International Mold Steel

DH2F

DH2F is a modified H-13, prehardened 37-41 HRC.

Overview  

DH2F is a modified H-13, prehardened 37-41 HRC.

Applications include:

Plastic Molds

Zinc Diecasting Dies

Short Run Aluminum
Diecasting Dies

Plunger Tips &
Sprue Bushings

Die Plate Strippers

Dies for Aluminum
Extrusions

Patterns & Core Boxes

Others

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.

The benefits of DH2F Steel are its hardness and superior machinability. IMS has done extensive studies on DH2F and you can see
the data below.

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 Tool Life of Face Milling Cutter
Example of Tool Life of HSS Drill Bit
Cutting Parameters

Tool Material

Tool Shape

Cutting Fluid

Feed

Cut

Cutting Speed

Test Piece Size

Hardness

Tool LIfe End Point

Face Milling Cutter

M20

NP-100R

None

0.003″

0.059″

66-165

80″x50″x200″

40

V MAX=0.012″

Drill Bit

SKHS1

0.394” dia. tapered-shank drill a=118

None

0.004″

1.181″ deep hole

20-40

80″x50″x200″

40

Tool Erosion

Chip Shape
D2HF (Modified H-13, pre-hardened)
H-13
Cutting Parameters

Tool

SKH51 0.394” dia., tapered-shank drill a=118°

Feed

0.0039″/rev

Hole Depth

1.181″

Cutting Speed

25m/min

Test PIece Hardness

40 HRc

Test Piece Size

3.937″ x 7.874″ x 11.811″

Surface Testing

Surface treating gives DH2F enhanced abrasion and corrosion resistance.

Abrasion Speed (ft/s)

Abrasion loss (mm²kgfx10-7)

DH2F

H13

0.656

3.76

3.50

1.6728

5.24

3.56

3.0832

3.50

5.24

5.34663

3.03

5.56

6.4616

4.04

5.24

7.8064

4.61

5.24

Test Machine

Ohgoshi method abrasion test apparatus

Abrasion Load

656ft

Final Load

1.4982lbs

Mating Material (disk)

D2.HRc57

Abrasion Speed

0.656 to 7.872 ft./sec.

Test Piece Hardness

HRc 42

Erosion Resisitance

Weight Before

Test (gr)

Weight After

Erosion Loss

Test (gr)

(gr)

(%)

D2HF

27.33

23.18

4.15

15.2

H13

27.12

23.39

3.73

13.9

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


Test piece size:

Tension test:

.315″ dia. X 3.543″

Charpy impact test:

JIS NO. 3 test piece (R1, .079″ hole depth) obtained from the material in the rolling direction.

Average coefficient of Thermal Expansion for DH2F and H-13

68~212°F

68~392°F

68~572°F

68~752°F

68~932°F

68~1,112°F

68~1,292°F

DH2F

4.94

6.00

6.61

7.00

7.28

7.61

7.72

H13

4.78

5.61

6.33

6.78

7.11

7.39

7.56

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 (%) of D2HF

Corresponding JIS Spec

C

Si

Mn

Cr

Mo

V

Free Machining Elements

0.32 – 0.42

0.5

0.5

4.50 – 5.50

1.00 – 1.50

0.40 – 1.20

Added

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