U.S. imports of Parts for Steam or Other Vapor Generating Boilers (SITC 71191) totaled $45.7M in August 2026, imported from 35 countries.
Importers of Parts for Steam or Other Vapor Generating Boilers paid $7.2M in duties in August 2026, an average duty rate of 15.69% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Parts for Steam or Other Vapor Generating Boilers imports of $45.7M in August 2026 ran 34% above the year-to-date monthly average of $34.2M.
Last updated: August 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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356 import shipments a month
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.
Basic heading 237 of 642 in section 7
Basic heading 71191 · $45.7M of $172.0B
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Imports · August 2026
origin
Vietnam and South Korea together supply 70% of it. China pays 39.7% duty; Italy 0.4%.
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
$45.7MYoY · free account
Exports
$7.0MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $308.5M of Parts for Steam or Other Vapor Generating Boilers.
Through August 2026 · exports 10 of 12 months reported. Source: U.S. Census Bureau.