ASTM A928M-08A Standard Specification for Ferritic/Austenitic (Duplex) Stainless Steel Pipe

ASTM A928M-08a is for welded pipes made of ferritic/austenitic (duplex) stainless steel, typically including UNS S31803 (2205), S32205, and S32750 (2507).
Weld Consistency with Base Metal: Duplex steels are sensitive to heat input; improper welding and subsequent heat treatment can lead to phase imbalance, affecting corrosion resistance and toughness.
Heat Treatment Requirements: The A928M system typically specifies requirements for solution treatment/heat treatment conditions to restore microstructure and corrosion resistance.
Non-destructive testing (NDT) coverage: For welded pipes, it is recommended to clearly define UT/RT/ET methods and proportions to ensure controllable weld defects.
Corrosion resistance index guidance: For seawater, chlorine-containing media, and H₂S-containing environments, PREN (pitting equivalent) or necessary corrosion testing strategies (determined by project/owner specifications) should be added to the project specifications to avoid ordering solely based on grade.

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