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Stainless steel is easily soldered using concentrated orthophosphoric acid. Soldering iron from 40 watts. Optimally 60-65 watts. For massive parts - 90 watts or more. Stainless steel does not transmit heat very well, so it can be soldered with low-power soldering irons. The main thing is to clean the surface from dirt and foreign growths. So that the stainless steel is clean. With sandpaper, alcohol, anything. Apply acid and where there is acid, there the tin will spread very easily. Reference: orthophosphoric acid is colorless hygroscopic crystals. Usually, orthophosphoric (or simply phosphoric) acid is called an 85% aqueous solution (colorless syrupy liquid without odor). Soluble in ethanol and other solvents.