January 10, 2019

ASTM A890/A890M Standard Specification for Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex (Austenitic/Ferritic) for General Application

ASMT A890/A890M – 18a Standard Specification for Castings, Iron-Chromium-Nickel-Molybdenum Corrosion-Resistant, Duplex (Austenitic/Ferritic) for General Application

Abstract

This specification covers castings, iron-chromium-nickel-molybdenum corrosion-resistant, duplex(austenitic/ferritic) for general application. Castings shall be heat treated in accordance with the required procedure and heat-treat temperature. Proper heat treatment of these alloys is usually necessary to enhance corrosion resistance and in some cases to meet mechanical properties. Minimum heat-treat temperatures are specified; however, it is sometimes necessary to heat-treat at higher temperatures, hold for some minimum time at temperature and then rapidly cool the castings in order to enhance the corrosion resistance and meet the required mechanical properties. The steel shall conform to the required chemical composition for carbon, manganese, silicon, phosphorus, sulfur, chromium, nickel, molybdenum, copper, tungsten, and nitrogen. Castings shall be marked for material identification with the specification designation and grade.

This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

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. It is the responsibility of the purchaser to determine which grade shall be furnished depending on design and service conditions, mechanical properties, and corrosion-resistant characteristics.

NOTE 1: Because of the possibility of precipitation of embrittling phases, the grades included in this specification are not recommended for service at temperatures above 600 °F [315 °C].

1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.

1.3.1 Within the text, the SI units are shown in brackets.

1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

2. Referenced Documents (purchase separately)

ASTM Standards

A781/A781M Specification for Castings, Steel and Alloy, Common Requirements, for General Industrial Use

A957/A957M Specification for Investment Castings, Steel and Alloy, Common Requirements, for General Industrial Use

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

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Martial List defined in ASTM A890/A890M:

ASTM A890 Grade 1A (Type 25Cr-5Ni-Mo-Cu), UNS J93370, ACI CD4MCu

ASTM A890 Grade 1B (Type 25Cr-5Ni-Mo-Cu-N), UNS J93372, ACI CD4MCuN

ASTM A890 Grade 1C (Type 25Cr-6Ni-Mo-Cu-N), UNS J93373, ACI CD3MCuN

ASTM A890 Grade 2A (Type 24Cr-10Ni-Mo-N), UNS J93345, ACI CE8MN

ASTM A890 Grade 3A (Type 25Cr-5Ni-Mo-N), UNS J93371, ACI CD6MN

ASTM A890 Grade 4A (Type 22Cr-5Ni-Mo-N), UNS J92205, ACI CD3MN

ASTM A890 Grade 5A (Type 25Cr-7Ni-Mo-N), UNS J93404, ACI CE3MN

ASTM A890 Grade 6A (Type 25Cr-7Ni-Mo-N), UNS J93380, ACI CD3MWCuN

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