Scrap metal?

I get to work so late in the mornings that I have no hope of getting into the work's car park, so have to leave the car on a side street in the middle of the industrial estate. So every day I walk past various yards en route to the office; yards with all sorts of 'stuff' in them.
Including these neatly stacked bits of metal. I've no idea what they are/were.

I must try to get to bed earlier!