Designation
DIN: | C 45 U
|
AFNOR: | XC 48
|
UNI: | - |
AISI: | 1045 |
Chemical composition:
Strength:
max. 215 HB
(≈ 710 N/mm²)
Thermal conductivity at 20 °C:
50 W/m K
Character:
unalloyed tool steel with excellent machinability, good core toughness for minor applications; chilled cast steel, suitable for flame and inductive hardening
Application:
unhardened parts for mould, die and jig construction; plates and frames for mould bases and die sets
Treatment by
unusual:
Polishing, etching, EDM, nitriding, hard chroming
Heat treatment:
Soft annealing:
680 to 710 °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. 190 HB
Hardening:
800 to 830 °C
Quenching in oil/hot bath/air
Obtainable hardness: 58 HRC
hardening depth 3−5 mm
max. 15 mm through hardening thickness
Tempering:
Slow heating to tempering temperature immediately after hardening, to 180 to 300 °C depending on desired hardness
1 hour per 20 mm: min. 2 hours
Annealing graph:
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