ASTM A955/A955M-11e1
(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.
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 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.
1.5 Plain rounds 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 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.
1.6 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.
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Designation: A955/A955M – 11
Standard Specification for
Deformed and Plain Stainless-Steel Bars for Concrete
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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.
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´ NOTE—Editorial corrections were made to the Summary of Changes in October 2011.
1. Scope* [420], and Grade 75 [520], respectively. Bending properties,
when required, shall be by agreement between the manufac-
1.1 This specification covers deformed and plain stainless-
turer and purchaser. Requirements providing for deformations
steel bars for concrete reinforcement in cut lengths and coils
and marking shall not be applicable to plain bars.
used in applications requiring resistance to corrosion or con-
1.6 Weldability of most stainless steel compositions is
trolled magnetic permeability. The standard sizes and dimen-
generally good, however, pre-weld or post-weld procedures, or
sionsofdeformedbarsandtheirnumericaldesignationshallbe
both, are necessary. Where material is to be welded, a welding
those listed in Table 1. The text of this specification references
procedure suitable for the chemical composition and intended
notes and footnotes which provide explanatory material. These
use or service shall be used. Retesting of physical properties
notesandfootnotes(excludingthoseintablesandfigures)shall
should be considered following welding procedures depending
not be considered as requirements of the specification.
upon the steel composition and welding operation involved.
1.1.1 Supplementary requirement (S1) of an optional nature
isprovided.Itshallapplyonlywhenspecifiedbythepurchaser.
NOTE 2—It is recommended that the user consult the manufacturer for
In order to obtain a controlled magnetic permeability product, information available from the Nickel Development Institute (NIDI)
(Toronto, Canada).
steel conforming to Supplementary Requirement S1 should be
ordered.
1.7 This specification is applicable for orders in either
1.2 The chemical composition of the stainless steel alloy
inch-pound units (as Specification A955) or in SI units (as
shall be selected for suitability to the application involved by
Specification A955M).
agreement between the manufacturer and the purchaser.This is
1.8 The values stated in either inch-pound or SI units are to
an important consideration in achieving the desired corrosion
be regarded separately as standard.Within the text, the SI units
resistance or controlled magnetic permeability, or both, be-
are shown in brackets.The values stated in each system are not
cause these properties are not provided by all stainless steels.
exact equivalents; therefore, each system shall be used inde-
pendentlyoftheother.Combiningvaluesfromthetwosystems
NOTE 1—ThealloysshowninTable2havefoundthemostuseinNorth
may result in nonconformance with the standard.
America. Other alloys may also provide desired properties; consult with
the manufacturer for stainless steel alloy properties and availability. 1.9 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.3 Requirements for the relative deformation area of three-
responsibility of the user of this standard to establish appro-
sided deformed bars are contained in Annex A4.
priate safety and health practices and determine the applica-
1.4 Barsareofthreeminimumyieldstrengthlevels,namely,
bility of regulatory limitations prior to use.
40 000 [280 MPa], 60 000 [420 MPa], and 75 000 psi [520
MPa], designated as Grade 40 [280], Grade 60 [420], and
2. Referenced Documents
Grade 75 [520], respectively.
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2.1 ASTM Standards:
1.5 Plainroundsinsizesuptoandincluding2in.[50.8mm]
A6/A6M SpecificationforGeneralRequirementsforRolled
in diameter in coils or cut lengths, when ordered, shall be
Structural Steel Bars, Plates, Shapes, and Sheet Piling
furnished under this specification in Grade 40 [280], Grade 60
A276 Specification for Stainless Steel Bars and Shapes
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This specification is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
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A01.05 on Steel Reinforcement. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved April 1, 2011. Published May 2011. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1996. Last previous edition approved in 2010 as A955/A955M – 10a. Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/A0955_A0955M-11E01. the ASTM website.
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