What type of steel sparks the least when cutting with a torch?

Mild steel is recognized for producing the least amount of sparks when cut with a torch compared to other types of steel. This is primarily due to its lower carbon content and the absence of additional alloying elements that can ignite or cause flaring during cutting. When torch cutting, materials with higher carbon or alloy contents, such as carbon steel, stainless steel, and alloy steel, generally generate more sparks due to the combustion of those additional elements, resulting in a more vigorous reaction with the flame. Mild steel's simpler composition makes it relatively easier to cut without significant oxidation or vigorous combustion, which leads to fewer sparks being emitted during the process.