Designed for learners working with engineering steels and heat-treatment processes, this course provides a comprehensive exploration of surface hardening treatments used to improve the durability, hardness, and performance of steel components. Learners examine nitriding, induction hardening, and flame hardening processes, including the influence of alloy composition, tensile strength, treatment temperature, and heat-treatment parameters on material performance. Through applied engineering examples, hardness-depth analysis, metallurgical interpretation, and quality assurance activities, participants explore nitride-forming elements, microstructural transformations, and the behaviour of hardened steels under different processing conditions. The course also develops the ability to interpret certificates of testing, hardness data, and mechanical property documentation used in industrial manufacturing and inspection environments. By the end of the course, learners will be able to evaluate surface hardening treatments, analyse metallurgical outcomes, and interpret engineering testing information to support material selection and process-related decisions in manufacturing contexts.