ASTM A416/A416M-05

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Designation: A 416/A416M – 05
Standard Specification for
Steel Strand, Uncoated Seven-Wire for Prestressed
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Concrete
This standard is issued under the fixed designationA416/A416M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
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1. Scope* MIL-STD-129 Marking for Shipment and Storage
MIL-STD-163 Steel Mill Products Preparation for Ship-
1.1 This specification covers two types and two grades of
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ment and Storage
seven-wire, uncoated steel strand for use in pretensioned and
2.3 U.S. Federal Standard:
post-tensioned prestressed concrete construction. The two
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Fed.Std.No.123 MarkingforShipments(CivilAgencies)
types of strand are low-relaxation and stress-relieved (normal-
relaxation). Low-relaxation strand shall be regarded as the
3. Terminology
standard type. Stress-relieved (normal-relaxation) strand will
3.1 Definitions of Terms Specific to This Standard:
notbefurnishedunlessspecificallyordered,orbyarrangement
3.1.1 strand, n—a group of wires having a center wire
between purchaser and supplier. Grade 1725 [250] and Grade
enclosed tightly by six helically placed outer wires with
1860 [270] have minimum ultimate strengths of 1725 MPa
uniform pitch of not less than 12 and not more than 16 times
[250 ksi] and 1860 MPa [270 ksi], respectively, based on the
the nominal diameter of the strand.
nominal area of the strand.
3.2 Discussion—The direction of lay may be either right-
1.2 The values stated in either inch-pound units or SI units
or left-hand, however, strands of different lays should not be
are to be regarded as standard. Within the text, the inch-pound
spliced together.
units are shown in brackets. The values stated in each system
are not exact equivalents; therefore, each system must be used
4. Ordering Information
independently of the other. Combining values from the two
4.1 Orders for seven-wire low-relaxation or stress-relieved
systems may result in nonconformance with the specification.
(normal-relaxation) strand under this specification should in-
1.3 ThesupplementaryrequirementsinS1shallbespecified
clude the following information:
for 15.2-mm (0.6-in.) diameter uncoated seven-wire steel
4.1.1 Quantity (meters [feet]),
strandifneededforapplicationsinprestressedgroundanchors.
4.1.2 Diameter of strand,
4.1.3 Grade of strand,
2. Referenced Documents
2 4.1.4 Type of strand,
2.1 ASTM Standards:
4.1.5 Packaging,
A370 TestMethodsandDefinitionsforMechanicalTesting
4.1.6 ASTM designation and year of issue, and
of Steel Products
4.1.7 Special requirements, if any.
A981 Test Method for Evaluating Bond Strength for 15.2
mm (0.6 in.) Diameter Prestressing Steel Strand, Grade
NOTE 1—Atypicalorderingdescriptionisasfollows:25600m[84000
270, Uncoated, Used in Prestressed Ground Anchors ft], 13 mm [0.5 in.], Grade 1860 [270] low-relaxation strand, in 3600-m
[12000-ft] reelless packs to ASTM A416/A416M–_________.
E328 Test Methods for Stress-Relaxation Tests for Materi-
als and Structures
5. Materials and Manufacture
2.2 U.S. Military Standards:
5.1 Base Metal—The base metal shall be carbon steel of
such quality that when drawn to wire, fabricated into strand,
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This specification is under the jurisdiction ofASTM CommitteeA01 on Steel, and then thermally treated, shall have the properties and
Stainless Steel, and RelatedAlloys and is the direct responsibility of Subcommittee
characteristics prescribed in this specification.
A01.05 on Steel Reinforcement.
5.2 Wire—The wire from which the strand is to be fabri-
CurrenteditionapprovedJune1,2005.PublishedJuly2005.Originallyapproved
cated shall be round and have a dry-drawn finish.
in 1957. Last previous edition approved in 2002 as A416–02.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on
Available from Standardization Documents Order Desk, Bldg. 4, Section D,
the ASTM website.
700 Robbins Ave., Philadelphia, PA 19111-5094.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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A 416/A416M – 05
NOTE 2—Thisproductisacompositeofsevenwiresandisproducedto
breaking strength of the strand after 1000 h tested under the
mechanical properties only. The chemistry of all wires or any individual
conditions listed in 6.5.1 through 6.5.7.
wireisn
...