7307.93.90.60 - Of alloy steel (except stainless steel)

This HTS category, "Of alloy steel (except stainless steel)," encompasses fittings for tubes and pipes made from iron or steel, specifically those classified under the broader heading 7307. The defining characteristic here is the material composition. These fittings are manufactured from alloy steel, which means the steel contains alloying elements beyond carbon, such as chromium, nickel, molybdenum, or vanadium, to enhance specific properties. However, the crucial exclusion is stainless steel, meaning fittings made with a significant chromium content (typically 10.5% or more) that renders them resistant to corrosion are classified elsewhere.

The distinction from the sibling category, "Of iron or nonalloy steel," is primarily based on the material's metallurgical composition. Fittings classified under "Of iron or nonalloy steel" are made from materials that are either predominantly iron with minimal alloying elements or are considered basic steel without significant additions of other metals to alter their properties. Conversely, this category specifically targets alloy steel where such additions are present, but only if those additions do not qualify the steel as stainless.

As this is a leaf node in the HTS classification, there are no further subcategories. Therefore, the focus for classification within this node lies on confirming the material is indeed alloy steel (but not stainless steel) and that the fitting serves the purpose of connecting or terminating tubes and pipes, fitting the criteria of heading 7307 and its preceding subheadings, such as being butt welding fittings with an inside diameter of 360 mm or more. Examples of fittings that would fall here include elbows, tees, reducers, and flanges made from alloy steels like chromium-molybdenum steel or nickel alloy steel used in high-pressure or high-temperature industrial applications, where the specific properties of alloy steel are required but the corrosion resistance of stainless steel is not the primary consideration.