EN24 Alloy Steel Rod: High-Strength Engineering Steel for Critical Applications EN24 alloy steel rod is a high-strength, high-performance engineering steel known for its toughness, wear resistance, and excellent fatigue strength. Also known by its equivalent grade 817M40, EN24 is a nickel-chromium-molybdenum alloy steel commonly used in high-stress mechanical and automotive components. It is supplied in various conditions such as annealed, hardened and tempered, or as per specific customer requirements. EN24 is widely preferred when a combination of high tensile strength (850–1000 MPa) and good ductility is required.