[PSUBS-MAILIST] heat treatment

[Sean T. Stevenson via Personal_Submersibles]

Hank, what is the material? What you are talking about is annealing, which requires that you bring the temperature above the recrystallization temperature of the material (or if you don't have that, 0.4 x the melting temperature) and hold for long enough for the recrystallization to occur.  You want to bring the temperature up slowly if at all possible, keeping even temperature throughout the part during ramp up, hold for a good hour, and then cool in air just as slowly. A tiger torch doesn't sound like the best way, unless you were to build an oven of sorts out of bricks and use the torch to heat it internally, instead of heating the part directly.

Sean


On May 21, 2016 4:35:02 PM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Hi all,I am making a part for Elementary 3000 and it is being machined
>from a left over port ring (3 inch thick).  I had a tough time
>machining the surfaces that were flame cut from the other ring I
>machined.  I am thinking about heating it in an enclosure with a tiger
>torch to take the temper out of the surfaces that need to be machined.
> Will this work and what temp should I take the part to.  The part will
>be non structural when completed.Hank
>
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