The Importance of NACE RP0472 PDF in Corrosion Prevention and Control

Heat-Affected Zone (HAZ): Hardness must not exceed 248 Hv10 (Vickers). Since production testing of the HAZ is difficult, it is controlled through base metal chemistry (limiting carbon equivalent), post-weld heat treatment (PWHT), or specific "thermal methods" like cooling time control. Residual Stress Reduction for ASCC:

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NACE RP0472, now updated as NACE SP0472, outlines procedures for controlling weldment hardness in P-No. 1 carbon steels to prevent environmental cracking in petroleum refining environments. The standard mandates a maximum hardness of 200 HBW for weld deposits and provides guidelines for heat-affected zones through base metal chemistry and post-weld heat treatment (PWHT). The official, current standard is available for purchase through Nace RP0472 - 2005 | PDF - Scribd