استاندارد ASTM A890

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Standard Specification for Castings, Iron-Chromium-Nickel-Molybdenum Corrosion  Resistant, Duplex (Austenitic/Ferritic) for

General Application1

Scope
۱٫۱ This specification covers a group of cast duplex stainless
steels (austenitic/ferritic).
۱٫۲ 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.
۱٫۳ 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.

۲٫ Referenced Documents
۲٫۱ ASTM Standards:

A 370 Test Methods and Definitions for Mechanical Testing
of Steel Products
A 732/A732M Specification for Castings, Investment, Carbon
and Low-Alloy Steel for General Application, and
Cobalt Alloy for High Strength at Elevated Temperatures3
A 781/A781M Specification for Castings, Steel and Alloy,
Common Requirements, for General Industrial Use3
E 29 Practice for Using Significant Digits in Test Data to
Determine Conformance With Specifications4
E 562 Practice for Determining Volume Fraction by Systematic
Manual Point Count5
E 1245 Practice for Determining the Inclusion or Second-
Phase Constituent Content of Metals by Automatic Image
Analysis5

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