M35 High-Speed Steel
1.3243
- EN1.3243
- ENHS6-5-2-5
- AISIM35
High-speed steel containing 5% cobalt. Retains its hardness at high temperatures; thanks to the cobalt content it is preferred over 1.3343 for high-speed cutting operations. Suitable for wire EDM, welding, PVD and CVD coating.
01Applications
- All milling cutters requiring high performance
- Drills exposed to high stresses
- Shear blades
- Profile cutting knives
- Machining of high-strength materials
- Broaches
- Hobs
02Delivery Condition
- 60–64 HRC
03Heat Treatment
Typical values
- Soft annealing
- 770–840 °C; max. 280 HB
- Stress relieving
- 600–650 °C
- Preheating
- Three stages: 450–550 °C, 850 °C, 1050 °C
- Hardening
- 1200–1240 °C; short soak (80–150 s)
- Quenching medium
- 500–550 °C salt bath + air; pressurised gas in vacuum
- Tempering
- 540–570 °C, three times, 1–2 h
- Working hardness
- 64–67 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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