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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]	17,3
Solidus [°C]	920
Liquidus [°C]	960
As cast hardness [HV]	85

Ingredient

Ag Cu Zn Ni Deoxidant Grain Refiner Other

Typical Applications

General Characteristics
As Cast Grain Size [µm]	400

Color Coordinates
L*	86,4
a*	8
b*	22,9
c*	24,3

Mechanical Caracteristics
Tensile Strength (Rm) [MPa]	280
Yields strength (Rp0.2) [MPa]	180
Elongation Rupture (A) [%]	47
As cast Hardness [HV]	85
Hardness after 70% area red. [HV]	150
Hardness after annealing [HV]	90
Hardness after age-hardening [HV]	90

Casting Processing Parameters
Pre-mixing temperature [°C]	1070

Casting Temperatures	Metal [°C]	Flask [°C]
Thin (below 0.5 mm )	1060 - 1090	660 - 720
Medium ( from 0.5-1.2 mm)	1040 - 1060	600 - 660
Thick (Thick 1.2 mm)	1020 - 1040	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]	1060-1100
Pickling	Sulphuric Acid (%10)

Casting Temperature	Metal - from [°C]	Metal - to [°C]
Ingot Making	1060	1100
Continuous Casting	1080	1140

Reccomended reductions
Sheet - area or thickness [%]	70
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	300	100	Cooling in furnuce

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