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AlphaFine764
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General Information
Category
Gold
Caratage
8-21K
Color
Red
Color Shade
Red
Typology
Alloys For Gold
Production Process
Universal
Density [cm
3
]
10,7
Solidus [°C]
945
Liquidus [°C]
1000
As cast hardness [HV]
105
Ingredient
Ag
Cu
Zn
Ni
Deoxidant
Grain Refiner
Other
Typical Applications
Open System
Closed System
Press
CNC and Lathe Production
Handmade
Hollow Chain
Machine Chain
Wire Production
Production of tube from continuous casting
Sheet Production
Hollow chain Production
General Characteristics
As Cast Grain Size [µm]
275
Color Coordinates
L*
85,3
a*
9,5
b*
14,2
c*
17,1
Mechanical Caracteristics
Tensile Strength (Rm) [MPa]
405
Yields strength (Rp0.2) [MPa]
190
Elongation Rupture (A) [%]
30
As cast Hardness [HV]
105
Hardness after 70% area red. [HV]
230
Hardness after annealing [HV]
120
Hardness after age-hardening [HV]
110
Casting Processing Parameters
Pre-mixing temperature [°C]
1080
Casting Temperatures
Metal [°C]
Flask [°C]
Thin (below 0.5 mm )
1090
-
1120
660
-
720
Medium ( from 0.5-1.2 mm)
1070
-
1090
600
-
660
Thick (Thick 1.2 mm)
1040
-
1070
540
-
600
Trees without stones
Remove the flask within 1 minute after pouring, then quench immediately in water.
Stone-in-place casting trees
Remove the flask immediately from the machine. Dip only the bottom part of the tree in cold water and keep under ventilation for 15 minutes. Quench in water.
Pickling :
Sulphuric acid (%10) - 5 min - 50°C
Mechanical Working Parameters
Pre-mixing temperature [°C]
1080-1110
Pickling
Sulphuric Acid (%10)
Casting Temperature
Metal - from [°C]
Metal - to [°C]
Ingot Making
1080
1110
Continuous Casting
1090
1170
Reccomended reductions
Sheet - area or thickness [%]
70
Wire - diameter [%]
45
Mechanical working recommended annealing
Temperature [°C]
Time [min]
> 5 mm
630
-
670
40
1 - 5 mm
630
-
670
30
< 1 mm
630
-
670
20
Age Hardening Processing Parameters
Single step age-hardening treatment
Temperature [°C]
Time [min]
Quenching
Age-hardening
Age-hardening
300
100
Cooling in furnuce
12
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