5-1/2 Inch L80-9CR Threaded Casing
5-1/2 inch L80-9CR restricted alloy casing threaded for sour gas service wells. While containing chromium, classified as nonalloy base with restrictions under 7306.29.10.90 when meeting criteria. Welded for drilling applications.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If exceeding restricted alloy limits
Higher Cr content pushes to low-alloy steel subheadings.
If full stainless steel grades
True stainless (12%+ Cr) uses stainless steel casing headings.
If seamless sour service tubing
Seamless restricted yield tubing under 7304 for smaller diameters.
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Import Tips & Compliance
• 9CR alloys require HIC/SSC test certificates for sour service compliance
• Chemical analysis must show exact Cr/Ni/Mo to verify nonalloy/restricted status
• NACE standards documentation prevents reclassification as higher alloy
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