ASTM A955/A955M-17a
(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.
TABLE 1 Deformed Bar Designation Numbers, Nominal Weights [Masses], Nominal Dimensions, and Deformation Requirements
Bar
Designation
No.
Nominal Weight, lb/ft [Nominal Mass, kg/m]A
Nominal DimensionsB
Deformation Requirements, in. [mm]
400 Series; Duplex Alloys
300 Series
Diameter, in. [mm]
Cross-Sectional Area, in.2 [mm2]
Perimeter, in. [mm]
Maximum Average Spacing
Minimum Average Height
Maximum Gap per SideC
Two-Sided
Bar
Three-Sided
Bar
3 [10]
0.374 [0.556]
0.378 [0.562]
0.375 [9.5]
0.11 [71]
1.178 [29.9]
0.262 [6.7]
0.015 [0.38]
0.143 [3.6]
0.097 [2.5]
4 [13]
0.679 [1.011]
0.686 [1.021]
0.500 [12.7]
0.20 [129]
1.571 [39.9]
0.350 [8.9]
0.020 [0.51]
0.191 [4.9]
0.129 [3.3]
5 [16]
1.048 [1.559]
1.058 [1.575]
0.625 [15.9]
0.31 [199]
1.963 [49.9]
0.437 [11.1]
0.028 [0.71]
0.239 [6.1]
0.162 [4.1]
6 [19]
1.495 [2.225]
1.511 [2.248]
0.750 [19.1]
0.44 [284]
2.356 [59.8]
0.525 [13.3]
0.038 [0.97]
0.286 [7.3]
0.194 [4.9]
7 [22]
2.038 [3.032]
2.059 [3.064]
0.875 [22.2]
0.60 [367]
2.749 [69.8]
0.612 [15.5]
0.044 [1.12]
0.334 [8.5]
0.226 [5.8]
8 [25]
2.685 [3.995]
2.713 [4.037]
1.000 [25.4]
0.79 [510]
3.142 [79.8]
0.700 [17.8]
0.050 [1.27]
0.383 [9.7]
0.259 [6.6]
9 [29]
3.396 [5.053]
3.441 [5.106]
1.128 [28.7]
1.00 [645]
3.544 [90.0]
0.790 [20.1]
0.056 [1.42]
0.431 [10.9]
0.292 [7.4]
10 [32]
4.312 [6.416]
4.358 [6.484]
1.270 [32.3]
1.27 [819]
3.990 [101.3]
0.889 [22.6]
0.064 [1.63]
0.487 [12.4]
0.329 [8.3]
11 [36]
5.296 [7.880]
5.352 [7.964]
1.410 [35.8]
1.56 [1006]
4.430 [112.5]
0.987 [25.1]
0.071 [1.80]
0.540 [13.7]
0.365 [9.3]
14 [43]
7.64 [11.37]
7.72 [11.49]
1.693 [43.0]
2.25 [1452]
5.32 [135.1]
1.185 [30.1]
0.085 [2.16]
0.648 [16.5]
0.438 [11.1]
18 [57]
13.59 [20.22]
13.72 [20.43]
2.257 [57.3]
4.00 [2581]
7.09 [180.1]
1.58 [40.1]
0.102 [2.59]
0.864 [21.9]
0.584 [14.8](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 ...
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Designation: A955/A955M −17a
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 When stainless steel is to be welded, use a procedure
used in applications requiring resistance to corrosion or con- suitable for the chemical composition and intended use or
trolled magnetic permeability. The standard sizes and dimen- service.
sionsofdeformedbarsandtheirnumericaldesignationshallbe
NOTE 2—Welding of stainless steel reinforcement would occur after
those listed in Table 1. The text of this specification references
shipment from the producer. Structural welding should be performed in
notes and footnotes which provide explanatory material. These
accordance with the latest edition of AWS D1.6/D1.6M, any other
internationally accepted stainless steel welding code, or a procedure
notesandfootnotes(excludingthoseintablesandfigures)shall
suggested by the material producer. AWS D1.6/D1.6M describes the
not be considered as requirements of the specification.
proper selection of the filler metals, temperature control, as well as,
1.1.1 Supplementary requirement (S1) of an optional nature
performance, procedure qualification and inspection requirements.
isprovided.Itshallapplyonlywhenspecifiedbythepurchaser.
1.7 This specification is applicable for orders in either
In order to obtain a controlled magnetic permeability product,
inch-pound units (as Specification A955) or in SI units (as
steel conforming to Supplementary Requirement S1 should be
Specification A955M).
ordered.
1.8 The values stated in either inch-pound or SI units are to
1.2 The chemical composition of the stainless steel alloy
be regarded separately as standard.Within the text, the SI units
shall be selected for suitability to the application involved by
are shown in brackets.The values stated in each system are not
agreement between the manufacturer and the purchaser.This is
exact equivalents; therefore, each system shall be used inde-
an important consideration in achieving the desired corrosion
pendentlyoftheother.Combiningvaluesfromthetwosystems
resistance or controlled magnetic permeability, or both, be-
may result in nonconformance with the standard.
cause these properties are not provided by all stainless steels.
1.9 This specification does not purport to address all of the
NOTE 1—The alloys shown in Table 2 have found the most use in North
safety concerns, if any, associated with its use. It is the
America. Other alloys may also provide desired properties; consult with
responsibility of the user of this specification to establish
the manufacturer for stainless steel alloy properties and availability.
appropriate safety, health and environmental practices and
1.3 Requirements for the relative deformation area of three-
determine the applicability of regulatory limitations prior to
sided deformed bars are contained in Annex A4.
use.
1.4 Bars are of two minimum yield strength levels, namely,
1.10 This international standard was developed in accor-
60 000 [420 MPa] and 75 000 psi [520 MPa], designated as
dance with internationally recognized principles on standard-
Grade 60 [420] and Grade 75 [520], respectively.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
1.5 Plain bars in sizes up to and including 2 in. [50.8 mm]
mendations issued by the World Trade Organization Technical
in diameter in coils or cut lengths, when ordered, shall be
Barriers to Trade (TBT) Committee.
furnished under this specification in Grade 60 [420] and Grade
75 [520], respectively. Bending properties, when required,
2. Referenced Documents
shallbebyagreementbetweenthemanufacturerandpurchaser.
2
2.1 ASTM Standards:
A6/A6M Specification for General Requirements for Rolled
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. 1, 2017. Published September 2017. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1996. Last previous edition approved in 2017 as A955/
...
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 − 17 A955/A955M − 17a
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 When stainless steel compositions is generally good, however, pre-weld or post-weld procedures, or
both, are necessary. Where material is is to be welded, use 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. service.
NOTE 2—It is recommended that the user consult the manufacturer for information available from the Nickel Development Institute (NIDI) (Toronto,
Canada). Welding of stainless steel reinforcement would occur after shipment from the producer. Structural welding should be performed in accordance
with the latest edition of AWS D1.6/D1.6M, any other internationally accepted stainless steel welding code, or a procedure suggested by the material
producer. AWS D1.6/D1.6M describes the proper selection of the filler metals, temperature control, as well as, performance, procedure qualification and
inspection requirements.
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
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 March 15, 2017Sept. 1, 2017. Published April 2017September 2017. Originally approved in 1996. Last previous edition approved in 20162017
as A955/A955M – 16a.A955/A955M – 17. DOI: 10.1520/A0955_A0955M-17.1
...
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