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AlphaUni920

21
22

General Information
Category	Gold
Caratage	21K-22K
Color	Yellow
Color Shade	Light Yellow
Typology	Alloys For Gold
Production Process	General
Density [cm³]	16.6
Solidus [°C]
Liquidus [°C]
As cast hardness [HV]

Ingredient

Ag Cu Zn Ni Deoxidant Grain Refiner Other

Typical Applications
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]

Color Coordinates
L*
a*
b*
c*

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

Casting Processing Parameters
Pre-mixing temperature [°C]	1100

Casting Temperatures	Metal [°C]	Flask [°C]
Thin (below 0.5 mm )	1100 - 1130	720 - 750
Medium ( from 0.5-1.2 mm)	1080 - 1100	700 - 730
Thick (Thick 1.2 mm)	1060 - 1080	680 - 700

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

Mechanical Working Parameters

Pre-mixing temperature [°C]	1020-1080
Pickling	Sulphuric Acid (%10)

Casting Temperature	Metal - from [°C]	Metal - to [°C]
Ingot Making	1020	1080
Continuous Casting	1080	1120

Reccomended reductions
Sheet - area or thickness [%]	65
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	325	100	Cooling in furnuce

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