ASTM A335 P91 Large Diameter Boiler Pipe from Japan
Seamless Grade P91 chrome-moly alloy steel pipe for elevated-temperature service in refining furnaces and supercritical boilers, with 508 mm OD. It provides excellent creep resistance for high-pressure feedwater heaters. Falls under 7304.59.20.80 as other alloy steel seamless tubes over 406.4 mm OD suitable for boilers and refining furnaces.
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 of aluminum, of steel or of copper or derivative aluminum or steel articles; passenger vehicles (sedans, sport utility vehicles, crossover utility vehicles, minivans and cargo vans) and light trucks; parts of passenger vehicles (sedans, sport utility vehicles, crossover utility vehicles, minivans and cargo vans) and light trucks; medium- and heavy-duty vehicles; parts of medium- and heavy-duty vehicles; wood products; patented pharmaceutical articles; and semiconductor articles, as provided in subdivision (f) of U.S. note 52 to this subchapter
Import Tips
• Provide hydrotest and nondestructive electric test (NDT) certificates as required for P91 grade to prove pressure integrity
• Declare exact alloy elements (9% Cr, 1% Mo) in entry docs; mismatches lead to duty reassessment or penalties
• Avoid bundling with fittings; ship as individual lengths to prevent set classification under 7307 or 7308