There is a flux for soldering steel and stainless steel called alumsolder chrome flux. I have tried this flux and I was very surprised with the results. I needed to join some steel connectors to the copper wire. There is a tutorial movie on youtube https://www.youtube.com/watch?v=pbFPwnyHkkM If you still need to solder steel just have a look at http://alumsolder.co.uk The only thing is to remember about the size of the material.. Soldering iron will not heat up large elements. Good luck.
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