DH2F Steel

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.


  • 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



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

DH2F Machinability

Example of tool life of HSS drill bit


DH2F MachinabilityA

Cutting Parameters

DH2F Chart

Chip Shape

DH2F (modified H-13, pre-hardened)


Surface Testing

Ion-Nitridingof DH2F
Surface treating gives DH2F enhanced abrasion and corrosion resistance.

Abrasion Resistance

DH2F Abrasion Test


Erosion Resistance

DH2F_Erosion Chart1

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.


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.


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

DH2F Mechanical Properties


Physical Properties

Average coefficient of Thermal Expansion for DH2F and H-13


DH2F Micro Structure
Hardening: 1886°F, air-cooling
Tempering: 1166°F x 1 hr.
Hardness: 40 HRc

Tempering/Hardness Curve

DH2F Tempering-HCurve
The material, as delivered, does not require heat-treating. This data is presented merely for reference

Chemical Composition


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