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AlphaCast189


General Information
Category Gold
Caratage 18K
Color Yellow
Color Shade Light Yellow
Typology Alloys For Gold
Production Process İnvestment Casting
Density [cm3] 15,20
Solidus [°C] 850
Liquidus [°C] 880
As cast hardness [HV] 150
Ingredient
  • Ag
  • Cu
  • Zn
  • Ni
  • Deoxidant
  • Grain Refiner
  • Other
Typical Applications
Open System
Closed System
Sheet Production
General Characteristics
As Cast Grain Size [µm]
Color Coordinates
L*
a*
b*
c*
Mechanical Caracteristics
Tensile Strength (Rm) [MPa] 427
Yields strength (Rp0.2) [MPa]
Elongation Rupture (A) [%] 29
As cast Hardness [HV] 150
Hardness after 70% area red. [HV]
Hardness after annealing [HV]
Hardness after age-hardening [HV] 275
Casting Processing Parameters
Pre-mixing temperature [°C] 1080
Casting Temperatures Metal [°C] Flask [°C]
Thin (below 0.5 mm ) 1080 - 1100 700 - 730
Medium ( from 0.5-1.2 mm) 1050 - 1080 680 - 700
Thick (Thick 1.2 mm) 1020 - 1050 650 - 680
After casting, cooling time for the flaks is 45 minutes.
After casting, cooling time for the flaks is 15 minutes.
Sulphuric acid (%10) - 5 min - 50°C
Age Hardening Processing Parameters
Single step age-hardening treatment Temperature [°C] Time [min] Quenching Age-hardening
Age-hardening 275 100 Cooling in furnuce
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