D7Download D7 Spec sheet
WM D-7 is a high carbon-high chromium die steel with added carbon and vanadium for unexcelled abrasion resisting qualities. It was developed especially for applications involving extreme abrasive wear. It approaches the powder metal 10V wear properties at less than half the cost.
To hold size change to an absolute minimum, hold as close to 1900°F hardening temperature as possible. When pack hardened, hold the container at temperature for minimum time of one hour per inch of thickness to allow for proper carbide solution. With atmosphere furnace or salt bath hardening, soak at temperature for a minimum section should be soaked for an additional period of 15 minutes per inch.
Quench the pieces in still air. Extremely heavy sections may require an oil quench to develop maximum hardness. If an oil quench is used, flash quench into oil until the piece loses color, then complete the quench in air. Temper as soon as the pieces have cooled to room temperature.
If the 1875-1925°F range was used for hardening, temper in the 350-400°F range for most applications or in the 950-975°F secondary hardness range for semi-hot work applications. Double tempering of large section sizes is recommended.