ASTM A421/A421M-10
(Specification)Standard Specification for Uncoated Stress-Relieved Steel Wire for Prestressed Concrete
Standard Specification for Uncoated 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 uncoated stress-relieved round high-carbon steel wire commonly used in prestressed linear 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.
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 standard.
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Designation:A421/A421M −10 AmericanAssociation State
Highway and Transportation Officials Standard
AASHTO No.: M 204
Standard Specification for
Uncoated Stress-Relieved Steel Wire for Prestressed
1
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 Department of Defense.
1. Scope* A751 Test Methods, Practices, and Terminology for Chemi-
cal Analysis of Steel Products
1.1 This specification covers two types of uncoated stress-
E328 Test Methods for Stress Relaxation for Materials and
relieved round high-carbon steel wire commonly used in
Structures
prestressed linear concrete construction, as follows:
3
1.1.1 Type BA wire is used for applications in which 2.2 Military Standard:
cold-end deformation is used for anchoring purposes (Button MIL-STD-129 Marking for Shipment and Storage
3
Anchorage), and
2.3 Federal Standard:
1.1.2 TypeWAwireisusedforapplicationinwhichtheends
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
are anchored by wedges, and no cold-end deformation of the
wire is involved (Wedge Anchorage).
3. Ordering Information
1.2 A supplementary requirement (S1) is provided for use
3.1 It shall be the responsibility of the purchaser to specify
where low-relaxation wire and relaxation testing for that
all requirements that are necessary for material ordered to this
product is required by the purchaser. The supplementary
specification. Such requirements shall include, but are not
requirement applies only when specified in the purchase order.
limited to, the following:
1.3 This specification is applicable for orders in either
3.1.1 Quantity lb [kg],
inch-pounds units (as Specification A421) or in SI units (as
3.1.2 Nominal diameter,
Specification A421M).
3.1.3 Name of material (uncoated stress-relieved steel wire
1.4 The values stated in either inch-pound or SI units are to
for prestressed concrete, Type BA or WA wire),
be regarded separately as standard.Within the text, the SI units
3.1.4 If outside inspection is required (10.1),
are shown in brackets. The values stated in each system may
3.1.5 Packaging,
not be exact equivalents; therefore, each system shall be used
3.1.6 Supplementary Requirement S1 (if desired), and
independently of the other. Combining values from the two
3.1.7 ASTM designation and date of issue.
systems may result in non-conformance with the standard.
4. Manufacture
2. Referenced Documents
4.1 Process—The steel shall be made by the electric-arc
2
2.1 ASTM Standards:
furnace, basic-oxygen, or open-hearth process.
A370 Test Methods and Definitions for Mechanical Testing
4.2 Internal Soundness—A sufficient discard shall be made
of Steel Products
to ensure freedom from injurious piping and undue segrega-
tion.
1
This specification is under the jurisdiction of ASTM Committee A01 on Steel,
4.3 Wire—The wire shall be cold-drawn to size and suitably
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
stress-relieved after cold drawing by a continuous heat treat-
A01.05 on Steel Reinforcement.
ment to produce the prescribed mechanical properties.
Current edition approved Nov. 1, 2010. Published December 2010. Originally
approved in 1958. Last previous edition approved in 2005 as A421/A421M – 05.
DOI: 10.1520/A0421_A0421M-10.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
Standards volume information, refer to the standard’s Document Summary page on Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
the ASTM website. 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−10
TABLE 2 Yield Strength Requirements
5. Mechanical Property Requirements
Minimum Stress at 1 %
Nominal
5.1 Tensile Strength—The tensile strength of Type BA wire
Initial Stress,
Extension, psi [MPa]
Diameter,
psi [MPa]
and Type WA wire shall conform to the requirements pre-
in. [mm]
Type BA Type WA
scribed in Table 1, and shall be determined as prescribed in
A
0.192 [4.88] 29 000 [200] 212 500 [1465]
Test Methods and Definitions A370, including Annex A4.
0.196 [4.98] 29 000 [200] 204 000 [1407] 212 500 [1465]
0.250 [6.35] 29 000 [200] 204 000 [1407] 204 000
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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.
American Association State
Designation:A421/A421M–05 Designation: A421/A421M – 10 Highway and Transportation Officials Standard
AASHTO No.: M 204
Standard Specification for
Uncoated Stress-Relieved Steel Wire for Prestressed
1
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 Department of Defense.
1. Scope*
1.1 This specification covers two types of uncoated stress-relieved round high-carbon steel wire commonly used in prestressed
linear concrete construction, as follows:
1.1.1 Type BA wire is used for applications in which cold-end deformation is used for anchoring purposes (ButtonAnchorage),
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).
1.2Supplement I describes low relaxation wire and relaxation testing for that product.
1.3The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, the inch-pound
unitsareshowninparentheses.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeused
independently of the other. Combining values from the two systems may result in non-conformance with the standard.
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.
1.3 This specification is applicable for orders in either inch-pounds units (as SpecificationA421) 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 standard.
2. Referenced Documents
2
2.1 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
E30Test Methods for Chemical Analysis of Steel, Cast Iron, Open-Hearth Iron, and Wrought Iron
E328 Test Methods for Stress Relaxation for Materials and Structures
3
2.2 Military Standards: Military Standard:
MIL-STD-129Marking for Shipment and Storage
MIL-STD-163Steel Mill Products, Preparation for Shipment and Storage Marking for Shipment and Storage
3
2.3 Federal Standard:
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
3. Ordering Information
3.1It 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 not limited to, the following:
3.1.1Quantity (kg [lb]),
3.1.2Diameter,
1
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of SubcommitteeA01.05
on Steel Reinforcement.
Current edition approved MarchNov. 1, 2005.2010. Published March 2005.December 2010. Originally approved in 1958. Last previous edition approved in 20022005 as
A421/A421M – 025. DOI: 10.1520/A0421_A0421M-105.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. ForAnnualBookofASTMStandards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://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 – 10
3.1.3Type of anchorage (BA or WA),
3.1.4Packaging,
3.1.5ASTM designation and date of issue, and
3.1.6Special requirements, if any.
NOTE1—Atypical ordering description is as follows: 10 000 kg of 6.35-mm diameter wire, Type BAin approximately 450 kg 1.5-m diameter coi
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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.
American Association State
Designation:A421/A421M–05 Designation: A421/A421M – 10 Highway and Transportation Officials Standard
AASHTO No.: M 204
Standard Specification for
Uncoated Stress-Relieved Steel Wire for Prestressed
1
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 Department of Defense.
1. Scope*
1.1 This specification covers two types of uncoated stress-relieved round high-carbon steel wire commonly used in prestressed
linear concrete construction, as follows:
1.1.1 Type BA wire is used for applications in which cold-end deformation is used for anchoring purposes (ButtonAnchorage),
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).
1.2Supplement I describes low relaxation wire and relaxation testing for that product.
1.3The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, the inch-pound
unitsareshowninparentheses.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeused
independently of the other. Combining values from the two systems may result in non-conformance with the standard.
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.
1.3 This specification is applicable for orders in either inch-pounds units (as SpecificationA421) 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 standard.
2. Referenced Documents
2
2.1 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
E30Test Methods for Chemical Analysis of Steel, Cast Iron, Open-Hearth Iron, and Wrought Iron
E328 Test Methods for Stress Relaxation for Materials and Structures
3
2.2 Military Standards: Military Standard:
MIL-STD-129Marking for Shipment and Storage
MIL-STD-163 Steel Mill Products, Preparation for Shipment and Storage Marking for Shipment and Storage
3
2.3 Federal Standard:
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
3. Ordering Information
3.1It 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 not limited to, the following:
3.1.1Quantity (kg [lb]),
3.1.2Diameter,
1
This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of SubcommitteeA01.05
on Steel Reinforcement.
Current edition approved MarchNov. 1, 2005.2010. Published March 2005.December 2010. Originally approved in 1958. Last previous edition approved in 20022005 as
A421/A421M – 025. DOI: 10.1520/A0421_A0421M-105.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. ForAnnualBookofASTMStandards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://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 – 10
3.1.3Type of anchorage (BA or WA),
3.1.4Packaging,
3.1.5ASTM designation and date of issue, and
3.1.6Special requirements, if any.
NOTE1—Atypical ordering description is as follows: 10 000 kg of 6.35-mm diameter wire, Type BAin approximately 450 kg 1.5-m diameter co
...
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