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Searching non-magnetic low thermal expansion material!

Searching non-magnetic low thermal expansion material!

Searching non-magnetic low thermal expansion material!

(OP)
Hello,

I am looking for a non-ferromagnetic, maybe a steel type and brazeable material which has an expansion coefficient in an order of magnitude of 8-15ppm/K from 20°C to 800°C , as mean value, would be ideal. Has anybody any ideas?

Thanks!

RE: Searching non-magnetic low thermal expansion material!

310 stainless steel is the only alloy I know which approaches your requirement. It rises from 15.5 to 18 ppm/K from R.t. to 800C.

RE: Searching non-magnetic low thermal expansion material!

If you are looking for a very low coefficient of thermal expansion, try Invar (trademark).  It was designed for this very purpose.  It has a coefficient of 1.7-2.0 from 20-90C.

RE: Searching non-magnetic low thermal expansion material!

(OP)
Thank you for your help. The material I chose finally was Inconel 600. It was the nearest fit with a mean expansion coefficient of about 15 between 20 and 800°C. It was the best fit I could get for my requirements.

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