Heat-hardening procedures for Argentium Silver  
(Higher HV/DPH number = greater hardness)

Procedure

 Step 1 →

Step 2 →

Approx. hardness (HV/DPH)

Quenching

Heat silver to a pale red annealing temperature, wait until visible red heat has disappeared, then water quench.  If using a furnace, the recommnended temperature is 1050°F/565°C.

Heat silver in a furnace  or oven at 580°F/300°C for approximately 60 minutes, then air-cool to room temperature.

AS925 alloy - 120-125

AS970 alloy - 100-110

Air-cooling
(simple procedure)

After annealing or soldering, allow silver to air-cool to room temperature.

Heat silver in a furnace or oven at 580°F/300°C for approximately 45-60 minutes, then air-cool to room temperature.

AS925 alloy - 100-110

AS970 alloy - 90-95

 N.B.:

• Lower temperatures can be used for Step 2 (minimum temperature of 365°F/220°C), with a corresponding increase in time.  For example, samples would need to be heated for approximately 2 hours at 365°F/220°C.

• Ovens, furnaces and supports should be pre-heated to the required temperature, before commencing the heat-hardening treatments.

• Slight discolouration may occur during the heating processes, this can easily be removed using a weak pickle.
  

• Argentium 930 Silver shows a paler colour when it is red hot.  It is recommended to carry out heating applications (e.g.: soldering and annealing) in a shaded area, to facilitate temperature/colour recognition and prevent overheating.