Heading 2849: Carbides, whether or not chemically defined:

From Chapter 28: Chapter 28

HTS Codes (10-Digit)

HTS Code Description General Duty
2849100000
Carbides, whether or not chemically defined Of calcium
1.8%
2849201000
Of silicon Crude
Free
2849202000
Of silicon In grains, or ground, pulverized or refined
0.5%
2849901000
Other Of boron
3.7%
2849902000
Other Of chromium
4.2%
2849903000
Other Of tungsten
5.5%
2849905000
Other Other
3.7%