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Blued steel

Dial segment of a [[Rainer Brand Panama Dualtime]] with blued hands (click to enlarge!)
Dial segment of a Rainer Brand Panama Dualtime with blued hands

For blueing the steel parts are slowly and carefully heated (“started”) to about 300°C. The metal then coats with an ultra-thin, cornflower blue shimmering layer of magnetite (Fe304).

The blueing is used in the field of watch manufacturing for the refinement (finishing) of movement parts, especially of screws and watch hands.

blued_steel.txt · Last modified: 03.07.2022 15:32 by

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