rusty
cast, corrugated, galvanized, wrought
a hut with a corrugated iron roof

pig
scrap

make, produce, smelt
Germany produced enormous quantities of coal, iron and steel.

be rich in, contain
foods that are rich in iron

be cast in, be made from/of/out of
a bridge made of wrought iron

rust

ore
They mine iron ore locally.

bar
gate
filings
industry
foundry, works
deficiency
patients with iron deficiency

pill (esp. AmE), tablets (esp. BrE)
I was put on iron tablets for my anaemia.

hot, warm
electric, steam
travel (BrE)
curling (= for making hair curly), flat (= for making hair straight)
You can use a curling iron to create soft curls.

use
Use a cool iron on synthetics.