Forged, annealed blocks
200 | 300 | 400 | |||||||||
200 | X | X | X | ||||||||
Use:
Drills, milling cutters, taps, reamers
Knives and cutting tools for high hardness and wear
Tools for dry or minimally lubricated machining
Forming tools for sheet metal and plastic at higher temperatures
Tools where maintaining hardness under thermal stress is crucial
Heat treatment:
Preheating: 450–850 °C (multi-stage)
Quenching: 1180–1230 °C (oil, air, salt, vacuum)
Tempering: 3× 550–580 °C – for maximum stability and hardness
Hardness after hardening: 64–66 HRC
Features:
High hardness after hardening (up to 64–66 HRC)
Excellent resistance to wear and deformation
Maintains hardness at high temperatures
Easy to sand
More brittle than conventional tool steels – not suitable for impact loads
Possibility of surface treatments (TiN, TiAlN…)
DIN 1.3343 is the most commonly used high-speed steel. It has a high content of tungsten, molybdenum and vanadium, which gives it excellent cutting properties, high hardness even at elevated temperatures (red hardness) and excellent wear resistance. It is used primarily for metalworking tools, but also for cutting and forming tools with high loads.
Alternative designation: HS652, ČSN 19830
Type: High-speed tool steel (HSS)