Iron rusts easily when combined with water, and drain pipes have water flowing through them. If iron was used, the pipes would rust within a few days.
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galvanized water lines, cast iron drain lines, sometimes lead pipes, terracotta or clay pipes, and in rare cases wooden pipes.
cast iron
galvanized iron pipes commonly used on water pipe lines, it is dipped into zinc for corrosion protection
Pvc pipes are cheaper. They are easier to join. They last longer.
Ductile Iron Pipes