Steels for heat treatment, alloy steels and steels for automatics. Part 3: Steels for carburising

This technical document establishes specifications for case-hardening steels, covering alloy steels and free-machining steels intended for heat treatment applications. It defines chemical composition limits, mechanical property requirements, and quality criteria to ensure consistency in materials used for components subjected to surface hardening processes. The scope encompasses various grades suitable for automotive gears, bearings, and other mechanical parts requiring a tough core with a hardened outer layer. Detailed tables and guidelines within the text provide manufacturers and suppliers with a unified reference for material selection and quality assurance. By adhering to these guidelines, stakeholders can maintain uniformity across production chains and facilitate international trade of steel products. The document serves as a comprehensive technical resource for metallurgists, engineers, and quality control personnel involved in the fabrication of high-performance steel components. It focuses solely on technical parameters without addressing regulatory enforcement or market adoption trends.