ASTM A955/A955M-20c
(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 austenitic and duplex (austenitic/duplex) stainless steel bars for concrete reinforcement proposed to be used in applications requiring corrosion resistance, controlled tensile properties 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. 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, restrictive mechanical properties, or controlled magnetic permeability. This specification has a minimum actual tensile strength to actual yield strength ratio (Table 3). The standard sizes and dimensions of deformed bars and their numerical designation shall be those listed in Table 1.
1.1.1 A supplementary requirement (S1) is provided for use where a controlled magnetic permeability product is required by the purchaser. Supplementary Requirement S1 applies only when specified in the purchase order.
1.1.2 A supplementary controlled mechanical properties requirement (S2) is provided for use where a restricted yield strength range and a higher actual tensile to actual yield strength ratio is required by the purchaser. Supplementary Requirement S2 applies only when specified in the purchase order.
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.
1.3 Corrosion Resistance requirements are contained in Section 11 and Annex A1 and the test procedures options are Annex A2 (Rapid Macrocell Test) or Annex A3 (Cracked Beam Test).
1.4 The requirements for introduction of new alloys into a mandatory chemical composition requirements table in this specification are given in Annex A5.
1.5 Requirements for the relative deformation area of three-sided deformed bars are contained in Annex A4.
1.6 Bars are of three minimum yield strength levels, namely, 60 000 psi [420 MPa], 75 000 psi [520 MPa], and 80 000 psi [550 MPa], designated as Grade 60 [420], Grade 75 [520], or Grade 80 [550], respectively.
1.7 Plain bars in sizes up to and including 2 in. [50.8 mm] in diameter in coils or cut lengths are furnished in accordance with this specification in Grade 60 [420], Grade 75 [520], and Grade 80 [550], respectively. Mechanical testing, when required, shall be to the nearest nominal deformed bar size. Requirements providing for deformations and marking shall not be applicable to plain bars.
1.8 When stainless steel is to be welded, use a procedure suitable for the chemical composition and intended use or service.
Note 1: Welding of stainless steel reinforcement would occur after shipment from the manufacturer. 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 manufacturer. AWS D1.6/D1.6M describes the proper selection of the filler metals, temperature control, as well as, performance, procedure qualification and inspection requirements.
1.9 This specification is applicable for orders in either inch-pound units (as Specification A955) or in SI units (as Specification A955M).
1.10 The text of this specification references notes and ...
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:A955/A955M −20c
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* 1.6 Barsareofthreeminimumyieldstrengthlevels,namely,
60 000 psi [420 MPa], 75 000 psi [520 MPa], and 80 000 psi
1.1 This specification covers deformed and plain stainless
[550 MPa], designated as Grade 60 [420], Grade 75 [520], or
steel bars for concrete reinforcement in cut lengths and coils
Grade 80 [550], respectively.
used in applications requiring resistance to corrosion, restric-
tive mechanical properties, or controlled magnetic permeabil-
1.7 Plain bars in sizes up to and including 2 in. [50.8 mm]
ity. This specification has a minimum actual tensile strength to
in diameter in coils or cut lengths are furnished in accordance
actual yield strength ratio (Table 3). The standard sizes and
with this specification in Grade 60 [420], Grade 75 [520], and
dimensions of deformed bars and their numerical designation
Grade 80 [550], respectively. Mechanical testing, when
shall be those listed in Table 1.
required, shall be to the nearest nominal deformed bar size.
1.1.1 Asupplementary requirement (S1) is provided for use
Requirements providing for deformations and marking shall
where a controlled magnetic permeability product is required
not be applicable to plain bars.
by the purchaser. Supplementary Requirement S1 applies only
1.8 When stainless steel is to be welded, use a procedure
when specified in the purchase order.
suitable for the chemical composition and intended use or
1.1.2 A supplementary controlled mechanical properties
service.
requirement (S2) is provided for use where a restricted yield
strength range and a higher actual tensile to actual yield
NOTE 1—Welding of stainless steel reinforcement would occur after
strength ratio is required by the purchaser. Supplementary
shipment from the manufacturer. Structural welding should be performed
Requirement S2 applies only when specified in the purchase
in accordance with the latest edition of AWS D1.6/D1.6M, any other
order. internationally accepted stainless steel welding code, or a procedure
suggested by the material manufacturer. AWS D1.6/D1.6M describes the
1.2 The chemical composition of the stainless steel alloy
proper selection of the filler metals, temperature control, as well as,
shall be selected for suitability to the application involved by
performance, procedure qualification and inspection requirements.
agreement between the manufacturer and the purchaser.This is
1.9 This specification is applicable for orders in either
an important consideration in achieving the desired corrosion
inch-pound units (as Specification A995) or in SI units (as
resistance or controlled magnetic permeability, or both, be-
Specification A995M).
cause these properties are not provided by all stainless steels.
1.10 The text of this specification references notes and
1.3 Corrosion Resistance requirements are contained in
footnotes which provide explanatory material. These notes and
Section 11 and Annex A1 and the test procedures options are
footnotes (excluding those in tables and figures) shall not be
Annex A2 (Rapid Macrocell Test) or Annex A3 (Cracked
considered as requirements of the specification.
Beam Test).
1.4 The requirements for introduction of new alloys into a 1.11 Thevaluesstatedineitherinch-poundorSIunitsareto
mandatory chemical composition requirements table in this be regarded separately as standard.Within the text, the SI units
specification are given in Annex A5. are shown in brackets. The values stated in each system may
not be exact equivalents; therefore, each system shall be used
1.5 Requirements for the relative deformation area of three-
independently of the other. Combining values from the two
sided deformed bars are contained in Annex A4.
systems may result in nonconformance with the specification.
1.12 This specification does not purport to address all of the
1
safety concerns, if any, associated with its use. It is the
This specification is under the jurisdiction ofASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
responsibility of the user of this specification to establish
A01.05 on Steel Reinforcement.
appropriate safety, health, and environmental practices and
Current edition approved Ma
...
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 − 20b A955/A955M − 20c
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, restrictive mechanical properties, or controlled magnetic permeability. This
specification has a minimum actual tensile strength to actual yield strength ratio (Table 3). The standard sizes and dimensions of
deformed bars and their numerical designation shall be those listed in Table 1.
1.1.1 A supplementary requirement (S1) is provided for use where a controlled magnetic permeability product is required by
the purchaser. Supplementary Requirement S1 applies only when specified in the purchase order.
1.1.2 A supplementary controlled mechanical properties requirement (S2) is provided for use where a restricted yield strength
range and a higher actual tensile to actual yield strength ratio is required by the purchaser. Supplementary Requirement S2 applies
only when specified in the purchase order.
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.
1.3 Corrosion Resistance requirements are contained in Section 11 and Annex A1 and the test procedures options are Annex
A2 (Rapid Macrocell Test) or Annex A3 (Cracked Beam Test).
1.4 The requirements for introduction of new alloys into a mandatory chemical composition requirements table in this
specification are given in Annex A5.
1.5 Requirements for the relative deformation area of three-sided deformed bars are contained in Annex A4.
1.6 Bars are of three minimum yield strength levels, namely, 60 000 psi [420 MPa], 75 000 psi [520 MPa], and 80 000 psi [550
MPa], designated as Grade 60 [420], Grade 75 [520], or Grade 80 [550], respectively.
1.7 Plain bars in sizes up to and including 2 in. [50.8 mm] in diameter in coils or cut lengths are furnished in accordance with
this specification in Grade 60 [420], Grade 75 [520], and Grade 80 [550], respectively. Mechanical testing, when required, shall
be to the nearest nominal deformed bar size. Requirements providing for deformations and marking shall not be applicable to plain
bars.
1.8 When stainless steel is to be welded, use a procedure suitable for the chemical composition and intended use or service.
NOTE 1—Welding of stainless steel reinforcement would occur after shipment from the manufacturer. 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 manufacturer. AWS D1.6/D1.6M describes the proper selection of the filler metals, temperature control, as well as, performance, procedure
qualification and inspection requirements.
1.9 This specification is applicable for orders in either inch-pound units (as Specification A955) or in SI units (as Specification
A955M).
1.10 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.
1.11 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 nonconformance with the specification.
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 April 1, 2020May 1, 2020. Published May 2020. Originally approved in 1996. Last previous
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