7307.99.50.60 - Of alloy steel (except stainless steel)

This HTS subcategory, 7307.99.50.60, specifically covers fittings for tubes and pipes made from alloy steel, excluding stainless steel. These fittings are essential components used to join, connect, or change the direction of iron or steel piping systems. Examples include elbows, tees, couplings, reducers, and flanges that are manufactured from alloy steel compositions designed to offer enhanced properties such as increased strength, hardness, or resistance to specific environmental factors, but do not meet the criteria for stainless steel classification.

It is crucial to distinguish this category from its sibling, "Of iron or nonalloy steel" (7307.99.50.10). The primary differentiator is the material composition. Fittings classified under this node must contain alloying elements beyond those found in plain iron or nonalloy steel, leading to distinct metallurgical properties. While both are pipe fittings of iron or steel and fall under the "Other" categories at higher levels, the presence and type of alloying elements dictate the correct classification here, impacting import duties and regulations.

As this node is a leaf node in the HTS, there are no further subcategories. Therefore, classification decisions within this code hinge on the precise determination of whether the article is a tube or pipe fitting of iron or steel, and specifically, if it is made of alloy steel that is *not* stainless steel. Proper identification of the material's chemical composition and its intended use as a fitting within a piping system are the key criteria for accurate classification.