Subject: Stainless steel
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Dear Technetters.

We have been trying to solder a connector of plated stainless steel to a
ceramic substrate. We have not been sucessful so far.
Cracks occur in the solder joint after soldering.
We think the coefficient of thermal expansion in the stainless steel is
to high.
The material in the connector is CRES 303. (Acc to ASTM 484 and 582)
What material is the connector made of? The supplier is an american
company.

The CRES 303 says nothing to me.
Is the material an ordinary 18-8 stainless steel (18%NI and 8%Cr)?
In that case the coefficient of thermal expansion is approx 18 ppm and
that could explain the cracks.

Regards
Christer Marklund
 

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