The material that can be cut easily using an oxyacetylene torch cutting attachment is:

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Oxyacetylene flame cutting works by heating the metal to a temperature where it will oxidize rapidly in the presence of a strong oxygen stream, and then letting that oxide melt and be blown away as slag. This works best on materials that readily oxidize and support a continuous, self-sustaining reaction.

Carbon steel fits this perfectly treated condition: it readily oxidizes in oxygen, producing iron oxide that can be removed as the cut progresses, allowing a clean, efficient cut with a simple torch setup.

Aluminum, stainless steel, and copper don’t cut easily with this method. Aluminum conducts heat very well and forms a tough oxide layer that blocks the ongoing oxidation needed for flame cutting. Stainless steel has chromium in it, which forms a protective oxide and resists the active oxidation the torch relies on. Copper also conducts heat quickly and forms oxides that don’t slug away in the same way, making stable flame cutting impractical.