Heat-resistant Iron-Chromium-Aluminium Alloy with Low Chromium Vaporization Rate and Elevated Thermal Stability

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The patent presents a specialized iron-chromium-aluminum alloy designed to withstand high temperatures with enhanced thermal stability and low chromium vaporization. This alloy features carefully balanced component percentages (Cr, Al, W, Nb, Si, Mn, and trace elements) to improve its strength at elevated temperatures, resist oxidation and corrosion, and retain good workability. Its composition promotes the formation of protective aluminum oxide layers that reduce chromium loss and enhances the alloy’s durability under demanding environments.

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• Interconnect plates and components in solid oxide fuel cells (SOFCs), especially where electrical insulation is required.
• Heat exchanger parts subject to prolonged high-temperature operation.
• Trays, wires, strips, or mesh for use in metallic automotive exhaust catalysts.
• High-temperature heating elements for industrial furnaces or household appliances.
• General structural parts exposed to hot gases or aggressive atmospheres in power plants or chemical processing.

BenefitsContent extracted from patent full text and abstract with AI.

• Significantly improved heat and creep resistance at temperatures up to 1100°C, ensuring longer component service life.
• Low chromium vaporization, which minimizes catalytic poisoning and maintains performance, especially in fuel cell applications.
• Excellent oxidation and corrosion resistance due to stable α-aluminum oxide surface formation, even in harsh environments.
• Good mechanical workability and ductility at both room and high temperatures, making processing into forms like sheets and wires feasible.
• Customizable alloy system with optional element substitutions for further property optimization depending on the application.

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Patent Abstract

An iron-chromium-aluminium alloy with improved heat resistance, low chromium vaporization rate and good processability, comprising (in % by mass), 2.0 to 4.5% Al, 12 to 25% Cr, 1.0 to 4% W, 0.25 to 2.0% Nb, 0.05 to 1.2% Si, 0.001 to 0.70 % Mn, 0.001 to 0.030% C, 0.0001 to 0.05% Mg, 0.0001 to 0.03% Ca, 0.001 to 0.030% P, max. 0.03% N, max. 0.01% S, remainder iron and the usual melting-related impurities.