Quote:
Originally posted by koslov
Update: Lytron uses 316L stainless steel that is "mechanically expanded into the copper fins for an intimate thermal connection."
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Just a hunch, but I'm willing to bet they have a thinner wall on the SS tubing than the copper. Given the higher strength of SS, this is a good way to make up for the crappy conductivity.
316SS is far from a special steel. Along with 304, it's among the most common of stainless grades. The "L" merely means that it has low carbon content, which aids a little in welding.