⚙️ Material designation and names

EN / DIN: 1.3343
Designation: HS6-5-2C, or X82WMoCrV6-5-2
AISI: M2
ČSN/STN: 19 830

🔩 Properties

High-speed tool steel with very high wear resistance.

Good toughness and compressive strength.

High hardness after hardening – approx. 62–66 HRC.

Resistant to softening at higher temperatures, red hardness.

Good machinability in annealed condition.

🧰 Applications

Production of drills, milling cutters, taps, reamers and knives.

Forming tools exposed to high wear.

Cutting tools for machining steels and cast irons at higher cutting speeds.

⚗️ Chemical composition

C: 0.85–0.95 %
W, tungsten: 5.5–6.7 %
Mo, molybdenum: 4.5–5.5 %
Cr, chromium: 3.8–4.5 %
V, vanadium: 1.7–2.1 %
Si: max. 0.45 %
Mn: max. 0.40 %
P, S: max. 0.03 %

🔥 Typical heat treatment

Soft annealing: 820–880 °C, slow cooling in furnace; hardness max. 255 HB.

Hardening:

Heating to 450 °C → 850 °C → austenitizing temperature approx. 1180–1230 °C.

Cooling in oil or air.

Tempering: 3× at 560 °C; final hardness 62–66 HRC.