carburize

/ˈkɑːrbjəraɪz/
verb
  1. To add carbon to the surface of a metal (especially iron or steel) to make it harder. (Alternative spelling of carburise.)
    • You can carburize a tool by heating it in a carbon-rich environment.
    • Engineers often carburize steel components for cars and trucks.
    • The company specializes in treating metals to carburize them for industrial use.
Synonyms
What does "carburize" mean? | whatsthatwordmean | whatsthatwordmean