13-3/8 Inch 13Cr Alloy Steel Sour Service Casing
Seamless 13Cr (13% chromium) alloy steel casing optimized for sour (H2S) environments in oil drilling, 339.7 mm OD and 10.92 mm wall thickness. Meets HTS 7304.29.4150 criteria for other alloy steel seamless casing used in oil/gas drilling with OD 285.8-406.4 mm and wall <12.7 mm.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for smaller OD under 285.8 mm
Narrower diameter casings fall into preceding OD size bands in the same thin-wall category.
If considered unfinished hollow bar rather than finished casing
Less processed alloy steel hollow products classify under Chapter 72 semifinished bars.
If threaded and coupled as finished pipe fitting
Fully assembled threaded casing with couplings may shift to tube/pipe fitting headings.
Not sure which classification is right?
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Import Tips & Compliance
• Include NACE MR0175/ISO 15156 certification for sour service to support alloy classification and duty assessment
• Measure and document wall thickness precisely; values approaching 12.7 mm risk upward reclassification
• Avoid common pitfall of generic 'steel pipe' descriptions—specify 'oil well casing, alloy steel, seamless' on all docs
Related Products under HTS 7304.29.41.50
API 5CT L80 Alloy Steel Oil Well Casing
Seamless L80 grade alloy steel casing pipe used in oil and gas drilling operations, with an outside diameter of 339.7 mm and wall thickness of 10.5 mm. Classified under HTS 7304.29.4150 due to its seamless construction from alloy steel, specific OD range exceeding 285.8 mm but not over 406.4 mm, and wall thickness under 12.7 mm for oilfield casing applications.
9-5/8 Inch P110 Alloy Casing for Gas Wells
Seamless P110 high-strength alloy steel casing with 9-5/8 inch (244.5 mm OD, but model variant at 355.6 mm OD with 11.2 mm wall) designed for high-pressure gas well applications in drilling operations. Fits HTS 7304.29.4150 as other alloy steel seamless casing in the 285.8-406.4 mm OD range with thin wall under 12.7 mm.
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Seamless Q125 quasi-premium alloy steel casing with 355.6 mm OD and 11.1 mm wall, engineered for high collapse resistance in deep oil wells. Classified in HTS 7304.29.4150 for its seamless alloy steel construction as drilling casing in the specified OD and thin-wall parameters.
12-3/4 Inch T95 Alloy Steel Casing
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