1.2083 / 1.2083 ESU Steel for through hardening

Designation

Chemical composition:

Strength:

max. 240 HB
(≈ max. 800 N/mm²)

Thermal conductivity at 100 °C:

18 W/m K

Character:

low corrosion, high-alloy, low warpage steel for through hardening with excellent properties for mirror polishing as well as good photoetching, good machinability, high wear resistance and high dimensional stability

Application:

mould plates and inserts for working with chemically aggressive plastics; because of excellent polishing, suitable for optical and medical products

Treatment by

Polishing:
can be polished in the annealed and hardened state; good preliminary surface preparation work is decisive for a good polish

Etching:
good photoetching (graining)

EDM:
in the hardened and tempered condition, treat again for stress relief about 20°C below the last temperature
unusual:

Nitriding, hard chroming

Heat treatment:

Soft annealing:
750 to 800°C for about 2 to 5 hours
slow controlled cooling of 10 to 20°C per hour to about 650°C; further cooling in air, max. 200 HB

Hardening:
1000°C to 1050°C
15 to 30 minutes keeping curing temperature
quenching in oil/compressed gas/hot bath
obtainable hardness: 53 - 56 HRC

Tempering:
slow heating to tempering temperature immediately after hardening;
minimum time in furnace: 2 hours per 20 mm part thickness;
Tempering twice is recommended.

Annealing graph:

Technical tip

• Cold-work steel
• must be tempered several times after hardening (max. 52HRC). The demand for “max. hardness” often ends up in material breakage.
• mould temperature max. 200°C
• corrosion-resistant after hardening
• The ESR quality guarantees an extremely pure and homogeneous microstructure.

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