HTS heading 7304 · Chapter 73
HTS 7304: Tubes, pipes and hollow profiles, seamless, of iron or…
HTS heading 7304 covers tubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel. It has 31 tariff lines with a duty rate; the general (MFN) rates are Free (31 lines).
Imports may also owe Chapter 99 tariffs (Section 232, 301 or 201) depending on origin and date, plus the Merchandise Processing Fee and, by sea, the Harbor Maintenance Fee.
Rates from the 2026 HTS Revision 22, effective October 30, 2026. Source: U.S. International Trade Commission.
Tariff lines and duty rates
| HTS code | Description | General | Special | Column 2 | Estimate |
|---|---|---|---|---|---|
| Line pipe of a kind used for oil or gas pipelines: | |||||
| 7304.11.00 | Of stainless steel | Free | 35% | ||
| 7304.11.00.20 | Having an outside diameter not exceeding 114.3 mm[kg] | Estimate → | |||
| 7304.11.00.50 | Having an outside diameter exceeding 114.3 mm but not exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.11.00.80 | Having an outside diameter exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.19 | Other: | ||||
| 7304.19.10 | Of iron or nonalloy steel | Free | 25% | ||
| 7304.19.10.20 | Having an outside diameter not exceeding 114.3 mm[kg] | Estimate → | |||
| 7304.19.10.30 | Having an outside diameter exceeding 114.3 mm but less than 215.9 mm[kg] | Estimate → | |||
| Having an outside diameter of 215.9 mm or more but not exceeding 406.4 mm: | |||||
| 7304.19.10.45 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.19.10.60 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| 7304.19.10.80 | Having an outside diameter exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.19.50 | Of other alloy steel | Free | 35% | ||
| 7304.19.50.20 | Having an outside diameter not exceeding 114.3 mm[kg] | Estimate → | |||
| 7304.19.50.50 | Having an outside diameter exceeding 114.3 mm but not exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.19.50.80 | Having an outside diameter exceeding 406.4 mm[kg] | Estimate → | |||
| Casing, tubing and drill pipe, of a kind used in drilling for oil or gas: | |||||
| 7304.22.00 | Drill pipe of stainless steel | Free | 35% | ||
| Having an outside diameter not exceeding 168.3 mm: | |||||
| 7304.22.00.30 | Having a wall thickness not exceeding 9.5 mm[kg] | Estimate → | |||
| 7304.22.00.45 | Having a wall thickness exceeding 9.5 mm[kg] | Estimate → | |||
| 7304.22.00.60 | Having an outside diameter exceeding 168.3 mm[kg] | Estimate → | |||
| 7304.23 | Other drill pipe: | ||||
| 7304.23.30.00 | Of iron or nonalloy steel[kg] | Free | 25% | Estimate → | |
| 7304.23.60 | Of alloy steel | Free | 35% | ||
| Having an outside diameter not exceeding 168.3 mm: | |||||
| 7304.23.60.30 | Having a wall thickness not exceeding 9.5 mm[kg] | Estimate → | |||
| 7304.23.60.45 | Having a wall thickness exceeding 9.5 mm[kg] | Estimate → | |||
| 7304.23.60.60 | Having an outside diameter exceeding 168.3 mm[kg] | Estimate → | |||
| 7304.24 | Other, of stainless steel: | ||||
| Casing: | |||||
| 7304.24.30 | Threaded or coupled | Free | 28% | ||
| Having an outside diameter less than 215.9 mm: | |||||
| 7304.24.30.10 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.24.30.20 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| Having an outside diameter of 215.9 mm or more but not exceeding 285.8 mm: | |||||
| 7304.24.30.30 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.24.30.40 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| 7304.24.30.45 | Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.24.30.80 | Having an outside diameter exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.24.40 | Other | Free | 8.5% | ||
| Having an outside diameter less than 215.9 mm: | |||||
| 7304.24.40.10 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.24.40.20 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| Having an outside diameter of 215.9 mm or more but not exceeding 285.8 mm: | |||||
| 7304.24.40.30 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.24.40.40 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm: | |||||
| 7304.24.40.50 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.24.40.60 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| 7304.24.40.80 | Having an outside diameter exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.24.60 | Tubing | Free | 35% | ||
| Having an outside diameter not exceeding 114.3 mm: | |||||
| 7304.24.60.15 | Having a wall thickness not exceeding 9.5 mm[kg] | Estimate → | |||
| 7304.24.60.30 | Having a wall thickness exceeding 9.5 mm[kg] | Estimate → | |||
| 7304.24.60.45 | Having an outside diameter exceeding 114.3 mm but less than 215.9 mm[kg] | Estimate → | |||
| 7304.24.60.60 | Having an outside diameter of 215.9 mm or more but not exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.24.60.75 | Having an outside diameter exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.29 | Other: | ||||
| Casing: | |||||
| Of iron or nonalloy steel: | |||||
| 7304.29.10 | Threaded or coupled | Free | 20% | ||
| Having an outside diameter less than 215.9 mm: | |||||
| 7304.29.10.10 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.29.10.20 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| Having an outside diameter of 215.9 mm or more but not exceeding 285.8 mm: | |||||
| 7304.29.10.30 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.29.10.40 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm: | |||||
| 7304.29.10.50 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.29.10.60 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| 7304.29.10.80 | Having an outside diameter exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.29.20 | Other | Free | 1% | ||
| Having an outside diameter less than 215.9 mm: | |||||
| 7304.29.20.10 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.29.20.20 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| Having an outside diameter of 215.9 mm or more but not exceeding 285.8 mm: | |||||
| 7304.29.20.30 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.29.20.40 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm: | |||||
| 7304.29.20.50 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.29.20.60 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| 7304.29.20.80 | Having an outside diameter exceeding 406.4 mm[kg] | Estimate → | |||
| Of other alloy steel: | |||||
| 7304.29.31 | Threaded or coupled | Free | 28% | ||
| Having an outside diameter less than 215.9 mm: | |||||
| 7304.29.31.10 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.29.31.20 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| Having an outside diameter of 215.9 mm or more but not exceeding 285.8 mm: | |||||
| 7304.29.31.30 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.29.31.40 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm: | |||||
| 7304.29.31.50 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.29.31.60 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| 7304.29.31.80 | Having an outside diameter exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.29.41 | Other | Free | 8.5% | ||
| Having an outside diameter less than 215.9 mm: | |||||
| 7304.29.41.10 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.29.41.20 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| Having an outside diameter of 215.9 mm or more but not exceeding 285.8 mm: | |||||
| 7304.29.41.30 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.29.41.40 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm: | |||||
| 7304.29.41.50 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.29.41.60 | Having a wall thickness of 12.7 mm or more[kg] | Estimate → | |||
| 7304.29.41.80 | Having an outside diameter exceeding 406.4 mm[kg] | Estimate → | |||
| Tubing: | |||||
| 7304.29.50 | Of iron or nonalloy steel | Free | 25% | ||
| Having an outside diameter not exceeding 114.3 mm: | |||||
| 7304.29.50.15 | Having a wall thickness not exceeding 9.5 mm[kg] | Estimate → | |||
| 7304.29.50.30 | Having a wall thickness exceeding 9.5 mm[kg] | Estimate → | |||
| 7304.29.50.45 | Having an outside diameter exceeding 114.3 mm but less than 215.9 mm[kg] | Estimate → | |||
| 7304.29.50.60 | Having an outside diameter of 215.9 mm or more but not exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.29.50.75 | Having an outside diameter exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.29.61 | Of other alloy steel | Free | 35% | ||
| Having an outside diameter not exceeding 114.3 mm: | |||||
| 7304.29.61.15 | Having a wall thickness not exceeding 9.5 mm[kg] | Estimate → | |||
| 7304.29.61.30 | Having a wall thickness exceeding 9.5 mm[kg] | Estimate → | |||
| 7304.29.61.45 | Having an outside diameter exceeding 114.3 mm but less than 215.9 mm[kg] | Estimate → | |||
| 7304.29.61.60 | Having an outside diameter of 215.9 mm or more but not exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.29.61.75 | Having an outside diameter exceeding 406.4 mm[kg] | Estimate → | |||
| Other, of circular cross section, of iron or nonalloy steel: | |||||
| 7304.31 | Cold-drawn or cold-rolled (cold-reduced): | ||||
| 7304.31.30.00 | Hollow bars[kg] | Free | 22% | Estimate → | |
| 7304.31.60 | Other | Free | 25% | ||
| 7304.31.60.10 | Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters[kg] | Estimate → | |||
| 7304.31.60.50 | Other[kg] | Estimate → | |||
| 7304.39.00 | Other | Free | 25% | ||
| Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters: | |||||
| 7304.39.00.02 | Having an outside diameter less than 38.1 mm[kg] | Estimate → | |||
| 7304.39.00.04 | Having an outside diameter of 38.1 mm or more but less than 190.5 mm[kg] | Estimate → | |||
| 7304.39.00.06 | Having an outside diameter of 190.5 mm or more but not exceeding 285.8 mm[kg] | Estimate → | |||
| 7304.39.00.08 | Having an outside diameter exceeding 285.8 mm[kg] | Estimate → | |||
| Other: | |||||
| 7304.39.00.16 | Galvanized, having an outside diameter not exceeding 114.3 mm[kg] | Estimate → | |||
| Other: | |||||
| 7304.39.00.20 | Having an outside diameter less than 38.1 mm[kg] | Estimate → | |||
| Having an outside diameter of 38.1 mm or more but not exceeding 114.3 mm: | |||||
| 7304.39.00.24 | Having a wall thickness less than 6.4 mm[kg] | Estimate → | |||
| 7304.39.00.28 | Having a wall thickness of 6.4 mm or more but not exceeding 12.7 mm[kg] | Estimate → | |||
| 7304.39.00.32 | Having a wall thickness exceeding 12.7 mm[kg] | Estimate → | |||
| Having an outside diameter exceeding 114.3 mm but less than 190.5 mm: | |||||
| 7304.39.00.36 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.39.00.40 | Having a wall thickness of 12.7 mm or more but less than 19 mm[kg] | Estimate → | |||
| 7304.39.00.44 | Having a wall thickness of 19 mm or more[kg] | Estimate → | |||
| Having an outside diameter of 190.5 mm or more but not exceeding 285.8 mm: | |||||
| 7304.39.00.48 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.39.00.52 | Having a wall thickness of 12.7 mm or more but less than 19 mm[kg] | Estimate → | |||
| 7304.39.00.56 | Having a wall thickness of 19 mm or more[kg] | Estimate → | |||
| Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm: | |||||
| 7304.39.00.62 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.39.00.68 | Having a wall thickness of 12.7 mm or more but less than 19 mm[kg] | Estimate → | |||
| 7304.39.00.72 | Having a wall thickness of 19 mm or more[kg] | Estimate → | |||
| Having an outside diameter exceeding 406.4 mm: | |||||
| 7304.39.00.76 | Having a wall thickness less than 19 mm[kg] | Estimate → | |||
| 7304.39.00.80 | Having a wall thickness of 19 mm or more[kg] | Estimate → | |||
| Other, of circular cross section, of stainless steel: | |||||
| 7304.41 | Cold-drawn or cold-rolled (cold-reduced): | ||||
| 7304.41.30 | Of an external diameter of less than 19 mm | Free | 36% | ||
| 7304.41.30.05 | Of high-nickel alloy steel[kg] | Estimate → | |||
| Other: | |||||
| 7304.41.30.15 | Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters[kg] | Estimate → | |||
| 7304.41.30.45 | Other[kg] | Estimate → | |||
| 7304.41.60 | Other | Free | 36% | ||
| 7304.41.60.05 | Of high-nickel alloy steel[kg] | Estimate → | |||
| Other: | |||||
| 7304.41.60.15 | Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters[kg] | Estimate → | |||
| 7304.41.60.45 | Other[kg] | Estimate → | |||
| 7304.49.00 | Other | Free | 36% | ||
| 7304.49.00.05 | Of high-nickel alloy steel[kg] | Estimate → | |||
| Other: | |||||
| 7304.49.00.15 | Hollow bars[kg] | Estimate → | |||
| Other: | |||||
| 7304.49.00.45 | Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters[kg] | Estimate → | |||
| 7304.49.00.60 | Other[kg] | Estimate → | |||
| Other, of circular cross section, of other alloy steel: | |||||
| 7304.51 | Cold-drawn or cold-rolled (cold-reduced): | ||||
| 7304.51.10.00 | Suitable for use in the manufacture of ball or roller bearings[kg] | Free | 34% | Estimate → | |
| 7304.51.50 | Other | Free | 35% | ||
| 7304.51.50.05 | Of high-nickel alloy steel[kg] | Estimate → | |||
| Other: | |||||
| Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters: | |||||
| 7304.51.50.15 | Of heat-resisting steel[kg] | Estimate → | |||
| 7304.51.50.45 | Other[kg] | Estimate → | |||
| 7304.51.50.60 | Other[kg] | Estimate → | |||
| 7304.59 | Other: | ||||
| 7304.59.10.00 | Suitable for use in the manufacture of ball or roller bearings[kg] | Free | 34% | Estimate → | |
| Other: | |||||
| 7304.59.20 | Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters | Free | 35% | ||
| 7304.59.20.30 | Of heat-resisting steel[kg] | Estimate → | |||
| Other: | |||||
| 7304.59.20.40 | Having an outside diameter less than 38.1 mm[kg] | Estimate → | |||
| 7304.59.20.45 | Having an outside diameter of 38.1 mm or more but not exceeding 114.3 mm[kg] | Estimate → | |||
| 7304.59.20.55 | Having an outside diameter exceeding 114.3 mm but less than 190.5 mm[kg] | Estimate → | |||
| 7304.59.20.60 | Having an outside diameter of 190.5 mm or more but not exceeding 285.8 mm[kg] | Estimate → | |||
| 7304.59.20.70 | Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.59.20.80 | Having an outside diameter exceeding 406.4 mm[kg] | Estimate → | |||
| Other: | |||||
| 7304.59.60.00 | Of heat-resisting steel[kg] | Free | 36% | Estimate → | |
| 7304.59.80 | Other | Free | 35% | ||
| 7304.59.80.10 | Having an outside diameter less than 38.1 mm[kg] | Estimate → | |||
| Having an outside diameter of 38.1 mm or more but not exceeding 114.3 mm: | |||||
| 7304.59.80.15 | Having a wall thickness less than 6.4 mm[kg] | Estimate → | |||
| 7304.59.80.20 | Having a wall thickness of 6.4 mm or more but not exceeding 12.7 mm[kg] | Estimate → | |||
| 7304.59.80.25 | Having a wall thickness exceeding 12.7 mm[kg] | Estimate → | |||
| Having an outside diameter exceeding 114.3 mm but less than 190.5 mm: | |||||
| 7304.59.80.30 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.59.80.35 | Having a wall thickness of 12.7 mm or more but less than 19 mm[kg] | Estimate → | |||
| 7304.59.80.40 | Having a wall thickness of 19 mm or more[kg] | Estimate → | |||
| Having an outside diameter of 190.5 mm or more but not exceeding 285.8 mm: | |||||
| 7304.59.80.45 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.59.80.50 | Having a wall thickness of 12.7 mm or more but less than 19 mm[kg] | Estimate → | |||
| 7304.59.80.55 | Having a wall thickness of 19 mm or more[kg] | Estimate → | |||
| Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm: | |||||
| 7304.59.80.60 | Having a wall thickness less than 12.7 mm[kg] | Estimate → | |||
| 7304.59.80.65 | Having a wall thickness of 12.7 mm or more but less than 19 mm[kg] | Estimate → | |||
| 7304.59.80.70 | Having a wall thickness of 19 mm or more[kg] | Estimate → | |||
| 7304.59.80.80 | Having an outside diameter exceeding 406.4 mm[kg] | Estimate → | |||
| 7304.90 | Other: | ||||
| Having a wall thickness of 4 mm or more: | |||||
| 7304.90.10.00 | Of iron or nonalloy steel[kg] | Free | 1% | Estimate → | |
| 7304.90.30.00 | Of alloy steel[kg] | Free | 8.5% | Estimate → | |
| Having a wall thickness of less than 4 mm: | |||||
| 7304.90.50.00 | Of iron or nonalloy steel[kg] | Free | 25% | Estimate → | |
| 7304.90.70.00 | Of alloy steel[kg] | Free | 35% | Estimate → |
161 lines shown. Statistical suffixes (the last two digits) inherit the rate of the 8-digit subheading above them.
Example: base duty and fees on $10000
For HTS 7304.11.00 at the general rate of Free, shipped by ocean, before any Chapter 99 tariffs:
| Base duty (Free) | $0.00 |
| Merchandise Processing Fee (0.3464%, min $34.58) | $34.64 |
| Harbor Maintenance Fee (0.125%) | $12.50 |
| Duty and fees | $47.14 |
Origin-specific tariffs can multiply this. Run this example from China or from Mexico to see every line.
Duty by country of origin
Frequently asked questions
What is the duty rate for HTS 7304?
Heading 7304 has 31 rate lines. The general (MFN) duty rates are Free (31 lines). Products of free trade agreement partners may enter at the special rate, and Column 2 rates apply to countries without normal trade relations. Chapter 99 tariffs can be added on top: calculate the full amount.
Do Section 301, 232 or 201 tariffs apply to HTS 7304?
It depends on the 8- or 10-digit subheading, the country of origin, the entry date and, for Section 232, the metal content. These additional duties are listed in Chapter 99 of the HTS. The free duty calculator checks each program for a given code, origin and date and shows which apply and why.
What fees are added to an import under HTS 7304?
Formal entries pay the Merchandise Processing Fee of 0.3464% of value (minimum $34.58, maximum $670.86 in FY2027). Ocean shipments also pay the Harbor Maintenance Fee of 0.125% of value. See the import duty calculator for how they combine.