T1 High Speed Steel
1.3355
- EN1.3355
- ENHS18-0-1
- AISIT1
Classic tungsten-based high speed steel. Good hot hardness and edge strength; wider heat treatment tolerance than molybdenum-based grades.
01Material Properties
- Good hot hardness
- Good toughness and edge strength
- Less sensitive to decarburisation during heat treatment
- Heat treated to 63–65 HRC
02Applications
- Lathe tools and form tools
- Broaches and reamers
- Milling cutters
- Cutting blades
- Cold forming tools
03Delivery Condition
- Max. 269 HB, soft annealed.
04Heat Treatment
Typical values
- Soft annealing
- 820–860 °C; max. 269 HB
- Stress relieving
- 600–650 °C
- Preheating
- Three stages: 450–550 °C, 850 °C, 1050 °C
- Hardening
- 1260–1290 °C; short soak (80–150 s)
- Quenching medium
- 500–550 °C salt bath + air; pressurised gas in vacuum
- Tempering
- 550–580 °C, three times, 1–2 h
- Working hardness
- 63–65 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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