ENDURA (Impact + Abrasion Resistance)
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CREUSABRO 8000 (Impact + Abrasion Resistance)
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GRIZZLY DECKS, SCREENS & GRATES
TITUS MANGANESE (Impact + Abrasion Resistance)
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A modified H13 mould steel, pre-hardened to 37-41 HRC with exceptional machinability.
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.
| Parameters | ||||||||||
| Tool Material | Tool Shape | Cutting Fluid | Feed | Cut | Cutting Speed | Test Piece Size | Hardness | Tool Life End Point | ||
| Tool | 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 | |
DH2F (modified H-13, pre-hardened)
H13
| Tool: | SKH51 0.394″ dia., tapered-shank drill a=118° |
| Feed: | 0.0039″/rev |
| Hole depth: | 1.181″ |
| Cutting speed: | 25 m/min |
| Test piece hardness: | 40 HRc |
| Test piece size (inches): | 3.937″ x 7.874″ x 11.811″ |
Surface treating gives DH2F enhanced abrasion and corrosion resistance.
| Abrasion Speed (ft./sec.) | Abrasion loss (mm2 kgfx10-7) | |
| 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 |
| 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.
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.
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.
| 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
| Spec. | 68~212°F | 68~392°F | 68~572°F | 68~752°F | 68~932°F | 68~1112°F | 68~1292°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 |
Hardening: 1886°F, air-cooling
Tempering: 1166°F x 1 hr.
Hardness: 40 HRc
The material, as delivered, does not require heat-treating. This data is presented merely for reference.
| Chemical Composition (%) | ||||||||
| Daido Spec. | Corresponding JIS Spec. | C | Si | Mn | Cr | Mo | V | Free-machining elements |
| DH2F | – | 0.32-0.42 | 1.5 | 1.5 | 4.50-5.50 | 1.00-1.50 | 0.40-1.20 | Added |
