Steel and stainless steel are easily soldered to each other, or to silver with jewellery equipment if you add a pinch of Tenacity No5 to your usual flux to counter oxidation.
I even refixed a loose rung of an oven shelf, about 3 years ago, using extra easy sdolder and the modified flux and it is still going strong.
Another adventure was to patch the leaky corner of an enamel grill pan by exposing the metal and adding an offcut of silver.
For both of these due to their size I used extra easy silver solder.
In jewelley I have used soldered-on surgical grade ss to replace very long ear hooks which became bent in the silver version.
My picture shows a hinged pendant, where the horizontal solderd ss wire is hidden by silver tubes, but was soldered at the ends.
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