ASTM A955 / A955M - 17a

    Standard Specification for Deformed and Plain Stainless-Steel Bars for Concrete Reinforcement

    Active Standard ASTM A955 / A955M | Developed by Subcommittee: A01.05

    Book of Standards Volume: 01.04


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    Abstract

    This specification covers deformed and plain stainless steel bars for concrete reinforcement proposed to be used in applications requiring corrosion resistance or controlled magnetic permeability. For each specimen, one tension test, one bend test, if required, and one set of dimensional property tests shall be made. For martensitic materials, two hardness tests shall be performed per lot of material. If the results of the test fail to meet the specified minimum requirements, a retest shall be permitted on two random specimens for each original tension specimen failure from the lot. If a specimen fails a bend test due to reasons other than mechanical or flaws, a retest shall be permitted on two random specimens from the same lot.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    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 or controlled magnetic permeability. The standard sizes and dimensions of deformed bars and their numerical designation shall be those listed in Table 1. 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.

    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]A

     

    Nominal DimensionsB

     

    Deformation Requirements, in. [mm]

    400 Series; Duplex Alloys

    300 Series

     

    Diameter, in. [mm]

    Cross-Sectional Area, in.2 [mm2]

    Perimeter, in. [mm]

     

    Maximum Average Spacing

    Minimum Average Height

    Maximum Gap per SideC

     

     

    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]

    (A) The 400 and Duplex-Alloy Series is based on a density of 489.59 lb/ft3 [7833.4 kg/m3 ]. The 300 Series is based on a density of 494.78 lb/ft3 [7916.5 kg/m3]. Density varies with alloy content which may result in a variation of several percent.
    (B) 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.
    (C) The maximum gap (measured as a chord) between the ends of the deformations shall not exceed 25 %/n of the nominal perimeter of the bar, where n is the number of longitudinal gaps or longitudinal ribs around the perimeter of the bar.

    1.1.1 Supplementary requirement (S1) of an optional nature is provided. It shall apply only when specified by the purchaser. In order to obtain a controlled magnetic permeability product, steel conforming to Supplementary Requirement S1 should be ordered.

    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, because these properties are not provided by all stainless steels.

    Note 1: The alloys shown in Table 2 have found the most use in North America. Other alloys may also provide desired properties; consult with the manufacturer for stainless steel alloy properties and availability.

    TABLE 2 Chemical Requirements of Typical AlloysA

    UNS
    Designation

     

    Composition %

    Type

    Carbon

    Manganese

    Phosphorus

    Sulfur

    Silicon

    Chromium

    Nickel

    Molybdenum

    Nitrogen

    S24000

    XM-29

    0.08

    11.50-
    14.50

    0.060

    0.030

    1.00

    17.00-
    19.00

    2.25-
    3.75

    ....

    0.20-
    0.40

    S24100

    XM-28

    0.15

    11.00-
    14.00

    0.060

    0.030

    1.00

    16.50-
    19.00

    0.50-
    2.50

    ....

    0.20-
    0.45

    S30400

    304

    0.08

    2.00

    0.045

    0.030

    1.00

    18.00-
    20.00

    8.00-
    10.50

    ....

    0.10

    S31603

    316L

    0.03

    2.00

    0.045

    0.030

    1.00

    16.00-
    18.00

    10.00-
    14.00

    2.00-3.00

    0.10

    S31653

    316LN

    0.03 max

    2.00

    0.045

    0.030

    1.00

    16.00-
    18.00

    10.00-
    14.00

    2.00-3.00

    0.10-
    0.16

    S31803

    ....

    0.03

    2.00

    0.030

    0.020

    1.00

    21.00-
    23.00

    4.50-
    6.50

    2.50-3.50

    0.08-
    0.20

    (A) Maximum, unless otherwise indicated.

    1.3 Requirements for the relative deformation area of three-sided deformed bars are contained in Annex A4.

    1.4 Bars are of two minimum yield strength levels, namely, 60 000 [420 MPa] and 75 000 psi [520 MPa], designated as Grade 60 [420] and Grade 75 [520], respectively.

    1.5 Plain bars 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 in Grade 60 [420] and Grade 75 [520], respectively. Bending properties, when required, shall be by agreement between the manufacturer and purchaser. Requirements providing for deformations and marking shall not be applicable to plain bars.

    1.6 When stainless steel is to be welded, use a procedure suitable for the chemical composition and intended use or service.

    Note 2: Welding of stainless steel reinforcement would occur after shipment from the producer. 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 producer. AWS D1.6/D1.6M describes the proper selection of the filler metals, temperature control, as well as, performance, procedure qualification and inspection requirements.

    1.7 This specification is applicable for orders in either inch-pound units (as Specification A955) or in SI units (as Specification A955M).

    1.8 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 are not exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with the standard.

    1.9 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.

    1.10 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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    A6/A6M Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling

    A276 Specification for Stainless Steel Bars and Shapes

    A342/A342M Test Methods for Permeability of Weakly Magnetic Materials

    A370 Test Methods and Definitions for Mechanical Testing of Steel Products

    A510 Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel

    A510M Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel (Metric)

    A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products

    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 Ductility

    G15 Terminology Relating to Corrosion and Corrosion Testing

    U.S. Military Standard

    MIL-STD-129

    AWS Standard

    AWS D1.6/D1.6M Structural Welding Code Stainless Steel


    ICS Code

    ICS Number Code 77.140.60 (Steel bars and rods)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/A0955_A0955M-17A

    Citation Format

    ASTM A955 / A955M-17a, Standard Specification for Deformed and Plain Stainless-Steel Bars for Concrete Reinforcement, ASTM International, West Conshohocken, PA, 2017, www.astm.org

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