#320 YELLOW ALLOY FOR 10 & 14K
HEAT TREATABLE YELLOW GOLD
SHEET, PLATE, AND WIRE FABRICATION

Thank you for using UNITED'S alloys.

UNITED'S 315 ALLOY is designed for 18K casting, which produces a rich yellow finished color. #315 alloy does not contain deoxidizers.

You should obtain excellent results by following a few simple instructions.

United #320 Yellow Alloy is formulated for 10 to 14 Karat Yellow Gold sheet, plate and wire fabrication giving a yellow color, that can be heat treated for spring hardness. The # 320 Yellow Alloy can also be used for Investment Casting if desired.

MELTING
The #320 Yellow Alloy and fine gold should be melted together in a clean crucible. Put alloy in the bottom of the crucible and fine gold on top. Initial melting temperature should be 1040º C/ 1904º F. Drop 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
10K - 990º C 1814º F
14K - 970º C 1778º 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 40% reduction in size before annealing. After annealing continue the reduction at 40% before annealing again. Clean the ingot after each anneal. Keep rolls, dies and metal clean to prevent defects in the finished stock.

ANNEALING
Annealing temperature 675º C / 1250º F for 20 minutes. Quench immediately in water or pickle solution. A boric acid fire coat should be applied before annealing in open atmosphere ovens 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.

HEAT TREATMENT
For sheet & wire stock, solution anneal at 675º C / 1250º F for 20 minutes. Quench immediately. Bend or shape objects. Heat treat at 316º C / 600º F for 1 hour. Remove from oven, air cool. This will impart a spring hardness. For as cast items, only the heat treatment is required.

REMELTING
Use a 50% scrap to fresh mix when remelting to prevent oxide build up in the metal.

INVESTMENT CASTING
Pre-alloy #320 Yellow Alloy & Fine Gold, pour into water to make shot.

PRE-ALLOYING TEMPERATURE
1040º C / 1904º F

CASTING TEMPERATURE
10 K Yellow - 980º - 990º C / 1796º - 1814º F
14 K Yellow - 960º - 970º C / 1760º - 1778º F

FLASK TEMPERATURE
Normal recommended temperature.

QUENCH TIME
Wait 10 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