Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]
5. [processes and techniques by material]
6. [metalworking and metalworking processes and techniques]
7. [metalworking processes and techniques]
8. [metal forming processes and techniques]

Anotations

Scope note:

Refers to the process of combining a substance with carbon. In metallurgy. the diffusion of carbon into wrought iron at high temperature to produce steel; or into low carbon steel to increase surface hardness.