Division Watches and Jewelry	Data sheet for alloy
	Au 750/153 S
	Colour	red - 5N	Code	153

General description	18 ct standard red gold alloy, for universal use. It can easily be cupped, stamped, rolled, polished, drawn and machined. Suitable for casting.

Physical properties	Specific gravity [g/cm3]	15.15	Melting range [°C]	890-895

Mechanical properties			Annealed	20% cold worked	75% cold worked
Vickers hardness		[HV1]	165	200	240
Yield hardness	Rm	[Mpa]	550	700	950
Elastic limit	Rp0.2	[MPa]	300	550	800
Plastic elongation	A	[%]	40	7	1.5

Processing guidelines
ANNEALING	550 °C for 20 to 30 minutes then quenched in water. In order to avoid oxidation, work under reducing atmosphere.
COLD WORKING	The amount of coldwork completed before annealing should be between 30% and 75% reduction in area.
SOLDERING	By torch or furnace. The cadmium-free solders N° 306 (820-840°C) - 305 (800-815°C) - 300 (765-800°C) and 318 (645-720°C) are strongly recommended. For alternatives, please see list of solders.
PICKLING	with DESOXYD (following operating instructions) or with hot 10% sulphuric acid. The slight change of colour which could appear can be removed by polishing.
REMARK	We would recommend the use of 153's sister alloy, Au 750/3038, for work needing several soldering or thermal operations as well as for elaborate cast work.
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18.03.2005

METALOR Technologies SA - Av. du Vignoble - CH-2009 Neuchâtel Phone: +41(0)32 720 61 11 - http://www.metalor.com/watch

18.03.2003

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