1、Designation: A 955/A 955M 09Standard Specification forDeformed and Plain Stainless-Steel Bars for ConcreteReinforcement1This standard is issued under the fixed designationA 955/A 955M; 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 used in ap
3、plicationsrequiring resistance to corrosion or controlled magnetic per-meability. The standard sizes and dimensions of deformed barsand their numerical designation shall be those listed in Table 1.The text of this specification references notes and footnoteswhich provide explanatory material. These
4、notes and footnotes(excluding those in tables and figures) shall not be consideredas 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 magnetic permeability prod
5、uct,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 consideration in achieving the desi
6、red 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 withthe manufacturer for stain
7、less 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 including 2 in. 50.8 mmin diamet
8、er, when specified for dowels, spirals, structural ties,and supports, shall be furnished under this specification inGrade 40 280, Grade 60 420, and Grade 75 520, respec-tively. Bending properties, when required, shall be by agree-ment between the manufacturer and purchaser. Requirementsproviding for
9、 deformations and marking shall not be applicableto 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 intende
10、duse 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 Inst
11、itute (NIDI)(Toronto, Canada).1.6 This specification is applicable for orders in eitherinch-pound units (as Specification A 955) or in SI units (asSpecification A 955M).1.7 The values stated in either inch-pound or SI units are tobe regarded separately as standard. Within the text, the SI unitsare s
12、hown 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.1.8 This standard does not purport to address all of thesafety concerns,
13、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:2A 6/A 6M Specification for General Requiremen
14、ts forRolled Structural Steel Bars, Plates, Shapes, and SheetPilingA 276 Specification for Stainless Steel Bars and ShapesA 342/A 342M Test Methods for Permeability of FeeblyMagnetic MaterialsA 370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA 484/A 484M Specification for Gen
15、eral Requirements forStainless Steel Bars, Billets, and Forgings1This 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 May 1, 2009. Publishe
16、d May 2009. Originallyapproved in 1996. Last previous edition approved in 2007 as A 995/A 955M 07a.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 Doc
17、ument 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.A 510 Specification for General Requirements for WireRods and Coarse Round Wire,
18、Carbon SteelA 700 Practices for Packaging, Marking, and LoadingMethods for Steel Products for ShipmentC 192/C 192M Practice for Making and Curing ConcreteTest Specimens in the LaboratoryE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsG15 Terminology
19、Relating to Corrosion and CorrosionTesting2.2 U.S. Military Standard:3MIL-STD-129 Marking for Shipment and Storage2.3 U.S. Federal Standard:3Fed. Std. No. 123 Marking for Shipment (Civil Agencies)3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 deformations, ntransverse protrus
20、ions 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 to the concret
21、e 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 rib, nlongitudinal protrusion on a deformed bar.3.1.5 stainless steel, na steel that contains 11 % or morechromium.4. Ordering Infor
22、mation4.1 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 the following:4.1.1 Quantity (weight) mass,4.1.2 Name of material (deformed and plain stainless ste
23、elbars for concrete reinforcement),4.1.3 Chemical composition (stainless steel alloy),4.1.4 Heat treatment condition,4.1.5 Size,3Available 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 B
24、ar Designation 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.mmMax
25、imumAverage 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
26、15.9 0.31 199 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.
27、700 17.8 0.050 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
28、0.540 13.714 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/in.37833.4 kg/m3. The 300 Series is b
29、ased on a density 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 Require
30、ments 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 17.00-19.002.25-3.750.20-0.40S24100 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
31、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 0.03 2.00 0.045 0.020 1.00 21.00-23.004.50-6.502.50-3.50 0.08-0.20AMaximum, unless oth
32、erwise indicated.A 955/A 955M 0924.1.6 Length,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 Manufacture5.1 The bars
33、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 A 276, and asneeded to meet the requirements of this specification.5.2.1 Annealed (A).5.2.2 Hot rolled (HR).5.2.3 Strain
34、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 retesting to
35、therequirements of this specification.6. Chemical Composition6.1 An analysis of each heat of steel shall be made by themanufacturer from test samples taken during the pouring orcasting of the steel. Such analysis shall meet the chemicalcomposition requirements specified in Table 2 by the pur-chaser.
36、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 SpecificationA 484/A 484M.6.3 An analysis made by the purchaser from the finishedproduct shall meet the specification tolerances of Spe
37、cificationA 484/A 484M.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 similar in size, shape, and pattern.7.2 The deformations shall be placed with respect to the axisof the bar
38、 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 reverse in direction on each side or those on oneside shall be reversed in direction from those on the opposite
39、side. 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 tenths of thenominal diameter of the bar.7.4 The overall length of deformations shall be such that thegap (mea
40、sured 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 the gap between these ends. The summationof the gaps shall not exceed 25 % of the nominal perimeter ofthe
41、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, height, and gap of deformations shallconform to the requirements prescribed in Table 1.8. Measurement of Deform
42、ations8.1 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 beginning of the first space to a correspo
43、nd-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-mations. Determinations shall be based
44、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 cover-age, or excessive spacing of deformations shall not constitutecause for rejection unless it has been
45、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 rejectionshall be made on the basis of measurements if fewer than tenadjacent deformations on each side of the ba
46、r 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 Requirements9.1 The material, as represented by the test specimens, shallconform to the requirements for tensil
47、e properties prescribed inTable 3 or by agreement between the manufacturer and thepurchaser.9.2 The yield strength shall be determined by the offsetmethod (0.2 % offset), as described in Test Methods andDefinitions A 370 (paragraph 13.2.1).9.3 The percentage of elongation shall be as prescribed inTa
48、ble 3. When the actual percentage of elongation meets orexceeds 25 % of the bending requirements in Section 10 shallbe waived.TABLE 3 Tensile RequirementsNOTE 1Check with producer for availability of grades and sizes.Grade 40 280 Grade 60 420 Grade 75 520Tensile strength, min, psi MPa 70 000 500 90
49、000 620 100 000 690Yield strength, min, psi MPa 40 000 280 60 000 420 75 000 520Elongation in 8 in. 200 mm,min, %Bar designation no.3, 4, 5 10, 13, 16 20 206 19 20 20 207, 8, 9, 10, 11, 14, 1822, 25, 29, 32, 36, 43,5720 20A 955/A 955M 09310. Bending Requirements10.1 The bend test specimen shall withs
