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AlphaUni187

18

General Information
Category	Gold
Caratage	18K
Color	Yellow
Color Shade	2N
Typology	Alloys For Gold
Production Process	General
Density [cm³]	14,40
Solidus [°C]	875
Liquidus [°C]	930
As cast hardness [HV]	115

Ingredient

Ag Cu Zn Ni Deoxidant Grain Refiner Other

Typical Applications
Open System
Closed System

General Characteristics
As Cast Grain Size [µm]	63

Color Coordinates
L*	87,5
a*	2,9
b*	24,6
c*	24,8

Mechanical Caracteristics
Tensile Strength (Rm) [MPa]	500
Yields strength (Rp0.2) [MPa]	255
Elongation Rupture (A) [%]	39
As cast Hardness [HV]	115
Hardness after 70% area red. [HV]	235
Hardness after annealing [HV]	128
Hardness after age-hardening [HV]	180

Casting Processing Parameters
Pre-mixing temperature [°C]	1080

Casting Temperatures	Metal [°C]	Flask [°C]
Thin (below 0.5 mm )	1080 - 1100	700 - 730
Medium ( from 0.5-1.2 mm)	1050 - 1080	680 - 700
Thick (Thick 1.2 mm)	1020 - 1050	650 - 680

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	275	100	Cooling in furnuce

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