ASTM A706 - A 706M - 25 混凝土配筋用变形和普通低合金钢筋的标准规范

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Designation: A706/A706M −25
Standard Speciﬁcation for
Deformed and Plain Low-Alloy Steel Bars for Concrete
Reinforcement
1
This standard is issued under the ﬁxed designation A706/A706M; 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 (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope*
1.1 General—This speciﬁcation covers deformed and plain
low-alloy steel bars in cut lengths and coils for concrete
reinforcement intended for applications where restrictive me-
chanical 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.
1.2 Grade—Bars are of three minimum yield strength lev-
els: namely, 60 000 psi [420 MPa], 80 000 psi [550 MPa], and
100 000 psi [690 MPa], designated as Grade 60 [420], Grade
80 [550], and Grade 100 [690], respectively.
1.3 Plain bars, in sizes up to and including 2
1
⁄
2
in. [63.5 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. Requirements
providing for deformations and marking shall not be appli-
cable.
1.4 Controlled Tensile Properties—This speciﬁcation limits
tensile properties (Table 2) to provide the desired yield/tensile
properties for controlled tensile property applications.
1.5 Welding—This speciﬁcation limits chemical composi-
tion (6.2) and carbon equivalent (6.4) to enhance the weldabil-
ity of the material. When this 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
AWS D1.4 ⁄D1.4M is recommended. The AWS D1.4/D1.4M
Welding Code describes the proper selection of the ﬁller
metals, preheat/interpass temperatures, as well as, performance
and procedure qualiﬁcation requirements.
NOTE 1—As a result of the 117 000 psi minimum tensile strength for
Grade 100 [690], users of this speciﬁcation should be aware that ACI 318
Type 1 mechanical splice requirements of 125 % of speciﬁed yield
strength requirements in tension and compression, found in many accep-
tance criteria, may result in an invalid mechanical splice qualiﬁcation or
veriﬁcation test when the tensile strength of the bar is between 117 000 psi
and 125 000 psi.
1.6 Annex A2 describes the methods for determination of
uniform elongation (El
u
). Annex A2 is mandatory when
Supplementary Requirement S1 is speciﬁed by the purchaser
(see 4.2.6).
1.7 Requirements for alternate bar sizes are presented in
Annex A1. The requirements in Annex A1 only apply when
speciﬁed by the purchaser (see 4.2.5).
1.8 The text of this speciﬁcation references notes and
footnotes that provide explanatory material. These notes and
footnotes, excluding those in tables, shall not be considered as
requirements of this speciﬁcation.
1.9 This speciﬁcation is applicable for orders in either
inch-pound units (Speciﬁcation A706) or in SI units [Speciﬁ-
cation A706M].
1.10 The values stated in either inch-pound units or SI units
are to be regarded separately as standard. Within the text, the
SI units are shown in brackets. The values stated in each
system may not be exact equivalents; therefore, each system
shall be used independently of the other. Combining values
from the two systems may result in non-conformance with this
speciﬁcation.
1.11 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 appro-
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
1.12 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1
This speciﬁcation is under the jurisdiction of ASTM Committee A01 on Steel,
Stainless Steel and Related Alloys and is the direct responsibility of Subcommittee
A01.05 on Steel Reinforcement.
Current edition approved Oct. 15, 2025. Published November 2025. Originally
approved in 1974. Last previous edition approved in 2024 as A706/A706M – 24.
DOI: 10.1520/A0706_A0706M-25.
*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
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
1

2. Referenced Documents
2.1 ASTM Standards:
2
A6/A6M Speciﬁcation for General Requirements for Rolled
Structural Steel Bars, Plates, Shapes, and Sheet Piling
A370 Test Methods and Deﬁnitions for Mechanical Testing
of Steel Products
A510/A510M Speciﬁcation for General Requirements for
Wire Rods and Coarse Round Wire, Carbon Steel, and
Alloy Steel
A615/A615M Speciﬁcation for Deformed and Plain Carbon-
Steel Bars for Concrete Reinforcement
A700 Guide for Packaging, Marking, and Loading Methods
for Steel Products for Shipment
A751 Test Methods and Practices for Chemical Analysis of
Steel Products
E8/E8M Test Methods for Tension Testing of Metallic Ma-
terials
E29 Practice for Using Signiﬁcant Digits in Test Data to
Determine Conformance with Speciﬁcations
E290 Test Methods for Bend Testing of Material for Ductil-
ity
2.2 AWS Standard:
3
AWS D1.4 ⁄D1.4M Structural Welding Code—Reinforcing
Steel
2.3 U.S. Military Standard:
4
MIL-STD-129 Marking for Shipment and Storage
2.4 U.S. Federal Standard:
4
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
2.5 ACI Building Code:
5
ACI Code-318 Building Code Requirements for Structural
Concrete and Commentary
2.6 Canadian Standards Association:
6
G30.18 Carbon steel bars for concrete reinforcement
2.7 ISO Standards:
7
ISO 15630–1 Steel for the reinforcement and prestressing of
concrete – Test methods – Part 1: Reinforcing bars, rods
and wire
3. Terminology
3.1 Deﬁnitions of Terms Speciﬁc to This Standard:
3.1.1 deformations, n—transverse protrusions on a de-
formed bar.
3.1.2 deformed bar, n—steel bar with protrusions; a bar that
is intended for use as reinforcement in reinforced concrete and
related construction.
3.1.2.1 Discussion—The surface of the bar is provided with
lugs or protrusions that inhibit longitudinal movement of the
bar relative to the concrete surrounding the bar in such
construction. The lugs or protrusions conform to the provisions
of this speciﬁcation.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at www.astm.org/contact. For Annual Book of
ASTM Standards volume information, refer to the standard’s Document Summary
page on the ASTM website.
3
Available from American Welding Society (AWS), 8669 NW 36 Street, #130,
Miami, FL 33166-6672, http://www.aws.org.
4
Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,
Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
www.dodssp.daps.mil.
5
Available from American Concrete Institute, 38800 Country Club Dr., Farm-
ington Hills, MI, 48331-3439, http://www.concrete.org.
6
Available from Canadian Standards Association (CSA), 178 Rexdale Blvd.,
Toronto, ON M9W 1R3, Canada, http://www.csagroup.org.
7
Available from International Organization for Standardization (ISO), ISO
Central Secretariat, Chemin de Blandonnet 8, CP 401, 1214 Vernier, Geneva,
Switzerland, https://www.iso.org.
TABLE 1 Deformed Bar Designation Numbers, Nominal Weights [Masses], Nominal Dimensions, and Deformation Requirements
Bar
Desig-
nation
No.
Nominal Weight, lb/ft
[Nominal Mass,
kg/m]
Nominal Dimensions
A
Deformation Requirements, in. [mm]
Diameter,
in. [mm]
Cross-Sectional Area
in.
2
[mm
2
]
Perimeter,
in. [mm]
Maximum Average
Spacing
Minimum Average
Height
Maximum Gap
(Chord of 12.5 % of
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
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
Grade 60
[420]
Grade 80
[550]
Grade 100
[690]
Tensile strength, min,
psi [MPa]
80 000
[550]
100 000
[690]
117 000
[805]
Yield strength, min,
psi [MPa]
60 000
[420]
80 000
[550]
100 000
[690]
Yield strength, max,
psi [MPa]
78 000
[540]
98 000
[675]
118 000
[815]
Ratio of actual tensile strength to
actual yield strength, min
1.25 1.25 1.17
Elongation in 8 in. [200 mm],
min, %
Bar Designation Nos.
3, 4, 5, 6 [10, 13, 16, 19] 14 12 10
7, 8, 9, 10, 11 [22, 25, 29, 32, 36] 12 12 10
14, 18 [43, 57] 10 10 10
A706/A706M − 25
2

3.1.3 lot, n—a deﬁnite quantity of bars manufactured from a
single heat, under conditions of uniform bar size, grade, and
pattern of deformations.
3.1.4 plain bar, n—steel bar without protrusions.
3.1.5 plastic component of uniform elongation, El [%],
n—the measurement of plastic strain taken remote from the
break to avoid localized necking of the bar, used for the
determination of uniform elongation (see Annex A2).
3.1.6 rib, n—longitudinal protrusion on a deformed bar.
3.1.7 uniform elongation, El
u
[%], n—the elongation deter-
mined at the maximum force sustained by the test piece just
prior to necking or fracture, or both (see Test Methods
E8/E8M).
4. Ordering Information
4.1 Orders for low-alloy steel bars for concrete reinforce-
ment under this speciﬁcation shall contain the following
information:
4.1.1 Quantity (weight) [mass],
4.1.2 Deformed or plain,
4.1.3 Bar designation number (size) of deformed bars, or
nominal diameter (size) of plain bars,
4.1.4 Cut lengths or coils,
4.1.5 Grade, and
4.1.6 ASTM designation and year of issue.
4.2 The purchaser shall have the option to specify additional
requirements, including but not limited to, the following:
4.2.1 Requirements for inspection (17.1),
4.2.2 Special package marking requirements (20.2),
4.2.3 Require bars in each bundle to be supplied from a
single heat (16.1),
4.2.4 Other special requirements, if any, and
4.2.5 Optional requirements of Annex A1, if applicable.
4.2.6 Supplementary requirements, if applicable.
5. Material and Manufacture
5.1 The bars shall be processed from properly identiﬁed
heats of mold-cast or strand-cast steel. The steel shall be made
by any commercially accepted process.
6. Chemical Composition
6.1 The chemical analysis of each heat shall be determined
in accordance with Test Methods and Practices A751. The
manufacturer shall make the analysis on test samples taken
preferably during the pouring of the heat. The percentages of
carbon, manganese, phosphorus, sulfur, silicon, copper, nickel,
chromium, molybdenum, and vanadium shall be determined.
6.2 The chemical composition as shown by heat analysis
shall be limited by the following:
Element max, %
Carbon
Manganese
0.30
1.50
Phosphorus 0.035
Sulfur 0.045
Silicon 0.50
6.3 Choice and use of alloying elements, combined with
carbon, phosphorus, and sulfur to produce the mechanical
properties prescribed in Table 2 and Table 3, shall be made by
the manufacturer. Elements commonly used include
manganese, silicon, copper, nickel, chromium, molybdenum,
vanadium, columbium, titanium, and zirconium.
6.4 The heat analysis shall be such as to provide a carbon
equivalent (C.E.) not exceeding 0.55 % as calculated by the
following formula:
C.E. 5% C1% Mn
61% Cu
40 1% Ni
20 1% Cr
10 2% Mo
50 2% V
10 (1)
6.5 Product (Check) Veriﬁcation Analysis—A product check
analysis made by the purchaser shall not exceed the following
percentages:
Element max, %
Carbon
Manganese
0.33 %
1.56 %
Phosphorus 0.043 %
Sulfur 0.053 %
Silicon 0.55 %
7. Requirements for Deformations
7.1 Deformations shall be spaced along the bar at substan-
tially uniform distances. The deformations on opposite sides of
the bar shall be similar in size, shape, and pattern.
7.2 The deformations shall be placed with respect to the axis
of the bar so that the included angle is not less than 45°. Where
the line of deformations forms an included angle with the axis
of the bar from 45° to 70°, inclusive, the deformations shall
reverse alternately in direction on each side, or those on one
side shall be reversed in direction from those on the opposite
side. Where the line of deformation is over 70°, a reversal in
direction shall not be required.
7.3 The average spacing or distance between deformations
on each side of the bar shall not exceed
7
⁄
10
of the nominal
diameter of the bar.
7.4 The overall length of deformations shall be such that the
gap (measured as a chord) between the ends of the deforma-
tions shall not exceed 12.5 % of the nominal perimeter of the
bar. Where the ends terminate in a rib, the width of the rib shall
be considered as the gap between these ends. The summation
of the gaps shall not exceed 25 % of the nominal perimeter of
the bar. The nominal perimeter of the bar shall be 3.1416 times
the nominal diameter.
7.5 The spacing, height, and gap of deformations shall
conform to the requirements prescribed in Table 1.
8. Measurements of Deformations
8.1 The average spacing of deformations shall be deter-
mined by measuring the length of a minimum of 10 spaces and
TABLE 3 Bend Test Requirements
Bar Designation No.
Pin Diameter for 180° Bend Tests
Grade 60
[420]
Grade 80
[550]
Grade 100
[690]
3, 4, 5 [10, 13, 16] 3d
A
3
1
⁄
2
d
A
3
1
⁄
2
d
6, 7, 8 [19, 22, 25] 4d5d5d
9, 10, 11 [29, 32, 36] 6d7d7d
14, 18 [43, 57] 8d9d9d
A
d= nominal diameter of specimen.
A706/A706M − 25
3

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标签： #合金钢 #低合金 #钢

摘要：

ASTM A706 - A 706M - 25 是涵盖混凝土配筋用变形和普通低合金钢筋的最新国际标准规范，适用于要求严格控制化学成分、可焊性及抗震性能的工程场景。该标准规定了低合金钢筋的尺寸、机械性能、弯曲试验、拉伸试验及标识要求，尤其适用于需要焊接或弯曲加工的结构应用。符合 ASTM A706 标准的钢筋具有更高的延性和韧性，特别适合地震区建筑、桥梁、水坝等对钢筋力学性能提出严格要求的混凝土构件。相比普通碳素钢筋，A706 低合金钢筋通过限制碳当量来提升可焊性，同时满足变形钢筋的粘结性能要求。

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ASTM A706 - A 706M - 25 混凝土配筋用变形和普通低合金钢筋的标准规范

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