20-Inch Conductor Casing Pipe
Extra-large welded nonalloy steel conductor casing with 20-inch external diameter (>406.4 mm), installed first in offshore/onshore drilling to support initial borehole and resist high loads. HTS 7305.20.4000 covers this as 'other' iron/nonalloy steel casing for oil/gas drilling. Built for structural integrity in surface sections.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for structural piling use
If marketed for foundation piling rather than drilling, reclassifies under welded tubes for construction.
If seamless conductor type
Seamless variants specifically for drilling go to 7304.19 casing subheading.
If stainless steel conductor
Alloy steel (stainless) conductor casing uses 7305.29 series.
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Import Tips & Compliance
• Include hydrostatic test certificates showing pressure ratings to prove drilling end-use
• For bulk shipments, ensure container loading plans account for 20+ ft lengths to prevent damage claims
Related Products under HTS 7305.20.40.00
16-Inch OD Welded Oil Well Casing
Heavy-duty welded casing tube of nonalloy steel with 16-inch (406.4+ mm) external diameter, used in oil drilling to prevent borehole collapse and protect aquifers. Falls under HTS 7305.20.4000 as 'other' non-seamless casing for drilling applications. Features high collapse resistance for intermediate casing strings.
18.5-Inch Surface Casing Tube
Welded surface casing pipe of iron/nonalloy steel, 18.5-inch OD exceeding 406.4 mm, used in gas well drilling to isolate freshwater zones and provide blowout protection. Fits HTS 7305.20.4000 as other non-seamless casing for drilling. Corrosion-resistant coating standard for longevity.
ASTM A252 Grade 2 Drilling Casing
Welded ASTM A252 Grade 2 steel casing pipe with circular cross section over 16 inches (406.4 mm) OD, for oilfield drilling to line wells and support formations. HTS 7305.20.4000 applies to this nonalloy 'other' casing, distinguished by electric resistance welding (ERW). Ideal for intermediate and production casing.
22-Inch OD ERW Oil Casing Pipe
Electric resistance welded (ERW) casing pipe of nonalloy steel, 22-inch external diameter, for stabilizing oil well bores during drilling. Classified in HTS 7305.20.4000 as other riveted/welded casing over 406.4 mm for oil/gas. High yield strength for deep wells.
Nonalloy Steel Production Casing
Welded production casing strings of nonalloy steel, OD >16 inches, used post-drilling to facilitate oil/gas flow while isolating zones. HTS 7305.20.4000 for other non-seamless iron/steel casing in drilling. Premium grade for long-term well integrity.
17-Inch Intermediate Casing Pipe
17-inch OD welded intermediate casing of nonalloy steel for multi-stage oil drilling support. HTS 7305.20.4000 classification.