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DIN 1.3343

Classic high-speed steel with high hardness and wear resistance

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)

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

Forged, annealed blocks


200

300

400









200

X

X

X




































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…)

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

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