Heat Treatment Specifications
Austenitizing
Temperature830°C(1526°F)
Soak Time5 minutes
Tempering
Temperature210°C(410°F)
Time40.2 minutes
Cycles3x
Quench Medium
oil
Target Hardness
63 - 65 HRC
Performance Characteristics
Toughness7.5/10
Edge Retention9.5/10
Corrosion Resistance1/10
Ease of Sharpening8/10
Overall Score26/40
Interesting Facts
- 1Oil-hardening tool steel - tungsten variant
- 2Higher wear resistance than O1
- 3Popular in European woodworking tools
- 4Good for chisels, plane irons
- 51.2519 DIN designation
- 6Less common in knives than O1
Famous Uses
Woodworking tools
European hand tools
Best For
Edge tools
Cutting implements
Taps and dies
Similar Steels
O1
More common
W2
Water hardening, different properties
Not Recommended For
- Wet environments
- Beginners
- Budget
Expert Tips
- 1Oil-hardening required
- 2Tungsten for wear resistance
- 3High hardness achievable
- 4Tool steel applications