A comprehensive guide offers a practical overview of how nickel-containing alloys perform in sulphuric acid environments across different concentrations. It explains the corrosion behaviour of carbon steels, stainless steels, nickel alloys, duplex grades, and other metals, and highlights how factors such as temperature, acid strength, flow conditions, and contaminants influence material selection. The guide also outlines alloy performance in concentrated, intermediate, and dilute sulphuric acid and summarises best practices for choosing corrosion-resistant materials in industrial processes involving sulphuric acid.