The (now designated as NACE SP0472 ) is a critical industry standard that provides methods and controls to prevent environmental cracking in carbon steel weldments within corrosive petroleum refining environments. Originally established in 1972, it has evolved from focusing solely on weld deposit hardness to addressing the entire weldment, including the heat-affected zone (HAZ) and adjacent base metal. Scope and Purpose
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 nace rp0472 pdf
| Source | What You’ll Get | Cost (approx.) | Notes | |--------|----------------|----------------|-------| | | Full PDF of the current edition (2020 or later) | $45 – $120 (member discount available) | Members of NACE receive a reduced price; the document can be downloaded instantly after purchase. | | Techstreet, IHS Markit, SAI Global | Digital PDF (often with a “download‑once” license) | $50 – $130 | These distributors sometimes bundle RP‑0472 with related NACE standards. | | University / corporate library | Free electronic access (if the institution subscribes) | $0 | Check the library’s electronic standards collection; many engineering schools have NACE standards in their databases. | | Company internal standards repository | May already hold a copy (if the organization has a licensing agreement) | $0 | Ensure the copy is up‑to‑date; older editions may lack the latest revisions. | NACE RP0472 The (now designated as NACE SP0472