1、Designation: A955/A955M 16aStandard 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 of revision,
2、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 lengt
3、hs and coilsused in applications requiring resistance to corrosion or con-trolled magnetic permeability. The standard sizes and dimen-sions of deformed bars and their numerical designation shall bethose listed in Table 1. The text of this specification referencesnotes and footnotes which provide exp
4、lanatory material. Thesenotes and footnotes (excluding those in tables and figures) shallnot be considered as requirements of the specification.1.1.1 Supplementary requirement (S1) of an optional natureis provided. It shall apply only when specified by the purchaser.In order to obtain a controlled m
5、agnetic permeability product,steel conforming to Supplementary Requirement S1 should beordered.1.2 The chemical composition of the stainless steel alloyshall be selected for suitability to the application involved byagreement between the manufacturer and the purchaser. This isan important considerat
6、ion in achieving the desired corrosionresistance or controlled magnetic permeability, or both, be-cause these properties are not provided by all stainless steels.NOTE 1The alloys shown in Table 2 have found the most use in NorthAmerica. Other alloys may also provide desired properties; consult witht
7、he manufacturer 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 asGrade 60 420 a
8、nd Grade 75 520, respectively.1.5 Plain bars in sizes up to and including 2 in. 50.8 mmin diameter in coils or cut lengths, when ordered, shall befurnished under this specification in Grade 60 420 and Grade75 520, respectively. Bending properties, when required,shall be by agreement between the manu
9、facturer and purchaser.Requirements providing for deformations and marking shallnot be applicable to plain bars.1.6 Weldability of most stainless steel compositions isgenerally good, however, pre-weld or post-weld procedures, orboth, are necessary. Where material is to be welded, a weldingprocedure
10、suitable for the chemical composition and intendeduse or service shall be used. Retesting of physical propertiesshould be considered following welding procedures dependingupon the steel composition and welding operation involved.NOTE 2It is recommended that the user consult the manufacturer forinfor
11、mation available from the Nickel Development Institute (NIDI)(Toronto, Canada).1.7 This specification is applicable for orders in eitherinch-pound units (as Specification A955) or in SI units (asSpecification A955M).1.8 The values stated in either inch-pound or SI units are tobe regarded separately
12、as standard. Within the text, the SI unitsare shown in brackets. The values stated in each system are notexact equivalents; therefore, each system shall be used inde-pendently of the other. Combining values from the two systemsmay result in nonconformance with the standard.1.9 This standard does not
13、 purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards
14、:2A6/A6M Specification for General Requirements for RolledStructural Steel Bars, Plates, Shapes, and Sheet PilingA276 Specification for Stainless Steel Bars and ShapesA342/A342M Test Methods for Permeability of WeaklyMagnetic MaterialsA370 Test Methods and Definitions for Mechanical Testingof Steel
15、Products1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.05 on Steel Reinforcement.Current edition approved Sept. 15, 2016. Published September 2016. Originallyapproved in 1996. Last pr
16、evious edition approved in 2016 as A955/A955M 16.DOI: 10.1520/A0955_A0955M-16A.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page o
17、nthe ASTM website.*A Summary 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 States1TABLE1DeformedBarDesignationNumbers,NominalWeightsMasses,NominalDimensions,andDeformationRequirementsBa
18、rDesignationNo.NominalWeight,lb/ftNominalMass,kg/mANominalDimensionsBDeformationRequirements,in.mm400Series;DuplexAlloys300SeriesDiameter,in.mmCross-Sectional Area,in.2mm2Perimeter,in.mmMaximumAverageSpacingMinimumAverageHeightMaximumGapperSideCTwo-SidedBarThree-SidedBar3100.3740.5560.3780.5620.3759
19、.50.11711.17829.90.2626.70.0150.380.1433.60.0972.54130.6791.0110.6861.0210.50012.70.201291.57139.90.3508.90.0200.510.1914.90.1293.35161.0481.5591.0581.5750.62515.90.311991.96349.90.43711.10.0280.710.2396.10.1624.16191.4952.2251.5112.2480.75019.10.442842.35659.80.52513.30.0380.970.2867.30.1944.97222.
20、0383.0322.0593.0640.87522.20.603672.74969.80.61215.50.0441.120.3348.50.2265.88252.6853.9952.7134.0371.00025.40.795103.14279.80.70017.80.0501.270.3839.70.2596.69293.3965.0533.4415.1061.12828.71.006453.54490.00.79020.10.0561.420.43110.90.2927.410324.3126.4164.3586.4841.27032.31.278193.990101.30.88922.
21、60.0641.630.48712.40.3298.311365.2967.8805.3527.9641.41035.81.5610064.430112.50.98725.10.0711.800.54013.70.3659.314437.6411.377.7211.491.69343.02.2514525.32135.11.18530.10.0852.160.64816.50.43811.1185713.5920.2213.7220.432.25757.34.0025817.09180.11.5840.10.1022.590.86421.90.58414.8AThe400andDuplex-A
22、lloySeriesisbasedonadensityof489.59lb/ft37833.4kg/m3.The300Seriesisbasedonadensityof494.78lb/ft37916.5kg/m3.Densityvarieswithalloycontentwhichmayresultinavariationofseveralpercent.BThenominaldimensionsofadeformedbarareequivalenttothoseofaroundbarhavingthesameweightmassperfootmetreasthedeformedbar.CT
23、hemaximumgap(measuredasachord)betweentheendsofthedeformationsshallnotexceed25%nofthenominalperimeterofthebar,wherenisthenumberoflongitudinalgapsorlongitudinalribsaroundtheperimeterofthebar.A955/A955M 16a2A510 Specification for General Requirements for Wire Rodsand Coarse Round Wire, Carbon SteelA510
24、M Specification for General Requirements for WireRods and Coarse Round Wire, Carbon Steel (Metric)(Withdrawn 2011)3A751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsC192/C192M Practice for Making and Curing Concrete TestSpecimens in the LaboratoryE29 Practice for
25、Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE290 Test Methods for Bend Testing of Material for Ductil-ityG15 Terminology Relating to Corrosion and Corrosion Test-ing (Withdrawn 2010)32.2 U.S. Military Standard:4MIL-STD-129 Marking for Shipment and Storage2.3 U.S.
26、 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 de-formed bar.3.1.2 deformed bar, nsteel bar with protrusions; a bar thatis intended for use as reinforceme
27、nt in reinforced concreteconstruction.3.1.2.1 DiscussionThe surface of the bar is provided withprotrusions that inhibit longitudinal movement of the barrelative to the concrete surrounding the bar in such construc-tion. The protrusions conform to the provisions of this speci-fication.3.1.3 plain bar
28、, nsteel bar without protrusions.3.1.4 relative deformation area, nthe ratio of the defor-mation bearing area (projected deformation area normal to thebar axis) to the shearing area (nominal bar perimeter times theaverage spacing of the deformations.3.1.5 rib, nlongitudinal protrusion on a deformed
29、bar.3.1.6 stainless steel, na steel that contains 11 % or morechromium.3.1.7 three-sided bar, ndeformed steel bar with three rowsof transverse deformations.3.1.8 two-sided bar, ndeformed steel bar with two rows oftransverse deformations.4. Ordering Information4.1 It shall be the responsibility of th
30、e purchaser to specifyall requirements that are necessary for material ordered to thisspecification. Such requirements shall include but are notlimited to the following:4.1.1 Quantity (weight) mass,4.1.2 Name of material (deformed and plain stainless steelbars for concrete reinforcement),4.1.3 Chemi
31、cal 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 require
32、ment (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 ofmold or strand cast steel.5.2 Bars shall be furnished in one of the following heattreatment conditions, as shown in Specification A276, and asneed
33、ed 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 heattreat condition of the material. Any further heat treatment of the materialmay alter those properties and affect th
34、eir ability to meet the specifiedstrength level. No re-treatment should be imposed without retesting to therequirements of this specification.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Sect
35、ion D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.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-
36、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 18.00-20.008.00-10.500.10S31603 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 16.00-18.0010.00-14.002.00-3.0
37、0 0.10-0.16S31803 0.03 2.00 0.030 0.020 1.00 21.00-23.004.50-6.502.50-3.50 0.08-0.20AMaximum, unless otherwise indicated.A955/A955M 16a36. Chemical Composition6.1 The chemical analysis of each heat of steel shall bedetermined in accordance with Test Methods, Practices, andTerminology A751. The manuf
38、acturer shall make the analysison test samples taken preferably during the pouring of the heat.6.2 The chemical composition agreed to between manufac-turer and purchaser shall conform to the requirements in Table1 of Specification A276.7. Requirements for Deformations7.1 Deformations shall be spaced
39、 along the bar at substan-tially uniform distances. The deformations on all sides of thebar shall be similar in size, shape, and pattern.7.2 The deformations shall be placed with respect to the axisof the bar so that the included angle is not less than 45. Wherethe line of deformations forms an incl
40、uded angle with the axisof the bar of from 45 to 70 inclusive, the deformations on atwo-sided bar shall alternately reverse in direction on each sideor those on one side shall be reversed in direction from thoseon the opposite side. The deformations on three-sided barsshall reverse on one of the thr
41、ee sides (see Fig. 1). Where theline of deformation is over 70, a reversal in direction is notrequired.7.3 The average spacing or distance between deformationson each side of the bar shall not exceed seven tenths of thenominal diameter of the bar.7.4 The overall length of deformations shall be such
42、that thegap (measured as a chord) between the ends of the deforma-tions shall not exceed 25 % n, where n is the number oflongitudinal gaps or longitudinal ribs, of the nominal perimeterof the bar. Where the ends of the deformations terminate in alongitudinal rib, the width of the longitudinal rib sh
43、all beconsidered as the gap between these ends. The summation ofthe gaps shall not exceed 25 % of the nominal perimeter of thebar. The nominal perimeter of the bar shall be 3.1416 times thenominal diameter.7.5 The spacing, height, and gap of deformations shallconform to the requirements prescribed i
44、n Table 1.8. Measurement of Deformations8.1 The average spacing of deformations shall be deter-mined by measuring the length of a minimum of ten spaces anddividing that length by the number of spaces included in themeasurement. The measurement shall begin from a point on adeformation at the beginnin
45、g of the first space to a correspond-ing point on a deformation after the last included space.Spacing measurements shall not be made over a bar areacontaining bar marking symbols.8.2 The average height of deformations shall be determinedfrom measurements made on not less than two typical defor-matio
46、ns. Determinations shall be based on three measurementsper deformation, one at the center of the overall length and theother two at the quarter points of the overall length.8.3 For three-sided bars, the relative deformation area, Rd,shall meet the requirements of Annex A4.8.4 Insufficient height, in
47、sufficient circumferentialcoverage, or excessive spacing of deformations shall notconstitute cause for rejection unless it has been clearly estab-lished by determinations on each lot (Note 4) tested that typicaldeformation height, gap, or spacing does not conform to theminimum requirements prescribe
48、d in Section 7. No rejectionshall be made on the basis of measurements if fewer than tenadjacent deformations on each side of the bar are measured.NOTE 4A lot, for this purpose, is defined as all the bars of one barnumber and pattern of deformation contained in an individual shippingrelease or shipp
49、ing order.9. Tensile Requirements9.1 The material, as represented by the test specimens, shallconform to the requirements for tensile properties prescribed inTable 3.9.2 The yield strength shall be determined by the offsetmethod (0.2 % offset), as described in Test Methods andDefinitions A370.9.3 When material
