TP321 Stainless Steel Seamless Pipe 4-inch NPS
Seamless TP321 stainless steel pipe, 4-inch nominal pipe size, for high-temperature chemical processing with circular cross section. Falls under HTS 7304.49.00 as other seamless stainless pipes not cold-worked or for specific exclusions like boilers. Ideal for corrosive environments due to stabilized alloy.
Import Duty Rates by Country of Origin
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for boiler, superheater, or heat exchanger use
Specialized end-use seamless stainless tubes shift to 7304.41.10.
If threaded or with fittings attached
Pipe fittings or threaded assemblies classify under 7307, not plain tubes.
If of iron or non-alloy steel
Material change to non-stainless moves to 7304.29 for other seamless pipes.
Not sure which classification is right?
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Import Tips & Compliance
• Submit ASTM A312 compliance cert confirming seamless and grade TP321 for accurate duty assessment
• For large diameters, provide pressure rating docs to rule out boiler tube classification
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