Ok, I give up.
I have a stainless 1" nut I was trying to solder to my stainless kettle for an electric element. cleaned both surfaces with bkf rinsed and dried then wiped with alcohol, let it dry, applied stayclean liquid flux, but when I tried to solder the nut on, solder will not stick to the nut. sticks fine to the kettle.
I have soldered all of my other fittings and soldered a nut on my hlt with no problems using the same steps. This is my last fitting I needed to solder.
When I couldn't get solder to stick to the nut, I even took the nut and used a drill with a stainless brush on it to try and polish it up, then dropped the nut in a small cup with stayclean liquid flux and let it soak then tried to get solder to stick to just the nut. It just beads up and falls off when it cools. There are a couple of small spots on the nut that held the solder.
The only difference between the 2 nuts I had was one was marked 304 and it soldered just fine, the 2nd one is marked 316.
Is there some special trick for soldering 316 stainless? I am soldering with a propane torch.
Thanks for any thoughts.