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ASTM A970/A970M-04a

(Specification)

Standard Specification for Headed Steel Bars for Concrete Reinforcement

Standard Specification for Headed Steel Bars for Concrete Reinforcement

SCOPE
1.1 This specification covers deformed and plain steel reinforcing bars in cut lengths, witha head(s) attached to one or both ends, for concrete reinforcement. Attachment can be accomplished through welding or forging of heads onto the bar ends, by internal threads in the head mating to threads on the bar end or by a separate threaded nut to secure the head to the bar. Heads are forge formed, machined from bar stock, or cut from plate.
Note 1—This specification is applicable for headed bars produced with welded, threaded, or forged heads and used for reinforcement of concrete structures. The requirements of this specification are not applicable to headed bars where the attachment of the head is accomplished by alternate means.
1.2 Grade—Headed bars are of a single minimum yield strength level of 420 MPa [60 000 psi], designated as Grade 420 [60].
1.3 Controlled Mechanical Properties and Performance Requirements—This specification by use of tensile and bend tests and the specified minimum performance levels in Sections 7 and 8 provides the required performance properties for these assemblies.
1.4 Welding, Threading, and Forging
1.4.1 Welding of heads to the reinforcing steel shall be approached with care. A welding procedure conforming to ANSI/AWS D1.4 shall be used for all required production welding of the head to the bar, except for friction welding that shall conform to ANSI/AWS C6.1.
1.4.2 Forging—Integrally forged headed bars where the heads are produced by deforming the bar ends in a hot forging process also are acceptable.
1.4.3 Threading—It shall be permissable to attach the head(s) to the reinforcing bar using straight or tapered internal threads within the head or by securing the head to the threaded bar end with a separate internally threaded nut.
1.4.4 Low-Alloy Steel Bars—Low-alloy steel reinforcing bars conforming to Specification A 706/A 706M shall be used to manufacture welded headed bars. Specification A 706/A 706M limits chemical composition and carbon equivalence to enhance weldablity of the material.
1.4.5 Reinforcing bar material conforming to A 615/A 615M or A 706/A 706M is acceptable for the production of threaded or forged headed bars.
1.4.6 Other types of steel reinforcing bars shall be permitted: (1) providing they conform to the dimensional and weight requirements of the reinforcement as specified in 1.4.4 or 1.4.5, as applicable, and (2) when specified and agreed upon by the purchaser and the manufacturer and only when the suitability of the head and bar materials for the welding, threading, or forging process specified is demonstrated through successful application of the requirements for testing and frequency of testing in Sections 7 and 8 of this specification.
1.4.7 All reinforcing bars shall conform to the mechanical performance requirements of this specification.
1.5 This specification is applicable for orders in either SI or inch-pound units.
1.6 The values stated in either inch-pound units or SI units are to be regarded separately as the 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 specification. The inch-pound units shall apply unless the "M" designation of this specification is specified in the order.
1.7 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.

General Information

Status
Historical
Publication Date
31-Jan-2004
Technical Committee
A01 - Steel, Stainless Steel and Related Alloys
Drafting Committee
A01.05 - Steel Reinforcement
Current Stage
Ref Project

Relations

Replaces
ASTM A970/A970M-04 - Standard Specification for Headed Steel Bars for Concrete Reinforcement
Effective Date
01-Feb-2004
Replaced By
ASTM A970/A970M-04ae1 - Standard Specification for Headed Steel Bars for Concrete Reinforcement
Effective Date
01-Feb-2004

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ASTM A970/A970M-04a - Standard Specification for Headed Steel Bars for Concrete ReinforcementASTM A970/A970M-04a - Standard Specification for Headed Steel Bars for Concrete Reinforcement
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ASTM A970/A970M-04a - Standard Specification for Headed Steel Bars for Concrete Reinforcement
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: A 970/A 970M – 04a
Standard Specification for
1
Headed Bars for Concrete Reinforcement
This standard is issued under the fixed designation A 970/A 970M; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope* A 706M limits chemical composition and carbon equivalence
to enhance weldablity of the material.
1.1 This specification covers deformed and plain low-alloy
1.4.5 Reinforcing bar material conforming to A 615/A
steel reinforcing bars in cut lengths, with head(s) attached to
615M or A 706/A 706M is acceptable for the production of
one or both ends, for concrete reinforcement. Attachment shall
threaded or forged headed bars.
be accomplished through welding or forging of heads onto the
1.4.6 Other types of steel reinforcing bars shall be permit-
bar ends, by internal threads in the head mating to threads on
ted: (1) providing they conform to the dimensional and weight
the bar end or by a separate threaded nut to secure the head to
requirements of the reinforcement as specified in 1.4.4 or 1.4.5,
the bar. Heads shall be forge formed, machined from bar stock,
as applicable, and (2) when specified and agreed upon by the
or cut from plate.
purchaser and the manufacturer and only when the suitability
NOTE 1—This specification is applicable for headed bars produced with
of the head and bar materials for the welding, threading, or
welded, threaded, or forged heads and used for reinforcement of concrete
forging process specified is demonstrated through successful
structures. The requirements of this specification are not applicable to
application of the requirements for testing and frequency of
headed bars where the attachment of the head is accomplished by alternate
testing in Sections 7 and 8 of this specification.
means.
1.4.7 All reinforcing bars shall conform to the mechanical
1.2 Grade—Headed bars are of a single minimum yield
performance requirements of this specification.
strength level of 420 MPa [60 000 psi], designated as Grade
1.5 This specification is applicable for orders in either SI or
420 [60].
inch-pound units.
1.3 Controlled Mechanical Properties and Performance
1.6 The values stated in either inch-pound units or SI units
Requirements—This specification by use of tensile and bend
are to be regarded separately as the standard. Within the text,
tests and the specified minimum performance levels in Sections
the SI units are shown in brackets. The values stated in each
7 and 8 provides the required performance properties for these
system are not exact equivalents; therefore, each system shall
assemblies.
be used independently of the other. Combining values from the
1.4 Welding, Threading, and Forging:
two systems may result in nonconformance with the specifi-
1.4.1 Welding of heads to the reinforcing steel shall be
cation. The inch-pound units shall apply unless the “M”
approached with care. A welding procedure conforming to
designation of this specification is specified in the order.
ANSI/AWS D1.4 shall be used for all required production
1.7 This standard does not purport to address all of the
welding of the head to the bar, except for friction welding that
safety concerns, if any, associated with its use. It is the
shall conform to ANSI/AWS C6.1.
responsibility of the user of this standard to establish appro-
1.4.2 Forging—Integrally forged headed bars where the
priate safety and health practices and determine the applica-
heads are produced by deforming the bar ends in a hot forging
bility of regulatory limitations prior to use.
process also are acceptable.
1.4.3 Threading—It shall be permissable to attach the
2. Referenced Documents
head(s) to the reinforcing bar utilizing straight or tapered
2
2.1 ASTM Standards:
internal threads within the head or by securing the head to the
A 29/A 29M Specification for Steel Bars, Carbon and Alloy,
threaded bar end with a separate internally threaded nut.
Hot-Wrought and Cold-Finished, General Requirements
1.4.4 Low-Alloy Steel Bars—Low-alloy steel reinforcing
for
bars conforming to Specification A 706/A 706M shall be used
A 36/A 36M Specification for Carbon Structural Steel
to manufacture welded headed bars. Specification A 706/
A 108 Specification for Steel Bars, Carbon, Cold Finished,
Standard Quality
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
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
A01.05 on Steel Reinforcement.
contact ASTM customer service at service@astm.org. For Annual Book of ASTM
Current editio
...

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