ASTM A722/A722M-15
(Specification)Standard Specification for High-Strength Steel Bars for Prestressed Concrete
Standard Specification for High-Strength Steel Bars for Prestressed Concrete
ABSTRACT
This specification covers uncoated high-strength steel bars intended for use in pretensioned and post-tensioned prestressed concrete construction or in prestressed ground anchors. Two types of bars are considered: Type I bar, which has a plain surface and Type II bar, which has surface deformations. The bars shall be rolled from properly identified heats of ingot cast or strand cast steel. The bars shall be subjected to cold-stressing and then shall be stress-relieved to produce the prescribed mechanical properties. Yield strength, elongation, and tension tests shall be performed.
SCOPE
1.1 This specification covers Type I and Type II high-strength steel bars intended for use in prestressed concrete construction or in prestressed ground anchors. Type I bars have a plain surface. Type II bars have surface deformations. Bars are of a minimum tensile strength level of 150 000 psi [1035 MPa].
1.2 A supplementary requirement (S1) is provided for use where bend tests of bars are required by the purchaser. The supplementary requirement applies only when specified in the purchase order.
1.3 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification.
1.4 This specification is applicable for orders in either inch-pound units (as Specification A722) or in SI units (as Specification A722M).
1.5 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.
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Designation:A722/A722M −15
Standard Specification for
1
High-Strength Steel Bars for Prestressed Concrete
This standard is issued under the fixed designationA722/A722M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
3
1. Scope* 2.2 Military Standard:
MIL-STD-129Marking for Shipment and Storage
1.1 This specification covers Type I and Type II high-
3
2.3 U.S. Federal Standard:
strength steel bars intended for use in prestressed concrete
Fed. Std. 123Marking for Shipment (Civil Agencies)
constructionorinprestressedgroundanchors.TypeIbarshave
a plain surface. Type II bars have surface deformations. Bars
3. Ordering Information
are of a minimum tensile strength level of 150 000 psi [1035
MPa].
3.1 Orders for high-strength steel bars under this specifica-
tion shall contain the following information:
1.2 A supplementary requirement (S1) is provided for use
3.1.1 Quantity,
where bend tests of bars are required by the purchaser. The
3.1.2 Size and length,
supplementary requirement applies only when specified in the
3.1.3 Type I or Type II, and
purchase order.
3.1.4 ASTM designation A722 [A722M] and year-date of
1.3 The text of this specification references notes and
issue.
footnotes which provide explanatory material.These notes and
3.2 Thepurchasershallhavetheoptiontospecifyadditional
footnotes (excluding those in tables and figures) shall not be
requirements, including but not limited, to the following:
considered as requirements of the specification.
3.2.1 Report on chemical composition (5.1),
1.4 This specification is applicable for orders in either
3.2.2 Special inspection requirements (14.2),
inch-pound units (as Specification A722) or in SI units (as
3.2.3 Load-elongation curve (16.2),
Specification A722M).
3.2.4 Special preparation for delivery, if desired (see Sec-
1.5 The values stated in either inch-pound or SI units are to
tion 17), and
beregardedseparatelyasstandard.Withinthetext,theSIunits
3.2.5 Supplementary requirement (S1).
are shown in brackets. The values stated in each system may
not be exact equivalents; therefore, each system shall be used 4. Materials and Manufacture
independently of the other. Combining values from the two
4.1 Thebarsshallberolledfromproperlyidentifiedheatsof
systems may result in non-conformance with the specification.
mold-cast or strand-cast steel. The standard sizes and dimen-
sions of Type I and II bars shall be those listed in Table 1 and
2. Referenced Documents
Table 2, respectively.
2
2.1 ASTM Standards:
4.2 The bars shall be subjected to cold-stressing to not less
A370Test Methods and Definitions for Mechanical Testing
than 80 % of the minimum tensile strength, and then shall be
of Steel Products
stress-relieved, to produce the prescribed tensile properties.
A700Guide for Packaging, Marking, and Loading Methods
for Steel Products for Shipment
5. Chemical Composition
A751Test Methods, Practices, and Terminology for Chemi-
5.1 A chemical analysis of each heat of steel shall be
cal Analysis of Steel Products
determined in accordance with Test Methods, Practices, and
Terminology A751. The manufacturer shall make the analysis
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
on test samples taken during the pouring of the heat. When
Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee
requested in the purchase order or contract, the chemical
A01.05 on Steel Reinforcement.
Current edition approved April 15, 2015. Published April 2015. Originally
composition determined shall be reported to the purchaser.
approved in 1975. Last previous edition approved in 2012 as A722/A722M–12.
DOI: 10.1520/A0722_A0722M-15.
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. www.dodssp.daps.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
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A722/A722M−15
TABLE 1 Nominal Dimensions for Type I (Plain) Bars
7. Number of Tests
A
Nominal Diameter Nominal Weight (Mass) Nominal Area
7.1 The number of tension test specimens shall be one from
2 2
in. mm lb/ft kg/m in. mm
each39tons[36tonnes]orfractionthereof,ofeachsizeofbar
3
⁄4
...
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: A722/A722M − 12 A722/A722M − 15
Standard Specification for
Uncoated High-Strength Steel Bars for
1
PrestressingPrestressed Concrete
This standard is issued under the fixed designation A722/A722M; 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*
1.1 This specification covers uncoated Type I and Type II high-strength steel bars intended for use in pretensioned and
post-tensioned prestressed concrete construction or in prestressed ground anchors. Type I bars have a plain surface. Type II bars
have surface deformations. Bars are of a minimum ultimate tensile strength level of 1035 MPa (150 000 psi). 150 000 psi [1035
MPa].
1.2 Two types of bars are provided: Type I bar has a plain surface and Type II bar has surface deformations.
1.2 Supplementary requirements of an optional nature are provided. They shall apply A supplementary requirement (S1) is
provided for use where bend tests of bars are required by the purchaser. The supplementary requirement applies only when
specified byin the purchaser. purchase order.
1.3 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the specification.
1.4 This specification is applicable for orders in either inch-pound units (as Specification A722) or in SI units (as Specification
A722M).
1.5 The values stated in either inch-pound or SI units or inch-pound 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.
2. Referenced Documents
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2.1 ASTM Standards:
A370 Test Methods and Definitions for Mechanical Testing of Steel Products
A700 Guide for Packaging, Marking, and Loading Methods for Steel Products for Shipment
E30A751 Test Methods Methods, Practices, and Terminology for Chemical Analysis of Steel, Cast Iron, Open-Hearth Iron, and
Wrought IronSteel Products (Withdrawn 1995)
3
2.2 Government Standards:Military Standard:
MIL-STD-129 Marking for Shipment and Storage
3
2.3 U.S. Federal Standards:Standard:
Fed. Std. 123 Marking for Shipment (Civil Agencies)
3. Ordering Information
3.1 Orders for high-strength steel bars under this specification shall contain the following information:
3.1.1 Quantity,
3.1.2 Size and length,
3.1.3 Type I or Type II, and
3.1.4 ASTM designation A722 [A722M] and year-date of issue.
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 May 1, 2012April 15, 2015. Published May 2012April 2015. Originally approved in 1975. Last previous edition approved in 20072012 as
A722/A722M – 07.A722/A722M – 12. DOI: 10.1520/A0722_A0722M-12.10.1520/A0722_A0722M-15.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
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://www.dodssp.daps.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 ----------------------
A722/A722M − 15
3.2 Orders for material under this specification should include the following information: The purchaser shall have the option
to specify additional requirements, including but not limited, to the following:
3.2.1 Quantity, Report on chemical composition (5.1),
3.1.2 Name of material (uncoated high-strength bars for prestressing concrete),
3.1.3 ASTM designation and year of issue,
3.1.4 Size and length,
3.1.5 Type,
3.2.2 Special inspection requirements, if desired (see Section requirements (1214.2),
3.2.3 Load-elongation curve (16.2),
3.2.4 Special preparation for delivery, if desired (see S
...
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