For 130 bcd road cranks , surly[qbp] has stainless steel single speed chainrings.
best if the centered middle of a triple crank , lining up with the central cassette cog.

I have one .. single speed SS CR, I got for my IG hub bike..

cyclocross, some setups, uses a single ring setup, so makes a market for
chainguard discs for 44t , and 42 t setups. on road cranks,

i got one for the 38t for my setup..