4-1/2 inch N80-1 Casing Pipe
Seamless N80-1 alloy steel casing with 4-1/2 inch OD, threaded and coupled with premium EUE connections for shallow oil production wells. Wall thickness less than 12.7 mm provides optimal strength-to-weight ratio for liner applications. Classified in 7304.29.31.10 for its seamless alloy steel construction and drilling-specific design.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If not threaded or coupled
Plain end casing without threads/couplings classified in 7304.29.10 rather than .31.
If imported in coiled tubing form
Coiled tubing for well intervention, though similar use, classified under other hollow profiles.
If threaded at both ends for structural use
Structural steel tubes/pipes with threads classify under 7307, not oilfield casing.
Not sure which classification is right?
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Import Tips & Compliance
• Ensure marking includes API grade, size, and seamless designation per API Spec 5CT
• Provide collapse and burst test data from MTC for customs valuation support
• Avoid common pitfall of declaring as 'line pipe' which changes classification to 7304.90
Related Products under HTS 7304.29.31.10
API 5CT L80 Type 9 Casing Pipe
Seamless alloy steel casing pipe manufactured to API 5CT L80 Type 9 specifications for oil and gas drilling, with threaded connections and coupled ends. Features outside diameter under 215.9 mm and wall thickness less than 12.7 mm, designed for corrosive environments in downhole applications. Classified under 7304.29.31.10 due to its seamless construction, alloy steel composition, and specific dimensions for oil/gas casing.
7-inch P110 Casing with BTC Coupling
Seamless P110 grade alloy steel casing pipe, 7-inch OD with Buttress Threaded and Coupled (BTC) connections for high-pressure oil well applications. Wall thickness under 12.7 mm suitable for intermediate casing strings in directional drilling. Meets 7304.29.31.10 criteria as threaded/coupled seamless alloy steel casing under 215.9 mm OD.
5-1/2 inch L80-9CR Casing
9% Chromium L80-9CR seamless casing pipe, 5-1/2 inch OD with wall thickness under 12.7 mm, featuring VAM TOP threaded and coupled connections. Designed for sour service (H2S) environments in gas wells. Falls under HTS 7304.29.31.10 as other alloy steel seamless casing for drilling operations.
3-1/2 inch T95 Casing with STC Threads
High-strength T95 seamless alloy steel casing, 3-1/2 inch OD, Surface Thread Casing (STC) connections, wall thickness <12.7 mm for tie-back and shallow conductor applications. Provides collapse resistance in unconsolidated formations. HTS 7304.29.31.10 classification for threaded/coupled oil/gas casing.
6-5/8 inch Q125 Casing Pipe
Quench and Tempered Q125 grade seamless casing, 6-5/8 inch OD with 12.7 mm wall or less, premium threaded and coupled for ultra-high pressure HP/HT wells. Used as intermediate casing in deepwater applications. Classified 7304.29.31.10 for seamless alloy steel drilling casing dimensions.
2-3/8 inch J55 EUE Casing
J55 grade seamless casing 2-3/8 inch OD with External Upset Ends (EUE) 8-round threads and couplings for low-pressure oil production tubing/casing applications. Wall <12.7 mm suitable for shallow wells. 7304.29.31.10 for small diameter threaded alloy steel casing.