Alloy tool steel for hot working for moulds for die casting of aluminium alloys, magnet, zinc, pressing pipes, copper alloy bars and light metals under pressure.
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It is characterized by very high hardenability, resistance to tempering, possibility of working at high temperatures and low susceptibility to forming a surface crack net.
Disadvantages of the grade are low sensitivity to rapid temperature fluctuations during operation, low impact and shock resistance. Before use the tools must be warmed to a minimum temperature of 200 C, but must not exceed the tempering temperature.
It is used for the production of hot working knives, die inserts for presses and forging machines, screws, dies, moulds for plastics, stamps, mandrels, punches, copper rolling mills.
The steel is also available after ESR electroslag melting, which guarantees high purity - recommended for moulds for casting non-ferrous metal alloys under pressure, and ESF which guarantees fine-grainability.
max. 230 HB
(&#; max. 780 N/mm²)
27 W/m K
high-alloy hot-work steel with high toughness and heat resistance, hot cracks resistance and good thermal conductivity; for very high requirements available in grade *ESR (Electro-Slag Remelted)
moulding plates and inserts for plastic injection mould tools; *ESR for applications for die casting (Al, Mg, Zn)
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highly suitable:
Polishing
very easily feasible (graining):
Etching
EDM:
in the hardened and tempered condition, treat again for stress relief about 20 °C below the last tempering temperature
Nitriding:
increases the wear resistance and prevents the bonding of casting material
Hard chroming:
in special cases
Annealing:
750 to 800 °C, about 4 to 5 hours slow controlled cooling of 10 to 20 °C per hour to about 600 °C; further cooling in air, max. 205 HB
Hardening:
to °C
15 to 30 minutes keeping curing temperature
quenching in water/oil/air
obtainable hardness: 50&#;56 HRC
Nitriding:
Before nitriding stress-relief annealing is recommended at 550 °C. (Meusburger standard)
A treatment at 525 °C in ammonia gas results in a surface hardness of approx. 55 HRC
Tempering:
slow heating to tempering temperature immediately after hardening; minimum time in furnace: 1 hour per 20 mm part thickness; repeated tempering is recommended
Tempering chart:
High temperature strength chart:
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