W6mo5cr4v2 Heat Treatment Guide For M2 High Speed Steel - China

W6Mo5Cr4V2 heat treatment is the key to unlocking the full performance of this tungsten-molybdenum high speed steel (AISI M2 equivalent).

Correct annealing, hardening and tempering give the steel its famous red hardness, wear resistance and toughness.

Wrong temperature control, on the other hand, causes brittle carbide networks, decarburization or poor hardness response.

1 - Annealing (Softening)

- Temperature: 850-870C, hold 2-4 hours

- Slow furnace cooling at about 20-30C per hour down to 600C, then air cool

- Resulting hardness: max 255 HB, ideal for machining 2 - Preheating

- First stage: 550-600C to equalize the cross section

- Second stage: 850C just below the transformation point

- Preheating prevents thermal shock and cracking of large tools 3 - Hardening (Austenitizing)

- Salt bath or vacuum furnace recommended

- Small tools: 1180-1200C; larger or tougher tools: 1200-1230C

- Short soaking time, usually 1-2 minutes per mm of section

- Quench: oil, salt bath at 500-550C, or pressurized gas 4 - Tempering (Triple Temper)

- Temperature: 540-560C, 2 hours each cycle

- Three tempering cycles are mandatory to transform retained austenite

- Final hardness: HRC 62-65 with secondary hardening peak 5 - Optional Cryogenic Treatment

- Deep freezing to -150C after first temper improves dimensional stability and wear life.

Common Faults to Avoid: overheating causes coarse grain and brittleness; too slow quench brings carbide precipitation at grain boundaries; skipping a temper leaves untransformed austenite and early failure.

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