<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">So, referring back to the OP about using the oven to anneal the bars, it WOULDN’T be a good choice. <div><br></div><div>Peace,</div><div>Pat<br><br><div dir="ltr">Pat Horne <div>We support Habitat for Humanity</div><div><br></div></div><div dir="ltr"><br>On Aug 8, 2020, at 10:03 AM, John Innis <jdinnis@gmail.com> wrote:<br><br></div><div dir="ltr"><div dir="ltr">This matches my understanding as well. Brass and copper soften when quenched. Steel and Aluminum harden when quenched.<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Aug 8, 2020 at 9:59 AM Bob Spidell <<a href="mailto:bspidell@comcast.net">bspidell@comcast.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Could be (the plot thickens):<br>
<br>
"Annealing copper makes it softer and less brittle, which allows you to <br>
bend it without breaking it. This malleability allows you to hammer and <br>
mold the copper into any shape you wish without cracking the metal. You <br>
can anneal any grade and thickness of copper as long as you have a flame <br>
that can transmit enough heat to the metal. The most straightforward way <br>
to anneal copper is by heating it with an oxygen acetylene torch and <br>
rapidly cooling it in water."<br>
<br>
<a href="https://www.wikihow.com/Anneal-Copper" rel="noreferrer" target="_blank">https://www.wikihow.com/Anneal-Copper</a><br>
<br>
<br>
<br>
On 8/8/2020 7:43 AM, Pat Horne wrote:<br>
> Maybe you’re right & I’m wrong! Wouldn’t be the first time.<br>
><br>
> Peace,<br>
> Pat<br>
><br>
> Pat Horne<br>
> We support Habitat for Humanity<br>
><br>
><br>
> On Aug 8, 2020, at 9:33 AM, Bob Spidell <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>> wrote:<br>
><br>
> Well snap. I've been doing it wrong all these years I've reused copper, mostly on sealing washers for oil pan plugs.<br>
><br>
> Thanks for the reply.<br>
> Bob<br>
><br>
><br>
>> On 8/8/2020 7:21 AM, Pat Horne wrote:<br>
>> I thought quenching made the metal less soft.<br>
>><br>
>> Annealing requires slow cooling.<br>
>><br>
>> Peace,<br>
>> Pat<br>
>><br>
>> Pat Horne<br>
>> We support Habitat for Humanity<br>
>><br>
>><br>
>> On Aug 8, 2020, at 9:18 AM, Bob Spidell <<a href="mailto:bspidell@comcast.net" target="_blank">bspidell@comcast.net</a>> wrote:<br>
>><br>
>> Question for the List: Is it proper to quench--in water, presumably, or oil maybe--copper to achieve softness after it's been heated 'cherry red?'<br>
>><br>
>> Bob<br>
>><br>
<br>
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