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SITCSection 7
U.S. imports of parts for steam or other vapor generating boilers (SITC 71191) totaled $83.4M in July 2026, traded with 33 countries.
Importers of Parts for Steam or Other Vapor Generating Boilers paid $11.4M in duties in July 2026 — an effective duty rate of 13% on $87.5M in dutiable value, based on actual customs collections rather than the published tariff schedule. Parts for Steam or Other Vapor Generating Boilers imports of $83.4M in July 2026 ran 157% above the year-to-date monthly average of $32.5M.
Last updated: July 2026 dataReplacement and OEM parts for steam and vapor generating boilers—including tubes, headers, drums, grates, and burner components—serve the power generation, petrochemical, and pulp-and-paper industries. Classification as a boiler part rather than as a finished boiler or a general industrial component requires demonstrating that the article is identifiable as suitable for use solely or principally with a vapor-generating boiler. Steel and cast-iron content in many of these parts means Section 232 tariff exposure is a recurring cost consideration for procurement teams.
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365 shipments/mo
Basic heading 177 of 642 in section 7
Basic heading 71191 · $83.4M of $175.6B
Technical drawings, OEM part numbers, manufacturer declarations, and purchase orders referencing the specific boiler model all help establish principal use. CBP may also consider whether the part is marketed exclusively for boiler applications. A binding ruling is advisable for high-volume or high-value part imports where classification is ambiguous.
Boiler tubes that are clearly identifiable by their specifications (wall thickness, alloy grade, and end-finishing) as suitable for use in steam generators are generally classified as boiler parts rather than as steel tubes. However, generic seamless or welded tubes that could serve multiple industrial purposes may be classified under steel tube headings instead. The specific dimensions and alloy certifications on the mill certificate are key to making this determination.
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Imports · July 2026
origin
Korea, South and Vietnam together supply 78% of it.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$83.4MYoY · Pro
Exports
$5.9MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.