 United
Precious Metal Refining, Inc.
800 SERIES YELLOW ALLOYS
FOR 10 & 14 KARAT YELLOW GOLD
SHEET, PLATE & WIRE FABRICATION
Thank you for using UNITED'S alloys.
United #800 Series Yellow Alloys are formulated for I 0 to 14
Karat Yellow Gold sheet, plate, and wire fabrication giving a Yellow
color. The #800 Series Yellow Alloys can also be used for investment
casting if desired.
MELTING The #800 Series Yellow Alloys and fine gold should be
melted together in a clean crucible. Put the alloy in the bottom of
the crucible and the fine gold on top. Initial melting temperature
should be 1040° C / 1904° F. Drop the temperature somewhat before
pouring as listed below. Boric acid flux may be used to keep the
metal clean during the melting process. The metal should be mixed
well with a stirring rod before pouring to assure a good mix.
POURING TEMPERATURE FOR INGOTS
1OK - 980°C / 1796°F
14K - 950°C / 1742°F
POURING
Metal should be poured into a preheated, vertical
graphite, or lightly lubricated iron mold. A steady even pouring
motion should be used, slowing down at the end of the pour to
prevent shrinkage in the top of the ingot. Use a round rod mold for
wire, and a 2 piece L shaped mold for plate and sheet.
QUENCHING
The metal ingot should be removed from the mold and
quenched immediately in pickle solution or water. For heavy ingots,
a one minute cool down before quenching prevents quench cracking.
FABRICATION
The metal ingot should be cleaned of all adhering
oxide or fluxes before rolling. The ingot should be rolled or drawn
to a 50% reduction in size before annealing. After annealing
continue the reduction at 50% before annealing again. Clean the
ingot after each anneal. Keep the rolls, dies, and metal clean to
prevent defects in the finished stock.
ANNEALING
Annealing temperature 675° C/1250° F for 2O minutes.
Quench immediately in water or pickle solution. A boric acid fire
coat should be applied before annealing in an open atmosphere oven
to protect the metal from heavy oxidation. Avoid over-annealing wire
or plate stock as this can cause excessive grain growth creating
orange peel effect on the surface of finished goods.
REMELTING
Use a 50% scrap to fresh mix when remelting to prevent
oxide build up in the metal.
INVESTMENT CASTING
Pre-Alloy #800 Series Yellow Gold Alloy and
Fine Gold pour into water to make shot.
PRE-ALLOYING TEMPERATURE
1040° C, 1904° F.
CASTING TEMPERATURE
10K Yellow - 960°- 980° C, 1760°- 1796°F
14K
Yellow - 930°- 950° C, 1706°- 1742°F
FLASK TEMPERATURE
Normal recommended temperature.
QUENCH TIME
Wait 15 minutes before quenching flasks.
TECHNICAL ASSISTANCE
Always available…
Call 1-800-999-3463 / 1-800-999-FINE
E-mail / doc@unitedpmr.com
Web-Site / www.unitedpmr.com |