ASTM A996/A996M-00
(Specification)Standard Specification for Rail-Steel and Axle-Steel Deformed Bars for Concrete Reinforcement
Standard Specification for Rail-Steel and Axle-Steel Deformed Bars for Concrete Reinforcement
SCOPE
1.1 This specification covers rail-steel and axle-steel bars for concrete reinforcement. Three types of product are included, designated with a "rail symbol," and an "R" for bars made of rail-steel and with an "A" for bars made of axle-steel. The standard sizes and dimensions of deformed bars and their number designations are given in . All sizes and grades of all types may not be readily available; manufacturers should be consulted to verify availability.
1.2 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 the specification.
1.3 Type "rail symbol" and Type R are of two minimum yield levels, namely 50 000 psi [350 MPa] and 60 000 psi [420 MPa] designated as Grade 50 [350] and Grade 60 [420], respectively. Type A is of two minimum yield levels, namely 40 000 psi [300 MPa] and 60 000 psi [420 MPa] designated Grade 40 [300] and Grade 60 [420].
1.4 The weldability of the steel is not a requirement of this specification.
1.5 This specification is applicable for orders in either inch-pound units (Specification A996) or SI units (Specification A996M).
1.6 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 must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
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.
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Designation: A 996/A 996M – 00
Standard Specification for Rail-Steel and Axle-Steel
Deformed Bars for Concrete Reinforcement
This standard is issued under the fixed designation A 996/A 996M; 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 700 Practices for Packaging, Marking, and Loading
Methods for Steel Products for Domestic Shipment
1.1 This specification covers rail-steel and axle-steel bars
E 29 Practice for Using Significant Digits in Test Data to
for concrete reinforcement. Three types of product are in-
Determine Conformance with Specifications
cluded, designated with a “rail symbol,” and an “R” for bars
2.2 Military Standards:
made of rail-steel and with an “A” for bars made of axle-steel.
MIL-STD-129 Marking for Shipment and Storage
The standard sizes and dimensions of deformed bars and their
MIL-STD-163 Steel Mill Products Preparation for Ship-
number designations are given in Table 1. All sizes and grades
ment and Storage
of all types may not be readily available; manufacturers should
2.3 Federal Standard:
be consulted to verify availability.
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
1.2 The text of this specification references notes and
footnotes that provide explanatory material. These notes and
3. Terminology
footnotes, excluding those in tables and figures, shall not be
3.1 Definitions of Terms Specific to This Standard:
considered as requirements of the specification.
3.1.1 deformed bar, n—steel bar with protrusions; a bar that
1.3 Type “rail symbol” and Type R are of two minimum
is intended for use as reinforcement in reinforced concrete
yield levels, namely 50 000 psi [350 MPa] and 60 000 psi [420
construction.
MPa] designated as Grade 50 [350] and Grade 60 [420],
3.1.1.1 Discussion—The surface of the bar is provided with
respectively. Type A is of two minimum yield levels, namely
lugs or protrusions that inhibit longitudinal movement of the
40 000 psi [300 MPa] and 60 000 psi [420 MPa] designated
bar relative to the concrete surrounding the bar in such
Grade 40 [300] and Grade 60 [420].
construction. The lugs or protrusions conform to the provisions
1.4 The weldability of the steel is not a requirement of this
of this specification.
specification.
3.1.2 deformations, n—protrusions on a deformed bar.
1.5 This specification is applicable for orders in either
3.1.3 rib, n—longitudinal protrusion on a deformed bar.
inch-pound units (Specification A 996) or SI units (Specifica-
tion A 996M).
4. Ordering Information
1.6 The values stated in either inch-pound units or SI units
4.1 It shall be the responsibility of the purchaser to specify
are to be regarded as standard. Within the text, the SI units are
all requirements that are necessary for material ordered to this
shown in brackets. The values stated must be used indepen-
specification. Such requirements shall include, but are not
dently of the other. Combining values from the two systems
limited to, the following.
may result in nonconformance with the specification.
4.1.1 Quantity (weight) [mass],
1.7 This standard does not purport to address all of the
4.1.2 Name of material (rail-steel or axle-steel deformed
safety concerns, if any, associated with its use. It is the
bars for concrete reinforcement),
responsibility of the user of this standard to establish appro-
4.1.3 Type,
priate safety and health practices and determine the applica-
4.1.4 Size,
bility of regulatory limitations prior to use.
4.1.5 Grade,
2. Referenced Documents 4.1.6 Packaging (see Section 20),
4.1.7 ASTM designation and year of issue, and
2.1 ASTM Standards:
4.1.8 Certified mill test reports (if desired).
A 370 Test Methods and Definitions for Mechanical Testing
of Steel Products
NOTE 1—A typical ordering description is as follows: 20 tons rail-steel
deformed bars for concrete reinforcement, Type R, No. 6, 30 ft 0 in. long,
Grade 60, in secured lifts, to ASTM A 996–________. Certified mill test
This specification is under the jurisdiction of ASTM Committee A-1 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.05 on Steel Reinforcement. Annual Book of ASTM Standards, Vol 01.05.
Current edition approved January 10, 2000. Published April 2000. Originally Annual Book of ASTM Standards, Vol 14.02.
published as A 996/A 996M-98. Last previous edition A 996/A 996M-98 Available from Standardization Documents Order Desk, Bldg. 4, Section D,
Annual Book of ASTM Standards, Vol 01.01. 700 Robbins Ave., Philadelphia, PA 19111–5094.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
A 996/A 996M
TABLE 1 Deformed Bar Designation Numbers, Nominal Weights [Masses], Nominal Dimensions, and Deformation Requirements
B
Nominal Dimensions Deformation Requirements, in. [mm]
Nominal Weight,
Bar Designation
Maximum Gap
lb/ft [Nominal Mass,
A
Cross-Sectional Maximum Average Minimum Average
No.
Diameter, in. [mm] Perimeter, in. [mm] (Chord of 12.5 % of
kg/m] 2 2
Area in. [mm ] Spacing Height
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]
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 millimeters 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 [meter] as the deformed bar.
reports required. [19 Mg, rail-steel deformed bars for concrete reinforce-
7.5 The spacing, height, and gap of deformations shall
ment, Type R, No. 19, 18.3-m long, Grade 420, in secured lifts, to ASTM
conform to the requirements prescribed in Table 1.
A 996M–________. Certified mill test reports required.]
8. Measurements of Deformation
5. Materials and Manufacture
8.1 The average spacing of deformations shall be deter-
5.1 The bars shall be rolled from standard section Tee rails mined by dividing a measured length of the bar specimen by
or from carbon steel axles for railway cars and locomotives. No
the number of individual deformations and fractional parts of
other materials, such as those known by the terms “rerolled, deformations on any one side of the bar specimen. A measured
rail-steel equivalent, and rail-steel quality” shall be substituted.
length of the bar specimen shall be considered the distance
from a point on a deformation to a corresponding point on any
6. Carbon Determination
other deformation on the same side of the bar. Spacing
6.1 For axle-steel product, the manufacturer shall make a
measurements shall not be made over a bar area containing bar
determination for the carbon content of each axle received for
marking symbols involving letters or numbers.
manufacture into reinforcing bars. Based on these carbon
8.2 The average height of deformations shall be determined
determinations, all steel axles shall be stocked for subsequent from measurements made on not less than two typical defor-
rolling in separated lots by carbon range. The ranges of carbon
mations. Determinations shall be based on three measurements
shall be determined by the manufacturer as those best suited to per deformation, one at the center on the overall length and the
meet the mechanical requirements.
other two at the quarter points of the overall length.
6.2 When requested by the purchaser, the manufacturer 8.3 Insufficient height, insufficient circumferential cover-
shall report the carbon range for each lot of bars furnished.
age, or excessive spacing of deformations shall not constitute
cause for rejection unless it has been clearly established by
7. Requirements for Deformations
determinations on each lot (Note 2) tested that typical defor-
7.1 Deformations shall be spaced along the bar at substan-
mation height, gap, or spacing does not conform to the
tially uniform distances. The deformations on opposite sides of
minimum requirements prescribed in Section 7. No rejection
the bar shall be similar in size, shape, and pattern.
shall be made on the basis of measurements if fewer than ten
7.2 The deformations shall be placed with respect to the axis
adjacent deformations on each side of the bar are measured.
of the bar so that the included angle is not less than 45°. Where
NOTE 2—As used within the intent of 8.3 and 14.1, the term “lot” shall
the line of deformations forms an included angle with the axis
mean all the bars of one bar number and pattern of deformations contained
of the bar from 45° to 70° inclusive, the deformations shall
in an individual shipping release or shipping order.
reverse alternately in direction from those on the opposite side.
9. Tensile Requirements
Where the line of deformations is over 70°, reversal in
direction shall not be required. 9.1 The material, as represented by the test specimens, shall
7.3 The average spacing or distance between deformations conform to the requirements for tensile properties prescribed in
on each side of the bar shall not exceed seven tenths of the Table 2.
nominal diameter of the bar. 9.2 The yield point or yield strength shall be determined by
7.4 The overall length of the deformations shall be such that one of the following methods.
the gap between the ends of the deformations on opposite sides 9.2.1 The yield point shall be determined by the drop of the
of the bar shall not exceed 12.5 % of the nominal perimeter of beam or halt in the gage of the testing machine.
the bar. Where the ends terminate in a longitudinal rib, the 9.2.2 Where the steel tested does not have a well-defined
width of the longitudinal rib shall be considered the gap. Where yield point, the yield strength shall be determined at extension
more than two longitudinal ribs are involved, the total width of under load using an aut
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