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What makes you think that you can’t braze cro-mo or mild steel to stainless or stainless to stainless with brass?
I don't even know really!
Maybe it's because the fluxes you'd use with silver mention joining dissimilar metals and maybe brass fluxes don't or the ones I've used haven't so I've just assumed that dissimilar metals needed silver.
I do stainless (and other non ferrous metal) headtube badges and details and have always used silver but I guess that's also because it's capillary brazing to a certain degree.
M_V
@LWaB
Brazing is just a hot metal glue. With the correct preparation (allowing wetting), you can braze lots of materials together. There were (rare) brazed aluminium and brazed titanium frames last century. What makes you think that you can’t braze cro-mo or mild steel to stainless or stainless to stainless with brass?
Many folk silver braze stainless tubing because the stainless tubing was high strength and very thin wall, hence tended to distort a lot under the higher heat of brass.