ASTM A416/A416M-99

Standard Specification for Steel Strand, Uncoated Seven-Wire for Prestressed Concrete

SCOPE
1.1 This specification covers two types and two grades of seven-wire, uncoated steel strand for use in pretensioned and post-tensioned prestressed concrete construction. The two types of strand are low-relaxation and stress-relieved (normal-relaxation). Low-relaxation strand shall be regarded as the standard type. Stress-relieved (normal-relaxation) strand will not be furnished unless specifically ordered, or by arrangement between purchaser and supplier. Grade 250 [1725] and Grade 270 [1860] have minimum ultimate strengths of 250000 psi [1725 MPa] and 270000 psi [1860 MPa], respectively, based on the nominal area of the strand.  
1.2 The values stated in either inch-pound units or SI units are to be regarded 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 must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

General Information

• Status: Historical
• Publication Date: 09-Sep-1999
• ICS: 77.140.15 - Steels for reinforcement of concrete
• Technical Committee: A01 - Steel, Stainless Steel and Related Alloys
• Drafting Committee: A01.05 - Steel Reinforcement

Relations

• Replaced By: ASTM A416/A416M-02 - Standard Specification for Steel Strand, Uncoated Seven-Wire for Prestressed Concrete
• Effective Date: 10-Sep-2002
• Referred By: ASTM C913-21 - Standard Specification for Precast Concrete Water and Wastewater Structures
• Effective Date: 10-Sep-1999
• Referred By: ASTM F432-19 - Standard Specification for Roof and Rock Bolts and Accessories
• Effective Date: 10-Sep-1999
• Referred By: ASTM C1804-20 - Standard Specification for Spun Cast Prestressed Concrete Bases for Tapered Steel Lighting Poles
• Effective Date: 10-Sep-1999
• Referred By: ASTM A882/A882M-20 - Standard Specification for Filled Epoxy-Coated Seven-Wire Steel Prestressing Strand
• Effective Date: 10-Sep-1999
• Referred By: ASTM C825-19 - Standard Specification for Precast Concrete Barriers
• Effective Date: 10-Sep-1999
• Referred By: ASTM C1089-19 - Standard Specification for Spun Cast Prestressed Concrete Poles
• Effective Date: 10-Sep-1999
• Referred By: ASTM A1114/A1114M-20 - Standard Specification for Low-Relaxation, Seven-Wire, Grade 240 [1655], Stainless Steel Strand for Prestressed Concrete
• Effective Date: 10-Sep-1999
• Referred By: ASTM A981/A981M-11(2016) - Standard Test Method for Evaluating Bond Strength for 0.600-in. [15.24-mm] Diameter Steel Prestressing Strand, Grade 270 [1860], Uncoated, Used in Prestressed Ground Anchors
• Effective Date: 10-Sep-1999
• Referred By: ASTM C935-19 - Standard Specification for General Requirements for Prestressed Concrete Poles Statically Cast
• Effective Date: 10-Sep-1999
• Referred By: ASTM A1081/A1081M-21 - Standard Test Method for Evaluating Bond of Seven-Wire Steel Prestressing Strand
• Effective Date: 10-Sep-1999

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: A 416/A416M – 99
Standard Specification for
Steel Strand, Uncoated Seven-Wire for Prestressed
1
Concrete
This standard is issued under the fixed designation A 416/A416M; 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.
This standard has been approved for use by agencies of the Department of Defense.
5
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
5
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
5
Fed. Std. No. 123 Marking for Shipments (Civil Agencies)
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:
not be furnished unless specifically ordered, or by arrangement
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 The supplementary requirements in S1 shall be specified
clude the following information:
for 15.2-mm (0.6-in.) diameter uncoated seven-wire steel
4.1.1 Quantity (meters [feet]),
strand if needed for applications in prestressed ground anchors.
4.1.2 Diameter of strand,
4.1.3 Grade of strand,
2. Referenced Documents
4.1.4 Type of strand,
2.1 ASTM Standards:
4.1.5 Packaging,
A 370 Test Methods and Definitions for Mechanical Testing
2 4.1.6 ASTM designation and year of issue, and
of Steel Products
4.1.7 Special requirements, if any.
A 981 Test Method for Evaluating Bond Strength for 15.2
mm (0.6 in.) Diameter Prestressing Steel Strand, Grade
NOTE 1—A typical ordering description is as follows: 25 600 m [84 000
3
270, Uncoated, Used in Prestressed Ground Anchors ft], 13 mm [0.5 in.], Grade 1860 [270] low-relaxation strand, in 3600-m
[12 000-ft] reelless packs to ASTM A 416/A 416M– _________.
E 328 Methods for Stress-Relaxation Tests for Materials
4
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,
1
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
and then thermally treated, shall have the properties and
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee
characteristics prescribed in this specification.
A01.05 on Steel Reinforcement.
Current edition approved Sept. 10, 1999. Published December 1999. Originally
e1
published as A 416 – 57 T. Last previous edition A 416 – 98 .
2
Annual Book of ASTM Standards, Vol 01.03.
3 5
Annual Book of ASTM Standards, Vol 01.04. Available from Standardization Documents Order Desk, Bldg. 4, Section D,
4
Annual Book of ASTM Standards, Vol 03.01. 700 Robbins Ave., Philadelphia, PA 19111-5094.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
A 416/A416M – 99
5.2 Wire—The wire from which the strand is to be fabri- more than 3.5 % when loaded to 80 % of specified minimum
cated shall be round and have a dry-drawn finish. breaking strength of the strand after 1000 h tested under the
conditions listed in 6.5.1 through 6.5.7.
NOTE 2—This product
...