# United States tariff lines under HS 7304.31

> The United States tariff splits HS 7304.31 (other, of circular cross-section, of iron or non-alloy steel: Cold-drawn or cold-rolled (cold-reduced)) into 3 national lines: 7304.31.30.00 (hollow bars), 7304.31.60.10 (suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters) and 7304.31.60.50 (other). Every United States line under 7304.31 is free of general (MFN) duty.

Source: https://border.bot/countries/united-states/hs-codes/730431
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 73](https://border.bot/countries/united-states/hs-codes/73) / [7304.31](https://border.bot/countries/united-states/hs-codes/730431)

## Key facts

- HS subheading: [7304.31](https://border.bot/hs-codes/730431)
- Duty (MFN): Free
- National lines: 3
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 73: Articles of iron or steel

## United States lines under 7304.31

The United States tariff splits HS 7304.31 (other, of circular cross-section, of iron or non-alloy steel: Cold-drawn or cold-rolled (cold-reduced)) into 3 national lines: 7304.31.30.00 (hollow bars), 7304.31.60.10 (suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters) and 7304.31.60.50 (other).

Every United States line under 7304.31 is free of general (MFN) duty.

- [7304.31.30.00](https://border.bot/countries/united-states/hs-codes/7304313000) Other, of circular cross section, of iron or nonalloy steel, Cold-drawn or cold-rolled (cold-reduced), Hollow bars. Duty (MFN): free
- [7304.31.60.10](https://border.bot/countries/united-states/hs-codes/7304316010) Other, of circular cross section, of iron or nonalloy steel, Cold-drawn or cold-rolled (cold-reduced), Other, Suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters. Duty (MFN): free
- [7304.31.60.50](https://border.bot/countries/united-states/hs-codes/7304316050) Other, of circular cross section, of iron or nonalloy steel, Cold-drawn or cold-rolled (cold-reduced), Other, Other. Duty (MFN): free

## In other countries

No other national tariff on border.bot has live lines under 7304.31 yet.

- [The Harmonized System text for 7304.31](https://border.bot/hs-codes/730431)

- Previous subheading: [7304.29](https://border.bot/countries/united-states/hs-codes/730429) Other
- Next subheading: [7304.39](https://border.bot/countries/united-states/hs-codes/730439) Tubes, pipes and hollow profiles, seamless, of iron (other than cast iron) or steel

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 7304.31?

The United States tariff splits HS 7304.31 (other, of circular cross-section, of iron or non-alloy steel: Cold-drawn or cold-rolled (cold-reduced)) into 3 national lines: 7304.31.30.00 (hollow bars), 7304.31.60.10 (suitable for use in boilers, superheaters, heat exchangers, condensers, refining furnaces and feedwater heaters) and 7304.31.60.50 (other).

### What is the duty on HS 7304.31 in the United States?

Every United States line under 7304.31 is free of general (MFN) duty.

## Sources and updates

The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

This page was last updated on 9 October 2026.

Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.

Official source files:

- https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false

Machine-readable: https://border.bot/countries/united-states/hs-codes/730431.json