Plastic Injection

– Heat Treatable –

Astro® ESR

ESR (Electro Slag Remelting) hot work tool steel with very good toughness and cleanliness.

Chemical Composition

NO DIN C Si Cr Mo V Mn P S
1.2343 ESR X37CrMoV5-1 0,33-0,41 0,80-1,20 4,80-5,50 1,10-1,50 0,30-0,50 0,25-0,50 Max 0,01 Max 0,003

Material Properties

  • High toughness and ductility.
  • Very good microstructural cleanliness and homogeneity.
  • Very good Polishability.
  • Good hot strength and tempering back resistance.
  • Very good texturing ability.
  • Good weldability.
  • Good machinability.
  • Up to 54 HRc after heat treatment.
  • Recommended working hardness 44-52 HRc.
  • Good nitriding and coating ability.

Applications

  • Precision Plastic injections molds,
  • High gloss plastic injection moulds,
  • Molds for piano black surfaces such as headlights lens molds.
  • Molds for abrasive polymers and reinforced resins.
  • Die casting dies for medium run
  • Die casting dies of lighting and other large parts.
  • Secondary sections on high pressure die casting dies for long run.
  • Dies for all press forging applications.
  • Cutting and shearing blades thicker than 10 mm.
  • Cold forging and cold extrusion dies.
  • Industrial knives resistant to ductile fracturing and breaking risks.

Heat Treatment

HEAT TREATMENT TEMPERATURE
Soft Annealing 750-800°C
Stress Relieving 600-650°C
Hardening 1020-1060°C
Tempering 530-700°C

Physical Properties

20°C 100°C 400°C 500°C 600°C
Elastic Modulus [kN/mm²] 210 - 183 176 168
Thermal Expansion Coefficient [10ˉ6/K] - 10,7 11,8 11,9 12,4
Thermal Conductivity [W/mK] - 28,4 27,1 29,9 28,5

Delivery Condition

230 HB, Soft annealed.

Tempering Graph