This course provides a comprehensive exploration of ultra-high strength steels, focusing on their properties, processing methods, and advanced applications in high-performance engineering environments. Learners will examine how mechanical properties such as strength, toughness, and ductility are influenced by heat treatment processes, particularly quenching and tempering. The course also investigates advanced steel refining techniques, including Electro Slag Remelting (ESR) and Vacuum Arc Remelting (VAR), and their role in improving material purity and performance. In addition, the course introduces maraging steels as a specialized class of ultra-high strength materials, highlighting their unique strengthening mechanisms based on martensite formation and age hardening. Through practical scenarios and assessments, learners will evaluate material selection criteria and processing routes for critical applications where high strength-to-weight ratio, reliability, and structural integrity are essential, such as aerospace and high-performance mechanical systems.