13-3/8 Inch 13Cr Alloy Steel Sour Service Casing from China
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.
Duty Rate — China → United States
35%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
9903.91.0125%Effective with respect to entries on or after September 27, 2024, articles the product of China, as provided for in subdivision (b) of U.S. note 31 to this subchapter
Import Tips
• 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