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1.1730 Tool steel

Designation

DIN:	C 45 U
AFNOR:	XC 48
UNI:	-
AISI:	1045

Chemical composition:

C	0.45
Si	0.30
Mn	0.70

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: