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It complements its more famous cousin, (materials for sour service). While MR0175 tells you which materials to choose, RP0472 tells you how to weld, fabricate, and inspect those materials to prevent four specific types of cracking:
: It is widely utilized by refiners, equipment manufacturers, and engineering contractors to ensure the integrity of equipment exposed to wet H₂S (sour service) and other corrosive agents like hydrofluoric acid. Key Hardness Requirements
: By following this recommended practice, pipeline operators can enhance the safety of their systems, reducing the risk of leaks, ruptures, and other hazardous incidents.
The most famous technical "law" within RP0472 is the control of weldment hardness. High hardness is a direct proxy for high strength and low ductility, making the steel susceptible to hydrogen embrittlement.
One of the most distinguishing features of NACE RP0472 is its strict hardness limit. Overview of NACE International Standard RP0472 - OnePetro