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Sulfuric acid is not necessarily more corrosive to steel than hydrochloric acid. The corrosion rate is dependent on many factors including concentration of the acid, temperature, type of steel, contaminants, and velocity of the fluid.

For example, sulfuric acid at concentrations of 96% or better, at ambient temperatures may be safely contained for long periods of time in mild steel or low alloy cast iron containers provided fluid velocity is low. If the concentration drops below 94-95% corrosion will accelerate dramatically.

Stainless steels would provide better resistance to both acids, but might develop localized corrosion issues (pitting, crevice corrosion) in hydrochloric acid due to the presence of chloride ions. Depending on the particular alloy and the concentration of the acid stainless steels might or might not be attacked (general or uniform corrosion) by either acid.

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Q: Why is sulfuric acid more corrosive to steel than hydrochloric acid?
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