1、Designation:A955/A955M111Designation: A955/A955M 12Standard 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, i
2、n the case of revision, 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*1.1Thi
3、s1.1 This specification covers deformed and plain stainless-steel bars for concrete reinforcement in cut lengths and coilsused in applications requiring resistance to corrosion or controlled magnetic permeability. The standard sizes and dimensions ofdeformed bars and their numerical designation shal
4、l be those listed in Table 1. The text of this specification references notes andfootnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not beconsidered as requirements of the specification.1.1.1 Supplementary requirement (S1) of an opti
5、onal nature is provided. It shall 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 alloy shall be selected for suitability to
6、 the application involved byagreement between the manufacturer and the purchaser. This is an important consideration in achieving the desired corrosionresistance or controlled magnetic permeability, or both, because these properties are not provided by all stainless steels.NOTE 1The alloys shown in
7、Table 2 have found the most use in North America. Other alloys may also provide desired properties; consult with themanufacturer 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 ar
8、e of threetwo minimum yield strength levels, namely, 40 000 280 MPa, 60 000 420 MPa,MPa and 75 000 psi520 MPa, designated as Grade 40 280, Grade 60 420,420 and Grade 75 520, respectively.1.5Plain rounds1.5 Plain bars in sizes up to and including 2 in. 50.8 mm in diameter in coils or cut lengths, whe
9、n ordered,shall be furnished under this specification in Grade 40 280, Grade 60 420,420 and Grade 75 520, respectively. Bendingproperties, when required, shall be by agreement between the manufacturer and purchaser. Requirements providing fordeformations and marking shall not be applicable to plain
10、bars.1.6 Weldability of most stainless steel compositions is generally good, however, pre-weld or post-weld procedures, or both, arenecessary. Where material is to be welded, a welding procedure suitable for the chemical composition and intended use or serviceshall be used. Retesting of physical pro
11、perties should be considered following welding procedures depending upon the steelcomposition and welding operation involved.NOTE 2It is recommended that the user consult the manufacturer for information available from the Nickel Development Institute (NIDI) (Toronto,Canada).1.7 This specification i
12、s applicable for orders in either inch-pound units (as Specification A955) or in SI units (as SpecificationA955M).1.8 The values stated in either inch-pound or SI units are to be regarded separately as standard. Within the text, the SI units areshown in brackets. The values stated in each system are
13、 not exact equivalents; therefore, each system shall be used independentlyof the other. Combining values from the two systems may result in nonconformance with the standard.1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibi
14、lityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.1This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel and Related Alloys and is the direct responsibilit
15、y of Subcommittee A01.05on Steel Reinforcement.Current edition approved April 1, 2011. Published May 2011. Originally approved in 1996. Last previous edition approved in 2010 as A955/A955M10a. DOI:10.1520/A0955_A0955M-11E01.Current edition approved March 1, 2012. Published April 2012. Originally app
16、roved in 1996. Last previous edition approved in 2011 as A955/A955M 111. DOI:10.1520/A0955_A0955M-12.1This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technica
17、lly possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this sta
18、ndard.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.2. Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet PilingA276 Specification for St
19、ainless Steel Bars and ShapesA342/A342M Test Methods for Permeability of Feebly Magnetic MaterialsA370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA510 Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon SteelA510M Specification for General Req
20、uirements for Wire Rods and Coarse Round Wire, Carbon Steel (Metric)A700 Practices for Packaging, Marking, and Loading Methods for Steel Products for ShipmentA751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel ProductsC192/C192M Practice for Making and Curing Concrete Test S
21、pecimens in the LaboratoryE29 Practice for Using Significant Digits in Test Data to Determine Conformance with SpecificationsG15 Terminology Relating to Corrosion and Corrosion Testing2.2 U.S. Military Standard:3MIL-STD-129 Marking for Shipment and Storage2.3 U.S. Federal Standard:3Fed. Std. No. 123
22、 Marking for Shipment (Civil Agencies)3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 deformations, ntransverse protrusions on a deformed bar.3.1.2 deformed bar, nsteel bar with protrusions; a bar that is intended for use as reinforcement in reinforced concreteconstruction.3.1
23、.2.1 DiscussionThe surface of the bar is provided with lugs or protrusions that inhibit longitudinal movement of the barrelative to the concrete surrounding the bar in such construction. The lugs or protrusions conform to the provisions of thisspecification.3.1.3 plain bar, nsteel bar without protru
24、sions.3.1.4 relative deformation area, nthe ratio of the deformation bearing area (projected deformation area normal to the bar axis)to the shearing area (nominal bar perimeter times the average spacing of the deformations.3.1.5 rib, nlongitudinal protrusion on a deformed bar.3.1.6 stainless steel,
25、na steel that contains 11 % or more chromium.3.1.7 three-sided bar, ndeformed steel bar with three rows of transverse deformations.3.1.8 two-sided bar, ndeformed steel bar with two rows of transverse deformations.4. Ordering Information4.1 It shall be the responsibility of the purchaser to specify a
26、ll requirements that are necessary for material ordered to thisspecification. Such requirements shall include but are not limited to the following:4.1.1 Quantity (weight) mass,4.1.2 Name of material (deformed and plain stainless steel bars for concrete reinforcement),4.1.3 Chemical composition (stai
27、nless steel alloy),4.1.4 Heat treatment condition,4.1.5 Size,4.1.6Cut lengths or coils,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 des
28、ignation and year of issue.5. Materials and Manufacture5.1 The bars shall be rolled from properly identified heats of mold or strand cast steel.5.2 Bars shall be furnished in one of the following heat treatment conditions, as shown in Specification A276, and as neededto meet the requirements of this
29、 specification.2For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3Available from Standardization Documents Or
30、der Desk, DODSSP, Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http:/www.dodssp.daps.mil.A955/A955M 122TABLE1DeformedBarDesignationNumbers,NominalWeightsMasses,NominalDimensions,andDeformationRequirementsBarDesignationNo.NominalWeight,lb/ftNominalMass,kg/mANominalDimensionsBDef
31、ormationRequirements,in.mm400Series;DuplexAlloys300SeriesDiameter,in.mmCross-Sectional Area,in.2mm2Perimeter,in.mmMaximumAverageSpacingMinimumAverageHeightMaximumGapperSideCTwo-SidedBarThree-SidedBar3100.3740.5560.3780.5620.3759.50.11711.17829.90.2626.70.0150.380.1433.60.0972.54130.6791.0110.6861.02
32、10.50012.70.201291.57139.90.3508.90.0200.510.1914.90.1293.35161.0481.5591.0581.5750.62515.90.311991.96349.90.43711.10.0280.710.2396.10.1624.16191.4952.2251.5112.2480.75019.10.442842.35659.80.52513.30.0380.970.2867.30.1944.97222.0383.0322.0593.0640.87522.20.603672.74969.80.61215.50.0441.120.3348.50.2
33、265.88252.6853.9952.7134.0371.00025.40.795103.14279.80.70017.80.0501.270.3839.70.2596.69293.3965.0533.4415.1061.12828.71.006453.54490.00.79020.10.0561.420.43110.90.2927.410324.3126.4164.3586.4841.27032.31.278193.990101.30.88922.60.0641.630.48712.40.3298.311365.2967.8805.3527.9641.41035.81.5610064.43
34、0112.50.98725.10.0711.800.54013.70.3659.314437.6411.377.7211.491.69343.02.2514525.32135.11.18530.10.0852.160.64816.50.43811.1185713.5920.2213.7220.432.25757.34.0025817.09180.11.5840.10.1022.590.86421.90.58414.8AThe400andDuplex-AlloySeriesisbasedonadensityof489.59lb/ft37833.4kg/m3.The300Seriesisbased
35、onadensityof494.78lb/ft37916.5kg/m3.Densityvarieswithalloycontentwhichmayresultinavariationofseveralpercent.BThenominaldimensionsofadeformedbarareequivalenttothoseofaroundbarhavingthesameweightmassperfootmetreasthedeformedbar.CThemaximumgap(measuredasachord)betweentheendsofthedeformationsshallnotexc
36、eed25%/nofthenominalperimeterofthebar,wherenisthenumberoflongitudinalgapsorlongitudinalribsaroundtheperimeterofthebar.A955/A955M 1235.2.1 Annealed (A).5.2.2 Hot rolled (HR).5.2.3 Strain hardened (B).NOTE 3The mechanical properties of the material result from the heat treat condition of the material.
37、 Any further heat treatment of the material mayalter those properties and affect their ability to meet the specified strength level. No re-treatment should be imposed without retesting to the requirementsof this specification.6. Chemical Composition6.1The6.1 The chemical analysis of each heat of ste
38、el shall be determined in accordance with Test Methods, Practices, andTerminology A751. The manufacturer shall make the analysis on test samples taken preferably during the pouring of the heat.6.2 The chemical composition agreed to between manufacturer and purchaser shall conform to the requirements
39、 in Table 1 ofSpecification A276.7. Requirements for Deformations7.1 Deformations shall be spaced along the bar at substantially uniform distances. The deformations on all sides of the bar shallbe similar in size, shape, and pattern.7.2 The deformations shall be placed with respect to the axis of th
40、e bar so that the included angle is not less than 45. Wherethe line of deformations forms an included angle with the axis of the bar of from 45 to 70 inclusive, the deformations on atwo-sided bar shall alternately reverse in direction on each side or those on one side shall be reversed in direction
41、from those onthe opposite side. The deformations on three-sided bars shall reverse on one of the three sides (see Fig. 1). Where the line ofdeformation is over 70, a reversal in direction is not required.7.3 The average spacing or distance between deformations on each side of the bar shall not excee
42、d seven tenths of the nominaldiameter of the bar.7.4 The overall length of deformations shall be such that the gap (measured as a chord) between the ends of the deformationsshall not exceed 25 %/n, where n is the number of longitudinal gaps or longitudinal ribs, of the nominal perimeter of the bar.
43、Wherethe ends of the deformations terminate in a longitudinal rib, the width of the longitudinal rib shall be considered as the gap betweenTABLE 2 Chemical Requirements of Typical AlloysAUNSDesignationComposition %Type Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Molybdenum NitrogenS24
44、000 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 0.10S31653 316LN 0.
45、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.FIG. 1 Typical Three-Sided Deformed BarA955/A955M 124these ends. The summation of the gaps shall not exceed 25 % of the
46、nominal perimeter of the bar. The nominal perimeter of thebar shall be 3.1416 times the nominal diameter.7.5 The spacing, height, and gap of deformations shall conform to the requirements prescribed in Table 1.8. Measurement of Deformations8.1 The average spacing of deformations shall be determined
47、by measuring the length of a minimum of ten spaces and dividingthat length by the number of spaces included in the measurement. The measurement shall begin from a point on a deformation atthe beginning of the first space to a corresponding point on a deformation after the last included space. Spacin
48、g measurements shallnot be made over a bar area containing bar marking symbols.8.2 The average height of deformations shall be determined from measurements made on not less than two typical deformations.Determinations shall be based on three measurements per deformation, one at the center of the overall length and the other twoat 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, insufficient circumferential coverage, or excessive spacing of deformations shall not constitute
