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AlphaUni188


General Information
Category Gold
Caratage 18-22K
Color Yellow
Color Shade 3N
Typology Alloys For Gold
Production Process General
Density [cm3] 15,40
Solidus [°C] 865
Liquidus [°C] 910
As cast hardness [HV] 140
Ingredient
  • Ag
  • Cu
  • Zn
  • Ni
  • Deoxidant
  • Grain Refiner
  • Other
Typical Applications
Open System
Closed System
General Characteristics
As Cast Grain Size [µm] 70
Color Coordinates
L* 86
a* 5,2
b* 23,7
c* 24,3
Mechanical Caracteristics
Tensile Strength (Rm) [MPa] 491
Yields strength (Rp0.2) [MPa] 295
Elongation Rupture (A) [%] 44
As cast Hardness [HV] 140
Hardness after 70% area red. [HV] 245
Hardness after annealing [HV] 155
Hardness after age-hardening [HV] 190
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
Mechanical Working Parameters
Pre-mixing temperature [°C] 1020-1080
Pickling Sulphuric acid (%10)
Casting Temperature Metal - from [°C] Metal - to [°C]
Ingot Making 1020 1080
Continuous Casting 1080 1120
Reccomended reductions
Sheet - area or thickness [%] 65
Wire - diameter [%] 45
Mechanical working recommended annealing Temperature [°C] Time [min]
> 5 mm 660 - 700 40
1 - 5 mm 660 - 700 30
< 1 mm 660 - 700 20
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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