[Jewelry making - Article 00997] - Re: [Orchid] Rough surface on Sterling belt buckle casting

[James Binnion]

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Ben,

    For me 1350 is a little too hot. I tend to hold at 1250 F to remove
    carbon. How do you heat your metal? Do you have a temperature
    controlled melting method? 850F may be too hot for your casting you
    may need to drop it more. A large casting like a belt buckle can
    hold so much heat that the investment will begin to break down and
    you will get sulfur dioxide gas evolved and will get lots of gas
    porosity at the surface that can lead to a rough surface this is made
    worse by incomplete carbon removal (see Eddie Bells recent posts). If
    this is the problem reducing either the metal temp or flask temp or
    both may help as will longer dwell time at 1250F. 

Jim

James Binnion
jbin AT mokume-gane.com
James Binnion Metal Arts
http://www.mokume-gane.com
360-756-6550

 
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