Alloy 20 is a nickel-iron-chromium alloy stabilised by the addition of copper (Cu) and niobium (Nb). Its carefully balanced chemical composition confers outstanding corrosion resistance to sulphuric acid and provides effective resistance to stress corrosion cracking in environments containing halide ions. It stands as the benchmark material for addressing corrosion issues in medium-concentration sulphuric acid applications within the chemical and petrochemical industries. Core Characteristics: Exceptional sulphuric acid corrosion resistance: Significantly outperforms conventional stainless steels across a broad range of concentrations and temperatures, representing its core value. Superior stress corrosion cracking resistance: Demonstrates strong resistance to stress corrosion cracking induced by chlorides and other halides. Comprehensive corrosion resistance: Demonstrates excellent resistance to phosphoric acid, nitric acid, and various organic acids and inorganic salt solutions. Outstanding intergranular corrosion resistance: Niobium stabilisation prevents sensitisation post-welding, maintaining robust intergranular corrosion resistance. Cost-effectiveness: In specific media like sulphuric acid, its performance rivals more expensive nickel-based alloys while offering significant cost advantages.