| Webster's Online Dictionary |
| Expressions | Domain | Definition | |
| Blue annealing | Metallurgy | An operation performed in a medium and at a suitable temperature to cover the clean ferrous surface with a uniform blue oxide film. Source: European Union. (references) | |
| Blue annealing | Mining | Heating hot-rolled ferrous sheet in an open furnace to a temperature within the transformation range, and then cooling it in air in order to soften the metal. The formation of a bluish oxide on the surface is incidental. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
