Alloy Steel Superheater Tube ASTM A312 TP310S from Japan
Welded circular tube of TP310S alloy steel per ASTM A312, wall thickness 1.65 mm or more, optimized for superheater sections in fossil fuel power plants. High-temperature oxidation resistance makes it ideal for steam superheating. Covered by 7306.50.5010 for welded alloy tubes in superheaters.
Duty Rate — Japan → 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
• ASME or ASTM certification mandatory; lack thereof leads to general tube classification
• Specify 'for superheater service' in commercial invoice to support tariff shift
• Avoid bundling with dissimilar tubes; mixed shipments complicate verification