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AlphaCast181


General Information
Category Gold
Caratage 18K
Color Yellow
Color Shade Arabic Yellow
Typology Alloys For Gold
Production Process İnvestment Casting
Density [cm3] 15,1
Solidus [°C] 850
Liquidus [°C] 880
As cast hardness [HV] 145
Ingredient
  • Ag
  • Cu
  • Zn
  • Ni
  • Deoxidant
  • Grain Refiner
  • Other
Typical Applications
Open System
Closed System
Sheet Production
General Characteristics
As Cast Grain Size [µm] 375
Color Coordinates
L* 89
a* 4,9
b* 22,1
c* 22,6
Mechanical Caracteristics
Tensile Strength (Rm) [MPa] 440
Yields strength (Rp0.2) [MPa] 250
Elongation Rupture (A) [%] 27
As cast Hardness [HV] 145
Hardness after 70% area red. [HV] 290
Hardness after annealing [HV] 160
Hardness after age-hardening [HV] 280
Casting Processing Parameters
Pre-mixing temperature [°C] 1080
Casting Temperatures Metal [°C] Flask [°C]
Thin (below 0.5 mm ) 1000 - 1030 660 - 720
Medium ( from 0.5-1.2 mm) 1000 - 980 620 - 660
Thick (Thick 1.2 mm) 960 - 980 540 - 600
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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