1.2210 Cold-work steel

Designation

Chemical composition:

Strength:

max. 220 HB
(≈ max. 750 N/mm²)

Thermal conductivity at 100 °C:

33 W/m K

Character:

Chrome-Vanadium alloyed cold-work steel with high wear resistance; also known as silver steel.

Application:

small turned parts, core pins, punches and engraving tools

Treatment by

unusual:
Polishing, etching, EDM, nitriding, hard chroming

Heat treatment:

Soft annealing:
710 to 740 °C for about 2 to 5 hours; slow controlled cooling of 10 to 20 °C per hour to about 600 °C; further cooling in air, max. 220 HB

Hardening:
780 to 840 °C
15 to 30 minutes keeping curing temperature
quenching in water/oil
obtainable hardness: 64-66 HRC

Tempering:
slow heating to tempering temperature immediately after hardening;
minimum time in furnace: 1 hour per 20 mm part thickness,
min. 2 hours/cooling in air

Annealing graph:

Technical tip:

• Silver steel 1.2210 is finish-ground to h9 tolerance.

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