Nace Rp0472 Pdf Jun 2026

: Welding Procedure Specifications (WPS) must be qualified using hardness surveys. This ensures that the combination of base metal, filler metal, and heat input consistently produces welds below the threshold. Post-Weld Heat Treatment (PWHT)

: PWHT is the most common method used to reduce residual stresses and temper the hardness of the HAZ. SP0472 provides guidance on when PWHT is mandatory based on the service environment (e.g., sour service). Base Metal & Filler Selection nace rp0472 pdf

The guide focuses on three primary areas to ensure weld integrity: : Welding Procedure Specifications (WPS) must be qualified

specifically for refinery service. It focuses on preventing Stress Corrosion Cracking (SCC) and Hydrogen-Induced Cracking (HIC) by managing hardness levels in the Heat-Affected Zone (HAZ) and weld metal. Key Technical Pillars of NACE SP0472 Hardness Control SP0472 provides guidance on when PWHT is mandatory

The standard focuses specifically on (Group 1 or 2) used in refining equipment such as pressure vessels, heat exchangers, piping, and pump cases.