3-1/2 inch Super Duplex Tubing
Welded super duplex stainless (2507 grade) tubing, 3-1/2 inch, for ultra-corrosive oil/gas wells with high chloride content. HTS 7306.21.80 covers this welded stainless product designed explicitly for drilling tubing applications. Maximizes uptime in subsea completions.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If other alloy steel welded tubing
Special stainless grades sometimes classified by detailed alloy composition.
If seamless and over 114.3mm OD
Larger diameter seamless oilfield tubing has distinct statistical numbering.
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Import Tips & Compliance
• Super duplex requires ferrite content verification (40-60%) in material certs
• Use threaded-and-coupled (T&C) descriptions accurately for connection type
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