4 inch OD Alloy Steel Oil Well Casing Pipe
Seamless alloy steel casing pipe with 4 inch (101.6 mm) outside diameter and 9.2 mm wall thickness, used to line oil and gas wells during drilling. Premium grade P110 alloy steel for high-pressure environments. Classified in 7304.23.6030 for seamless alloy steel OD ≤168.3 mm, wall ≤9.5 mm.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If outside diameter exceeds 168.3 mm but ≤219.1 mm
Casing with 6-5/8 to 8-5/8 inch OD uses different statistical suffix
If welded rather than seamless construction
Welded alloy steel casing classifies under Chapter 73 welded tubes heading
If carbon steel construction instead of alloy
Non-alloy steel casing uses carbon steel subheadings 7304.59
Not sure which classification is right?
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Import Tips & Compliance
• Provide ITP (Inspection Test Plan) and third-party inspection reports (SGS/BV)
• Specify if BTC, STC, or premium connections; connection type affects valuation
• Avoid classifying as line pipe (7304.90) - must prove drilling well use via end user declaration
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