Heat Treatment Specifications
Austenitizing
Temperature1180°C(2156°F)
Soak Time5 minutes
Tempering
Temperature560°C(1040°F)
Time120 minutes
Cycles3x
Quench Medium
oil
Target Hardness
65 - 66 HRC
Performance Characteristics
Toughness8/10
Edge Retention8/10
Corrosion Resistance2.5/10
Ease of Sharpening4.5/10
Overall Score23/40
Interesting Facts
- 1Hitachi powder metallurgy high-speed steel
- 2Part of HAP series including HAP40 and HAP72
- 3Designed for extreme hardness applications
- 4Used primarily in Japanese kitchen knife production
Famous Uses
High-end Japanese kitchen knives
Ultra-premium cutting tools
Best For
Industrial cutting tools
High-end kitchen knives
Maximum edge retention
Similar Steels
Not Recommended For
- Wet environments
- Field use
- Budget
Expert Tips
- 1PM process for fine carbides
- 2Not stainless - rusts easily
- 3Very difficult to sharpen
- 4Extreme hardness