7304.59.20
8-digit subheadingSuitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters
This is a 8-digit subheading — a category, not a filing code. Pick the more specific code beneath it that best matches your goods; only a 10-digit statistical code can be used on a customs entry.
Duty rates
Duty-free under this rate column.
| Rate | Value and what it means |
|---|---|
| General rate (Column 1) | FreeColumn 1 general Applies to most trading partners — the standard "normal trade relations" rate. |
| Special rate (Column 1) | —Trade programs The country letters in parentheses are free trade agreement and preference programs. If your goods qualify under one of them, that rate replaces the general rate. |
| Column 2 rate | 35%Non-NTR Reserved for the small group of countries that do not have normal trade relations with the US (currently Cuba, North Korea, Russia and Belarus). Almost no importer uses this column — if you are shipping from anywhere else, ignore it. |
| Unit of quantity | — How CBP expects the quantity to be reported on the entry summary. |
Where this sits in the schedule
The tariff schedule is read top-down: each line inherits the wording of the categories above it.
Tubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Other, of circular cross section, of other alloy steel: > Other: > Other:
Codes within Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters
7 more specific lines fall under 7304.59.20.
- 7304.59.20.30Of heat-resisting steel10-digit statistical codeTubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Other, of circular cross section, of other alloy steel: > Other: > Other: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters
- 7304.59.20.40Having an outside diameter less than 38.1 mm10-digit statistical codeTubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Other, of circular cross section, of other alloy steel: > Other: > Other: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Other:
- 7304.59.20.45Having an outside diameter of 38.1 mm or more but not exceeding 114.3 mm10-digit statistical codeTubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Other, of circular cross section, of other alloy steel: > Other: > Other: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Other:
- 7304.59.20.55Having an outside diameter exceeding 114.3 mm but less than 190.5 mm10-digit statistical codeTubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Other, of circular cross section, of other alloy steel: > Other: > Other: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Other:
- 7304.59.20.60Having an outside diameter of 190.5 mm or more but not exceeding 285.8 mm10-digit statistical codeTubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Other, of circular cross section, of other alloy steel: > Other: > Other: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Other:
- 7304.59.20.70Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm10-digit statistical codeTubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Other, of circular cross section, of other alloy steel: > Other: > Other: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Other:
- 7304.59.20.80Having an outside diameter exceeding 406.4 mm10-digit statistical codeTubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel: > Other, of circular cross section, of other alloy steel: > Other: > Other: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Other:
Chapter 73: Articles of Iron or Steel
Browse every code in this chapter to compare neighbouring classifications.
View Chapter 73Source: USITC Harmonized Tariff Schedule, 2026 Basic Edition, Revision 16. Rate text is reproduced verbatim from the official export; category paths and duty estimates are derived.
Data loaded August 18, 2026.Check this chapter on hts.usitc.govReport an error with this codeHow this data is built