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1.2714 HH Steel for through hardening

Designation

DIN:	55 NiCrMoV 7
AFNOR:	55 NCDV 7
UNI:	-
AISI:	L6

Chemical composition:

C	0.56
Cr	1.10
Mo	0.50
Ni	1.70
V	0.10

Strength:

40 - 43 HRC
(≈ 1250 - 1400 N/mm²)

Thermal conductivity at 100 °C:

36 W/m K

Character:

steel for through-hardening with good heat resistance, hardenability and toughness

Application:

Inserts, cores and slides for injection moulds

Treatment by

Polishing:
technical polishing possible

is possible:
EDM, nitriding, etching and hard chroming

Heat treatment:

Soft annealing:
650 to 700 °C for about 4 to 5 hours; slow controlled cooling of 10 to 20 °C per hour to about 600 °C; further cooling in air, max. 248 HB

Hardening:
950 to 980 °C
15 to 30 minutes keeping curing temperature
quenching in water/oil
obtainable hardness: 56 HRC

Tempering:
Slow heating to tempering temperature immediately after hardening. Minimum time in furnace: 1 hour per 20 mm part thickness

Annealing graph: