1、Designation: A955/A955M 111Standard 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 the Summary of Changes in October 2011.1. Scope*1.1 This specification covers
3、deformed and plain 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.
4、 The text of this 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 sha
5、ll apply only when 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 byagree
6、ment between the 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 i
7、n NorthAmerica. 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 three minimum yield strength
8、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.1.5 Plain rounds 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 Gr
9、ade 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 deformationsand marking shall not be applicable to plain bars.1.6 Weldability of most stainless steel compositions isge
10、nerally 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 or service shall be used. Retesting of physical propertiesshould be considered following welding procedures dependi
11、ngupon the steel composition and welding operation involved.NOTE 2It 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 Specificatio
12、n A955) or in SI units (asSpecification A955M).1.8 The values stated 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-pen
13、dently of the other. Combining values from the two systemsmay result 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
14、 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 RolledStructural Steel Bars, Plates, Shapes, and Sheet PilingA276 Specification for Stainless Steel Bars and Shapes1T
15、his 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 April 1, 2011. Published May 2011. Originallyapproved in 1996. Last previous edition ap
16、proved in 2010 as A955/A955M 10a.DOI: 10.1520/A0955_A0955M-11E01.2For 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 webs
17、ite.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.TABLE 1 Deformed Bar Designation Numbers, Nominal Weights Masses, Nominal Dimensions, and Deformation RequirementsB
18、arDesignationNo.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 0.374
19、 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 3.3
21、96 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 3
23、00 Series is based on a density of 494.78 lb/ft37916.5 kg/m3. Density varies with alloy content which may result in avariation 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.CThe maxim
24、um 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 aroundthe perimeter of the bar.A955/A955M1112A342/A342M Test Methods for Permeability of FeeblyMagnetic Mater
25、ialsA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA510 Specification for General Requirements for WireRods and Coarse Round Wire, Carbon SteelA510M Specification for General Requirements for WireRods and Coarse Round Wire, Carbon Steel (Metric)A700 Practices for Packaging,
26、 Marking, and Loading Meth-ods for Steel Products for ShipmentA751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsC192/C192M Practice for Making and Curing ConcreteTest Specimens in the LaboratoryE29 Practice for Using Significant Digits in Test Data toDetermine Con
27、formance with SpecificationsG15 Terminology Relating to Corrosion and CorrosionTesting32.2 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 Sta
28、ndard: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 reinforcement in reinforced concreteconstruction.3.1.2.1 DiscussionThe surface of the bar is provided withlugs or protrusions that inhibit longitudin
29、al movement of thebar relative 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 defor
30、mation 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 bar.3.1.6 stainless steel, na steel that contains 11 % or morechromium.3.1.7 three-sided bar, ndeformed steel bar with threero
31、ws of transverse deformations.3.1.8 two-sided bar, ndeformed steel bar with two rowsof transverse 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 i
32、nclude 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 Heat treatment condition,4.1.5 Size,4.1.6 Cut lengths or coils,4.1.7 Deformed or
33、 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 shall be rolled from properly identified heats ofmold or strand
34、 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).5.2.3 Strain hardened (B).NOTE 3The mechanical properties of the material res
35、ult 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 therequirements of this specification.3Withdrawn. The last appro
36、ved 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 2 Chemical Requirements of Typical AlloysAUNSDesignationComposition %Ty
37、pe 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 0.030 1.00 18.00-20.008.00-10.500.10S31603
38、 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 indicated.A955/A955M 11136. Chemical Compositi
39、on6.1 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 the heat.6.2 The chemical composition agreed to between manufac-turer a
40、nd purchaser shall conform to the requirements 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
41、 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 on atwo-sided bar shall alternately reverse in direction on each sideor those
42、 on one side shall be reversed in direction 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 deformatio
43、nson 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 (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 ri
44、bs, of the nominal perimeterof the bar. Where 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 t
45、he bar shall be 3.1416 times thenominal diameter.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 anddi
46、viding 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 correspond-ing point on a deformation after the last included space.Spacing measurements shall not be made over a bar areacontainin
47、g 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 on three measurementsper deformation, one at the center of the overall length and theother two at the quarter points of the
48、 overall length.8.3 For three-sided bars, the relative deformation area, Rd,shall meet the requirements of Annex A4.8.4 Insufficient height, insufficient circumferential cover-age, or excessive spacing of deformations shall not constitutecause for rejection unless it has been clearly established byd
49、eterminations 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 bar are measured.NOTE 4A lot,
