(Originally published July 2017) 

General Alloy Composition

92.7% silver, 4% copper, 2.25% zinc, germanium, de-oxidizers, fluidizers, and proprietary elements

 

Suitable for

Casting

 

Melting Temperature Range

Solidus: 1,558°F (848°C)

Liquidus: 1,653°F (900°C)

 

Hardness (As-Cast) (HV)

• Dwell for 15-20 minutes (after casting, before quenching): 55-60 HV

• No dwell (less than 3 minutes): 50 HV (susceptible to thermal shock cracking)

 

Hardness (70% Cold-Work) (HV)

• Fully annealed (dead-soft) before cold working: 40-45 HV

• As-cast before cold working: 55-60 HV

• Torch annealed before cold working: 45-50 HV

 

Hardness (Age-Hardened) (HV)

• Two-step age hardness: 110-120 HV

First step: Heat to 1,292°F (700°C), wait 30 seconds, and quench in water.

Second step: Heat to 608°F (320°C), hold for 30 minutes in the furnace, and air cool.

• Single-step age hardness: 70-80 HV

Heat to 1,202°F (650°C), hold for 10 minutes in the furnace, and air cool.

 

Available Forms

Casting grain

 

Fusing Possible

No

 

Welding Possible

Yes

 

Quenching Guidelines

To avoid cracking the casting, a minimum of 25 minutes wait time is recommended before quenching. The precise time depends on the size of the flask and the amount of metal used in casting.

 

Special Tips for Working with Alloy

Cooler metal temperatures with higher flask temperatures are the best parameters for investment casting. The ideal metal casting temperature is in the range of 1,652°F to 1,832°F (900°C to 1,000°C) with a flask temperature of about 1,202°F to 1,238°F (650°C to 670°C).

 

Contact

United Precious Metal Refining

1-716-683-8334

sales@unitedpmr.com

unitedpmr.com