Harmonized System
U.S. exports of Seamless Iron or Steel Tubes & Pipes, Non-Circular Cross-Section (HS 730490) totaled $1.5M in August 2026.
Importers of Seamless Iron or Steel Tubes & Pipes, Non-Circular Cross-Section paid $343K in duties in August 2026, an average duty rate of 52.31% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Seamless Iron or Steel Tubes & Pipes, Non-Circular Cross-Section imports of $659K in August 2026 ran 18% below the year-to-date monthly average of $808K.
Last updated: August 2026 dataNon-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.
41 import shipments a month
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.
ImportsExports
Imports
$659KYoY · free account
Exports
$1.5MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $10.0M of Seamless Iron or Steel Tubes & Pipes, Non-Circular Cross-Section and exported $18.9M.
Through August 2026. Source: U.S. Census Bureau.
Subheading 12 of 13 in heading 7304
Subheading 730490 · $1.5M of $54.3M
Trade Directory
List your company under HS 730490 — Seamless Iron or Steel Tubes & Pipes, Non-Circular Cross-Section, so the companies trading it can find you. Be the first supplier listed.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 7304903000 | Tubes Etc Smls Nes Noncirc Cs Ov 4mm Thck Alloy St | $320K | 57.74% | 100.00% | $185K |
| 7304907000 | Tubes Etc Smls Nes Noncirc Cs 4mm Thck or Ls Alstl | $163K | 38.41% | 97.53% | $62K |
| 7304901000 | Tubes Etc Smls Nes Noncirc Cs Ov 4mm Thck Ir/Nalst | $99K | 55.73% | 100.00% | $55K |
| 7304905000 | Tubes Etc Smls Nes Noncirc Cs 4mm Thck or Ls I/Nas | $75K | 54.77% | 100.00% | $41K |
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 | $864K |
| 7304904000 | Oth Tbs Ps Hlw Pfl Smls Nt Circ Cs Irn O Nal Stl | $589K |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Exports · August 2026
destination
Mexico and Canada together take 46% of it.
customs district
entry
rate provision · imports
0.6% enters free of duty; duty collected equals 52.31% of imports for consumption.