Nace Sp0170 Pdf May 2026

If you fall into one of the following categories, keeping a copy of NACE SP0170 handy is essential:

The latest edition of NACE SP0170 (typically reaffirmed with minor updates) includes: nace sp0170 pdf

NACE SP0170 (formerly designated RP0170 before the society renamed its “Recommended Practices” to “Standards Practices”) is titled: “Protection of Austenitic Stainless Steels and Other Austenitic Alloys from Polythionic Acid Stress Corrosion Cracking (SCC) During Shutdowns and Start-ups.” If you fall into one of the following

However, its most widely cited application goes beyond polythionic acid. The standard has become the go-to industry reference for: In simple terms: When you have a carbon

In simple terms: When you have a carbon steel pipe or vessel handling hot, sulfur-containing hydrocarbons (typical in crude units or hydrotreaters), the weld area is chemically different from the base metal. It corrodes much faster. NACE SP0170 tells you how to stop that—usually by applying a corrosion-resistant alloy (CRA) weld overlay.

The search for a “NACE SP0170 PDF” is driven by three common needs:

Crucial warning: Many free PDFs circulating online are outdated drafts, unofficial summaries, or old RP0170 versions from the 1990s. Using the wrong revision can lead to under-protected welds, premature failure, or a plant fire.