# United States tariff lines under HS 2849.90

> The United States tariff splits HS 2849.90 (carbides, whether or not chemically defined) into 4 national lines: 2849.90.10.00 (of boron), 2849.90.20.00 (of chromium), 2849.90.30.00 (of tungsten) and 2849.90.50.00 (other). The general (MFN) duty differs by line: 3.7% on 2849.90.10.00, 4.2% on 2849.90.20.00, 5.5% on 2849.90.30.00 and 3.7% on 2849.90.50.00.

Source: https://border.bot/countries/united-states/hs-codes/284990
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 28](https://border.bot/countries/united-states/hs-codes/28) / [2849.90](https://border.bot/countries/united-states/hs-codes/284990)

## Key facts

- HS subheading: [2849.90](https://border.bot/hs-codes/284990)
- National lines: 4
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 28: Inorganic chemicals; organic or inorganic compounds of precious metals, of rare-earth metals, of radioactive elements or of isotopes

## United States lines under 2849.90

The United States tariff splits HS 2849.90 (carbides, whether or not chemically defined) into 4 national lines: 2849.90.10.00 (of boron), 2849.90.20.00 (of chromium), 2849.90.30.00 (of tungsten) and 2849.90.50.00 (other).

The general (MFN) duty differs by line: 3.7% on 2849.90.10.00, 4.2% on 2849.90.20.00, 5.5% on 2849.90.30.00 and 3.7% on 2849.90.50.00.

- [2849.90.10.00](https://border.bot/countries/united-states/hs-codes/2849901000) Other, Of boron. Duty (MFN): 3.7%
- [2849.90.20.00](https://border.bot/countries/united-states/hs-codes/2849902000) Other, Of chromium. Duty (MFN): 4.2%
- [2849.90.30.00](https://border.bot/countries/united-states/hs-codes/2849903000) Other, Of tungsten. Duty (MFN): 5.5%
- [2849.90.50.00](https://border.bot/countries/united-states/hs-codes/2849905000) Other, Other. Duty (MFN): 3.7%

## In other countries

No other national tariff on border.bot has live lines under 2849.90 yet.

- [The Harmonized System text for 2849.90](https://border.bot/hs-codes/284990)

- Previous subheading: [2849.20](https://border.bot/countries/united-states/hs-codes/284920) Of silicon
- Next subheading: [2850.00](https://border.bot/countries/united-states/hs-codes/285000) Hydrides, nitrides, azides, silicides and borides, whether or not chemically defined, other than compounds which are also carbides of heading 2849

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 2849.90?

The United States tariff splits HS 2849.90 (carbides, whether or not chemically defined) into 4 national lines: 2849.90.10.00 (of boron), 2849.90.20.00 (of chromium), 2849.90.30.00 (of tungsten) and 2849.90.50.00 (other).

### What is the duty on HS 2849.90 in the United States?

The general (MFN) duty differs by line: 3.7% on 2849.90.10.00, 4.2% on 2849.90.20.00, 5.5% on 2849.90.30.00 and 3.7% on 2849.90.50.00.

## 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/284990.json