Nonmalleable (gray) cast iron fittings fracture rather than deform under stress and are produced by a standard sand-casting process without annealing. Malleable cast iron fittings undergo a heat-treatment (annealing) step that imparts ductility. This manufacturing distinction drives separate SITC classifications and can also determine which antidumping orders apply.

Yes. Cast iron pipe fittings, including nonmalleable gray iron types, have been subject to longstanding antidumping duty orders from several origins. Importers should check the Commerce Department's active order list and obtain scope rulings when product specifications are borderline, as scope determinations for cast iron fittings have been litigated extensively.