Can I use this in my boat? Framing question

[tonynoriega]

I found these hat shaped framing supports, that I believe were part of a "Costco" type backyard shed.

There is a number stamped on them, and am unsure if they will be corrosive or not...

I don't think they are aluminum, but maybe a stainless steel?

Anyone know by chance?

I did give it a magnet test, and it stuck.

They were only $1 for the bunch so nothing hurt if they wouldn't work.
I was thinking I could use them for the floor in my boat, I think they are about 6' long.

 

[dawgfish66]

Looks like galvanized steel to me... A magnet will stick to it and it won't rust except where the zinc coating is removed.

 

[tonynoriega]

So it should be ok, if I screw some of it to my benches, or the floor stringers?

No issues of corrosion from steel and aluminum touching?

 

[dawgfish66]

Nope, you are good to go....

 

[marshman]

wrong....

steel against aluminum is not advised...

that stuff will rust in no time....itll be fine for a couple years at best..

 

[Ranchero50]

I wouldn't use them as they are pretty flimsy, do a simple load test to see how much effort is required to bend one. The galvanizing is marginal for a shed and I expect they'll rust pretty quickly in a humid marine environment.