Steels for thermal treatment, alloy steels and free-machining steels. Part 3: Carburizing steels

This document establishes the technical specifications for steel materials utilized in heat treatment processes, with a specific focus on carburizing steels. It serves as a specialized segment within a broader series addressing alloy and automation-grade steels, providing detailed requirements for the chemical composition and mechanical properties essential for components undergoing surface hardening. The text outlines the necessary criteria to ensure consistency and reliability in the manufacturing of gears, shafts, and other mechanical parts exposed to high stress and wear. By defining the permissible elemental ranges and testing methodologies, it facilitates international trade and ensures that produced materials meet rigorous engineering standards for durability. The guidelines address the unique metallurgical behaviors required for successful carburization, offering a reference framework for quality control in steel production and downstream applications.