ASTM A706/A706M-00
(Specification)Standard Specification for Low-Alloy Steel Deformed and Plain Bars for Concrete Reinforcement
Standard Specification for Low-Alloy Steel Deformed and Plain Bars for Concrete Reinforcement
SCOPE
1.1 General--This specification covers deformed and plain low-alloy steel bars in cut lengths or coils for concrete reinforcement intended for applications where restrictive mechanical properties and chemical composition are required for compatibility with controlled tensile property applications or to enhance weldability. The standard sizes and dimensions of deformed bars and their number designations are given in Table 1 . The text of this specification references notes and footnotes that provide explanatory material. These notes and footnotes, excluding those in tables and figures, shall not be considered as requirements of this specification.
1.2 Grade--Bars are of a single minimum yield strength level: namely, 60 000 psi [420 MPa], designated as Grade 60 [420].
1.3 Plain rounds, in sizes up to and including 2 in. [50.8 mm] in diameter in coils or cut lengths, when ordered, shall be furnished under this specification. For ductility properties (elongation and bending), test provisions of the nearest smaller nominal diameter deformed bar size shall apply.
1.4 Controlled Tensile Properties--This specification limits mechanical properties (Table 2) to provide the desired yield/tensile properties for controlled tensile property applications.
1.5 Welding--This specification limits chemical composition (6.2) and carbon equivalent (6.4) to enhance the weldability of the material. When steel is to be welded, a welding procedure suitable for the chemical composition and intended use or service should be used. The use of the latest edition of ANSI/AWS D1.4 is recommended. This document describes the proper selection of the filler metals, preheat/interpass temperatures, as well as, performance and procedure qualification requirements.
1.6 This specification is applicable for orders in either inch-pound units (Specification A706) or in SI units [Specification A706M].
1.7 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 this specification.
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Designation: A 706/A 706M – 00
Standard Specification for
Low-Alloy Steel Deformed and Plain Bars for Concrete
Reinforcement
This standard is issued under the fixed designation A 706/A 706M; 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.
1. Scope shown in brackets. The values stated in each system are not
exact equivalents; therefore, each system must be used inde-
1.1 General—This specification covers deformed and plain
pendently of the other. Combining values from the two systems
low-alloy steel bars in cut lengths or coils for concrete
may result in nonconformance with this specification.
reinforcement intended for applications where restrictive me-
chanical properties and chemical composition are required for
2. Referenced Documents
compatibility with controlled tensile property applications or to
2.1 ASTM Standards:
enhance weldability. The standard sizes and dimensions of
A 6/A 6M Specification for General Requirements for
deformed bars and their number designations are given in
Rolled Structural Steel Bars, Plates, Shapes, and Steel
Table 1. The text of this specification references notes and
Piling
footnotes that provide explanatory material. These notes and
A 370 Test Methods and Definitions for Mechanical Testing
footnotes, excluding those in tables and figures, shall not be
of Steel Products
considered as requirements of this specification.
A 510 Specification for General Requirements for Wire
1.2 Grade—Bars are of a single minimum yield strength
Rods and Coarse Round Wire, Carbon Steel
level: namely, 60 000 psi [420 MPa], designated as Grade 60
A 510M Specification for General Requirements for Wire
[420].
Rods and Coarse Round Wire, Carbon Steel (Metric)
1.3 Plain rounds, in sizes up to and including 2 in. [50.8
A 615/A 615M Specification for Deformed and Plain Billet-
mm] in diameter in coils or cut lengths, when ordered, shall be
Steel Bars for Concrete Reinforcement
furnished under this specification. For ductility properties
A 700 Practices for Packaging, Marking, and Loading
(elongation and bending), test provisions of the nearest smaller
Methods for Steel Products for Domestic Shipment
nominal diameter deformed bar size shall apply.
A 751 Test Methods, Practices, and Terminology for
1.4 Controlled Tensile Properties—This specification limits
Chemical Analysis of Steel Products
mechanical properties (Table 2) to provide the desired yield/
E 29 Practice for Using Significant Digits in Test Data to
tensile properties for controlled tensile property applications.
Determine Conformance with Specifications
1.5 Welding—This specification limits chemical composi-
2.2 ANSI/AWS Standard:
tion (6.2) and carbon equivalent (6.4) to enhance the weldabil-
AWS D1.4 Structural Welding Code—Reinforcing Steel
ity of the material. When steel is to be welded, a welding
2.3 Government Standards:
procedure suitable for the chemical composition and intended
MIL-STD-129 Marking for Shipment and Storage
use or service should be used. The use of the latest edition of
MIL-STD-163 Steel Mill Products Preparation for Ship-
ANSI/AWS D1.4 is recommended. This document describes
ment and Storage
the proper selection of the filler metals, preheat/interpass
2.4 U.S. Federal Standard:
temperatures, as well as, performance and procedure qualifi-
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
cation requirements.
1.6 This specification is applicable for orders in either
3. Terminology
inch-pound units (Specification A 706) or in SI units [Specifi-
3.1 Definitions of Terms Specific to This Standard:
cation A 706M].
1.7 The values stated in either inch-pound units or SI units
are to be regarded as standard. Within the text, the SI units are
Annual Book of ASTM Standards, Vol 01.04.
Annual Book of ASTM Standards, Vol 01.03.
Annual Book of ASTM Standards, Vol 01.05.
1 5
This specification is under the jurisdiction of ASTM Committee A-1 on Steel, Annual Book of ASTM Standards, Vol 14.02.
Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee Available from the American Welding Society, P.O. Box 351040, 550 N.W. Le
A01.05 on Steel Reinforcement. Jeune Rd., Miami, FL 33135.
Current edition approved March 10, 2000. Published April 2000. Originally Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700
e2
published as A 706 – 74. Last previous edition A 706/A 706M – 98 . Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
A 706/A 706M
TABLE 1 Deformed Bar Designation Numbers, Nominal Weights [Masses], Nominal Dimensions, and Deformation Requirements
B
Nominal Dimensions Deformation Requirements, in. [mm]
Bar
Nominal Weight, lb/ft
Desig-
Maximum Gap
[Nominal Mass,
Diameter, Cross-Sectional Area Perimeter, Maximum Average Minimum Average
nation
(Chord of 12.5 % of
kg/m] 2 2
A
in. [mm] in. [mm ] in. [mm] Spacing Height
No.
Nominal Perimeter)
3 [10] 0.376 [ 0.560] 0.375 [ 9.5] 0.11 [ 71] 1.178 [ 29.9] 0.262 [ 6.7] 0.015 [0.38] 0.143 [ 3.6]
4 [13] 0.668 [ 0.994] 0.500 [12.7] 0.20 [ 129] 1.571 [ 39.9] 0.350 [ 8.9] 0.020 [0.51] 0.191 [ 4.9]
5 [16] 1.043 [ 1.552] 0.625 [15.9] 0.31 [ 199] 1.963 [ 49.9] 0.437 [11.1] 0.028 [0.71] 0.239 [ 6.1]
6 [19] 1.502 [ 2.235] 0.750 [19.1] 0.44 [ 284] 2.356 [ 59.8] 0.525 [13.3] 0.038 [0.97] 0.286 [ 7.3]
7 [22] 2.044 [ 3.042] 0.875 [22.2] 0.60 [ 387] 2.749 [ 69.8] 0.612 [15.5] 0.044 [1.12] 0.334 [ 8.5]
8 [25] 2.670 [ 3.973] 1.000 [25.4] 0.79 [ 510] 3.142 [ 79.8] 0.700 [17.8] 0.050 [1.27] 0.383 [ 9.7]
9 [29] 3.400 [ 5.060] 1.128 [28.7] 1.00 [ 645] 3.544 [ 90.0] 0.790 [20.1] 0.056 [1.42] 0.431 [10.9]
10 [32] 4.303 [ 6.404] 1.270 [32.3] 1.27 [ 819] 3.990 [101.3] 0.889 [22.6] 0.064 [1.63] 0.487 [12.4]
11 [36] 5.313 [ 7.907] 1.410 [35.8] 1.56 [1006] 4.430 [112.5] 0.987 [25.1] 0.071 [1.80] 0.540 [13.7]
14 [43] 7.65 [11.38] 1.693 [43.0] 2.25 [1452] 5.32 [135.1] 1.185 [30.1] 0.085 [2.16] 0.648 [16.5]
18 [57] 13.60 [20.24] 2.257 [57.3] 4.00 [2581] 7.09 [180.1] 1.58 [40.1] 0.102 [2.59] 0.864 [21.9]
A
Bar numbers are based on the number of eighths of an inch included in the nominal diameter of the bars [bar numbers approximate the number of millimetres of the
nominal diameter of the bar].
B
The nominal dimensions of a deformed bar are equivalent to those of a plain round bar having the same weight [mass] per foot [metre] as the deformed bar.
TABLE 2 Tensile Requirements Certified mill test reports are required.]
A
Tensile strength, min, psi [MPa] 80 000 [550]
5. Material and Manufacture
Yield strength, min, psi [MPa] 60 000 [420]
Yield strength, max, psi [MPa] 78 000 [540]
5.1 The bars shall be processed from properly identified
Elongation in 8 in. [203.2 mm], min, %
heats of mold cast or strand cast steel.
Bar Designation Nos.
3, 4, 5, 6 [10, 13, 16, 19] 14
5.2 The steel shall be made by one or more of the following
7, 8, 9, 10, 11 [22, 25, 29, 32, 36] 12
processes: open-hearth, basic-oxygen, or electric-furnace.
14, 18 [43, 57] 10
A
Tensile strength shall not be less than 1.25 times the actual yield strength.
6. Chemical Composition
6.1 The chemical analysis of each heat shall be determined
3.1.1 deformations, n—protrusions on a deformed bar.
in accordance with Test Methods A 751. The manufacturer
3.1.2 deformed bar, n—steel bar with protrusions; a bar
shall make the analysis on test samples taken preferably during
that is intended for use as reinforcement in reinforced concrete
the pouring of the heat. The percentages of carbon, manganese,
and related construction.
phosphorus, sulfur, silicon, copper, nickel, chromium, molyb-
3.1.3 Discussion—The surface of the bar is provided with
denum, and vanadium shall be determined.
lugs or protrusions that inhibit longitudinal movement of the
6.2 The chemical composition as shown by heat analysis
bar relative to the concrete surrounding the bar in such
shall be limited by the following:
construction. The lugs or protrusions conform to the provisions
Element max, %
of this specification.
3.1.4 plain bar, n—steel bar without protrusions. Carbon 0.30
Manganese 1.50
3.1.5 rib, n— longitudinal protrusions on a deformed bar.
Phosphorus 0.035
Sulfur 0.045
4. Ordering Information
Silicon 0.50
4.1 It shall be the responsibility of the purchaser to specify
6.3 Choice and use of alloying elements, combined with
all requirements that are necessary for material ordered to this
carbon, phosphorus, and sulfur to give the mechanical proper-
specification. Such requirements shall include, but are not
ties prescribed in Table 2 and Table 3, shall be made by the
limited to, the following:
manufacturer. Elements commonly used include manganese,
4.1.1 Quantity (weight) [mass],
silicon, copper, nickel, chromium, molybdenum, vanadium,
4.1.2 Name of material (low-alloy steel deformed and plain
columbium, titanium, and zirconium.
bars for concrete reinforcement),
6.4 The heat analysis shall be such as to provide a carbon
4.1.3 Size,
equivalent (C.E.) not exceeding 0.55 % as calculated by the
4.1.4 Cut lengths or coils,
following formula:
4.1.5 Deformed or plain,
%Mn %Cu %Ni %Cr %Mo %V
4.1.6 Packaging (see Section 17),
C.E. 5 %C 1 1 1 1 2 2
6 40 20 10 50 10
4.1.7 ASTM designation and year of issue, and
(1)
4.1.8 Certified mill test reports (if desired). (See Section
13.)
TABLE 3 Bend Test Requirements
Bar Designation No. Pin Diameter for 180° Bend Tests
NOTE 1—A typical ordering description is as follows: 20 tons, low-
A
alloy steel deformed bars for concrete reinforcement, No. 14, 60 ft 0 in.
3, 4, 5 [10, 13, 16] 3d
long, in secured lifts to Specification A 706 – ____. Certified mill test 6, 7, 8 [19, 22, 25] 4d
9, 10, 11 [29, 32, 36] 6d
reports are required.
14, 18 [43, 57] 8d
[19 tonnes, low-alloy steel deformed bars for concrete reinforcement,
A
No. 25, 18.3 m long, in secured lifts to Specification A 706M – ____. d 5 nominal diameter of specimen.
A 706/A 706M
6.5 Product (Check) Verification Analysis—An analysis shall be made on the basis of measurements if fewer than ten
may be made by the purchaser from finished bars representing adjacent deformations on each side of the bar are measured.
each heat of steel. The percentages thus determined shall not
NOTE 2—As used within the intent of 8.3, the term “lot” shall mean all
exceed the following:
the bars of one bar size and pattern of deformations contained in an
Element max, %
individual shipping release or shipping order.
Carbon 0.33 %
9. Mechanical Requirements
Manganese 1.56 %
9.1 Tensile Properties:
Phosphorus 0.043 %
Sulfur 0.053 %
9.1.1 The material, as represented by the test specimens,
Silicon 0.55 %
shall conform to the requirements for tensile properties pre-
7. Requirements for Deformations
scribed in Table 2. The yield strength or yield point shall be
determined by one of the following methods:
7.1 Deformations shall be spaced along the bar at substan-
9.1.1.1 Extension under load using an autographic diagram
tially uniform distances. The deformations on opposite sides of
method or an extensometer as described in Test Methods and
the bar shall be similar in size, shape, and pattern.
Definitions A 370. However, the extension under load shall be
7.2 The deformations shall be placed with respect to the axis
0.0035 in./in. [0.0035 mm/mm] (0.35 %). When material is
of the bar so that the included angle is not less than 45°. Where
furnished in coils, the test sample shall be straightened prior to
the line of deformations forms an included angle with the axis
placing it in the jaws of the tensile machine (see Note 5).
of the bar from 45 to 70°, inclusive, the deformations shall
Straightening shall be done carefully to avoid the formation of
reverse alternately in direction on each side, or those on one
local sharp bends and to minimize cold work. Insufficient
side shall be reversed in direction from those on the opposite
straightening prior to attaching the extensometer can result in
side. Where the line of deformation is over 70°, a reversal in
lower-than-actual yield strength readings.
direction shall not be required.
9.1.1.2 By the drop of the beam or halt in the gage of the
7.3 The average spacing or distance between deformations
testing machine, where the steel tested has a sharp-kneed or
on each side of the bar shall not exceed ⁄10 of the nominal
well-defined type of yield point.
diameter of the bar.
9.1.2 The percentage of elongation shall be as prescribed in
7.4 The overall length of deformations shall be such that the
Table 2.
gap between the ends of the deformations on opposite sides of
the bar shall not exceed 12.5 % of the nominal perimeter of the
NOTE 3—Straightening should be done carefully to avoid the formation
bar. Where the ends terminate in a longitudinal rib, the width of
of local sharp bends and to minimize cold work. Insufficient straightening
the longitudinal rib shall be considered the gap. Where more prior to attaching the extensometer can result in lower-than-actual yield
strength readings.
than two longitudinal ribs are involved, the total width of all
longitudinal ribs shall not exceed 25 % of the nominal perim-
9.2 Bending Properties:
eter of the bar. Furthermore, the summation of gaps shall not
9.2.1 The bend test specimen shall withstand being bent
exceed 25 % of the nominal perimeter of the bar. The nominal
around a pin without cracking on the outside radius of the bent
perimeter of the bar shall be 3.14 times the nominal diameter.
portion. The requirements for degree of bending and sizes of
7.5 The spacing, height, and gap of deformations shall
pins are prescribed in Table 3. When material is furnished in
conform to the requirements prescribed in Table 1.
coils, the test sample shall be straightened prior to placing it in
the bend tester.
8. Measurements of Deformations
9.2.2 The bend test shall be made on specimens of sufficient
8.1 The average spacing of deformations shall be deter-
length to ensure free bending and with apparatus that provides:
mined by dividing a measured length of the bar specimen by
9.2.2.1 Continuous and uniform application of force
the number of individual deformations and fractional parts of
throughout the duration of the bending operation,
deformations on any one side of the bar specimens. A measured
9.2.2.2 Unrestricted movement of the specimen at points of
length of the bar specimen shall be considered the distance
contact
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