1. Scope
1.1 This specification covers a group of cast duplex stainless steels (austenitic/ferritic).
1.2 The duplex stainless steel alloys offer a combination of enhanced mechanical properties and corrosion resistance when properly balanced in composition and properly heat treated. Ferrite levels are not specified, but these alloys will develop a range of approximately 30 to 60% ferrite with the balance austenite.
1.3 The values stated in either inch-pound units or metric (SI) units are to be regarded separately as standard. Within the text the metric (SI) units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
2. Referenced Documents (purchase separately) 
The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A732/A732M Specification for Castings, Investment, Carbon and Low Alloy Steel for General Application, and Cobalt Alloy for High Strength at Elevated Temperatures
A781/A781M Specification for Castings, Steel and Alloy, Common Requirements, for General Industrial Use
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E562 Test Method for Determining Volume Fraction by Systematic Manual Point Count
E1245 Practice for Determining the Inclusion or Second-Phase Constituent Content of Metals by Automatic Image Analysis
Keywords
austenite; duplex stainless steel; ferrite; stainless steel; steel castings; Austenitic stainless steel castings--specifications; Class codes (for metals/alloys); Corrosive service applications--castings; Duplex stainless steel--specifications; Ferritic steel castings--specifications; Iron-chromium castings--specifications; Stainless steel castings--specifications; UNS J93371 (duplex alloy steel casting, 3A); UNS J93372 (cast duplex Cr-Ni-Cu-Mo-N stainless steel); Austenitic stainless steel castings--specifications; Class codes (for metals/alloys); Corrosive service applications--castings; Duplex stainless steel--specifications; Ferritic steel castings--specifications; Iron-chromium castings--specifications; Stainless steel castings--specifications; UNS J93371 (duplex alloy steel casting, 3A); UNS J93372 (cast duplex Cr-Ni-Cu-Mo-N stainless steel)
ICS Code
ICS Number Code 77.140.80 (Iron and steel castings)
DOI: 10.1520/A0890_A0890M-99
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Citing ASTM Standards
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