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AlphaCast188


General Information
Category Gold
Caratage 18K
Color Yellow
Color Shade Light Yellow
Typology Alloys For Gold
Production Process İnvestment Casting
Density [cm3] 15,15
Solidus [°C] 855
Liquidus [°C] 877
As cast hardness [HV] 142
Ingredient
  • Ag
  • Cu
  • Zn
  • Ni
  • Deoxidant
  • Grain Refiner
  • Other
Typical Applications
General Characteristics
As Cast Grain Size [µm] 300
Color Coordinates
L* 86,3
a* 2,7
b* 21
c* 21,2
Mechanical Caracteristics
Tensile Strength (Rm) [MPa] 385
Yields strength (Rp0.2) [MPa] 255
Elongation Rupture (A) [%] 39
As cast Hardness [HV] 142
Hardness after 70% area red. [HV] 265
Hardness after annealing [HV] 155
Hardness after age-hardening [HV] 250
Casting Processing Parameters
Pre-mixing temperature [°C] 1080
Casting Temperatures Metal [°C] Flask [°C]
Thin (below 0.5 mm ) 1020 - 1060 660 - 720
Medium ( from 0.5-1.2 mm) 1000 - 1020 600 - 660
Thick (Thick 1.2 mm) 970 - 1000 540 - 600
After casting, cooling time for the flaks is 15 m
After casting, cooling time for the flaks is 45 m
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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