Thank you much, for the link. I have filed a test piece and it is not plated. I have not checked to see if it is ferrous.
I disagree with the link to the blog that said steel can be soldered
Having worked, in a steel mill I had my doubts. I have minor experience welding and was inclined to believe that it could not be soldered.
It appears that I am back, at square one. I know that I can use ca glue, but that is very messy.
Matt, I was editing the post and accidentally deleted it-- but the jist of what I said is true- real "steel" cannot be soldered and must be welded, as you indicated. What the blog said is that "softer steel" can be soldered. Softer steel is not really steel anymore-- is an amalgam of Iron and other metals, like nickel, chromium, etc. so what they are calling "steel" isn't really that. I still suspect your part is nickel plated brass, but it might be just nickel. And it might be that it's not intended for soldering either-- just CA or epoxy gluing-- some manufacturers have used tin compounds in the past for that. As I said before in my deleted post, it's not likely to be aluminum for a hobby application, which also can't readily be soldered with the equipment available to hobbyists. However, both Eduard and CMK have used nickel plated brass in the past. I've not seen any Aber PE that way, but that doesn't mean they haven't done it. As for filing a test piece-- brass may not readily look like brass on thinner plated parts.