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AlphaFine775


General Information
Category Gold
Caratage 21K-22K
Color Yellow
Color Shade Light Yellow
Typology Alloys For Gold
Production Process Universal
Density [cm3] 16,5
Solidus [°C] 900
Liquidus [°C] 930
As cast hardness [HV] 110
Ingredient
  • Ag
  • Cu
  • Zn
  • Ni
  • Deoxidant
  • Grain Refiner
  • Other
Typical Applications
General Characteristics
As Cast Grain Size [µm] 200
Color Coordinates
L* 87,2
a* 8,3
b* 23,6
c* 25
Mechanical Caracteristics
Tensile Strength (Rm) [MPa] 400
Yields strength (Rp0.2) [MPa] 200
Elongation Rupture (A) [%] 38
As cast Hardness [HV] 110
Hardness after 70% area red. [HV] 180
Hardness after annealing [HV] 120
Hardness after age-hardening [HV] 120
Casting Processing Parameters
Pre-mixing temperature [°C] 1040
Casting Temperatures Metal [°C] Flask [°C]
Thin (below 0.5 mm ) 1040 - 1080 660 - 720
Medium ( from 0.5-1.2 mm) 1020 - 1040 600 - 660
Thick (Thick 1.2 mm) 1000 - 1020 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
Mechanical Working Parameters
Pre-mixing temperature [°C] 1030-1050
Pickling Sulphuric Acid (%10)
Casting Temperature Metal - from [°C] Metal - to [°C]
Ingot Making 1030 1050
Continuous Casting 1040 1120
Reccomended reductions
Sheet - area or thickness [%] 70
Wire - diameter [%] 45
Mechanical working recommended annealing Temperature [°C] Time [min]
> 5 mm 640 - 680 40
1 - 5 mm 640 - 680 30
< 1 mm 640 - 680 20
Age Hardening Processing Parameters
Single step age-hardening treatment Temperature [°C] Time [min] Quenching Age-hardening
Age-hardening 300 100 Cooling in furnuce
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