ASTM A955/A955M-09
(Specification)Standard Specification for Deformed and Plain Stainless-Steel Bars for Concrete Reinforcement
Standard Specification for Deformed and Plain Stainless-Steel Bars for Concrete Reinforcement
ABSTRACT
This specification covers deformed and plain stainless steel bars for concrete reinforcement proposed to be used in applications requiring corrosion resistance or controlled magnetic permeability. For each specimen, one tension test, one bend test, if required, and one set of dimensional property tests shall be made. For martensitic materials, two hardness tests shall be performed per lot of material. If the results of the test fail to meet the specified minimum requirements, a retest shall be permitted on two random specimens for each original tension specimen failure from the lot. If a specimen fails a bend test due to reasons other than mechanical or flaws, a retest shall be permitted on two random specimens from the same lot.
SCOPE
1.1 This specification covers deformed and plain stainless-steel bars for concrete reinforcement used in applications requiring resistance to corrosion or controlled magnetic permeability. The standard sizes and dimensions of deformed bars and their numerical designation shall be those listed in Table 1. 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.
1.1.1 Supplementary requirement (S1) of an optional nature is provided. It shall apply only when specified by the purchaser. In order to obtain a controlled magnetic permeability product, steel conforming to Supplementary Requirement S1 should be ordered.
1.2 The chemical composition of the stainless steel alloy shall be selected for suitability to the application involved by agreement between the manufacturer and the purchaser. This is an important consideration in achieving the desired corrosion resistance or controlled magnetic permeability, or both, because these properties are not provided by all stainless steels.
Note 1—The alloys shown in Table 2 have found the most use in North America. Other alloys may also provide desired properties; consult with the manufacturer for stainless steel alloy properties and availability.
1.3 Bars are of three minimum yield strength levels, namely, 40 000 [280 MPa], 60 000 [420 MPa], and 75 000 psi [520 MPa], designated as Grade 40 [280], Grade 60 [420], and Grade 75 [520], respectively.
1.4 Plain rounds in sizes up to and including 2 in. [50.8 mm] in diameter, when specified for dowels, spirals, structural ties, and supports, shall be furnished under this specification in Grade 40 [280], Grade 60 [420], and Grade 75 [520], respectively. Bending properties, when required, shall be by agreement between the manufacturer and purchaser. Requirements providing for deformations and marking shall not be applicable to plain bars.
1.5 Weldability of most stainless steel compositions is generally good, however, pre-weld or post-weld procedures, or both, are necessary. Where material is to be welded, a welding procedure suitable for the chemical composition and intended use or service shall be used. Retesting of physical properties should be considered following welding procedures depending upon the steel composition and welding operation involved.
Note 2—It is recommended that the user consult the manufacturer for information available from the Nickel Development Institute (NIDI) (Toronto, Canada).
1.6 This specification is applicable for orders in either inch-pound units (as Specification A 955) or in SI units (as Specification A 955M).
1.7 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 are not 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.
1.8 This standard does not purport to address all of the safety concerns, if any, associated with its us...
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Designation: A955/A955M – 09
Standard Specification for
Deformed and Plain Stainless-Steel Bars for Concrete
1
Reinforcement
This standard is issued under the fixed designationA955/A955M; 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* 1.5 Weldability of most stainless steel compositions is
generally good, however, pre-weld or post-weld procedures, or
1.1 This specification covers deformed and plain stainless-
both, are necessary. Where material is to be welded, a welding
steel bars for concrete reinforcement used in applications
procedure suitable for the chemical composition and intended
requiring resistance to corrosion or controlled magnetic per-
use or service shall be used. Retesting of physical properties
meability.The standard sizes and dimensions of deformed bars
should be considered following welding procedures depending
and their numerical designation shall be those listed inTable 1.
upon the steel composition and welding operation involved.
The text of this specification references notes and footnotes
which provide explanatory material. These notes and footnotes
NOTE 2—It is recommended that the user consult the manufacturer for
(excluding those in tables and figures) shall not be considered
information available from the Nickel Development Institute (NIDI)
(Toronto, Canada).
as requirements of the specification.
1.1.1 Supplementary requirement (S1) of an optional nature
1.6 This specification is applicable for orders in either
isprovided.Itshallapplyonlywhenspecifiedbythepurchaser.
inch-pound units (as Specification A955) or in SI units (as
In order to obtain a controlled magnetic permeability product,
Specification A955M).
steel conforming to Supplementary Requirement S1 should be
1.7 The values stated in either inch-pound or SI units are to
ordered.
be regarded separately as standard.Within the text, the SI units
1.2 The chemical composition of the stainless steel alloy
are shown in brackets.The values stated in each system are not
shall be selected for suitability to the application involved by
exact equivalents; therefore, each system shall be used inde-
agreement between the manufacturer and the purchaser.This is
pendentlyoftheother.Combiningvaluesfromthetwosystems
an important consideration in achieving the desired corrosion
may result in nonconformance with the standard.
resistance or controlled magnetic permeability, or both, be-
1.8 This standard does not purport to address all of the
cause these properties are not provided by all stainless steels.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
NOTE 1—ThealloysshowninTable2havefoundthemostuseinNorth
priate safety and health practices and determine the applica-
America. Other alloys may also provide desired properties; consult with
the manufacturer for stainless steel alloy properties and availability.
bility of regulatory limitations prior to use.
1.3 Barsareofthreeminimumyieldstrengthlevels,namely,
2. Referenced Documents
40 000 [280 MPa], 60 000 [420 MPa], and 75 000 psi [520
2
2.1 ASTM Standards:
MPa], designated as Grade 40 [280], Grade 60 [420], and
A6/A6M SpecificationforGeneralRequirementsforRolled
Grade 75 [520], respectively.
Structural Steel Bars, Plates, Shapes, and Sheet Piling
1.4 Plainroundsinsizesuptoandincluding2in.[50.8mm]
A276 Specification for Stainless Steel Bars and Shapes
in diameter, when specified for dowels, spirals, structural ties,
A342/A342M Test Methods for Permeability of Feebly
and supports, shall be furnished under this specification in
Magnetic Materials
Grade 40 [280], Grade 60 [420], and Grade 75 [520], respec-
A370 Test Methods and Definitions for Mechanical Testing
tively. Bending properties, when required, shall be by agree-
of Steel Products
ment between the manufacturer and purchaser. Requirements
A484/A484M Specification for General Requirements for
providingfordeformationsandmarkingshallnotbeapplicable
Stainless Steel Bars, Billets, and Forgings
to plain bars.
A510 Specification for General Requirements for Wire
Rods and Coarse Round Wire, Carbon Steel
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. 2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved May 1, 2009. Published May 2009. Originally
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1996. Last previous edition approved in 2007 as
...
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.
Designation:A 955/A 955M–07a Designation: A 955/A 955M – 09
Standard Specification for
Deformed and Plain Stainless-Steel Bars for Concrete
1
Reinforcement
This standard is issued under the fixed designationA 955/A 955M; 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 deformed and plain stainless-steel bars for concrete reinforcement used in applications requiring
resistance to corrosion or controlled magnetic permeability. The standard sizes and dimensions of deformed bars and their
numerical designation shall be those listed in Table 1. 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.
1.1.1 Supplementary requirement (S1) of an optional nature is provided. It shall apply only when specified by the purchaser.
In order to obtain a controlled magnetic permeability product, steel conforming to Supplementary Requirement S1 should be
ordered.
1.2 The chemical composition of the stainless steel alloy shall be selected for suitability to the application involved by
agreement between the manufacturer and the purchaser. This is an important consideration in achieving the desired corrosion
resistance and/oror controlled magnetic permeability, or both, because these properties are not provided by all stainless steels.
steels.
NOTE 1—The alloys shown in Table 2 have found the most use in North America. Other alloys may also provide desired properties; consult with the
manufacturer for stainless steel alloy properties and availability.
1.3 Bars are of three minimum yield strength levels, namely, 40 000 [280 MPa], 60 000 [420 MPa], and 75 000 psi [520 MPa],
designated as Grade 40 [280], Grade 60 [420], and Grade 75 [520], respectively.
1.4 Plain rounds in sizes up to and including 2 in. [50.8 mm] in diameter, when specified for dowels, spirals, structural ties, and
supports, shall be furnished under this specification in Grade 40 [280], Grade 60 [420], and Grade 75 [520], respectively. Bending
properties, when required, shall be by agreement between the manufacturer and purchaser. Requirements providing for
deformations and marking shall not be applicable to plain bars.
1.5 Weldability of most stainless steel compositions is generally good, however, pre-weld or post-weld procedures, or both, are
necessary. Where material is to be welded, a welding procedure suitable for the chemical composition and intended use or service
shall be used. Retesting of physical properties should be considered following welding procedures depending upon the steel
composition and welding operation involved.
NOTE 2—It is recommended that the user consult the manufacturer for information available from the Nickel Development Institute (NIDI) (Toronto,
Canada).
1.6 This specification is applicable for orders in either inch-pound units (as SpecificationA 955) or in SI units (as Specification
A 955M).
1.7 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 are not 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.
1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
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 May 1, 2009. Published July 2007.May 2009. Originally approved in 1996. Last previous edition approved in 2007 as A 995/A 955M -– 07a.
*ASummary 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.
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A 955/A 955M – 09
2. Referenced Documents
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2.1
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