Invar 36 3

[Themeteng]

Hi fellas

Is post weld stress relief necessary for Invar 36 alloy?

 

[metengr]

No.

http://www.rolledalloys.com/alloys/...M_QtqXGlLwCFatcMgodzi8Aig#physical-properties

 

[arunmrao]

I second metengr .

 

[EdStainless]

Not unless you are going for the absolutely lowest thermal expansion possible.
Most Invar pipe is used in the as welded condition.

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Plymouth Tube

 

[arunmrao]

Themeteng

There is an excellent book by my good friend James Kelly,I would recommend you buy a copy

Heat Resistant Alloys by James Kelly : ISBN 978-0-9801065-2-7.

Happy reading.

 

[MagBen]

Although the presence of stresses causes very slight changes in dimensional stability with respect to time and temperature, a stress relief thermal treatments are at times necessary to promote structure uniformity and dimensional stability.