ASTM A909/A909M-06(2021)
(Specification)Standard Specification for Steel Forgings, Microalloy, for General Industrial Use
Standard Specification for Steel Forgings, Microalloy, for General Industrial Use
SCOPE
1.1 This specification covers wrought, microalloyed carbon steel forgings for industrial use. Microalloyed steels develop their properties by the addition of small amounts of microalloying elements such as vanadium, columbium, titanium, or molybdenum. The properties may be influenced also by control of the hot working process and temperature and by control of the subsequent cooling rate.
1.2 The forgings shall be furnished to chemical composition and mechanical property requirements as specified herein. Chemical composition is based on standard carbon steel grades modified to include microalloying elements. Strength level is specified based on desired mechanical properties in the forgings. Depending on the forging process, different strength classes may be attainable from a single chemical composition. Conversely, mechanical properties of a given strength class may be achieved using different chemical compositions. The manufacturer should be consulted if development of chemical composition is necessary.
1.3 For the purpose of this specification, forgings with maximum section thickness of 4 in. [100 mm] are to be considered.
1.4 Supplementary Requirements S1 to S8 are provided for use when additional controls or requirements are desired. These shall apply only when specified on the purchase order.
1.5 The values stated in either inch-pound units or SI (metric) units are to be regarded separately as standard. Within the text and tables, SI units are shown in brackets. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.
1.6 Unless the order specifies the applicable “M” specification designation, the material shall be furnished to the inch-pound units.
1.7 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.
General Information
Standards Content (Sample)
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.
Designation: A909/A909M −06 (Reapproved 2021)
Standard Specification for
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Steel Forgings, Microalloy, for General Industrial Use
This standard is issued under the fixed designationA909/A909M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* 1.7 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This specification covers wrought, microalloyed carbon
ization established in the Decision on Principles for the
steel forgings for industrial use. Microalloyed steels develop
Development of International Standards, Guides and Recom-
their properties by the addition of small amounts of microal-
mendations issued by the World Trade Organization Technical
loying elements such as vanadium, columbium, titanium, or
Barriers to Trade (TBT) Committee.
molybdenum.Thepropertiesmaybeinfluencedalsobycontrol
of the hot working process and temperature and by control of
2. Referenced Documents
the subsequent cooling rate.
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2.1 ASTM Standards:
1.2 The forgings shall be furnished to chemical composition
A29/A29M SpecificationforGeneralRequirementsforSteel
and mechanical property requirements as specified herein.
Bars, Carbon and Alloy, Hot-Wrought
Chemical composition is based on standard carbon steel grades
A275/A275M Practice for Magnetic Particle Examination of
modified to include microalloying elements. Strength level is
Steel Forgings
specified based on desired mechanical properties in the forg-
A370 Test Methods and Definitions for Mechanical Testing
ings. Depending on the forging process, different strength
of Steel Products
classes may be attainable from a single chemical composition.
A576 Specification for Steel Bars, Carbon, Hot-Wrought,
Conversely, mechanical properties of a given strength class
Special Quality
may be achieved using different chemical compositions. The
A751 Test Methods and Practices for Chemical Analysis of
manufacturer should be consulted if development of chemical
Steel Products
composition is necessary.
A788/A788M Specification for Steel Forgings, General Re-
1.3 For the purpose of this specification, forgings with
quirements
maximum section thickness of 4 in. [100 mm] are to be A921/A921M Specification for Steel Bars, Microalloy, Hot-
considered.
Wrought, Special Quality, for Subsequent Hot Forging
E10 Test Method for Brinell Hardness of Metallic Materials
1.4 Supplementary Requirements S1 to S8 are provided for
E18 Test Methods for Rockwell Hardness of Metallic Ma-
use when additional controls or requirements are desired.
terials
These shall apply only when specified on the purchase order.
E45 Test Methods for Determining the Inclusion Content of
1.5 The values stated in either inch-pound units or SI
Steel
(metric) units are to be regarded separately as standard. Within
the text and tables, SI units are shown in brackets. The values
3. Terminology
stated in each system are not necessarily exact equivalents;
3.1 Definitions of Terms Specific to This Standard:
therefore, to ensure conformance with the standard, each
3.1.1 microalloy forgings—forgings from microalloyed
system shall be used independently of the other, and values
steels produced by effectively controlling the thermomechani-
from the two systems shall not be combined.
cal components of the forging process to achieve required
1.6 Unless the order specifies the applicable “M” specifica-
mechanical properties with no post-forging heat treatment.
tion designation, the material shall be furnished to the inch-
3.1.2 microalloy forging procedure—the written thermo-
pound units.
mechanical processing parameters to be followed during the
production of a microalloy forging. It would include, but is not
limited to: starting stock size; chemical composition, including
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This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
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A01.06 on Steel Forgings and Billets. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved March 1, 2021. Published March 2021. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1992. Last previous edition approved in 2016 as A909/A909M – 06 Standards volume information, refer to the standard’s Document Summary page on
(2016). DOI: 10.1520/A0909_A0909M-06R21. the ASTM website.
*A Summary of Changes section appear
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