Seamless Steel Fin-Tube Base OD 30mm
Plain seamless tube OD 30mm serving as base for aluminum finned heat exchanger tubes in air preheaters. Under HTS 7304.39.0002 for nonalloy steel seamless circular form suitable for heat exchangers, prior to fin attachment. Provides structural core for extended surface exchangers.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported with temporary fins
Tubes/pipes fitted with attachments classify differently in 7306.
If complete finned exchanger element
Assembled finned tube bundles are refrigerating machinery parts.
If OD exceeding 114.3mm
Larger statistical diameter bands within same suitability category.
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Import Tips & Compliance
• Declare as 'base tube for finning' with surface finish specs for heat exchanger use
• Ensure dimensional tolerance certificates for OD consistency under 38.1mm limit
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