Heat-treatable steels, alloy steels and free-cutting steels - Part 3: Case-hardening steels (ISO 683-3:2022)

This technical specification establishes requirements for surface hardening steels, forming the third part of a comprehensive series dedicated to heat-treated steels, alloy steels, and automatic steels. It defines material characteristics and performance criteria specifically for alloys undergoing surface hardening processes, which are widely utilized in demanding engineering applications. The document outlines classification systems, chemical composition limits, and mechanical property thresholds necessary to ensure consistency and reliability across the industry. It covers various grades of steel designed to exhibit high surface hardness while maintaining a tough and ductile core, making them suitable for components subjected to significant wear and stress. Detailed testing methods and sampling procedures are included to verify compliance with the specified conditions. This document serves as a reference for manufacturers, designers, and quality control professionals involved in the production and selection of surface hardened steel products. It aligns with international guidelines to facilitate global trade and ensure interoperability among different supply chains and manufacturing processes. The scope encompasses the technical delivery conditions for the specified steel types, providing a unified framework for quality assurance in this specialized sector of metallurgy.