ASTM A955/A955M-16a
(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 in cut lengths and coils 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. (A) The 400 and Duplex-Alloy Series is based on a density of 489.59 lb/ft3 [7833.4 kg/m3 ]. The 300 Series is based on a density of 494.78 lb/ft3 [7916.5 kg/m3]. Density varies with alloy content which may result in a variation of several percent.(B) The nominal dimensions of a deformed bar are equivalent to those of a round bar having the same weight [mass] per foot [metre] as the deformed bar.(C) The maximum gap (measured as a chord) between the ends of the deformations shall not exceed 25 %/n of the nominal perimeter of the bar, where n is the number of longitudinal gaps or longitudinal ribs around the perimeter of the bar.
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. (A) Maximum, unless otherwise indicated.
1.3 Requirements for the relative deformation area of three-sided deformed bars are contained in Annex A4.
1.4 Bars are of two minimum yield strength levels, namely, 60 000 [420 MPa] and 75 000 psi [520 MPa], designated as Grade 60 [420] and Grade 75 [520], respectively.
1.5 Plain bars in sizes up to and including 2 in. [50.8 mm] in diameter in coils or cut lengths, when ordered, shall be furnished under this specification in 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.
1.6 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 c...
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Designation: A955/A955M −16a
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* Requirements providing for deformations and marking shall
not be applicable to plain bars.
1.1 This specification covers deformed and plain stainless-
steel bars for concrete reinforcement in cut lengths and coils 1.6 Weldability of most stainless steel compositions is
used in applications requiring resistance to corrosion or con- generally good, however, pre-weld or post-weld procedures, or
trolled magnetic permeability. The standard sizes and dimen- both, are necessary. Where material is to be welded, a welding
sionsofdeformedbarsandtheirnumericaldesignationshallbe procedure suitable for the chemical composition and intended
those listed in Table 1. The text of this specification references use or service shall be used. Retesting of physical properties
notes and footnotes which provide explanatory material. These should be considered following welding procedures depending
notesandfootnotes(excludingthoseintablesandfigures)shall upon the steel composition and welding operation involved.
not be considered as requirements of the specification.
NOTE 2—It is recommended that the user consult the manufacturer for
1.1.1 Supplementary requirement (S1) of an optional nature
information available from the Nickel Development Institute (NIDI)
isprovided.Itshallapplyonlywhenspecifiedbythepurchaser.
(Toronto, Canada).
In order to obtain a controlled magnetic permeability product,
1.7 This specification is applicable for orders in either
steel conforming to Supplementary Requirement S1 should be
inch-pound units (as Specification A955) or in SI units (as
ordered.
Specification A955M).
1.2 The chemical composition of the stainless steel alloy
1.8 The values stated in either inch-pound or SI units are to
shall be selected for suitability to the application involved by
be regarded separately as standard.Within the text, the SI units
agreement between the manufacturer and the purchaser.This is
are shown in brackets.The values stated in each system are not
an important consideration in achieving the desired corrosion
exact equivalents; therefore, each system shall be used inde-
resistance or controlled magnetic permeability, or both, be-
pendentlyoftheother.Combiningvaluesfromthetwosystems
cause these properties are not provided by all stainless steels.
may result in nonconformance with the standard.
NOTE 1—The alloys shown in Table 2 have found the most use in North
1.9 This standard does not purport to address all of the
America. Other alloys may also provide desired properties; consult with
safety concerns, if any, associated with its use. It is the
the manufacturer for stainless steel alloy properties and availability.
responsibility of the user of this standard to establish appro-
1.3 Requirements for the relative deformation area of three-
priate safety and health practices and determine the applica-
sided deformed bars are contained in Annex A4.
bility of regulatory limitations prior to use.
1.4 Bars are of two minimum yield strength levels, namely,
2. Referenced Documents
60 000 [420 MPa] and 75 000 psi [520 MPa], designated as
2
Grade 60 [420] and Grade 75 [520], respectively.
2.1 ASTM Standards:
A6/A6M Specification for General Requirements for Rolled
1.5 Plain bars in sizes up to and including 2 in. [50.8 mm]
Structural Steel Bars, Plates, Shapes, and Sheet Piling
in diameter in coils or cut lengths, when ordered, shall be
A276 Specification for Stainless Steel Bars and Shapes
furnished under this specification in Grade 60 [420] and Grade
A342/A342M Test Methods for Permeability of Weakly
75 [520], respectively. Bending properties, when required,
Magnetic Materials
shallbebyagreementbetweenthemanufacturerandpurchaser.
A370 Test Methods and Definitions for Mechanical Testing
of Steel Products
1
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
2
A01.05 on Steel Reinforcement. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Sept. 15, 2016. Published September 2016. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1996. Last previous edition approved in 2016 as A955/A955M – 16. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/A0955_A0
...
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: A955/A955M − 16 A955/A955M − 16a
Standard Specification for
Deformed and Plain Stainless-Steel Bars for Concrete
1
Reinforcement
This standard is issued under the fixed designation A955/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*
1.1 This specification covers deformed and plain stainless-steel bars for concrete reinforcement in cut lengths and coils 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 Requirements for the relative deformation area of three-sided deformed bars are contained in Annex A4.
1.4 Bars are of two minimum yield strength levels, namely, 60 000 [420 MPa] and 75 000 psi [520 MPa], designated as Grade
60 [420] and Grade 75 [520], respectively.
1.5 Plain bars in sizes up to and including 2 in. [50.8 mm] in diameter in coils or cut lengths, when ordered, shall be furnished
under this specification in 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.
1.6 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).
1.7 This specification is applicable for orders in either inch-pound units (as Specification A955) or in SI units (as Specification
A955M).
1.8 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.
1.9 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 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 Jan. 15, 2016Sept. 15, 2016. Published January 2016September 2016. Originally approved in 1996. Last previous edition approved in 20152016
as A955/A955M – 15.A955/A955M – 16. DOI: 10.1520/A0955_A0955M-16.10.1520/A0955_A0955M-16A.
*A Summary of Changes section appears at the end of this standard
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