Designation
DIN: | 45 NiCrMo 16 |
AFNOR: | 45 NCD 16
|
UNI: | 40 NiCrMoV 16 KU |
AISI: | ≈ 6F7 |
Chemical composition:
C | 0.45 |
Si | 0.25 |
Mn | 0.40 |
Cr | 1.35 |
Mo | 0.25 |
Ni | 4.00 |
Strength:
max. 280 HB
(≈ max. 950 N/mm²)
Thermal conductivity at 100 °C:
30 W/m K
Character:
Nickel alloyed steel for through hardening, with moderate machinability; very high resistance against bending and high compressive strength; very high toughness and good through hardenability, also with bigger sections.
Application:
high-performance cavity plates and inserts for the processing of plastics with high surface requirements (mirror finish); stamping, forming and bending dies for particularly high pressure and bending stresses
Treatment by
Polishing:
best metallurgical properties for mirror finish
is possible:
Etching
highly suitable:
EDM
not usual:
Nitriding
Hard chroming:
particularly increases the steel's wear resistance and corrosion resistance
Heat treatment:
Soft annealing:
610 to 650 °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. 260 HB
Hardening:
840 to 870 °C
Quenching in oil/hot bath/air
Obtainable hardness: 53-58 HRC
Tempering:
Slow heating to tempering temperature immediately after hardening. Minimum time in furnace: 1 hour per 20 mm part thickness. Tempering twice is recommended.
Annealing graph:
Technical tip:
- To avoid unwanted warping during plastic injection, the tempering temperature after hardening must exceed the operating temperature by 50 °C.
Example:
operating temperature is 200 °C
tempering at 250 °C = 52 HRC
Vers l’aperçu de la construction de moules
Vers l’aperçu de la construction d'outils de découpe