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HSChapter 73
U.S. imports of iron & non-stainless steel pipe flanges (HS 730791) totaled $31.3M in April 2026, traded with 38 countries.
Last updated: April 2026 dataFlanges of iron, nonalloy steel, and non-stainless alloy steel are widely used in oil-and-gas, petrochemical, and industrial piping systems to join pipe sections and connect equipment. The US tariff schedule subdivides this heading by alloy composition and machining/processing status, with inside-diameter thresholds at 360 mm creating additional classification breakpoints across eight 10-digit lines. India leads US supply under this heading, followed by China and South Korea, making these imports broadly subject to Section 232 steel tariffs as well as potential Section 301 exposure on Chinese-origin goods. Importers should confirm whether flanges arrive in a machined, tooled, or processed state, as that distinction directly determines the applicable HTS line.
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The US schedule splits non-stainless flanges into lines covering inside diameters less than 360 mm and those 360 mm or greater. Importers must measure the bore accurately before filing entry, because misclassification between these size brackets can trigger different duty rates and antidumping exposure.
India is the leading supplier of flanges under this heading. While Indian steel articles are generally subject to Section 232 tariffs, importers should also check whether any antidumping or countervailing duty orders specifically cover the flange type and alloy grade being imported, as coverage varies by product specification.
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Monthly import values over time