The standard dictates that every welding procedure specification (WPS) for sour service must be qualified using hardness traverses. You cannot just "guess" the hardness; you must measure it via microhardness testing (HV10).
The Association for Materials Protection and Performance (formed by the merger of NACE and SSPC) hosts the official current version of SP0472.
, cyanides, or carbonates, atomic hydrogen can penetrate the steel. This leads to: nace rp0472 pdf
The standard mandates strict control over welding electrodes and filler wires to ensure they do not introduce trace elements that increase hardenability. C. Production Hardness Testing
It applies strictly to P-No. 1 carbon steels with a minimum specified tensile strength of less than or equal to 485 MPa (70,000 psi) . Primary Damage Mechanisms Covered , cyanides, or carbonates, atomic hydrogen can penetrate
Because NACE SP0472/RP0472 is a copyrighted industry standard, it must be purchased through authorized channels. You can find the latest version on: The AMPP Store (formerly NACE) ANSI Webstore Summary of Key Takeaways
) to diffuse directly into the crystalline lattice of the steel. Production Hardness Testing It applies strictly to P-No
: Ensuring that field welds in process piping maintain the same integrity as shop-fabricated components. Implementation Checklist
Do you have a specific question about interpreting Table 2 of RP0472? Leave a comment below or consult a certified NACE/AMPP Corrosion Specialist.