The standard aims to prevent several devastating failure modes, including: Stress Corrosion Cracking (SCC) Sulfide Stress Cracking (SSC) 2. The Hardness Mandate: 200 HBW
The three conditions necessary for wet H₂S cracking to occur are: nace rp0472 pdf
Maximum allowable hardness values for welds and heat-affected zones (HAZ). Procedures for production hardness testing. Welding material selection and qualification. Post-weld heat treatment (PWHT) practices. Why Hardness Control Matters in Refinery Environments The standard aims to prevent several devastating failure
All pressure-containing weldments or internal attachment weldments to the pressure boundary are included. Both new fabrication and repair welds are within the scope of the standard. Welding material selection and qualification
The 2005 edition of NACE RP0472 is now superseded, as indicated by several sources. The superseded date is listed as November 7, 2008, with the standard being redesignated as NACE SP 04 72. Users are cautioned to obtain the latest edition of the standard, as information in an outdated version may not be accurate.
Restricting the chemistry of the base and filler metals to ensure low hardenability.
NACE RP0472 standard, now maintained as NACE SP0472 , provides essential guidelines for controlling cracking in carbon steel weldments