Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters

This code covers seamless tubes and pipes, generally of alloy steel, specifically designed for high-temperature applications like boilers and heat exchangers. Use this code when importing these specialized pipes and tubes, noting they generally enter the US duty-free, but fall within Chapter 73, which covers articles of iron or steel.

Detailed information for HTS Code 7304.59.20

This tariff code falls within Chapter 73 of the Harmonized Tariff Schedule, which covers articles of iron or steel. Specifically, code 7304.59.20 covers seamless tubes, pipes, and hollow profiles of iron or steel, suitable for use in boilers, heat exchangers, and similar industrial applications. Further breakdown exists based on material (like heat-resisting steel) and outside diameter, ranging from less than 38.1 mm to exceeding 406.4 mm; choose the appropriate subdivision based on these specifications to ensure accurate classification. Statistical suffixes aren’t apparent from the provided information, but rely on official statistical notes for guidance if required.

Chapter	Chapter 73 - Articles of iron or steel
Section	Section XV - Base Metals and Articles of Base Metal

Duty snapshot

Quick reference for the duty outcomes tied to this HTS line.

General Duty

Free

Standard trade partners (NTR)

Special Duty

N/A

Eligible FTA or preference programs

The general duty rate for HTS code 7304.59.20 is Free, meaning no duty is assessed on imports of these seamless iron or steel tubes and pipes when originating from standard trade partners. Special rates are not specified, but eligibility for Free Trade Agreements (FTAs) or preference programs could potentially offer reduced or eliminated duties. This applies equally to all subdivisions (7304.59.20.30 through 7304.59.20.80) which delineate products by material (heat-resisting steel) or outside diameter. All imports are to be reported in kilograms (kg).

Rate of Duty (Column 2): 35%

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Code subdivisions

7304.59.20.30

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: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Of heat-resisting steel

Parent subheading for dairy herd replacements

7304.59.20.40

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: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Other: > Having an outside diameter less than 38.1 mm

7304.59.20.45

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: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Other: > Having an outside diameter of 38.1 mm or more but not exceeding 114.3 mm

7304.59.20.55

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: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Other: > Having an outside diameter exceeding 114.3 mm but less than 190.5 mm

7304.59.20.60

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: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Other: > Having an outside diameter of 190.5 mm or more but not exceeding 285.8 mm

7304.59.20.70

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: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Other: > Having an outside diameter exceeding 285.8 mm but not exceeding 406.4 mm

7304.59.20.80

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: > Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters > Other: > Having an outside diameter exceeding 406.4 mm

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Chapter & section notes

Chapter notes

Harmonized Tariff Schedule of the United States Revision 29 (2025) Annotated for Statistical Reporting Purposes CHAPTER 73 ARTICLES OF IRON OR STEEL XV 73-1 Notes 1. In this chapter the expression "cast iron" applies to products obtained by casting in which iron predominates by weight over each of the other elements and which do not comply with the chemical composition of steel as defined in Note 1(d) to chapter 72. 2. In this chapter the word "wire" means hot- or cold-formed products of any cross-sectional shape, of which no cross-sectional dimension exceeds 16 mm. Additional U.S. Notes 1. For the purposes of heading 7304 or 7306, the rate of duty "Free (C)" appearing in the "Special" subcolumn applies only to tubes and pipes with attached fittings, suitable for conducting gases or liquids. 2. For the purposes of subheading 7307.19.30, the expression "ductile fittings" refers to fittings which contain over 2.5 percent carbon and over 0.02 percent of magnesium or of magnesium and cerium, by weight. Statistical Note 1. For the purposes of statistical reporting numbers 7310.10.0005, 7310.29.0020 and 7310.29.0055, “refillable stainless steel kegs, whether or not pressurized” refers to cylindrical kegs for liquid beverages, each keg with a domed top and bottom and a single neck piece, designed for a coupler (valve) system and an extractor tube (spear) by which the keg can be cleaned, filled and dispense the liquid contents. Harmonized Tariff Schedule of the United States Revision 29 (2025) Annotated for Statistical Reporting Purposes XV 73-2

Section notes

SECTION XV BASE METALS AND ARTICLES OF BASE METAL XV-1 Notes 1. This section does not cover: (a) Prepared paints, inks or other products with a basis of metallic flakes or powder (headings 3207 to 3210, 3212, 3213 or 3215); (b) Ferrocerium or other pyrophoric alloys (heading 3606); (c) Headgear or parts thereof of heading 6506 or 6507; (d) Umbrella frames or other articles of heading 6603; (e) Goods of

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Last updated

November 15, 2025

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