1、Designation: A955/A955M 16aA955/A955M 17Standard Specification forDeformed and Plain Stainless-Steel Bars for ConcreteReinforcement1This standard is issued under the fixed designation A955/A955M; the number immediately following the designation indicates the yearof original adoption or, in the case
2、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
3、 in cut lengths and coils used inapplications requiring resistance to corrosion or controlled magnetic permeability. The standard sizes and dimensions of deformedbars and their numerical designation shall be those listed in Table 1. The text of this specification references notes and footnoteswhich
4、provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered asrequirements of the specification.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
5、 controlled magnetic permeability product, steel conforming to Supplementary Requirement S1 should beordered.1.2 The chemical composition of the stainless steel alloy shall be selected for suitability to the application involved byagreement between the manufacturer and the purchaser. This is an impo
6、rtant consideration in achieving the desired corrosionresistance or controlled magnetic permeability, or both, because these properties are not provided by all stainless steels.NOTE 1The alloys shown in Table 2 have found the most use in North America. Other alloys may also provide desired propertie
7、s; consult with themanufacturer for stainless steel alloy properties and availability.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
8、 as Grade60 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 furnishedunder this specification in Grade 60 420 and Grade 75 520, respectively. Bending properties, when required, shall be byagreeme
9、nt between the manufacturer and purchaser. Requirements providing for deformations and marking shall not be applicableto plain bars.1.6 Weldability of most stainless steel compositions is generally good, however, pre-weld or post-weld procedures, or both, arenecessary. Where material is to be welded
10、, a welding procedure suitable for the chemical composition and intended use or serviceshall be used. Retesting of physical properties should be considered following welding procedures depending upon the steelcomposition and welding operation involved.NOTE 2It is recommended that the user consult th
11、e manufacturer for information available from the Nickel Development Institute (NIDI) (Toronto,Canada).1.7 This specification is applicable for orders in either inch-pound units (as Specification A955) or in SI units (as SpecificationA955M).1.8 The values stated in either inch-pound or SI units are
12、to be regarded separately as standard. Within the text, the SI units areshown in brackets. The values stated in each system are not exact equivalents; therefore, each system shall be used independentlyof the other. Combining values from the two systems may result in nonconformance with the standard.
13、1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.1 This specificat
14、ion is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and is the direct responsibility of Subcommittee A01.05on Steel Reinforcement.Current edition approved Sept. 15, 2016March 15, 2017. Published September 2016April 2017. Originally approved in 1996. Last pr
15、evious edition approved in 2016 asA955/A955M 16.A955/A955M 16a. DOI: 10.1520/A0955_A0955M-16A.10.1520/A0955_A0955M-17.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may
16、 not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the
17、 end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1TABLE 1 Deformed Bar Designation Numbers, Nominal Weights Masses, Nominal Dimensions, and Deformation RequirementsBarDesignationNo.Nominal Weight, lb/ft Nominal Mass
18、,kg/mA Nominal DimensionsB Deformation Requirements, in. mm400 Series;Duplex Alloys 300 SeriesDiameter, in.mmCross-SectionalArea, in.2 mm2Perimeter, in.mmMaximumAverage SpacingMinimumAverage HeightMaximum Gap per SideCTwo-SidedBarThree-SidedBar3 10 0.374 0.556 0.378 0.562 0.375 9.5 0.11 71 1.178 29.
19、9 0.262 6.7 0.015 0.38 0.143 3.6 0.097 2.54 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 3.35 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 4.16 19 1.495 2.225 1.511 2.248 0.750 19.1 0.44 284 2.356 59
20、.8 0.525 13.3 0.038 0.97 0.286 7.3 0.194 4.97 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 5.88 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 6.69 29 3.396 5.053 3.441 5.106 1.128 28.7 1.00 645 3.544
21、 90.0 0.790 20.1 0.056 1.42 0.431 10.9 0.292 7.410 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 8.311 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 9.314 43 7.64 11.37 7.72 11.49 1.693 43.0 2.25
22、 1452 5.32 135.1 1.185 30.1 0.085 2.16 0.648 16.5 0.438 11.118 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 14.8A 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
23、/ft3 7916.5 kg/m3. Density varies with alloy content which may result in a variationof 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
24、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 aroundthe perimeter of the bar.A955/A955M1721.10 This international standard was developed in accordance with internationally recognized principles on
25、 standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requireme
26、nts for Rolled Structural Steel Bars, Plates, Shapes, and Sheet PilingA276 Specification for Stainless Steel Bars and ShapesA342/A342M Test Methods for Permeability of Weakly Magnetic MaterialsA370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA510 Specification for General Re
27、quirements for Wire Rods and Coarse Round Wire, Carbon SteelA510M Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel (Metric) (Withdrawn2011)3A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel ProductsC192/C192M Practice for Making and
28、Curing Concrete Test Specimens in the LaboratoryE29 Practice for Using Significant Digits in Test Data to Determine Conformance with SpecificationsE290 Test Methods for Bend Testing of Material for DuctilityG15 Terminology Relating to Corrosion and Corrosion Testing (Withdrawn 2010)32.2 U.S. Militar
29、y Standard:4MIL-STD-129 Marking for Shipment and Storage2.3 U.S. Federal Standard:4Fed. Std. No. 123 Marking for Shipment (Civil Agencies)3. Terminology3.1 Definitions of Terms Specific to This Specification:3.1.1 deformations, ntransverse protrusions on a deformed bar.3.1.2 deformed bar, nsteel bar
30、 with protrusions; a bar that is intended for use as reinforcement in reinforced concreteconstruction.3.1.2.1 DiscussionThe surface of the bar is provided with protrusions that inhibit longitudinal movement of the bar relative to the concretesurrounding the bar in such construction. The protrusions
31、conform to the provisions of this specification.3.1.3 plain bar, nsteel bar without protrusions.3.1.4 relative deformation area, nthe ratio of the deformation bearing area (projected deformation area normal to the bar axis)to the shearing area (nominal bar perimeter times the average spacing of the
32、deformations.3.1.5 rib, nlongitudinal protrusion on a deformed bar.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM we
33、bsite.3 The last approved version of this historical standard is referenced on www.astm.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.TABLE 2 Chemical Requirements of Typical AlloysAUNSD
34、esignationComposition %Type Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Molybdenum NitrogenS24000 XM-29 0.08 11.50-14.500.060 0.030 1.00 17.00-19.002.25-3.750.20-0.40S24100 XM-28 0.15 11.00-14.000.060 0.030 1.00 16.50-19.000.50-2.500.20-0.45S30400 304 0.08 2.00 0.045 0.030 1.00 18.00-
35、20.008.00-10.500.10S31603 316L 0.03 2.00 0.045 0.030 1.00 16.00-18.0010.00-14.002.00-3.00 0.10S31653 316LN 0.03 max 2.00 0.045 0.030 1.00 16.00-18.0010.00-14.002.00-3.00 0.10-0.16S31803 0.03 2.00 0.030 0.020 1.00 21.00-23.004.50-6.502.50-3.50 0.08-0.20A Maximum, unless otherwise indicated.A955/A955M
36、 1733.1.6 stainless steel, na steel that contains 11 % or more chromium.3.1.7 three-sided bar, ndeformed steel bar with three rows of transverse deformations.3.1.8 two-sided bar, ndeformed steel bar with two rows of transverse deformations.4. Ordering Information4.1 It shall be the responsibility of
37、 the purchaser to specify all requirements that are necessary for material ordered to thisspecification. Such requirements shall include but are not limited to the following:4.1.1 Quantity (weight) mass,4.1.2 Name of material (deformed and plain stainless steel bars for concrete reinforcement),4.1.3
38、 Chemical composition (stainless steel alloy),4.1.4 Heat treatment condition,4.1.5 Size,4.1.6 Cut lengths or coils,4.1.7 Deformed or plain,4.1.8 Grade (strength level),4.1.9 Descaling method and finish,4.1.10 Requirements for inspection (20.1),4.1.11 Packaging (see Section 24),4.1.12 Supplementary r
39、equirement (if desired), and4.1.13 ASTM designation and year of issue.5. Materials and Manufacture5.1 The bars shall be rolled from properly identified heats of mold or strand cast steel.5.2 Bars shall be furnished in one of the following heat treatment conditions, as shown in Specification A276, an
40、d as neededto meet the requirements of this specification.5.2.1 Annealed (A).5.2.2 Hot rolled (HR).5.2.3 Strain hardened (B).NOTE 3The mechanical properties of the material result from the heat treat condition of the material. Any further heat treatment of the material mayalter those properties and
41、affect their ability to meet the specified strength level. No re-treatment should be imposed without retesting to the requirementsof this specification.6. Chemical Composition6.1 The chemical analysis of each heat of steel shall be determined in accordance with Test Methods, Practices, andTerminolog
42、y A751. The manufacturer shall make the analysis on test samples taken preferably during the pouring of the heat.6.2 The chemical composition agreed to between manufacturer and purchaser shall conform to the requirements in Table 1 ofSpecification A276.7. Requirements for Deformations7.1 Deformation
43、s shall be spaced along the bar at substantially uniform distances. The deformations on all sides of the bar shallbe 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. Wherethe line of deformati
44、ons forms an included angle with the axis of the bar of from 45 to 70 inclusive, the deformations on atwo-sided bar shall alternately reverse in direction on each side or those on one side shall be reversed in direction from those onthe opposite side. The deformations on three-sided bars shall rever
45、se on one of the three sides (see Fig. 1). Where the line ofdeformation is over 70, a reversal in direction is not required.7.3 The average spacing or distance between deformations on each side of the bar shall not exceed seven tenths of the nominaldiameter of the bar.7.4 The overall length of defor
46、mations shall be such that the gap (measured as a chord) between the ends of the deformationsshall not exceed 25 %n, where n is the number of longitudinal gaps or longitudinal ribs, of the nominal perimeter of the bar.Wherethe ends of the deformations terminate in a longitudinal rib, the width of th
47、e longitudinal rib shall be considered as the gap betweenthese ends. The summation of the gaps shall not exceed 25 % of the nominal perimeter of the bar. The nominal perimeter of thebar shall be 3.1416 times the nominal diameter.7.5 The spacing, height, and gap of deformations shall conform to the r
48、equirements prescribed in Table 1.A955/A955M 1748. Measurement of Deformations8.1 The average spacing of deformations shall be determined by measuring the length of a minimum of ten spaces and dividingthat length by the number of spaces included in the measurement. The measurement shall begin from a
49、 point on a deformation atthe beginning of the first space to a corresponding point on a deformation after the last included space. Spacing measurements shallnot be made over a bar area containing bar marking symbols.8.2 The average height of deformations shall be determined from measurements made on not le
