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HSChapter 73
U.S. imports of large-diameter oil & gas drilling casing, iron or steel (over 16 in.) (HS 730520) totaled $392K in April 2026, traded with 4 countries.
Importers of Large-Diameter Oil & Gas Drilling Casing, Iron or Steel (Over 16 In.) paid $284K in duties in April 2026 — an effective duty rate of 37% on $763K in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataSubject to Section 232 tariffs on steel imports, large-diameter casing with an external diameter exceeding 406.4 mm is a specialized product used in deep and offshore oil and gas well construction where standard OCTG sizes are insufficient. The US schedule subdivides this heading by threading configuration and alloy content, with tariff lines 7305202000 and 7305206000 covering threaded variants in non-alloy and alloy steel respectively, while 7305203000, 7305204000, and 7305207000 address non-seamless circular cross-section and other configurations. The United Kingdom and Brazil are leading suppliers, with South Korea, Japan, and Germany also contributing meaningfully to US import volumes.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
The heading splits primarily by alloy type and threading: 7305202000 covers threaded non-alloy steel casing, 7305206000 covers threaded alloy steel casing, while 7305203000 and 7305207000 address non-seamless circular cross-section variants in non-alloy and alloy steel respectively, and 7305204000 captures remaining configurations not elsewhere specified.
Yes. Iron and steel pipe and tube products, including large-diameter casing, are broadly subject to Section 232 tariffs. Importers should also check for any applicable antidumping or countervailing duty orders specific to the country of origin, as these can apply independently of Section 232 measures.
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Monthly import values over time
| Country | Imports | Exports | Balance |
|---|---|---|---|
| UNITED KINGDOM | $392K | -- | -$392K |
| CANADA | -- | $131K | +$131K |
| EL SALVADOR | -- | -- | -- |
| GERMANY | -- | -- | -- |
| NAMIBIA | -- | -- | -- |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 7305204000 | CASING OIL/GAS DRILL IRN/STL,DIAM GT 406.4MM,NESOI | $392K | 37.16% | $284K |
| 7305202000 | CASING OIL/GAS DRILLNG,I/S,THREAD,GT 406.4MM DI | $0 | -- | -- |
CASING OIL/GAS DRILL IRN/STL,DIAM GT 406.4MM,NESOI
CASING OIL/GAS DRILLNG,I/S,THREAD,GT 406.4MM DI
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7305207000 | CSNG O/G DRL NT SMLS CIRC CS DIA 0406.4MM ALY STL | $131K |
| 7305203000 | CSNG O/G DRL NT SMLS CIRC CS DIA O406.4MM IOS NA | $0 |
CSNG O/G DRL NT SMLS CIRC CS DIA 0406.4MM ALY STL
11.3K kg
CSNG O/G DRL NT SMLS CIRC CS DIA O406.4MM IOS NA
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
COOKING APPLIANCES ETC FOR GAS FUEL, IRON OR STEEL
HS 732111
NUTS OF IRON OR STEEL
HS 731816
TABLE, KITCHEN ETC ARTICLES & PTS, STAINLESS STEEL
HS 732393
| Port | Imports | Exports | Balance |
|---|---|---|---|
| HOUSTON, TX | $372K | -- | -$372K |
| PORT HURON, MI | -- | $131K | +$131K |
| HOUSTON INTERCONTINENTAL AIRPORT, TX | $20K | -- | -$20K |