The ASME B31.12 standard includes a designated list of materials in Annex 6.1 deemed suitable for hydrogen piping applications. When considering materials not specified on this list, it is incumbent upon the user to conduct comprehensive testing to ascert

When selecting materials for hydrogen piping applications, carbon steel, low alloy carbon steel, and austenitic stainless steel are commonly utilized due to their balance of strength, ductility, and cost-effectiveness. Carbon steel offers good tensile strength and weldability, making it a popular choice for many industrial applications. Low alloy carbon steel enhances the properties of carbon steel by incorporating elements such as chromium, molybdenum, and nickel, which improve its resistance to harsh environments and enhance mechanical performance at elevated temperatures. On the other hand, austenitic stainless steel, known for its excellent corrosion resistance and toughness, is often preferred in environments where exposure to moisture or aggressive chemicals is a concern. Each of these material categories has specific attributes and suitability considerations that must be evaluated when designing hydrogen piping systems in accordance with ASME B31.12 standards.