest thickness. Double tempering is
recommended. For cold work and similar applications a tempering
temperature of 400° F - 500°
F is suggested and 900° F - 1000° F for hot work
applications. 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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