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OSNA-Cu 58®:
Forming, Thread cutting, Soldering and welding
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- Cold and warm forming
As OSNA-Cu 58® alloys have been especially developed for machining applications, its cold-forming porperties are inevitably slightly reduced. However, the cold-forming properties of OSNA-Cu 58® still compare favourably with other copper alloys.
In soft annealed condition, 40 % forming is still possible.
OSNA-Cu 58® Te and OSNA-Cu 58® S are excellent for hot-forming. All common hot-forming processes are possible within a temperature range of 750 - 875°C.
- Soldering and welding
OSNA-Cu 58® materials are suitable for soft and hard soldering. It has better mechanical properties at high temperatures than standard Cu-ETP/C 101 copper. This is advantageous for soft-soldering. If done properly, cold-formed OSNA-Cu 58® can be soft-soldered with significant loss of hardness. To soft-solder, use lead and tin solder. Silver-solder is recommended for hard soldering. Use special-quality for hard soldering OSNA-Cu 58® Te.
- Thread cutting
The thread should be manufactured by rolling (hobbing) to avoid disrupting the material's grain structure. Furthermore thread rolling improves fatigue strength.
Thread cutting should be carried out at a low cutting speed, with thorough cooling and lubrication with light cutting oil. High pressure cooling is recommended for removing swarf which would otherwise stick to the cutting tool and damage the thread profile. For all copper, including KME OSNA-Cu 58® quality, coarser threading is recommended.
- Note
When using the alloy OSNA-Cu 58® as a raw material for screws, notch sensitivity must be taken into account.
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