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ASTM A970/A970M

Standard Specification for Welded or Forged Headed Bars for Concrete Reinforcement

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Organization: ASTM
Publication Date: 10 March 1998
Status: inactive
Page Count: 7
ICS Code (Steels for reinforcement of concrete): 77.140.15
scope:

1. Scope

1.1 This specification covers deformed low-alloy steel rein-forcing bars in cut lengths, with head(s) welded or forged to one or both ends, for concrete reinforcement. Heads shall be forge formed or cut from plate.

NOTE 1--This specification is applicable for headed bars produced with welded or forged heads only. The requirements of this specification are not applicable to headed bars where the attachment of the head is accomplished by alternate means, such as by tapered or straight threads.

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 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 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.

1.4.4 Reinforcing bar material conforming to A 615/A 615M or A 706/A 706M is acceptable for the production of forged headed bars.

1.4.5 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 1.4.3 or 1.4.4, 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 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.

1.4.6 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.

Document History

September 1, 2018
Standard Specification for Headed Steel Bars for Concrete Reinforcement
This specification covers deformed steel reinforcing bars in cut lengths, with a head attached to one or both ends, for concrete reinforcement. Heads are forge-formed, machined from bar stock, or cut...
November 15, 2017
Standard Specification for Headed Steel Bars for Concrete Reinforcement
This specification covers deformed steel reinforcing bars in cut lengths, with a head attached to one or both ends, for concrete reinforcement. Heads are forge-formed, machined from bar stock, or cut...
March 1, 2016
Standard Specification for Headed Steel Bars for Concrete Reinforcement
This specification covers deformed steel reinforcing bars in cut lengths, with a head attached to one or both ends, for concrete reinforcement. Heads are forge-formed, machined from bar stock, or cut...
March 1, 2015
Standard Specification for Headed Steel Bars for Concrete Reinforcement
This specification covers deformed steel reinforcing bars in cut lengths, with a head attached to one or both ends, for concrete reinforcement. Heads are forge-formed, machined from bar stock, or cut...
March 1, 2015
Standard Specification for Headed Steel Bars for Concrete Reinforcement
This specification covers deformed steel reinforcing bars in cut lengths, with a head attached to one or both ends, for concrete reinforcement. Heads are forge-formed, machined from bar stock, or cut...
July 1, 2013
Standard Specification for Headed Steel Bars for Concrete Reinforcement
This specification covers deformed steel reinforcing bars in cut lengths, with a head attached to one or both ends, for concrete reinforcement. Heads are forge-formed, machined from bar stock, or cut...
April 1, 2013
Standard Specification for Headed Steel Bars for Concrete Reinforcement
This specification covers deformed steel reinforcing bars in cut lengths, with a head attached to one or both ends, for concrete reinforcement. Heads are forge-formed, machined from bar stock, or cut...
February 15, 2012
Standard Specification for Headed Steel Bars for Concrete Reinforcement
This specification covers deformed steel reinforcing bars in cut lengths, with a head attached to one or both ends, for concrete reinforcement. Heads are forge-formed, machined from bar stock, or cut...
November 15, 2009
Standard Specification for Headed Steel Bars for Concrete Reinforcement
This specification covers deformed and plain steel reinforcing bars in cut lengths, with a head attached to one or both ends, for concrete reinforcement. Attachment can be accomplished through...
October 15, 2007
Standard Specification for Headed Steel Bars for Concrete Reinforcement
This specification covers deformed and plain steel reinforcing bars in cut lengths, with a head attached to one or both ends, for concrete reinforcement. Attachment can be accomplished through...
March 1, 2006
Standard Specification for Headed Steal Bars for Concrete Reinforcement
This specification covers deformed and plain steel reinforcing bars in cut lengths, with a head(s) attached to one or both ends, for concrete reinforcement. Attachment can be accomplished through...
February 1, 2004
Standard Specification for Headed Steal Bars for Concrete Reinforcement
(Footnote *) This specification covers deformed and plain low-alloy steel reinforcing bars in cut lengths, with head(s) attached to one or both ends, for concrete reinforcement. Attachment shall be...
February 1, 2004
Standard Specification for Headed Steel Bars for Concrete Reinforcement
(Footnote *) This specification covers deformed and plain steel reinforcing bars in cut lengths, with a head(s) attached to one or both ends, for concrete reinforcement. Attachment can be...
January 1, 2004
Standard Specification for Headed Steel Bars for Concrete Reinforcement
(Footnote *) 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...
ASTM A970/A970M
March 10, 1998
Standard Specification for Welded or Forged Headed Bars for Concrete Reinforcement
1. Scope 1.1 This specification covers deformed low-alloy steel rein-forcing bars in cut lengths, with head(s) welded or forged to one or both ends, for concrete reinforcement. Heads shall be forge...
March 10, 1997
Standard Specification for Welded Headed Bars for Concrete Reinforcement
A description is not available for this item.

References

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