Introduction: The Backbone of Boiler and Pressure Vessel Integrity In the world of high-pressure engineering, safety is not a preference—it is a mathematical certainty derived from rigorous standards. At the heart of this safety architecture lies the ASME Boiler and Pressure Vessel Code (BPVC) . For engineers, inspectors, and manufacturers, the code is the legal and technical bible. Within this eleven-section compendium, Section II – Materials plays a critical role. Specifically, Part A – Ferrous Material Specifications is the definitive source for the properties, chemical compositions, and permissible applications of iron-based alloys.