7325.10.00 - Of nonmalleable cast iron

This category encompasses cast articles of iron or steel that are specifically made from nonmalleable cast iron. Nonmalleable cast iron, often referred to as gray iron, is characterized by its brittle nature and the presence of graphite in flake form, which prevents it from being deformed without fracturing. Articles within this classification are typically manufactured by pouring molten nonmalleable cast iron into a mold. The resulting products are generally used for their strength, rigidity, and resistance to wear and corrosion, but are not intended for applications requiring ductility or malleability.

Within the broader context of "Other cast articles of iron or steel," this specific subheading distinguishes itself by the explicit material requirement of nonmalleable cast iron. While other categories at the same level might cover articles of malleable cast iron or cast steel, the defining characteristic here is the unique metallurgical properties of nonmalleable cast iron. This distinction is crucial for accurate tariff application, as the manufacturing processes and end-use applications can differ based on the type of cast iron employed.

This HTS code serves as a parent category for a range of specific cast articles made from nonmalleable cast iron. The subcategories detail common applications, including manhole covers, rings and frames, catch basins and grates, cleanout covers and frames, and valve and service boxes. These subdivisions acknowledge the prevalent use of nonmalleable cast iron in infrastructure and utility components due to its durability and cost-effectiveness. An "Other" subcategory is also provided to capture any remaining nonmalleable cast iron articles not specifically enumerated.