DH2F
A modified H13 mould steel, pre-hardened to 37-41 HRC with exceptional machinability
UNIQUE CHARACTERISTICS
- 38-42 HRc hardness
- Through hardened for exceptional dimensional stability.
- Cuts mold making costs by reducing man hours required for machining. Classified as a “free-machining” steel.
- Ideal for complex, precision molds and parts susceptible to distortion and/or deformation without needing additional heat-treating.
- Ideal for Ion-nitriding.
APPLICATIONS
- Molds for plastics
- Diecast die components
- Plunger tips, sprue bushings
- Diecasting dies for aluminum and zinc
- Dies for aluminum extrusions
- Press dies
- Dieplate strippers
- Machine parts
BENEFITS
Machining
DH2F has a machine rating of 65 out of 100, with 100 being the best rating for
pre-hardened mold steels. (For comparison, P20 at 30 HRc has a machine rating of 50.)
DH2F’s superior machinability means extended tool life.
A positive rake cutter with a concave face and chip breaking edge works best.
Example of tool life of face milling cutter
Example of tool life of HSS drill bit
Cutting Parameters
Chip Shape
DH2F (modified H-13, pre-hardened)
H-13
Surface Testing
Surface treating gives DH2F enhanced abrasion and corrosion resistance.
Abrasion Resistance
Erosion Resistance
Erosion testing: An annealed .591" dia. x .787" sample is weighed before and after soaking in an aluminum bath at 1,292°F for 30 hours.
Polishing
DH2F is a resulfurised steel and sulfur can affect polishing. We recommend contacting International Mold Steel if you are considering SPI #2 or better polish.
Welding
The same filler material that is used for typical H13 is recommended for DH2F.
- Pre-heat temperature: 575-650°F
- Post-heat temperature: 750-1000°F
Note: Double tempering or drawing is recommended after welding. This procedure, sometimes known as color matching, should be done at 1070-1120°F
Heating should never exceed 1160°F, or material softening and dimensional distortion will take place.
Mechanical Properties
Physical Properties
Average coefficient of Thermal Expansion for DH2F and H-13
Microstructure
Hardening: 1886°F, air-cooling
Tempering: 1166°F x 1 hr.
Hardness: 40 HRc
Tempering/Hardness Curve
The material, as delivered, does not require heat-treating. This data is presented merely for reference
Chemical Composition
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