C-90 Sour Service Casing 12-1/4 inch 45 lb/ft from Canada
C-90 grade seamless casing optimized for H2S sour service environments in gas wells, 311.2 mm OD. Nonalloy steel with controlled hardness to prevent cracking. Fits 7304.29.50.60 as oil/gas seamless tubing in diameter range.
Duty Rate — Canada → United States
50%
Rate breakdown
9903.82.0250%Except as provided for in headings 9903.82.14, 9903.85.67 and 9903.85.68, articles of aluminum, of steel or of copper and derivative aluminum or steel articles, as provided for in subdivisions (c)(i)–(v) of U.S. note 16 to this subchapter
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• Certify NACE MR0175 compliance for sour service to support drilling classification
• Mark premium class threads distinctly from API regular