While reading another thread here, I noticed some comments about what types
of cutting wheel to use for cutting metal. One person wrote,

"Although steel is tough on a diamond blade, it isn't instant death.
I have used mine in reinforced concrete. I have also used a diamond
wheel on cast iron pipe. (just because it was tight and a fiber wheel
wore down too fast)"

My question is, for cutting cast iron sewer pipe -- with an angle grinder --
what type of wheel/cutter is recommended?

I always thought that any "metal cutting" wheel/cutter would be fine --
maybe a diamond blade? But, what are the possible choices, and what would
people here suggest or recommend?

Thanks.