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AlphaFine775

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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

Trees without stones After casting, cooling time for the flaks is 15 m

Stone-in-place casting trees After casting, cooling time for the flaks is 45 m

Pickling : 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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