3-1/2 Inch Duplex Stainless Steel Drill Casing
Seamless duplex stainless steel (e.g., 2205 grade) casing pipe with 3.5 inch (88.9 mm) OD and 9 mm wall thickness for high-pressure oil drilling. Classified in HTS 7304.24.40.10 as stainless steel casing under 215.9 mm OD with thin walls for oil/gas applications.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If sold as general purpose welded tubing
Welded or non-drilling specific tubes classify under 7306.30 for other hollow profiles.
If of iron or non-alloy steel
Casing of non-stainless steel materials falls under 7304.19 drill pipe headings.
If cut and threaded for fittings
Tube fittings or mechanical purposes shift to Chapter 73 fittings in 7307.19.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Include material grade certificates (e.g
• ASTM A790 for duplex) to substantiate stainless steel classification
• Avoid common pitfall of declaring as 'tubing' instead of 'casing' which could lead to 7306 headings
• For sets with couplings, declare as individual lengths unless permanently assembled per GRI 2(a)
Related Products under HTS 7304.24.40.10
3-1/2 Inch 25Cr Super 13Cr Casing
Seamless 25Cr super martensitic stainless casing, 3.5 inch OD, 9.5 mm wall thickness for CO2 injection wells. HTS 7304.24.40.10 due to stainless steel, small diameter, thin wall, and oil/gas drilling purpose.
API 5CT L80 Stainless Steel Oil Well Casing
Seamless stainless steel casing pipe meeting API 5CT L80 specifications, used to line oil and gas wells during drilling. It has an outside diameter under 215.9 mm and wall thickness less than 12.7 mm, classified under HTS 7304.24.40.10 as other stainless steel casing for drilling applications.
4.5 Inch OD 13Cr Stainless Steel Casing Tube
Seamless 13Cr (13% chromium) stainless steel tubing with 4.5 inch (114.3 mm) OD and wall thickness of 10 mm, designed for corrosive oil well environments. Falls under HTS 7304.24.40.10 due to its stainless steel composition, small diameter, and thin wall for oil/gas drilling casing.
5 Inch Super Duplex Casing for Gas Wells
Seamless super duplex stainless steel casing (e.g., 2507 grade) with 5 inch (127 mm) OD, 11 mm wall, for deep gas well lining in harsh conditions. HTS 7304.24.40.10 applies to its seamless stainless steel construction, small OD, and thin wall for drilling use.
4 Inch TP347H Stainless Steel Casing
Seamless TP347H high-temperature stainless steel casing with 4 inch (101.6 mm) OD and 10.5 mm wall for thermal recovery oil wells. Classified under HTS 7304.24.40.10 as stainless steel drilling casing with appropriate dimensions.
2-7/8 Inch Martensitic Stainless Casing Pipe
Seamless martensitic stainless steel (13Cr L80 type) pipe with 2.875 inch (73 mm) OD and 8 mm wall thickness, used as production casing in oil wells. Meets HTS 7304.24.40.10 criteria for stainless steel, OD <215.9 mm, wall <12.7 mm in drilling applications.