"Patrick" wrote in message
e...
Steel won't be difficult to solder but it might lose its spring
properties. Any advise/ comments?

Springs are tempered at almost that temperature, so you're okay.
In fact it should be good to 600°F or so... not something you're likely
to reach in normal soldering.
Above that temp, it reduces the yield strength of the metal - reducing
the useful stretching range before it permanently bends.

Tim

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