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AlphaCast236
18
General Information
Category
Gold
Caratage
18K
Color
White
Color Shade
Standart White
Typology
Alloys For Gold
Production Process
İnvestment Casting
Density [cm
3
]
14.45
Solidus [°C]
891
Liquidus [°C]
919
As cast hardness [HV]
186
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*
86.75
a*
2.30
b*
12.88
c*
13.08
Mechanical Caracteristics
Tensile Strength (Rm) [MPa]
441
Yields strength (Rp0.2) [MPa]
335
Elongation Rupture (A) [%]
25
As cast Hardness [HV]
186
Hardness after 70% area red. [HV]
Hardness after annealing [HV]
Hardness after age-hardening [HV]
212
Casting Processing Parameters
Pre-mixing temperature [°C]
1100
Casting Temperatures
Metal [°C]
Flask [°C]
Thin (below 0.5 mm )
1020
-
1050
660
-
700
Medium ( from 0.5-1.2 mm)
1000
-
1020
620
-
660
Thick (Thick 1.2 mm)
980
-
1000
580
-
620
Trees without stones
After casting, cooling time for the flaks is 45 minutes.
Stone-in-place casting trees
After casting, cooling time for the flaks is 15 minutes.
Pickling :
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
285
100
Cooling in furnuce
12
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