On Sunday, May 14, 2017 at 12:40:48 PM UTC-4, Jim Wilkins wrote:
wrote in message
...
On Sunday, May 14, 2017 at 11:46:37 AM UTC-4, Paul K. Dickman wrote:
wrote in message
...
On Saturday, May 13, 2017 at 4:18:06 PM UTC-4, Rosemary wrote:
replying to PIW, Rosemary wrote:
So, if I place a nickel silver sheet in a kiln at 600 degrees
for two
hours it
will be hardened?

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for full context, visit
http://www.polytechforum.com/metalwo...er-313971-.htm

No. You can't heat-harden nickel-silver (50% - 80% Cu; 5% - 30%
Ni; 10% -
35% Zn). It will work-harden, but not heat-harden.

There are some nickel alloys, such as certain Monels, Inconels,
and
Hastelloy, that can be heat-hardened by solution heat-treatment.
But not
the material commonly called "nickel-silver" (which contains no
silver).

If you hear otherwise, your source is wrong.

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Ed Huntress

I think they're slightly confused.
Precipitation hardening of Sterling silver is possible in the 600f
range,
although it only takes about an hour.
However it doesn't work for Nickel silver. For that, work hardening
is your
only option.

Paul K. Dickman

Right. And "nickel-silver" was commonly known as "German silver," at
least through the 1950s. To engineers, it's a type of bronze, with
no silver content at all.

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Ed Huntress

The copper-nickel alloy "Monel K500" can be hardened by heat treatment
through precipitation of the added aluminum and titanium:
http://www.hightempmetals.com/techda...elK500data.php
-jsw

Yeah, as I pointed out above, some grades of Monel and Inconel, and Hastelloy, which is a nickel-containing superalloy, can be hardened through solution treatment and precipitation.

But it doesn't apply to nickel-silver. Monel does look a lot like nickel-silver but it isn't the same thing.

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Ed Huntress