This standard provides requirements for mitigating environmental cracking in carbon steel weldments within refinery environments.
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Unlike HSC, controlling hardness alone isn't enough for ASCC. This requires managing residual tensile stresses, often through Post-Weld Heat Treatment (PWHT) . Evolution of the Standard NACE SP0472 (formerly RP0472) is the definitive guide
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The industry standard formerly known as has been officially updated and designated as NACE SP0472 (Standard Practice). The most current and active revision is NACE SP0472-2020 ( Methods and Controls to Prevent In-Service Environmental Cracking of Carbon Steel Weldments in Corrosive Petroleum Refining Environments ).
NACE SP0472 (formerly RP0472) is the definitive guide for the petroleum refining industry to avoid in-service cracking in carbon steel weldments. Its main purpose is to provide methods to prevent environmental cracking in the weld metal, the base metal heat-affected zone (HAZ), and the adjacent base metal subject to residual stresses from the welding process. The standard focuses on two primary failure mechanisms:
Initially established in 1972 by NACE Task Group T-8-7, the document was compiled to provide a consolidated standard following the retirement of the equivalent American Petroleum Institute standard, API RP 942. Over subsequent decades, the standard has been continuously revised—most notably in 2005, 2010, 2015, and its current —to keep pace with advanced metallurgy and evolving refining chemistries. Core Technical Scope: What the Standard Covers