ASTM A615－螺纹钢和普通圆钢的标准规范

Designation: A 615/A 615M – 01b American Association State Highway andTransportation Officials Standard AASHTO No.: M 31 Standard Specification for Deformed and Plain Billet-Steel Bars for Concrete Reinforcement1 This standard is issued under the fixed designation A 615/A 615M; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. 1. Scope 1.1 This specification covers deformed and plain billet-steel bars for concrete reinforcement in cut lengths and coils. The standard sizes and dimensions of deformed bars and their number designations are given in Table 1. The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as require- ments of the specification. 1.2 Bars are of three minimum yield levels: namely, 40 000 [280 MPa], 60 000 [420 MPa], and 75 000 psi [520 MPa], designated as Grade 40 [280], Grade 60 [420], and Grade 75 [520], respectively. 1.3 Hot-rolled plain rounds, in sizes up to and including 2 in. [50.8 mm] in diameter in coils or cut lengths, when specified for dowels, spirals and structural ties or supports shall be furnished under this specification in Grade 40 [280], Grade 60 [420], and Grade 75 [520]. For ductility properties (elon- gation and bending), test provisions of the nearest smaller nominal diameter deformed bar size shall apply. Requirements providing for deformations and marking shall not be appli- cable. NOTE 1—Welding of the material in this specification should be approached with caution since no specific provisions have been included to enhance its weldability. When steel is to be welded, a welding procedure suitable for the chemical composition and intended use or service should be used. The use of the latest edition of ANSI/AWS D 1.4 is recommended. This document describes the proper selection of the filler metals, preheat/interpass temperatures, as well as, performance and procedure qualification requirements. 1.4 This specification is applicable for orders in either inch-pound units (as Specification A 615) or in SI units (as Specification A 615M). 1.5 The values stated in either inch-pound units or SI units are to be regarded as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used inde- pendently of the other. Combining values from the two systems may result in nonconformance with the specification. 2. Referenced Documents 2.1 ASTM Standards: A 6/A 6M Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling2 A 370 Test Methods and Definitions for Mechanical Testing of Steel Products3 A 510 Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel3 A 510M Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel (Metric)3 A 700 Practices for Packaging, Marking, and Loading Methods for Steel Products for Domestic Shipment4 A 706/A 706M Specification for Low-Alloy Steel De- formed and Plain Bars for Concrete Reinforcement2 E 29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications5 2.2 AWS Standard: ANSI/AWS D 1.4 Structural Welding Code—Reinforcing Steel6 2.3 U.S. Military Standards: MIL-STD-129 Marking for Shipment and Storage7 MIL-STD-163 Steel Mill Products Preparation for Ship- ment and Storage7 2.4 U.S. Federal Standard: Fed. Std. No. 123 Marking for Shipment (Civil Agencies)7 3. Terminology 3.1 Definitions of Terms Specific to This Standard: 3.1.1 deformed bar, n—steel bar with protrusions; a bar that 1 This specification is under the jurisdiction of ASTM Committee A01 on Steel, Stainless Steel, and Related Alloys and is the direct responsibility of Subcommittee A01.05 on Steel Reinforcement. Current edition approved Oct. 10, 2001. Published November 2001. Originally published as A 615 – 68. Last previous edition A 615/A 615M – 01a. 2 Annual Book of ASTM Standards, Vol 01.04. 3 Annual Book of ASTM Standards, Vol 01.03. 4 Annual Book of ASTM Standards, Vol 01.05. 5 Annual Book of ASTM Standards, Vol 14.02. 6 Available from American Welding Society, 550 N.W. LeJeune Road, P.O. Box 351040, Miami, FL 33135. 7 Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700 Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS. 1 Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States. is intended for use as reinforcement in reinforced concrete construction. 3.1.1.1 Discussion—The surface of the bar is provided with lugs or protrusions that inhibit longitudinal movement of the bar relative to the concrete surrounding the bar in such construction. The lugs or protusions conform to the provisions of this specification. 3.1.2 deformations, n—protrusions on a deformed bar. 3.1.3 plain bar, n—steel bar without protrusions. 3.1.4 rib, n—longitudinal protrusion on a deformed bar. 4. Ordering Information 4.1 It shall be the responsibility of the purchaser to specify all requirements that are necessary for material ordered to this specification. 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 billet-steel bars for concrete reinforcement), 4.1.3 Size, 4.1.4 Cut lengths or coils, 4.1.5 Deformed or plain, 4.1.6 Grade, 4.1.7 Packaging (see Section 21), 4.1.8 ASTM designation and year of issue, and 4.1.9 Certified mill test reports (if desired). (See Section 16.) NOTE 2—A typical ordering description is as follows: 20 tons, de- formed and plain billet-steel bars for concrete reinforcement, No. 8, 60 ft 0 in. long, deformed, Grade 60, in secured lifts, to ASTM A 615 – __ . Certified mill test reports are required. [19 tons, deformed and plain billet-steel bars for concrete reinforce- ment, No. 25, 18.3-m long, deformed, Grade 420, in secured lifts to ASTM A 615M – __ . Certified mill test reports are required.] 5. Material and Manufacture 5.1 The bars shall be rolled from properly identified heats of mold cast or strand cast steel using the open-hearth, basic- oxygen, or electric-furnace process. 6. Chemical Composition 6.1 An analysis of each heat of steel shall be made by the manufacturer from test samples taken preferably during the pouring of the heats. The percentages of carbon, manganese, phosphorus, and sulfur, shall be determined. The phosphorus content thus determined shall not exceed 0.06 %. 6.2 An analysis may be made by the purchaser from finished bars. The phosphorus content thus determined shall not exceed that specified in 6.1 by more than 25 %. 7. Requirements for Deformations 7.1 Deformations shall be spaced along the bar at substan- tially uniform distances. The deformations on opposite sides of the bar shall be similar in size, shape, and pattern. 7.2 The deformations shall be placed with respect to the axis of the bar so that the included angle is not less than 45°. Where the line of deformations forms an included angle with the axis of the bar from 45 to 70° inclusive, the deformations shall alternately reverse in direction on each side, or those on one side shall be reversed in direction from those on the opposite side. Where the line of deformations is over 70°, a reversal in direction shall not be required. 7.3 The average spacing or distance between deformations on each side of the bar shall not exceed seven tenths of the nominal diameter of the bar. 7.4 The overall length of deformations shall be such that the gap between the ends of the deformations on opposite sides of the bar shall not exceed 121⁄2 % of the nominal perimeter of the bar. Where the ends terminate in a longitudinal rib, the width of the longitudinal rib shall be considered the gap. Where more than two longitudinal ribs are involved, the total width of all longitudinal ribs shall not exceed 25 % of the nominal perim- eter of the bar; furthermore, the summation of gaps shall not exceed 25 % of the nominal perimeter of the bar. The nominal perimeter of the bar shall be 3.14 times the nominal diameter. 7.5 The spacing, height, and gap of deformations shall conform to the requirements prescribed in Table 1. 8. Measurements of Deformations 8.1 The average spacing of deformations shall be deter- mined by measuring the length of a minimum of 10 spaces and dividing that length by the number of spaces included in the measurement. The measurement shall begin from a point on a deformation at the beginning of the first space to a correspond- ing point on a deformation after the last included space. TABLE 1 Deformed Bar Designation Numbers, Nominal Weights [Masses], Nominal Dimensions, and Deformation Requirements Bar Designation No.A Nominal Weight, lb/ft [Nominal Mass, kg/m] Nominal DimensionsB Deformation Requirements, in. [mm] Diameter, in. [mm] Cross-Sectional Area, in.2 [mm2] Perimeter, in. [mm] Maximum Average Spacing Minimum Average Height Maximum Gap (Chord of 12.5 % of Nominal Perimeter) 3 [10] 0.376 [0.560] 0.375 [9.5] 0.11 [71] 1.178 [29.9] 0.262 [6.7] 0.015 [0.38] 0.143 [3.6] 4 [13] 0.668 [0.994] 0.500 [12.7] 0.20 [129] 1.571 [39.9] 0.350 [8.9] 0.020 [0.51] 0.191 [4.9] 5 [16] 1.043 [1.552] 0.625 [15.9] 0.31 [199] 1.963 [49.9] 0.437 [11.1] 0.028 [0.71] 0.239 [6.1] 6 [19] 1.502 [2.235] 0.750 [19.1] 0.44 [284] 2.356 [59.8] 0.525 [13.3] 0.038 [0.97] 0.286 [7.3] 7 [22] 2.044 [3.042] 0.875 [22.2] 0.60 [387] 2.749 [69.8] 0.612 [15.5] 0.044 [1.12] 0.334 [8.5] 8 [25] 2.670 [3.973] 1.000 [25.4] 0.79 [510] 3.142 [79.8] 0.700 [17.8] 0.050 [1.27] 0.383 [9.7] 9 [29] 3.400 [5.060] 1.128 [28.7] 1.00 [645] 3.544 [90.0] 0.790 [20.1] 0.056 [1.42] 0.431 [10.9] 10 [32] 4.303 [6.404] 1.270 [32.3] 1.27 [819] 3.990 [101.3] 0.889 [22.6] 0.064 [1.63] 0.487 [12.4] 11 [36] 5.313 [7.907] 1.410 [35.8] 1.56 [1006] 4.430 [112.5] 0.987 [25.1] 0.071 [1.80] 0.540 [13.7] 14 [43] 7.65 [11.38] 1.693 [43.0] 2.25 [1452] 5.32 [135.1] 1.185 [30.1] 0.085 [2.16] 0.648 [16.5] 18 [57] 13.60 [20.24] 2.257 [57.3] 4.00 [2581] 7.09 [180.1] 1.58 [40.1] 0.102 [2.59] 0.864 [21.9] ABar numbers are based on the number of eighths of an inch included in the nominal diameter of the bars [bar numbers approximate the number of millimetres of the nominal diameter of the bar]. BThe nominal dimensions of a deformed bar are equivalent to those of a plain round bar having the same weight [mass] per foot [metre] as the deformed bar. A 615/A 615M 2 Spacing measurments shall not be made over a bar area containing bar marking symbols involving letters or numbers. 8.2 The average height of deformations shall be determined from measurements made on not less than two typical defor- mations. Determinations shall be based on three measurements per deformation, one at the center of the overall length and the other two at the quarter points of the overall length. 8.3 Insufficient height, insufficient circumferential cover- age, or excessive spacing of deformations shall not constitute cause for rejection unless it has been clearly established by determinations on each lot (Note 3) tested that typical defor- mation height, gap, or spacing do not conform to the minimum requirements prescribed in Section 7. No rejection shall be made on the basis of measurements if fewer than ten adjacent deformations on each side of the bar are measured. NOTE 3—As used within the intent of 8.3, the term “lot” shall mean all the bars of one bar size and pattern of deformations contained in an individual shipping release or shipping order. 9. Tensile Requirements 9.1 The material, as represented by the test specimens, shall conform to the requirements for tensile properties prescribed in Table 2. 9.2 The yield point or yield strength shall be determined by one of the following methods: 9.2.1 The yield point shall be determined by drop of the beam or halt in the gage of the testing machine. 9.2.2 Where the steel tested does not have a well-defined yield point, the yield strength shall be determined by reading the stress corresponding to the prescribed strain using an autographic diagram method or an extensometer as described in Test Methods and Definitions A 370. The strain shall be 0.5 % of gage length for Grade 40 [280] and Grade 60 [420] and shall be 0.35 % of gage length for Grade 75 [520]. When material is furnished in coils, the test sample shall be straight- ened prior to placing it in the jaws of the tensile machine. Straightening shall be done carefully to avoid formation of local sharp bends and to minimize cold work. Insufficient straightening prior to attaching the extensometer can result in lower-than-actual yield strength readings. 9.3 The percentage of elongation shall be as prescribed in Table 2. 10. Bending Requirements 10.1 The bend-test specimen shall withstand being bent around a pin without cracking on the outside radius of the bent portion. The requirements for degree of bending and sizes of pins are prescribed in Table 3. When material is furnished in coils, the test sample shall be straightened prior to placing it in the bend tester. 10.2 The bend test shall be made on specimens of sufficient length to ensure free bending and with apparatus which provides: 10.2.1 Continuous and uniform application of force throughout the duration of the bending operation. 10.2.2 Unrestricted movement of the specimen at points of contact with the apparatus and bending around a pin free to rotate. 10.2.3 Close wrapping of the specimen around the pin during the bending operation. 10.3 Other acceptable more severe methods of bend testing, such as placing a specimen across two pins free to rotate and applying the bending force with a fixed pin, may be used. When failures occur under more severe methods, retests shall be permitted under the bend-test method prescribed in 10.2. 11. Permissible Variation in Weight [Mass] 11.1 Deformed reinforcing bars shall be evaluated on the basis of nominal weight [mass]. The weight [mass] determined using the measured weight [mass] of the test specimen and rounding in accordance with Practice E 29, shall be at least 94 % of the applicable weight [mass] per unit length prescribed in Table 1. In no case shall overweight [excess mass] of any deformed bar be the cause for rejection. Weight [mass] variation for plain rounds shall be computed on the basis of permissible variation in diameter. For plain bars smaller than 3⁄8in. [9.5 mm], use Specification A 510 [Specification A 510M]. For larger bars up to and including 2 in. [50.8 mm], use Specification A 6/A 6M. 12. Finish 12.1 The bars shall be free of detrimental surface imperfec- tions. 12.2 Rust, seams, surface irregularities, or mill scale shall not be cause for rejection, provided the weight, dimensions, cross-sectional area, and tensile properties of a hand wire brushed test specimen are not less than the requirements of this specification. 12.3 Surface imperfections or flaws other than those speci- fied in 12.2 shall be considered detrimental when specimens containing such imperfections fail to conform to either tensile TABLE 2 Tensile Requirements Grade 40 [280]A Grade 60 [420] Grade 75 [520]B Tensile strength, min, psi [MPa] 60 000 [420] 90 000 [620] 100 000 [690] Yield strength, min, psi [MPa] 40 000 [280] 60 000 [420] 75 000 [520] Elongation in 8 in. [203.2 mm], min, %: Bar Designation No. 3 [10] 11 9 . . . 4, 5 [13, 16] 12 9 . . . 6 [19] 12 9 7 7, 8 [22, 25] . . . 8 7 9, 10, 11 [29, 32, 36] . . . 7 6 14, 18 [43, 57] . . . 7 6 AGrade 40 [280] bars are furnished only in sizes 3 through 6 [10 through 19]. BGrade 75 [520] bars are furnished only in sizes 6 through 18 [19 through 57]. TABLE 3 Bend Test Requirements Bar Designation No. Pin Diameter for Bend TestsA Grade 40 [280] Grade 60 [420] Grade 75 [520] 3, 4, 5 [10, 13, 16] 31⁄2d B 31⁄2d . . . 6 [19] 5d 5d 5d 7, 8 [22, 25] . . . 5d 5d 9, 10, 11 [29, 32, 36] . . . 7d 7d 14, 18 [43, 57] (90°) . . . 9d 9d ATest bends 180° unless noted otherwise. Bd = nominal diameter of specimen. A 615/A 615M 3 or bending requirements. Examples include, but are not limited to, laps, seams, scabs, slivers, cooling or casting cracks, and mill or guide marks. NOTE 4—Reinforcing bar intended for epoxy coating applications should have surfaces with a minimum of sharp edges to achieve proper cover. Particular attention should be given to bar marks and deformations where coating difficulties are prone to occur. NOTE 5—Deformed bars destined to be mechanically-spliced or butt- welded may require a certain degree of roundness in order for the splices to adequately achieve strength requirements. 13. Number of Tests 13.1 For bar sizes No. 3 to 11 [10 to 36], inclusive, one tension test and one bend test shall be made of the largest size rolled from each heat. If, however, material from one heat differs by three or more designation numbers, one tension and one bend test shall be made from both the highest and lowest designation number of the deformed bars rolled. 13.2 For bar sizes Nos. 14 and 18 [43 and 57], one tension test and one bend test shall be made of each size rolled from each heat. 14. Retests 14.1 If any tensile property of any tension test specimen is less than that specified, and any part of the fracture is outside the middle third of the gage length, as indicated by scribe scratches marked on the specimen before testing, a retest shall be allowed. 14.2 If the results of an original tension specimen fail to meet the specified minimum requirements and are within 2000 psi [14 MPa] of the required tensile strength, within 1000 psi [7 MPa] of the required yield point, or within two percentage units of the required elongation, a retest shall be permitted on two random specimens for each original tension specimen failure from the lot. Both retest specimens shall meet the requirements of this specification. 14.3 If a bend test fails for reasons other than mechanical reasons or flaws in the specimen as described in 14.5 and 14.6, a retest shall be permitted on two random specimens from the same lot. Both retest specimens shall meet the requirements of this specification. The retest shall be performed on test speci- mens that are at air temperature but not less than 60°F [16°C]. 14.4 If a weight [mass] test fails for reasons other than flaws in the specimen as described in 14.6, a retest shall be permitted on two random specimens from the same lot. Both retest specimens shall meet the requirements of this specification. 14.5 If any test specimen fails because of mechanical reasons such as failure of testing equipment or improper specimen preparation, it may be discarded and another speci- men taken. 14.6 If flaws are detected in a test specimen, either before or during the performance of the test, it may be discarded and another specimen of the same size bar from the same heat substituted. 15. Test Specimens 15.1 All mechanical tests shall be conducted in accordance with Test Methods and Definitions A 370 including Annex A9. 15.2 Tension test specimens shall be the full section of the bar as rolled. The unit stress determination shall be based on the nominal bar area. 15.3 The bend-test specimens shall be the full section of the bar as rolled. 16. Test Reports 16.1 When specified in the purchase order, report the following information, on a per heat basis. Additional items may be reported as requested or desired. 16.1.1 Chemical analysis including carbon, manganese, phosphorus,