HS10-4-3-10 High Speed Steel
1.3207
- EN1.3207
- ENHS10-4-3-10
High speed steel with high cobalt and tungsten content, in the highest hot hardness class. Used for heavy-duty machining of hard and high-strength materials.
01Material Properties
- Very high hot hardness and tempering resistance
- High wear resistance
- Low toughness; care in interrupted cutting
- Heat treated to 66–68 HRC
02Applications
- Milling cutters for hard and heat-resistant materials
- Heavy roughing lathe tools
- High-performance drills and reamers
- Cold forming and extrusion tools
03Delivery Condition
- Max. 302 HB, soft annealed.
04Heat Treatment
Typical values
- Soft annealing
- 800–850 °C; max. 302 HB
- Stress relieving
- 600–650 °C
- Preheating
- Three stages: 450–550 °C, 850 °C, 1050 °C
- Hardening
- 1210–1240 °C; short soak (80–150 s)
- Quenching medium
- 500–550 °C salt bath + air; pressurised gas in vacuum
- Tempering
- 550–570 °C, three times, 1–2 h
- Working hardness
- 66–68 HRC
- Note
- Protective atmosphere/vacuum against decarburisation
Heat treatment cycle (schematic)
Tempering diagram (approximate)
Values are approximate and for information only; they vary with section size, heat and furnace conditions. Binding values are determined from the manufacturer’s data under laboratory conditions.
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