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Introduction

NACE SP0170

The standard, titled "Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking During a Shutdown of Refinery Equipment," is a critical standard practice used by the petroleum refining industry. While users often search for a "2021" edition, it is important to note that as of May 2026, the NACE SP0170-2018 edition remains the most current and active version of the standard. In 2021, NACE International merged with the Society for Protective Coatings (SSPC) to form AMPP (Association for Materials Protection and Performance), which now maintains the standard under Task Group 173. Overview of NACE SP0170

Recommendation:

For projects outside North America, use ISO 15156. For any project in the U.S. (especially OCS and onshore sour gas), use NACE SP0170 PDF 2021 as the governing document. nace sp0170 pdf 2021

Material Selection:

Using "stabilized" grades of steel (like Type 321 or 347) or specialized heat treatments during fabrication to make the metal inherently more resistant. Is there a 2021 PDF? Introduction NACE SP0170 The standard, titled "Protection of