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Those "steel" muffin tins are TIN plated steel.
Have you ever done any soldering? What is solder? It's tin and lead, or at least it was, now it's mostly tin. What you did is solder the ingots to the steel.
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It is extreamly unlikely that the OP found any new muffin tins that were Tin plated. The process of plating with Tin has been obsolete for years, just as plated "Tin cans", no longer contain any tin.
Galvanizing (Zinc plating) is no longer used either.
http://en.wikipedia.org/wiki/Muffin_tin
Tin is too expensive to use in applying a non-rust surface to steel...there are much cheaper, and better althernatives.
"Tin cans" in the old days, used to be coated on the inside with Tin to prevent acids in food from attacking the steel of the can. With the advent of better/cheaper coatings, the only Tin used in the cans was solder in the seam. Now "Tin cans", are either drawn without a seam or the seam is a weldament...look at a can for the heat affected zone (colors like those of color case hardening), surrounding the seam on a welded can.