1、Designation: A955/A955M 10aStandard 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 Bars are of three minimum yield strength levels, namely,40 000 280 MPa, 60 000 420 MPa, and 75 000 psi 520MPa, designated as Grade 40 280, Grade 60 420, andGrade 75 520, respectively.1.4 Plain rounds in sizes up to and includi
8、ng 2 in. 50.8 mmin diameter in coils or cut lengths, when ordered, shall befurnished under this specification in Grade 40 280, Grade 60420, and Grade 75 520, respectively. Bending properties,when required, shall be by agreement between the manufac-turer and purchaser. Requirements providing for defo
9、rmationsand marking shall not be applicable to plain bars.1.5 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 suitable for the chemical composition and intendeduse
10、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 forinformation available from the Nickel Development Institute
11、 (NIDI)(Toronto, Canada).1.6 This specification is applicable for orders in eitherinch-pound units (as Specification A955) or in SI units (asSpecification A955M).1.7 The values stated in either inch-pound or SI units are tobe regarded separately as standard. Within the text, the SI unitsare shown in
12、 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.1.8 This standard does not purport to address all of thesafety concerns, if any,
13、 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:2A6/A6M Specification for General Requirements for Ro
14、lledStructural Steel Bars, Plates, Shapes, and Sheet PilingA276 Specification for Stainless Steel Bars and ShapesA342/A342M Test Methods for Permeability of FeeblyMagnetic MaterialsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA484/A484M Specification for General Requireme
15、nts forStainless Steel Bars, Billets, and ForgingsA510 Specification for General Requirements for Wire1This 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
16、edition approved Oct. 1, 2010. Published November 2010. Originallyapproved in 1996. Last previous edition approved in 2010 as A955/A955M 10.DOI: 10.1520/A0955_A0955M-10A.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annu
17、al Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*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.Rods and C
18、oarse Round Wire, Carbon SteelA510M Specification for General Requirements for WireRods and Coarse Round Wire, Carbon Steel (Metric)A700 Practices for Packaging, Marking, and Loading Meth-ods for Steel Products for ShipmentA751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel
19、 ProductsC192/C192M Practice for Making and Curing ConcreteTest Specimens in the LaboratoryE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsG15 Terminology Relating to Corrosion and CorrosionTesting32.2 U.S. Military Standard:4MIL-STD-129 Marking for
20、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 Standard:3.1.1 deformations, ntransverse protrusions on a de-formed bar.3.1.2 deformed bar, nsteel bar with protrusions; a bar thatis intended
21、 for use as reinforcement in reinforced concreteconstruction.3.1.2.1 DiscussionThe surface of the bar is provided withlugs or protrusions that inhibit longitudinal movement of thebar relative to the concrete surrounding the bar in suchconstruction. The lugs or protrusions conform to the provisionsof
22、 this specification.3.1.3 plain bar, nsteel bar without protrusions.3.1.4 rib, nlongitudinal protrusion on a deformed bar.3.1.5 stainless steel, na steel that contains 11 % or morechromium.4. Ordering Information4.1 It shall be the responsibility of the purchaser to specifyall requirements that are
23、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 Chemical composition (stainless steel alloy),4.1.4 He
24、at treatment condition,3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.4Available from Standardization Documents Order Desk, DODSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.TABLE 1 Deformed Bar Designa
25、tion Numbers, Nominal Weights Masses, Nominal Dimensions, and Deformation RequirementsBarDesignationNo.Nominal Weight, lb/ft NominalMass, kg/mANominal DimensionsBDeformation Requirements, in. mm400 Series;Duplex Alloys300 SeriesDiameter, in.mmCross-SectionalArea, in.2mm2Perimeter, in.mmMaximumAverag
26、e SpacingMinimumAverage HeightMaximum Gap(Chord of 12.5 %of NominalPerimeter)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 3.64 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 4.95 16 1.048 1.559 1.058 1.575 0.625 15.9 0.31
27、199 1.963 49.9 0.437 11.1 0.028 0.71 0.239 6.16 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 7.37 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 8.58 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
28、.050 1.27 0.383 9.79 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 10.910 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 12.411 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
29、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 16.518 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 21.9AThe 400 and Duplex-Alloy Series is based on a density of 489.59 lb/ft37833.4 kg/m3. The 300 Series is based on a d
30、ensity of 494.78 lb/ft37916.5 kg/m3. Densityvaries with alloy content which may result in a variation of several percent.BThe 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.TABLE 2 Chemical Requirements of Ty
31、pical AlloysAUNSDesignationComposition %Type Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Molybdenum NitrogenS24000 XM-29 0.08 11.50-14.500.060 0.030 1.00 17.00-19.002.25-3.750.20-0.40S24100 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
32、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 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 indi
33、cated.A955/A955M 10a24.1.5 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 Packaging (see Section 24),4.1.11 Supplementary requirement (if desired), and4.1.12 ASTM designation and year of issue.5. Materials and Manufacture
34、5.1 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 asneeded to meet the requirements of this specification.5.2.1 Annealed (A).5.2.2 Hot rolled (HR).5
35、.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 their ability to meet the specifiedstrength level. No re-treatment should be imposed without r
36、etesting to therequirements of this specification.6. Chemical Composition6.1 The chemical analysis of each heat of steel shall bedetermined in accordance with Test Methods, Practices, andTerminology A751. The manufacturer shall make the analysison test samples taken preferably during the pouring of
37、the heat.Such analysis shall meet the chemical composition require-ments specified in Table 2 by the purchaser.6.2 When specified by the purchaser, an analysis of theproduct shall be made by the manufacturer and shall conformto the analysis tolerances specified in Table 1 of SpecificationA484/A484M.
38、6.3 An analysis made by the purchaser from the finishedproduct shall meet the specification tolerances of SpecificationA484/A484M.7. Requirements for Deformations7.1 Deformations shall be spaced along the bar at substan-tially uniform distances. The deformations on opposite sides ofthe bar shall be
39、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 included angle with the axisof the bar of from 45 to 70 inclusive, the deformations shallalternately reve
40、rse in direction on each side or those on oneside shall be reversed in direction from those on the oppositeside. Where the line of deformation is over 70, a reversal indirection is not required.7.3 The average spacing or distance between deformationson each side of the bar shall not exceed seven ten
41、ths of thenominal diameter of the bar.7.4 The overall length of deformations shall be such that thegap (measured as a chord) between the ends of the deforma-tions shall not exceed 1212 % of the nominal perimeter of thebar. Where the ends terminate in a rib, the width of the rib shallbe considered as
42、 the gap between these ends. The summationof the gaps shall not exceed 25 % of the nominal perimeter ofthe bar. Furthermore, the summation of gaps shall not exceed25 % of the nominal perimeter of the bar. The nominalperimeter of the bar shall be 3.1416 times the nominaldiameter.7.5 The spacing, heig
43、ht, and gap of deformations shallconform to the requirements prescribed in 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.
44、 The measurement shall begin from a point on adeformation at the beginning 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
45、determinedfrom measurements made on not less than two typical defor-mations. 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 Insufficient height, insufficient circumferential
46、cover-age, or excessive spacing of deformations shall not constitutecause for rejection unless it has been clearly established bydeterminations on each lot (Note 4) tested that typical defor-mation height, gap, or spacing does not conform to theminimum requirements prescribed in Section 7. No reject
47、ionshall 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 shipping order.9. Tensile Requ
48、irements9.1 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. A second tensile test result s
49、hall also berequired. In addition, the stress corresponding to a tensile strainof 0.0035 shall be a minimum of 60 000 psi 420 MPa forGrade 60 420 and a minimum of 75 000 psi 520 MPa forGrade 75 520. The value of stress corresponding to a tensilestrain of 0.0035 shall be reported in the test report (19.1.5).TABLE 3 Tensile Re
