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HSChapter 73
U.S. imports of seamless iron or steel tubes & pipes, non-circular cross-section (HS 730490) totaled $962K in June 2026, traded with 24 countries.
Importers of Seamless Iron or Steel Tubes & Pipes, Non-Circular Cross-Section paid $440K in duties in June 2026 — an effective duty rate of 49% on $906K in dutiable value, based on actual customs collections rather than the published tariff schedule. Seamless Iron or Steel Tubes & Pipes, Non-Circular Cross-Section imports of $962K in June 2026 ran 14% above the year-to-date monthly average of $843K.
Non-circular cross-section seamless tubes — square, rectangular, oval, and other profiles — serve structural, architectural, and specialized mechanical applications where round pipe geometry is unsuitable. Unlike the heavily subdivided circular-section headings, the US schedule here organizes lines primarily by wall thickness (over 4 mm versus 4 mm or less) and by steel type (iron or nonalloy steel versus alloy steel), covering six 10-digit lines from 7304901000 through 7304907000. China and India are the leading suppliers, consistent with their broad seamless steel tube manufacturing capacity. Section 232 tariffs apply to all entries, and importers should confirm that non-circular profiles are not more specifically described elsewhere in Chapter 73 before using this residual heading.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Heading 730490 is limited to seamless products with non-circular cross-sections. Welded square or rectangular hollow structural sections (HSS) classify under heading 7306, not 7304. The manufacturing method — seamless versus welded — is the primary dividing line, and importers should obtain mill certifications confirming the production process to support the correct classification.
Goods of Canadian origin that meet USMCA rules of origin may qualify for preferential tariff treatment under that agreement. However, Section 232 tariffs on steel products have been applied separately from MFN duties, and their interaction with USMCA preference claims has been subject to specific Commerce Department and CBP guidance. Importers should consult a licensed customs broker to confirm the current treatment of Canadian-origin seamless steel tubes under both USMCA and any applicable Section 232 measures.
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OTH TBS PS HLW PFL SMLS NT CIRC CS ALLOY STEEL
HS 7304906000
TUBES ETC SMLS NES NONCIRC CS OV 4MM THCK ALLOY ST
HS 7304903000
OTH TBS PS HLW PFL SMLS NT CIRC CS IRN O NAL STL
HS 7304904000
TUBES ETC SMLS NES NONCIRC CS 4MM THCK OR LS ALSTL
HS 7304907000
TUBES ETC SMLS NES NONCIRC CS 4MM THCK OR LS I/NAS
HS 7304905000
Monthly import values over time
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 7304903000 | TUBES ETC SMLS NES NONCIRC CS OV 4MM THCK ALLOY ST | $625K | 46.55% | 92.04% | $291K |
| 7304907000 | TUBES ETC SMLS NES NONCIRC CS 4MM THCK OR LS ALSTL | $253K | 43.85% | 98.53% | $111K |
| 7304905000 | TUBES ETC SMLS NES NONCIRC CS 4MM THCK OR LS I/NAS | $72K | 48.23% | 100.00% | $35K |
| 7304901000 | TUBES ETC SMLS NES NONCIRC CS OV 4MM THCK IR/NALST | $11K | 27.76% | 81.27% | $3K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7304906000 | OTH TBS PS HLW PFL SMLS NT CIRC CS ALLOY STEEL | $866K |
| 7304904000 | OTH TBS PS HLW PFL SMLS NT CIRC CS IRN O NAL STL | $326K |
ARTICLES OF IRON OR STEEL NESOI
HS 732690
STRUCTURES AND PARTS NESOI OF IRON OR STEEL
HS 730890
THREADED SCREWS AND BOLTS NESOI OF IRON OR STEEL
HS 731815
TOWERS AND LATTICE MASTS OF IRON OR STEEL
HS 730820
COOKING APPLIANCES ETC FOR GAS FUEL, IRON OR STEEL
HS 732111
TABLE, KITCHEN ETC ARTICLES & PTS, STAINLESS STEEL
HS 732393
| State | Imports | Exports | Balance |
|---|---|---|---|
| Texas | $340K | $76K | -$264K |
| Pennsylvania | $144K | $130K | -$14K |
| Connecticut | -- | $264K | +$264K |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| HOUSTON INTERCONTINENTAL AIRPORT, TX | $297K | -- | -$297K |
| NEWARK, NJ | $117K | $63K | -$53K |
| LOGAN AIRPORT, MA | -- | $145K | +$145K |