Chemical Composition :
| C |
Mn |
Si |
S |
P |
Cr |
| 2.0-2.30 |
.60 |
.60 |
.03 |
.03 |
11.0-13.50 |
Fabrication and Heat Treatment Heat Treatment :
D3 tool steel requires hardening and tempering to achieve maximum
properties. For maximum accuracy, the parts of D3 tool steel should be
stress relieved after roughing operations. Stress should be relieved at 648°C
(1200°F) for one hour and cooled slowly.
Annealing : Annealing of D3 tool steel needs to be done in a
controlled atmosphere furnace. D3 tool steels should be heated thoroughly to
871°C (1600°F) and cooled slowly at a rate of notmore than 6°C
(20°F) per hour, until the furnace is black. Then the material should
be removed and air cooled.
Tempering : The D3 tool steel should be cooled to room temperature
and should be tempered immediately. The parts should be placed in the
tempering furnace and increased slowly tothe desired tempering temperature.
Tempering for 1 hour per inch of thickness is required.
Hardening : D3 tool steel should be heated properly since it is very
sensitive to overheating and if not heated maximum hardness cannot be
achieved. The work should be directly placed in afurnace preheated to 954°C
(1750°F) and soaked for 2025minutes, plus 5 minutes per inch of
thickness, and then oil quenched to harden it.
Additional Information : Item Code: D-3
