I've been working on a stainless steel heat exchanger for my brewing adventures. I managed to wrangle together a DIY 1/2 tubing coiler akin to the one that has been around HBT for some time. and and quite pleased at the diameter of the coil I achieved.
Now I want to compress the coil vertically, so that it is as low as possible. To this end I attempted to strap the whole thing as tight as possible using safety wire and then attempted to get it to stress relief temperature for stainless. According to this PDF the stress relief temperature for stainless (316) is 850F-1100F. Now the 'self-clean' mode of the average home oven reaches 900-1000F so I thought I was golden. Pop the strapped coil in the oven, and turn on the self cleaning cycle. At the end, unfortunately the coil just popped open like a spring, and now has a slightly brownish tinge to it.
Can anyone with insight into metallurgy tell me where I went wrong, and what I can do to get this coil to be as flat as possible in its relaxed state?
Now I want to compress the coil vertically, so that it is as low as possible. To this end I attempted to strap the whole thing as tight as possible using safety wire and then attempted to get it to stress relief temperature for stainless. According to this PDF the stress relief temperature for stainless (316) is 850F-1100F. Now the 'self-clean' mode of the average home oven reaches 900-1000F so I thought I was golden. Pop the strapped coil in the oven, and turn on the self cleaning cycle. At the end, unfortunately the coil just popped open like a spring, and now has a slightly brownish tinge to it.
Can anyone with insight into metallurgy tell me where I went wrong, and what I can do to get this coil to be as flat as possible in its relaxed state?