HP1 steel:
high-temperature characteristics and maximum toughness

HP1 steel is a Cr-Mo-V alloyed hot-work tool steel with very good high-temperature strength characteristics and maximum toughness. This steel is also characterised by good thermal shock resistance. HP1 is only manufactured in remelted version according to the ESU process.

  • High-temperature strength .
  • Maximum toughness.

HP1 is particularly suitable for the following applications with maximum mechanical and thermal loads:

  • Pressure die casting.
  • Extrusion presses: Dies with high toughness requirements.
  • Inner liners.
  • Hot forming.

Physical properties of HP1

Temperature in °C20-10020-40020-600
Thermal expansion in 10-6m/m x K11.512.613.1
Temperature in °C20200400
Thermal conductivity in W/m x K29.530.530.5
Temperature in °C20
Density in g/cm37.8
Temperature in °C20
E module in GPa214

Heat treatment

Soft annealingTemperature: 820 – 840 °C, 4 – 6 hrs.
Cooling: soft furnace cooling
Hardness: max. 220 HB
HardeningTemperature: 1015 – 1025°C
Cooling Air, warm bath of approx. 540 °C, Oil/polymer; Interrupt oil or polymer cooling at 230 – 280 °C or vacuum hardening
TemperingTemperature: 540 – 680 °C
Hardness: see tempering graph
NitridingIf die-casting dies are to be nitrided, nitriding program 99 should be selected. This nitriding layer does not have a compound layer and therefore does not have a negative influence on the formation of thermal shock cracks.
Preheat before useTemperature: 150 – 350 °C

Graphs and datasheets of HP1




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