Steel is an alloy which mainly contains iron. Carbon is the most common and important additive. Alloys with high content of carbon is called cast iron.
Cast iron contains 2-4% carbon and can be very brittle. In the yacht industry you can find keels and engines made in cast iron.
Cast iron should be treated as “normal” steel and need a good preparation and a rust barrier in the form of a 2-pack or 1 –pack primer.
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