| 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.
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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
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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)
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H-13
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Cutting
parameters
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Tool:
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SKH51
0.394" dia., tapered-shank
drill a=118°
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Feed:
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0.0039"/rev
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Hole
depth:
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1.181"
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Cutting
speed:
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25m/min
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Test
piece hardness:
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40
HRc
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Test
piece size (inches)
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3.937"
x 7.874" x 11.811"
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Surface
Treating
Surface
treating gives DH2F enhanced abrasion and
corrosion resistance.
Abrasion Resistance
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Abrasion
speed (ft./sec.)
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Abrasion
loss (mm²kgfx10-7)
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DH2F
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H13
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0.656
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3.76
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3.50
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1.6728
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5.24
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3.56
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3.0832
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3.50
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5.24
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5.34643
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3.03
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5.56
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6.4616
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4.04
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5.24
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7.8064
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4.61
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5.24
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Test
machine:
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Ohgoshi
method abrasion test apparatus
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Abrasion
distance:
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656
ft.
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Final
load:
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1.4982
lbs.
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Mating
material (disk):
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D2.HRc57
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Abrasion
speed:
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0.656
to 7.872 ft./sec.
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Test
piece hardness:
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HRc
42
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Erosion
Resistance
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Spec.
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Weight
Before
Test
(gr)
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Weight
After
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Erosion
Loss
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Test
(gr)
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(gr)
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(%)
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DH2F
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27.33
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23.18
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4.15
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15.2
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H13
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27.12
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23.39
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3.73
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13.9
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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
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Test
piece size:
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Tension
test:
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.315"
dia. X 3.543"
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Charpy
impact test:
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JIS
NO. 3 test piece (R1, .079" hole
depth) obtained from the material in the
rolling direction.
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Physical
Properties
Average
coefficient of Thermal Expansion for DH2F and
H-13
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Spec.
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68~212°F
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68~392°F
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68~572°F
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68~752°F
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68~932°F
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68~1112°F
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68~1292°F
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DH2F
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4.94
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6.00
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6.61
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7.00
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7.28
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7.61
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7.72
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H13
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4.78
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5.61
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6.33
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6.78
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7.11
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7.39
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7.56
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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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Chemical
composition (%)
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Daido
spec.
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Corresponding
JIS spec.
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C
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Si
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Mn
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Cr
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Mo
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V
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Free-
machining elements
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DH2F
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-
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0.32-0.42
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1.5
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1.5
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4.50-5.50
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1.00-1.50
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0.40-1.20
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Added
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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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|
International Mold Steel, Inc.