ASTM A923 Test Methods for Detecting Detrimental Intermetallic Phase in Duplex Stainless Steel
This is issued under the fixed designation ASTM A923; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
The purpose of these test methods is to allow detection of the presence of intermetallic phases in duplex stainless steel to the extent that toughness or corrosion resistance is affected significantly. These test methods will not necessarily detect losses of toughness or corrosion resistance attributable to other causes.
Duplex stainless steel are susceptible to the formation of intermetallic compounds during exposures in the temperature range from approximately 600 to 1750°F (320 to 955°C). The speed of these precipitation reactions is a function of composition and thermal or thermomechanical history of each individual piece. The presence of these phases is detrimental to toughness and corrosion resistance.
Correct heat treatment of duplex stainless steel can eliminate these detrimental phases. Rapid cooling of the product provides the maximum resistance to formation of detrimental phases by subsequent thermal exposures.
Compliance with the chemical and mechanical requirements for the applicable product specification does not necessarily indicate the absence of detrimental phases in the product.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Referenced Documents
ASTM Standards: A 370 Test Methods and Definitions for Mechanical Testing of Steel Products2
G 48 Test Methods for Pitting and Crevice of Stainless Steel Corrosion Resistance and Related Alloys by Use of Ferric Chloride Solution
Test Method A - Sodium Hydoxide Etch
Test For Classification of Etch
Structures of Stuctures of Duplex Stainless Steel Pipe
 ASTM A923 Standard Test Methods for Detecting Detrimental Intermetallic Phase in Duplex Austenitic/Ferritic Stainless Steel
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