13-3/8 inch 72# L-80 Type 13Cr Casing
Seamless alloy steel oil well casing pipe with 13-3/8 inch OD (339.7 mm adjusted to hierarchy range), 72 lb/ft weight, L-80 grade with 13% chromium content for corrosion resistance in sour gas environments. Features API STC threaded couplings and wall thickness exceeding 12.7 mm, designed for oil and gas drilling casing strings. Classified under 7304.29.31.40 due to its seamless construction, alloy steel composition, coupled ends, and specified dimensions for heavy-duty downhole use.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If having wall thickness less than 12.7 mm
Thinner wall casings fall into other subheadings within the same casing category based on thickness specifications.
If supplied without threads or couplings
Uncoupled or plain-end seamless casing is classified under other seamless steel tube headings outside the threaded/coupled casing provisions.
If made of stainless steel rather than other alloy steel
Stainless steel variants shift to the stainless-specific subheading within Chapter 73 for oil/gas casing.
Not sure which classification is right?
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Import Tips & Compliance
• Verify API 5CT certification and exact wall thickness measurements to confirm HTS classification; provide mill test certificates (MTC) showing alloy composition
• Ensure couplings meet API STC standards to avoid reclassification as uncoupled tubing
• Watch for anti-dumping duties on Chinese-origin seamless pipes
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