D2 Steel – Product Description
D2 is a high carbon – high chromium air hardening tool steel, heat treatable to 60-62 Rc. D2 offers excellent wear and abrasion resistance, due to large volumes of carbides in the microstructure. D2 is widely used in long production cold work applications requiring very high wear resistance and high compression strength. It is machinable in the annealed condition, and, like other air hardening tool steels, exhibits minimal distortion in heat treat. D2 is available in de-carb free rounds, flats, and squares, as well as ground flat stock and drill rod.
APPLICATIONS
Typical applications for D2 tool steel are blanking, forming, and trim dies, gages, slitting cutters, wear parts, lamination dies, thread rolling dies, drawing dies, rotary cutting dies, knurls, bending dies, gages, shear blades, burnishing tools, rolls, machine parts, master parts, injection screw and tip components, seaming rolls, extrusion dies, tire shredders, scrap choppers, etc
Benefits
If you need better machinability then consider A2 tool steel which has a chromium content of 5% and is more readily machinable.
Typical applications for D2 Steel:
- Stamping or Forming Dies
- Punches
- Forming Rolls
- Knives, slitters, shear blades
- Tools
- Scrap choppers
- Tyre shredders
Typical chemical composition of AISI D2 Steel |
||||
|---|---|---|---|---|
|
C |
SI |
Cr |
Mo |
V |
| 1.50% | 0.30% | 12.00% | 0.80% | 0.90% |
Forging:
Heat slowly and uniformly to 700°C then more rapidly to 900/1040°C. Do not continue to forge D2 below 925°C. Reheat as often as necessary to maintain proper forging temperature. After forging cool slowly. This is not an annealing process. After the forging is cold, it must be annealed as described below.
Annealing:
Heat uniformly to 843/871°C, then slow furnace cool at a rate of not more than 10°C per hour. After annealing D2 a maximum hardness of 240 Brinell may be achieved
Hardening:
D2 tool steel is extremely sensitive to overheating during hardening – do not overheat.
Pre heat slowly to 750/780°C and soak. Continue heating to the final hardening temperature of 1000/1030°C and allow the component to equalise. Quench in oil or cool in air.
Tempering:
Heat uniformly and thoroughly to the desired temperature and hold for 25 minutes per cm of thickness. D2 can be double tempering at approximately 15°C below the first tempering, after intermediate cooling to room temperature.
Tempering D2 Steel |
||||||
|---|---|---|---|---|---|---|
| Tempering °C |
150 |
200 |
250 |
300 |
350 |
400 |
| HRC |
62/61 |
61/60 |
60/59 |
57/56 |
56/55 |
56/55 |
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