Alloy Steel Oil Well Casing Pipe 16-inch OD
Welded alloy steel casing pipe with a 16-inch (406.4 mm) external diameter, designed for oil and gas drilling operations to line and stabilize boreholes. It falls under HTS 7305.20.80.00 as it is other casing of alloy steel with circular cross-section exceeding 406.4 mm OD, not specified elsewhere. These pipes are typically used in deep well applications requiring high strength and corrosion resistance.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If seamless construction
Seamless tubes and pipes of alloy steel fall under Chapter 73 heading 7304, regardless of diameter or end use.
If used as line pipe for oil/gas transport
Line pipe for conveyance of oil/gas, even if welded and large diameter, classifies under 7306 based on primary transport function rather than drilling casing.
If made of stainless steel alloy
Stainless steel variants shift to 7305.11 due to specific material provisions distinguishing stainless from other alloy steels.
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Import Tips & Compliance
• Verify alloy steel composition meets ASTM A335 or API 5CT standards with mill test certificates to ensure classification under 7305.20.80.00
• Provide drilling end-use documentation like purchase orders to avoid misclassification as general line pipe
• Confirm external diameter exceeds 406.4 mm via precise measurements to prevent reclassification to smaller diameter headings
Related Products under HTS 7305.20.80.00
API 5CT T95 Alloy Casing for Deep Gas Wells
High-grade T95 alloy steel casing compliant with API 5CT standards, featuring 18-inch OD for deep gas well drilling to protect against collapse and corrosion. Classified under HTS 7305.20.80.00 for its welded construction, alloy steel material, and large circular cross-section exceeding 406.4 mm used specifically in drilling. Essential for high-pressure environments in unconventional gas extraction.
20-inch OD Alloy Steel Drilling Casing with BTC Threads
Welded alloy steel casing pipe, 20-inch external diameter with Buttress Threaded and Coupled (BTC) connections, used to case oil wells during rotary drilling. Meets HTS 7305.20.80.00 criteria as other large-diameter (>406.4 mm) alloy steel casing for oil/gas drilling applications. Provides structural integrity in deviated and horizontal wells.
Alloy Steel Surface Casing for Offshore Oil Rigs
Heavy-walled welded alloy steel surface casing with 24-inch OD, deployed in offshore oil drilling to seal the upper borehole sections against formation fluids. Falls under HTS 7305.20.80.00 as other alloy steel casing exceeding 406.4 mm diameter for drilling operations. Corrosion-resistant alloy suitable for marine environments.
17.5-inch Alloy Casing for Horizontal Shale Drilling
Welded alloy steel intermediate casing, 17.5-inch OD, optimized for extended reach horizontal drilling in shale formations like Permian Basin wells. Classified in HTS 7305.20.80.00 for its large circular cross-section, alloy composition, and specific oil/gas drilling casing function. Features premium connections for high torque applications.
22-inch Conductor Alloy Steel Casing Pipe
Extra-large 22-inch OD welded alloy steel conductor casing for initial borehole support in oil and gas wells, preventing cave-ins during drilling start-up. HTS 7305.20.80.00 applies to this other alloy steel casing with diameter >406.4 mm specifically for drilling. High collapse resistance for unconsolidated formations.