1、Designation: A955/A955M 121Standard 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.1NOTEEditorial corrections were made to 23.3.4 in November 2012.1. Scope*1.1 This specification covers deformed and pl
3、ain stainless-steel bars for concrete reinforcement in cut lengths 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 th
4、is specification referencesnotes and footnotes which provide explanatory 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 w
5、hen specified by the 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 alloyshall be selected for suitability to the application involved byagreement between th
6、e manufacturer and the purchaser. This isan important consideration 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.
7、 Other alloys may also provide desired properties; consult withthe 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
8、 000 420 MPa and 75 000 psi 520 MPa, designated asGrade 60 420 and 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
9、properties, when required,shall be by agreement between the manufacturer 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, ar
10、e necessary. Where material is to be welded, a weldingprocedure 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 2I
11、t is recommended that the user consult the manufacturer forinformation 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 state
12、d in either inch-pound or SI units are tobe regarded separately 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 resul
13、t in nonconformance with the standard.1.9 This standard does not 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 li
14、mitations prior to use.2. Referenced Documents2.1 ASTM Standards: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 FeeblyMagnetic Materials1
15、This 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 March 1, 2012. Published April 2012. Originallyapproved in 1996. Last previous edition
16、 approved in 2011 as A955/A955M 111.DOI: 10.1520/A0955_A0955M-12E01.2For 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 onthe ASTM w
17、ebsite.*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 States1TABLE 1 Deformed Bar Designation Numbers, Nominal Weights Masses, Nominal Dimensions, and Deformation Requirements
18、BarDesignationNo.Nominal Weight, lb/ft Nominal Mass,kg/mANominal DimensionsBDeformation Requirements, in. mm400 Series;Duplex Alloys300 SeriesDiameter, in.mmCross-SectionalArea, in.2mm2Perimeter, in.mmMaximumAverage SpacingMinimumAverage HeightMaximum Gap per SideCTwo-SidedBarThree-SidedBar3 10 0.37
19、4 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 2.54 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
20、 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 4.97 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.
21、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 7.410 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
22、 9.314 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 11.118 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 14.8AThe 400 and Duplex-Alloy Series is based on a density of 489.59 lb/ft37833.4 kg/m3. The
23、300 Series is based on a density of 494.78 lb/ft37916.5 kg/m3. Density varies with alloy content which may result in a variationof 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.CThe maxi
24、mum 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 theperimeter of the bar.A955/A955M1212A370 Test Methods and Definitions for Mechanical Testingof Stee
25、l ProductsA510 Specification for General Requirements for Wire Rodsand Coarse Round Wire, Carbon SteelA510M Specification for General Requirements for WireRods and Coarse Round Wire, Carbon Steel (Metric)(Withdrawn 2011)3A700 Practices for Packaging, Marking, and Loading Meth-ods for Steel Products
26、for ShipmentA751 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 Using Significant Digits in Test Data toDetermine Conformance with SpecificationsG15 Terminology Relati
27、ng 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. 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, ntran
28、sverse protrusions on a de-formed bar.3.1.2 deformed bar, nsteel bar with protrusions; a bar thatis intended 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
29、to the concrete surrounding the bar in suchconstruction. The lugs or protrusions conform to the provisionsof this specification.3.1.3 plain bar, nsteel bar without protrusions.3.1.4 relative deformation area, nthe ratio of the defor-mation bearing area (projected deformation area normal to thebar ax
30、is) to the shearing area (nominal bar perimeter times theaverage spacing of the deformations.3.1.5 rib, nlongitudinal protrusion on a deformed 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
31、.1.8 two-sided bar, ndeformed steel bar with two rows oftransverse deformations.4. Ordering Information4.1 It shall be the responsibility of the purchaser to specifyall requirements that are necessary for material ordered to thisspecification. Such requirements shall include but are notlimited to th
32、e 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 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 le
33、vel),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 Manufacture5.1 The bars shall be rolled from properly identified heats ofmold or strand cast steel.5.2 Bars shall be f
34、urnished 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).5.2.3 Strain hardened (B).3The last approved version of this historical standard is referenced onwww.astm.or
35、g.4Available 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 AlloysAUNSDesignationComposition %Type Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Molyb
36、denum 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 18.00-20.008.00-10.500.10S31603 316L 0.03 2.00 0.045 0.030 1.00 16.00-18.0010.00-14.002.00-3.00 0.
37、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 indicated.A955/A955M 1213NOTE 3The mechanical properties of the material result from the heattreat condition of t
38、he 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 retesting to therequirements of this specification.6. Chemical Composition6.1 The chemical analysis of each heat o
39、f 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 the heat.6.2 The chemical composition agreed to between manufac-turer and purchaser shall conform to the requirem
40、ents in Table1 of Specification A276.7. Requirements for Deformations7.1 Deformations shall be spaced 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 axiso
41、f 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 on atwo-sided bar shall alternately reverse in direction on each sideor those on one side shall be reversed in directio
42、n from thoseon the opposite side. The deformations on three-sided barsshall reverse on one of the three 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
43、 seven tenths 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 25 %/n, where n is the number oflongitudinal gaps or longitudinal ribs, of the nominal perimeterof the bar. Wh
44、ere the ends of the deformations terminate in alongitudinal rib, the width of the longitudinal rib shall 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 di
45、ameter.7.5 The spacing, height, 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
46、 included in themeasurement. 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 heig
47、ht of deformations shall be 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 For three-sided bars,
48、the relative deformation area, Rd,shall meet the requirements of Annex A4.8.4 Insufficient height, insufficient 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
49、that typicaldeformation height, gap, or spacing does not conform to theminimum requirements prescribed 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
