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AlphaRoyal1893

18

General Information
Category	Gold
Caratage	18K
Color	Yellow
Color Shade	3N
Typology	Alloys For Gold
Production Process	İnvestment Casting
Density [cm³]	15,1
Solidus [°C]	780
Liquidus [°C]	880
As cast hardness [HV]	137

Ingredient

Ag Cu Zn Ni Deoxidant Grain Refiner Other

Typical Applications

General Characteristics
As Cast Grain Size [µm]	150

Color Coordinates
L*	87,5
a*	5,2
b*	22,5
c*	23,1

Mechanical Caracteristics
Tensile Strength (Rm) [MPa]	435
Yields strength (Rp0.2) [MPa]	270
Elongation Rupture (A) [%]	38
As cast Hardness [HV]	137
Hardness after 70% area red. [HV]	260
Hardness after annealing [HV]	151
Hardness after age-hardening [HV]	259

Casting Processing Parameters
Pre-mixing temperature [°C]	1050

Casting Temperatures	Metal [°C]	Flask [°C]
Thin (below 0.5 mm )	1050 - 1070	700 - 730
Medium ( from 0.5-1.2 mm)	1020 - 1050	600 - 660
Thick (Thick 1.2 mm)	980 - 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]	1050-1060
Pickling	Sulphuric Acid (%10)

Casting Temperature	Metal - from [°C]	Metal - to [°C]
Ingot Making	1000	1020
Continuous Casting	1000	1080

Reccomended reductions
Sheet - area or thickness [%]	70
Wire - diameter [%]	50

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

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