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 A923 | Section |
| 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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