Mark, if you are already doing casting, then actually casting
iron by the same method may be possible. Otherwise model
engineering suppliers sell sticks of centrifugally cast iron,
which you could machine, if you have a lathe. Avoid thin
sections though, as I’m sure you know cast iron is brittle.
Steel … well, it’s cheap and plentiful. Easy to silver solder
too. I’m not sure about silver solder on cast iron. I think ou
have to burn the graphite out of the surface first. I know it
can be successfully done in a small furnace.
Stainless might be suitable. There’s stainless, and then
there’s other stainless. There are special fluxes for stainless.
I’ve got away with plain borax a couple of times on non
Real wrought iron might be good, if you can find a really
fibrous piece and let a little rust away. Have to ask around on
theforge list or the bladesmiths.
Then finally, there’s damascus, real or sort of. I understand
interesting patterns can be made by forging a length of wire
rope. So many things to try … good luck.
BTW, is there some special significance to the combination of
iron and diamond? Suppose there must be, or why else would the
customer ask for it. Sounds kind of primeval, sort of fire and
Kevin Eva, Northern England, UK