7 inch Duplex Stainless Oilfield Tubing
Welded duplex stainless steel tubing (2205 grade), 7-inch diameter, for high-strength oil and gas production tubing strings. Classified in HTS 7306.21.80 as welded stainless tubing for drilling due to its corrosion-fatigue resistance in severe conditions. Used in extended reach drilling operations.
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More Specific Codes
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If seamless duplex stainless for drilling
Duplex stainless seamless variants classified under cold-drawn seamless headings.
If designated as drill pipe
Heavy-walled tubing functioning as drill pipe has separate oilfield classification.
If with integrated valves
Tubing assemblies with valves become control appliances under Chapter 84.
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Import Tips & Compliance
• Duplex grades require PREN (Pitting Resistance Equivalent) documentation above 35
• Specify 'tubing' vs 'casing' clearly in all paperwork to hit correct statistical breakouts
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