Best metal for bushings for cast iron hot water radiators with steel pipes?

sixplex

I’m confused and would appreciate advice from someone with experience.

I like stainless steel, but I’ve heard it can damage cast-iron threads during installation or removal. Still one of Toronto’s largest cast-iron radiator shops (Ironworks), sells only stainless-steel bushings.

Brass can lose zinc and become brittle. Is that a concern with a high-quality brass adapter, such as Parker, in an older heating system that’s mostly—but not completely—free of air?

Bronze seems ideal, but the specific bushings I need are impossible to find in the specific length.

Steel rusts and looks bad.

What’s the best choice?

pecmsg

why not Steel?

Brass with lead I like

Stainless Steel damaging cast iron is a new one on me. Stainless is actually cheaper then brass

Grallert

No need to reinvent the wheel. I would concider steel the best choise