SPECIAL C is a highly-alloyed die steel intended for use in the most severe applications, where very high compressive strength and resistance to softening, cracking, and abrasion is desired.
A.I.S.I.-S.A.E. Tool Steel Type-None
Composite Forgings Ltd. SPECIAL C is furnished to the Tool and Die Steel trade in the prehardened condition and in the annealed condition.
| Press Dies | Hammer Dies |
| HERF Dies | Insert Dies |
| Upsetter Dies | Extrusion Dies |
| Other Extrusion Tooling |
Note: SPECIAL C Die Blocks are furnished prehardened and tempered in commercially machinable ranges of hardness, ready to use after machining of the impression and offered in three standard hardness ranges:
AA Hardness -Rc 45/49
A Hardness - Rc 41/45
B Hardness - Rc 36/40
SPECIAL C ANNEALED is furnished in the annealed condition for subsequent hardening by the customer to some hardness greater than the commercially machinable hardness ranges offered in SPECIAL C.
It is recommended that "SPECIAL C" and "SPECIAL C" ANNEALED be annealed as follows:
Heat slowly to 1300°F.
Hold at temperature until heated through.
Slow furnace cool to 500°'F.
Reheat to 1220°F. Hold at temperature 2 hours per inch of cross section.
Furnace cool to 1180°F. Hold at 1180°F for 2 hours per inch of cross section
Furnace cool to 500°F.
Note: SPECIAL C should always be annealed before rehardening.