12-1/4 inch Super Duplex Casing
Seamless super duplex 2507 stainless casing with 12.25 inch OD and 11.2 mm wall thickness for extreme corrosion environments in oil/gas drilling. Classified in HTS 7304.24.4050 for stainless steel seamless casing within size limits.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If wall thickness 12.7 mm or more
Thicker wall versions of identical casing shift to adjacent thickness subheading.
If longitudinally submerged arc welded
LSAW welded stainless casing moves to welded pipe heading 7306.50.
If sold as complete drill string set
Assembled drill strings with casing classify as drilling rigs under 8430.
Not sure which classification is right?
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Import Tips & Compliance
• Include chemical composition analysis proving super duplex stainless steel alloy content
• Declare exact wall thickness measurement method (ultrasonic testing preferred)
• Separate threaded vs plain end casing; threading may affect accessory classification
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