1.1730 Tool steel

Designation

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:

To the mould making overview To the die making overview