O2 Cold Work Tool Steel

1.2842

EN1.2842
EN90MnCrV8
AISIO2

Oil-hardening cold work tool steel with about 0.9% carbon, alloyed with manganese, chromium and vanadium. Good hardenability, low distortion in heat treatment and high dimensional stability.

01Applications

Punches and small cutting knives
Gauges and measuring tools
Small blanking and bending dies
Reamers and taps (low cutting speed)

02Heat Treatment

Typical values

Soft annealing: 680–720 °C; max. 229 HB
Stress relieving: 600–650 °C
Preheating: 600–650 °C
Hardening: 790–820 °C; 15–30 min
Quenching medium: Oil or 180–220 °C salt bath
As-quenched hardness: ≈ 63–65 HRC
Tempering: 150–300 °C, once or twice
Working hardness: 58–62 HRC

Heat treatment cycle (schematic)

Stages and temperatures are typical values; soaking times depend on section size.

Tempering diagram (approximate)

Approximate hardness versus tempering temperature after hardening from the typical austenitising temperature.

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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