ASTM A955 - A 955M - 20c

VIP免费

Carl 2024-09-02 13 293.94KB 16 页 14星币

Designation: A955/A955M −20c
Standard Speciﬁcation for
Deformed and Plain Stainless Steel Bars for Concrete
Reinforcement
1
This standard is issued under the ﬁxed designation A955/A955M; 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.
1. Scope*
1.1 This speciﬁcation covers deformed and plain stainless
steel bars for concrete reinforcement in cut lengths and coils
used in applications requiring resistance to corrosion, restric-
tive mechanical properties, or controlled magnetic permeabil-
ity. This speciﬁcation has a minimum actual tensile strength to
actual yield strength ratio (Table 3). The standard sizes and
dimensions of deformed bars and their numerical designation
shall be those listed in Table 1.
1.1.1 A supplementary requirement (S1) is provided for use
where a controlled magnetic permeability product is required
by the purchaser. Supplementary Requirement S1 applies only
when speciﬁed in the purchase order.
1.1.2 A supplementary controlled mechanical properties
requirement (S2) is provided for use where a restricted yield
strength range and a higher actual tensile to actual yield
strength ratio is required by the purchaser. Supplementary
Requirement S2 applies only when speciﬁed in the purchase
order.
1.2 The chemical composition of the stainless steel alloy
shall be selected for suitability to the application involved by
agreement between the manufacturer and the purchaser. This is
an important consideration in achieving the desired corrosion
resistance or controlled magnetic permeability, or both, be-
cause these properties are not provided by all stainless steels.
1.3 Corrosion Resistance requirements are contained in
Section 11 and Annex A1 and the test procedures options are
Annex A2 (Rapid Macrocell Test) or Annex A3 (Cracked
Beam Test).
1.4 The requirements for introduction of new alloys into a
mandatory chemical composition requirements table in this
speciﬁcation are given in Annex A5.
1.5 Requirements for the relative deformation area of three-
sided deformed bars are contained in Annex A4.
1.6 Bars are of three minimum yield strength levels, namely,
60 000 psi [420 MPa], 75 000 psi [520 MPa], and 80 000 psi
[550 MPa], designated as Grade 60 [420], Grade 75 [520], or
Grade 80 [550], respectively.
1.7 Plain bars in sizes up to and including 2 in. [50.8 mm]
in diameter in coils or cut lengths are furnished in accordance
with this speciﬁcation in Grade 60 [420], Grade 75 [520], and
Grade 80 [550], respectively. Mechanical testing, when
required, shall be to the nearest nominal deformed bar size.
Requirements providing for deformations and marking shall
not be applicable to plain bars.
1.8 When stainless steel is to be welded, use a procedure
suitable for the chemical composition and intended use or
service.
NOTE 1—Welding of stainless steel reinforcement would occur after
shipment from the manufacturer. Structural welding should be performed
in accordance with the latest edition of AWS D1.6/D1.6M, any other
internationally accepted stainless steel welding code, or a procedure
suggested by the material manufacturer. AWS D1.6/D1.6M describes the
proper selection of the ﬁller metals, temperature control, as well as,
performance, procedure qualiﬁcation and inspection requirements.
1.9 This speciﬁcation is applicable for orders in either
inch-pound units (as Speciﬁcation A955) or in SI units (as
Speciﬁcation A955M).
1.10 The text of this speciﬁcation references notes and
footnotes which provide explanatory material. These notes and
footnotes (excluding those in tables and ﬁgures) shall not be
considered as requirements of the speciﬁcation.
1.11 The values stated in either inch-pound 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 nonconformance with the speciﬁcation.
1.12 This speciﬁcation 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 speciﬁcation to establish
appropriate safety, health, and environmental practices and
determine the applicability of regulatory limitations prior to
use.
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 May 1, 2020. Published May 2020. Originally
approved in 1996. Last previous edition approved in 2020 as A955/A955M – 20b.
DOI: 10.1520/A0955_A0955M-20C.
*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.

TABLE 1 Deformed Bar Designation Numbers, Nominal Weights [Masses], Nominal Dimensions, and Deformation Requirements

Bar

Designation

No.

Nominal Weight, lb/ft [Nominal Mass,

kg/m]

Nominal Dimensions

Deformation Requirements, in. [mm]

Duplex Alloys 300 Series Diameter, in. [mm] Cross-Sectional

Area, in.

[mm

]

Perimeter, in.

[mm]

Maximum

Average Spacing

Minimum Average

Height

Maximum Gap per Side

Two-Sided

Bar

Three-Sided

Bar

3 [10] 0.374 [0.556] 0.378 [0.562] 0.375 [9.5] 0.11 [71] 1.178 [29.9] 0.262 [6.7] 0.015 [0.38] 0.143 [3.6] 0.097 [2.5]

4 [13] 0.679 [1.011] 0.686 [1.021] 0.500 [12.7] 0.20 [129] 1.571 [39.9] 0.350 [8.9] 0.020 [0.51] 0.191 [4.9] 0.129 [3.3]

5 [16] 1.048 [1.559] 1.058 [1.575] 0.625 [15.9] 0.31 [199] 1.963 [49.9] 0.437 [11.1] 0.028 [0.71] 0.239 [6.1] 0.162 [4.1]

6 [19] 1.495 [2.225] 1.511 [2.248] 0.750 [19.1] 0.44 [284] 2.356 [59.8] 0.525 [13.3] 0.038 [0.97] 0.286 [7.3] 0.194 [4.9]

7 [22] 2.038 [3.032] 2.059 [3.064] 0.875 [22.2] 0.60 [367] 2.749 [69.8] 0.612 [15.5] 0.044 [1.12] 0.334 [8.5] 0.226 [5.8]

8 [25] 2.685 [3.995] 2.713 [4.037] 1.000 [25.4] 0.79 [510] 3.142 [79.8] 0.700 [17.8] 0.050 [1.27] 0.383 [9.7] 0.259 [6.6]

9 [29] 3.396 [5.053] 3.441 [5.106] 1.128 [28.7] 1.00 [645] 3.544 [90.0] 0.790 [20.1] 0.056 [1.42] 0.431 [10.9] 0.292 [7.4]

10 [32] 4.312 [6.416] 4.358 [6.484] 1.270 [32.3] 1.27 [819] 3.990 [101.3] 0.889 [22.6] 0.064 [1.63] 0.487 [12.4] 0.329 [8.3]

11 [36] 5.296 [7.880] 5.352 [7.964] 1.410 [35.8] 1.56 [1006] 4.430 [112.5] 0.987 [25.1] 0.071 [1.80] 0.540 [13.7] 0.365 [9.3]

14 [43] 7.64 [11.37] 7.72 [11.49] 1.693 [43.0] 2.25 [1452] 5.32 [135.1] 1.185 [30.1] 0.085 [2.16] 0.648 [16.5] 0.438 [11.1]

18 [57] 13.59 [20.22] 13.72 [20.43] 2.257 [57.3] 4.00 [2581] 7.09 [180.1] 1.58 [40.1] 0.102 [2.59] 0.864 [21.9] 0.584 [14.8]

The Duplex-Alloy Series is based on a density of 489.59 lb/ft

[7833.4 kg/m

]. The 300 Series is based on a density of 494.78 lb/ft

[7916.5 kg/m

]. Density varies with alloy content which may result in a variation of

several percent.

The nominal dimensions of a deformed bar are equivalent to those of a round bar having the same weight [mass] per foot [metre] as the deformed bar.

The maximum gap (measured as a chord) between the ends of the deformations shall not exceed 25 % ⁄nof the nominal perimeter of the bar, where nis the number of longitudinal gaps or longitudinal ribs around

the perimeter of the bar.

A955/A955M − 20c

1.13 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.
2. Referenced Documents
2.1 ASTM Standards:
2
A6/A6M Speciﬁcation for General Requirements for Rolled
Structural Steel Bars, Plates, Shapes, and Sheet Piling
A342/A342M Test Methods for Permeability of Weakly
Magnetic Materials
A370 Test Methods and Deﬁnitions for Mechanical Testing
of Steel Products
A484/A484M Speciﬁcation for General Requirements for
Stainless Steel Bars, Billets, and Forgings
A751 Test Methods, Practices, and Terminology for Chemi-
cal Analysis of Steel Products
A941 Terminology Relating to Steel, Stainless Steel, Related
Alloys, and Ferroalloys
C192/C192M Practice for Making and Curing Concrete Test
Specimens in the Laboratory
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
E527 Practice for Numbering Metals and Alloys in the
Uniﬁed Numbering System (UNS)
G3 Practice for Conventions Applicable to Electrochemical
Measurements in Corrosion Testing
2.2 U.S. Military Standard:
3
MIL-STD-129 Marking for Shipment and Storage
2.3 U.S. Federal Standard:
3
Fed. Std. No. 123 Marking for Shipment (Civil Agencies)
2.4 AWS Standard:
4
AWS D1.6/D1.6M Structural Welding Code – Stainless
Steel
2.5 SAE Document:
5
SAE J 1086 Recommended Practice for Numbering Metals
and Alloys
3. Terminology
3.1 Deﬁnitions—For deﬁnitions of terms used in this
speciﬁcation, refer to 3.2 and Terminology A941.
3.2 Deﬁnitions:Deﬁnitions of Terms Speciﬁc to This Speci-
ﬁcation:
3.2.1 deformations, n—transverse protrusions on a de-
formed bar.
3.2.2 deformed bar, n—steel bar with protrusions; a bar that
is intended for use as reinforcement in reinforced concrete
construction.
3.2.2.1 Discussion—The surface of the bar is provided with
protrusions that inhibit longitudinal movement of the bar
relative to the concrete surrounding the bar in such construc-
tion. The protrusions conform to the provisions of this speci-
ﬁcation.
3.2.3 lot, n—all of the bars of one bar designation number
and pattern of deformations contained in an individual shipping
release or shipping order.
3.2.4 plain bar, n—steel bar without protrusions.
3.2.5 relative deformation area, n—the ratio of the defor-
mation bearing area (projected deformation area normal to the
bar axis) to the shearing area (nominal bar perimeter times the
average spacing of the deformations.
3.2.6 rib, n—longitudinal protrusion on a deformed bar.
3.2.7 three-sided bar, n—deformed steel bar with three rows
of transverse deformations.
3.2.8 two-sided bar, n—deformed steel bar with two rows of
transverse deformations.
4. Ordering Information
4.1 Orders for stainless steel bars for concrete reinforcement
under this speciﬁcation shall contain the following informaton
4.1.1 Quantity (weight) [mass],
4.1.2 Deformed or plain,
4.1.3 UNS number,
4.1.4 Bar designation number (size) of deformed bars or
nominal diameter (size) of plain bars,
4.1.5 Cut lengths or coils,
4.1.6 Grade (strength level), and
4.1.7 ASTM designation A955 [A955M] 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 (20.1),
4.2.2 Packaging and package marking (Section 23),
4.2.3 Magnetic permeability supplementary requirement
(S1),
4.2.4 Controlled mechanical properties supplementary re-
quirement (S2), and
4.2.5 Other special requirements, if any.
5. Materials 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 acceptable process.
6. Chemical Composition
6.1 The steel shall conform to the requirements for chemical
composition speciﬁed in Table 2.
NOTE 2—Mechanical splices and headed bars produced from any of the
UNS stainless steel alloy designations listed in Table 2 are fully inter-
changeable and suitable for use with stainless steel bars of any UNS
designation listed in Table 2.
6.2 The chemical analysis of each heat of steel shall be
determined in accordance with Test Methods, Practices, and
2
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
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3
Available from DLA Document Services, Building 4/D, 700 Robbins Ave.,
Philadelphia, PA 19111-5094, http://quicksearch.dla.mil.
4
Available from American Welding Society (AWS), 8669 NW 36 St., #130,
Miami, FL 33166-6672, http://www.aws.org.
5
Available from SAE International (SAE), 400 Commonwealth Dr., Warrendale,
PA 15096, http://www.sae.org.
A955/A955M − 20c
3

文档加载中……请稍候！
如果长时间未打开，您也可以点击刷新试试。

下载文档到电脑，查找使用更方便

亲，本站95%以上的标准规范都面向会员免费，办理VIP会员下载更省钱，平均每篇不到2元

立即下载 VIP免费下载

摘要：

ASTM A955 - A 955M - 20c 是美国材料与试验协会发布的最新版标准规范，专门针对不锈钢钢筋混凝土用变形和光圆钢筋的技术要求。该标准涵盖了奥氏体、铁素体、马氏体和双相不锈钢等多种材料类型，规定了钢筋的化学成分、拉伸性能、弯曲性能、尺寸公差及质量要求。与普通碳钢钢筋相比，不锈钢钢筋具有优异的耐腐蚀性能，特别适用于海洋环境、桥梁、隧道、污水处理设施以及需要长寿命或低维护成本的特殊混凝土工程。该标准还包含公制（A955M）与英制（A955）两套单位体系，便于全球工程设计与采购统一引用

展开>> 收起<<

ASTM A955 - A 955M - 20c.pdf

共16页,预览4页

还剩页未读，继续阅读

声明：本文档系会员上传，若文档所含内容侵犯了您的版权或隐私，请立即通知，我们立即给予侵权申诉删除！

ASTM A955 - A 955M - 20c

相关推荐

开通VIP享超值会员特权

相关内容

热门标签

举报选择: