ASTM A923 Detrimental Intermetallic Phase in Duplex Ferritic Stainless Steels

ASTM A923 Detrimental Intermetallic Phase in Duplex Ferritic Stainless Steels

The goal of these test methods, ASTM A923, is to determine the existence of intermetallic phases in duplex stainless steels that have a significant impact on the toughness or corrosion resistance. The values given in inch-pound or SI units should be considered as standard.

    Scope:

    ASTM A923 test methods are used to detect a harmful intermetallic phase in duplex austenitic/ferritic stainless steel that significantly impacts its toughness and corrosion resistance. There are three test methods described in ASTM A923 to classify duplex stainless steel structures: Sodium hydroxide etch test, Charpy impact test, and ferric chloride corrosion test.

    Procedure:

    Test methods in ASTM A923Section
    Test method A (SODIUM HYDROXIDE ETCH TEST)3-7
    Test method B (CHARPY IMPACT TEST)8-13
    Test method C (C—FERRIC CHLORIDE CORROSION TEST)14-20

    Result

    Based on the recorded corrosion rate in comparison to the established acceptance criteria, the test result is reported as passed or failed.

    Conclusion:

    ASTM A923 test methods are used to detect a harmful intermetallic phase in duplex austenitic/ferritic stainless steel that significantly impacts its toughness and corrosion resistance.

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