Rubber Mold Steels
DH2F
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
 |
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 (inches) |
3.937" x 7.874" x 11.811" |
Surface Treating
Surface treating gives DH2F enhanced abrasion and corrosion
resistance.
Abrasion Resistance
Abrasion speed (ft./sec.) |
Abrasion loss (mm²kgfx10-7) |
DH2F |
H13 |
0.656 |
3.76 |
3.50 |
1.6728 |
5.24 |
3.56 |
3.0832 |
3.50 |
5.24 |
5.34643 |
3.03 |
5.56 |
6.4616 |
4.04 |
5.24 |
7.8064 |
4.61 |
5.24 |
Test machine: |
Ohgoshi method abrasion test apparatus |
Abrasion distance: |
656 ft. |
Final load: |
1.4982 lbs. |
Mating material (disk): |
D2.HRc57 |
Abrasion speed: |
0.656 to 7.872 ft./sec. |
Test piece hardness: |
HRc 42 |
Erosion Resistance
Spec. |
Weight Before
Test (gr) |
Weight After |
Erosion Loss |
Test (gr) |
(gr) |
(%) |
DH2F |
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
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.
All technical and engineering data and suggested procedures,
specifications and applications contained in this publication are for general
information only. Daido Steel, International Mold Steel and/or their
distributors disclaim any and all express or implied warranties of
merchantability, suitability for any particular purpose or use, or freedom from
infringement of any patent, trademark or copyright. DH2F® is a registered
trademark of International Mold Steel, Inc. and Daido Steel Limited.
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