ASTM A421/A421M-21
(Specification)Standard Specification for Stress-Relieved Steel Wire for Prestressed Concrete
Standard Specification for Stress-Relieved Steel Wire for Prestressed Concrete
ABSTRACT
This specification covers two types of uncoated stress-relieved round high-carbon steel wire commonly used in prestressed linear concrete construction. These two types are the type BA used for applications in which cold-end deformation is used for anchoring purposes and type WA wire which is used for application in which the ends are anchored by wedges, no cold-end deformation of the wire is involved. Required tensile strength, yield strength, and elongation shall be evaluated using stress-relaxation test. Heat analysis shall be used to determine the percentage of specified elements especially sulfur and phosphorus to meet the required chemical composition.
SCOPE
1.1 This specification covers two types of stress-relieved round high-carbon steel wire used in prestressed concrete construction, as follows:
1.1.1 Type BA wire is used for applications in which cold-end deformation is used for anchoring purposes (Button Anchorage), and
1.1.2 Type WA wire is used for application in which the ends are anchored by wedges, and no cold-end deformation of the wire is involved (Wedge Anchorage).
1.2 A supplementary requirement (S1) is provided for use where low-relaxation wire and relaxation testing for that product is required by the purchaser. The supplementary requirement applies only when specified in the purchase order or contract.
1.3 This specification is applicable for orders in either inch-pounds units (as Specification A421) or in SI units (as Specification A421M).
1.4 The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. 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 non-conformance with the specification.
1.5 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables) shall not be considered as requirements of the specification.
1.6 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
Buy Standard
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:A421/A421M −21 American Association State
Highway and Transportation Officials Standard
AASHTO No.: M 204
Standard Specification for
1
Stress-Relieved Steel Wire for Prestressed Concrete
This standard is issued under the fixed designationA421/A421M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This specification covers two types of stress-relieved
round high-carbon steel wire used in prestressed concrete
2. Referenced Documents
construction, as follows:
2
2.1 ASTM Standards:
1.1.1 Type BA wire is used for applications in which
A370 Test Methods and Definitions for Mechanical Testing
cold-end deformation is used for anchoring purposes (Button
of Steel Products
Anchorage), and
A751 Test Methods and Practices for Chemical Analysis of
1.1.2 TypeWAwireisusedforapplicationinwhichtheends
Steel Products
are anchored by wedges, and no cold-end deformation of the
E328 Test Methods for Stress Relaxation for Materials and
wire is involved (Wedge Anchorage).
Structures
3
2.2 Military Standard:
1.2 A supplementary requirement (S1) is provided for use
MIL-STD-129 Marking for Shipment and Storage
where low-relaxation wire and relaxation testing for that
3
2.3 Federal Standard:
product is required by the purchaser. The supplementary
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
requirement applies only when specified in the purchase order
or contract.
3. Ordering Information
1.3 This specification is applicable for orders in either
3.1 Orders for stress-relieved steel wire under this specifi-
inch-pounds units (as Specification A421) or in SI units (as
cation shall contain the following information:
Specification A421M).
3.1.1 Quantity (feet [metres]),
1.4 The values stated in either inch-pound or SI units are to 3.1.2 Nominal diameter (inches [millimetres]),
be regarded separately as standard.Within the text, the SI units 3.1.3 Type BA or WA wire, and
are shown in brackets. The values stated in each system may 3.1.4 ASTM designation A421 [A421M] and year of issue.
not be exact equivalents; therefore, each system shall be used
3.2 Thepurchasershallhavetheoptiontospecifyadditional
independently of the other. Combining values from the two
requirements, including but not limited to, the following:
systems may result in non-conformance with the specification.
3.2.1 Sampling—number of test specimens (9.1),
3.2.2 Requirements for inspection (10.1),
1.5 The text of this specification references notes and
footnotes which provide explanatory material. These notes and 3.2.3 Package marking (13.2),
footnotes (excluding those in tables) shall not be considered as 3.2.4 Relaxation evidence on similarly dimensioned wire of
requirements of the specification. the same grade (S1.5.1), and
3.2.5 Other special requirements, if any.
1.6 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4. Manufacture
ization established in the Decision on Principles for the
4.1 Process—The steel shall be made by any commercially
Development of International Standards, Guides and Recom-
accepted process.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel, contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee Standards volume information, refer to the standard’s Document Summary page on
A01.05 on Steel Reinforcement. the ASTM website.
3
Current edition approved May 1, 2021. Published May 2021. Originally Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
approved in 1958. Last previous edition approved in 2015 as A421/A421M – 15. Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
DOI: 10.1520/A0421_A0421M-21. dodssp.daps.dla.mil.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A421/A421M−21
TABLE 1 Tensile Strength Requirements
6. Diameter and Permissible Variations
Nominal Tensile Strength, min, psi [MPa]
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: A421/A421M − 15 A421/A421M − 21 American Association State
Highway and Transportation Officials Standard
AASHTO No.: M 204
Standard Specification for
1
Stress-Relieved Steel Wire for Prestressed Concrete
This standard is issued under the fixed designation A421/A421M; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 This specification covers two types of stress-relieved round high-carbon steel wire commonly used in prestressed concrete
construction, as follows:
1.1.1 Type BA wire is used for applications in which cold-end deformation is used for anchoring purposes (Button Anchorage),
and
1.1.2 Type WA wire is used for application in which the ends are anchored by wedges, and no cold-end deformation of the wire
is involved (Wedge Anchorage).
1.2 A supplementary requirement (S1) is provided for use where low-relaxation wire and relaxation testing for that product is
required by the purchaser. The supplementary requirement applies only when specified in the purchase order.order or contract.
1.3 This specification is applicable for orders in either inch-pounds units (as Specification A421) or in SI units (as Specification
A421M).
1.4 The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, the SI units are
shown in brackets. 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 non-conformance with the specification.
1.5 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables) shall not be considered as requirements of the specification.
1.6 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.
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee A01.05
on Steel Reinforcement.
Current edition approved Nov. 1, 2015May 1, 2021. Published November 2015May 2021. Originally approved in 1958. Last previous edition approved in 20102015 as
A421/A421M – 10.A421/A421M – 15. DOI: 10.1520/A0421_A0421M-15.10.1520/A0421_A0421M-21.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
A421/A421M − 21
2. Referenced Documents
2
2.1 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A751 Test Methods and Practices for Chemical Analysis of Steel Products
E328 Test Methods for Stress Relaxation for Materials and Structures
3
2.2 Military Standard:
MIL-STD-129 Marking for Shipment and Storage
3
2.3 Federal Standard:
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
3. Ordering Information
3.1 Orders for stress-relieved steel wire under this specification shall contain the following information:
3.1.1 Quantity (feet [metres]),
3.1.2 Nominal diameter (inches [millimetres]),
3.1.3 Type BA or WA wire, and
3.1.4 ASTM designation A421 [A421M] and year of issue.
3.2 It The purchaser shall be the responsibility of the purchaser to specify all requirements that are necessary for material ordered
to this specification. Such requirements shall include, but are have the option to specify additional requirements, including but not
limited to, the following:
3.1.1 Quantity lb [kg],
3.1.2 Nominal diameter,
3.2.1 Name of material (uncoated stress-relieved Sampling—number of test specimens (9.1steel wire for prestressed concrete,
Type BA or WA wire),),
3.2.2 If outside inspection is required Requirements for inspection (10.1),
3.2.3 Packaging, Package marking (13.2),
3.2.4 Supplementary Requirement S1 (if desired), Relaxation evidence on similarly dimensioned wire of the same grade (S1.5.1),
and
3.2.5
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.