carburise
/ˈkɑːrbjəraɪz/
verb
- To add carbon to the surface of a metal (especially iron or steel) to make it harder.
- You can carburise a knife blade to improve its edge retention.
- Blacksmiths used to carburise iron by heating it with charcoal.
- The factory uses a special furnace to carburise steel gears for heavy machinery.
Synonyms