D2KNL
D2KNL is a modified version of D2 tool steel with better wear resistance and toughness. D2KNL has a Vickers hardness of 748, an Izod impact unnotched of 77.0 J, a Poisson’s ratio of 0.27-0.30, and an elastic modulus of 190-210 GPa.
APPLICATIONS
Form Supplied
Available surface conditions : hot rolled, ground, peeled, turned, drawn, cold rolled
HEAT TREATMENT
- Heat treatment: D2 steels should be preheated very slowly up to 815°C (1500°F), then temperature should be increased to 1009°C (1850°F) and held for 20 to 45 minutes. Then they are air quenched.
- Forging: Forging of D2 steels can be done at 1065°C (1950°F) down to 1750°F. Do not forge below 926°C (1700°F).
- Annealing: Annealing of D2 steels should be done at 886°C (1627°F) followed by slow furnace cooling at 4°C (40°F) per hour or less.
- Tempering: D2 steels can be tempered at 204°C (400°F) for achieving Rockwell C hardness of 61 and at 537°C (1000°F) for a Rockwell C hardness of 54
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Hardening
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Tempering
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PROCESSING
D2 can be worked as follows :
- Machining( grinding, turning, milling)
- Polishing
- Hot forming
- Electrical discharge machining
- Welding(special procedure incl. pre-heating & filler
materials of base material composition)
GRINDING
During Grinding, local heating of the surface, which can alter the temper, must be avoided. Grinding wheel manufacturers can provide advise on the choice of grinding wheels
SURFACE TREATMENT
The Steel Grade is a perfect substrate material for PVD coating. If nitriding is requested, a small diffusion zone is recommended but avoid compound and oxidized layers.
DELIVERY HARDNESS
- Typical soft annealed hardness is 220 HB
- Cold drawn and cold rolled material is typically 10-40 HB harder
Comparative Properties
