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:
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Zestawienie produktów do budowy tłoczników i wykrojników