Duplex Stainless Steel 18-inch Welded Pipe
Duplex 2205 stainless steel longitudinally welded pipe, 457 mm OD, high strength for subsea oil/gas flowlines. HTS 7305.31.60.10 classification for large welded stainless tubes.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If other large welded steel
Non-alloy/non-stainless large pipes use general 7305.31.90.
If parts of oilfield machinery
Machinery-specific parts classified with equipment in 8431.
If cut and threaded ends
Pipe fittings/tube fittings classification applies.
Not sure which classification is right?
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Import Tips & Compliance
• PREN value (pitting resistance) certification ≥35 for duplex verification
• Weld procedure qualification record (WPQR) required for pressure piping
• Magnetic permeability test confirms duplex microstructure vs austenitic
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