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High Alloy Tool Steel / Carpenter Technology

Rex 45/HAP40

Toughness 4.5/10, Edge Retention 6/10, Corrosion Resistance 4/10. Target hardness range: 63-67 HRC.

Known aliases: CPM-Rex45.

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Technical Summary

  • CategoryHigh Alloy Tool Steel
  • ManufacturerCarpenter Technology
  • ProcessPM
  • HRC Range63-67

Ratings: Toughness 4.5, Edge 6, Corrosion 4

Source attribution: Knife Steel Nerds and SteelHardnessLab.

Chemical Composition

C1.3%
Cr4.0%
V3.0%
Mo5.0%
W6.0%
Co8.0%

SteelHardnessLab Testing Data

Testing recognition: u/679696 and u/Skylark427.

ManufacturerSamplesAvg HRC
Spyderco266.1