1、Designation: A955/A955M 17aA955/A955M 18Standard Specification forDeformed and Plain Stainless-Steel Stainless Steel Bars forConcrete Reinforcement1This standard is issued under the fixed designation A955/A955M; the number immediately following the designation indicates the yearof original adoption
2、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 stainless steel
3、 bars for concrete reinforcement in cut lengths andcoils used in applications requiring resistance to corrosion or controlled magnetic permeability. The standard sizes and dimensionsof deformed bars and their numerical designation shall be those listed in Table 1. The text of this specification refe
4、rences notesand footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not beconsidered as requirements of the specification.1.1.1 Supplementary requirement (S1) of an optional nature is provided. It shall apply only when specified by th
5、e purchaser.In order to obtain a 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 an
6、d the purchaser. This is an important consideration in achieving the desired corrosionresistance or controlled magnetic permeability, or both, because these properties are not provided by all stainless steels.NOTE 1The austenitic and austenitic-ferritic (duplex) alloys shown in Table 2 have found th
7、e most use in North America. are known to be sold byproducers to the requirements of this specification. It provides guidance and is not a mandatory chemical composition table. Other alloys may also providedesired properties; consult with the manufacturer for stainless steel alloy properties and ava
8、ilability. After adoption of Annex A5, a mandatory chemicalcomposition requirements table will be balloted in accordance with its requirements. This note and references to Specification A276/A276M will besimultaneously removed.1.3 The requirements for introduction of new alloys into a mandatory chem
9、ical composition requirements table in thisspecification are given in Annex A5.1.4 Requirements for the relative deformation area of three-sided deformed bars are contained in Annex A4.1.5 Bars are of two minimum yield strength levels, namely, 60 000 psi 420 MPa and 75 000 psi 520 MPa, designated as
10、Grade 60 420 and Grade 75 520, respectively.1.6 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 byagreement
11、between the manufacturer and purchaser. Requirements providing for deformations and marking shall not be applicableto plain bars.1.7 When stainless steel is to be welded, use a procedure suitable for the chemical composition and intended use or service.NOTE 2Welding of stainless steel reinforcement
12、would occur after shipment from the producer. Structural welding should be performed in accordancewith the latest edition of AWS D1.6/D1.6M, any other internationally accepted stainless steel welding code, or a procedure suggested by the materialproducer. AWS D1.6/D1.6M describes the proper selectio
13、n of the filler metals, temperature control, as well as, performance, procedure qualification andinspection requirements.1.8 This specification is applicable for orders in either inch-pound units (as Specification A955) or in SI units (as SpecificationA955M).1.9 The values stated in either inch-poun
14、d or SI units are 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
15、with the standard.1 This specification 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. 1, 2017Jan. 1, 2018. Published September 2017February 2018. O
16、riginally approved in 1996. Last previous edition approved in 2017 asA955/A955M 17.A955/A955M 17a. DOI: 10.1520/A0955_A0955M-17A.10.1520/A0955_A0955M-18.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
17、the previous version. Becauseit may 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 Summar
18、y of Changes section appears at the 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
19、.Nominal Weight, lb/ft Nominal Mass,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 0.37
20、8 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 2.54 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
21、 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 4.97 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.
22、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 7.410 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.
23、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 11.118 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
24、 is based on a density of 494.78 lb/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
25、 (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 aroundthe perimeter of the bar.A955/A955M1821.10 This specification does not purport to address all of the safety c
26、oncerns, if any, associated with its use. It is theresponsibility of the user of this specification to establish appropriate safety, health, and environmental practices and determinethe applicability of regulatory limitations prior to use.1.11 This international standard was developed in accordance
27、with internationally recognized principles on 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 Standard
28、s:2A6/A6M Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet PilingA276A276/A276M Specification for Stainless Steel Bars and ShapesA342/A342M Test Methods for Permeability of Weakly Magnetic MaterialsA370 Test Methods and Definitions for Mechanical Tes
29、ting of Steel ProductsA510A484/A484M Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon SteelStainless SteelBars, Billets, and ForgingsA510M Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel (Metric) (Withdrawn2011)3A751 Test Met
30、hods, Practices, and Terminology for Chemical Analysis of Steel ProductsC192/C192M Practice for Making and 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
31、 for DuctilityG15G3 Terminology Relating to Corrosion and Corrosion Practice for Conventions Applicable to Electrochemical Measure-ments in Corrosion Testing (Withdrawn 2010)2.2 U.S. Military Standard:3MIL-STD-129 Marking for Shipment and Storage2.3 U.S. Federal Standard:3Fed. Std. No. 123 Marking f
32、or Shipment (Civil Agencies)2.4 AWS Standard:4AWS D1.6/D1.6M Structural Welding Code Stainless Steel3. 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 with protrusions; a bar that is inten
33、ded for use as reinforcement in reinforced concreteconstruction.3.1.2.1 Discussion2 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
34、 on the ASTM website.3 Available from Standardization Documents Order Desk, DODSSP, Bldg. 4, Section D, DLA Document Services, Building 4/D, 700 Robbins Ave., Philadelphia, PA19111-5098, http:/www.dodssp.daps.mil.19111-5094, http:/quicksearch.dla.mil.4 Available from American Welding Society (AWS),
35、8669 NW 36 St., #130, Miami, FL 33166-6672, http:/www.aws.org.TABLE 2 Chemical Requirements of Typical AlloysAUNSDesignationComposition %Type Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Molybdenum NitrogenS24000 XM-29 0.08 11.50-14.500.060 0.030 1.00 17.00-19.002.25-3.750.20-0.40S2410
36、0 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 18.00-20.008.00-10.500.10S31603 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
37、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 183The 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 co
38、nform 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 de
39、formations.3.1.5 rib, nlongitudinal protrusion on a deformed bar.3.1.6 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
40、.4. Ordering Information4.1 It shall be the responsibility of 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
41、 plain stainless steel bars for concrete reinforcement),4.1.3 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 (2
42、0.1),4.1.11 Packaging (see Section 24),4.1.12 Supplementary requirement (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
43、heat treatment conditions, as shown in Specification A276A276/A276M, andas needed to 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. An
44、y further heat treatment of the material mayalter those properties and 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
45、be determined in accordance with Test Methods, Practices, andTerminology 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
46、 1 ofSpecification A276A276/A276M and shall conform to all applicable requirements in Specification A484/A484M.7. Requirements for Deformations7.1 Deformations shall be spaced along the bar at substantially uniform distances. The deformations on all sides of the bar shallbe similar in size, shape, a
47、nd 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 deformations 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
48、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 reverse 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 sp
49、acing 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 deformations 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 longit
