1、Standard Specification for Stainless Clad Deformed and Plain Round Steel Bars for Concrete Reinforcement AASHTO Designation: M 329M/M 329-111American Association of State Highway and Transportation Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001 TS-4g M 329M/M 329-1 AASHTO
2、Standard Specification for Stainless Clad Deformed and Plain Round Steel Bars for Concrete Reinforcement AASHTO Designation: M 329M/M 329-1111. SCOPE 1.1. This specification covers the stainless steel clad concrete reinforcement bars in cut lengths or coils, deformed and plain round. The standard si
3、zes and dimensions of deformed bars and their number designations shall be those listed in Table 1 Table 2. Note 1For coils of deformed bars, the capacity of industrial equipment limits the maximum bar size that can be straightened. 1.2. Bars are of three minimum yield levels: namely, 300 MPa 40000
4、psi, 420 MPa 60000 psi, and 520 MPa 75000 psi, designated as Grade 300 40, Grade 420 60, and Grade 520 75, respectively. 1.3. Hot-rolled plain rounds, in sizes up to and including 50.8 mm 2 in. in diameter in coils or cut lengths, when specified for dowels, spirals, and structural ties or supports,
5、shall be furnished under this specification in Grade 300 40, Grade 420 60, and Grade 520 75 (Note 2). For ductility properties (elongation and bending), test provisions of the nearest nominal diameter deformed bar size shall apply. Those requirements providing for deformations and marking shall not
6、be applicable. Note 2The weight for plain rounds smaller than 9.5 mm 3/8in. in diameter shall be computed on the basis of the size in ASTM A 510. 1.4. Welding of the material in this specification should not be attempted since no experience has been demonstrated regarding weldability of this product
7、. Mechanical coupling should be specified for bars requiring continuous longitudinal connection. Mechanical couplings must conform to ASTM A 276, UNS S31803. 1.5. This specification is applicable for orders in either SI units (M 329M) or in inch-pound units (M 329). SI units and inch-pound units are
8、 not necessarily equivalent. Inch-pound units are shown in brackets in the text for clarity, but they are the applicable values when the material is ordered to M 329. 2011 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of app
9、licable law.TS-4g M 329M/M 329-2 AASHTO Table 1Deformed Bar Designation Numbers, Nominal Masses, Nominal Dimensions, and Deformation Requirements, SI Units Nominal DimensionsaDeformation Requirements, mm Bar Designation No.bNominal Mass, kg/m Diameter, mm Cross- Sectional Area, mm2Perimeter,mm Maxim
10、umAverage Spacing Minimum Average Height Maximum Gap (Chord of 12.5%of Nominal Perimeter) 10 0.560 9.5 71 29.9 6.7 0.38 3.6 13 0.994 12.7 129 39.9 8.9 0.51 4.9 16 1.552 15.9 199 49.9 11.1 0.71 6.1 19 2.235 19.1 284 59.8 13.3 0.97 7.3 22 3.042 22.2 387 69.8 15.5 1.12 8.5 25 3.973 25.4 510 79.8 17.8 1
11、.27 9.7 29 5.060 28.7 645 90.0 20.1 1.42 10.9 32 6.404 32.3 819 101.3 22.6 1.63 12.4 36 7.907 35.8 1006 112.5 25.1 1.80 13.7 43 11.38 43.0 1452 135.1 30.1 2.16 16.5 57 20.24 57.3 2581 180.1 40.1 2.59 21.9 aThe nominal dimensions of a deformed bar are equivalent to those of a plain round bar having t
12、he same mass per meter as the deformed bar. bBar designation numbers approximate the number of millimeters of the nominal diameter of the bar. Table 2Deformed Bar Designation Numbers, Nominal Weights, Nominal Dimensions, and Deformation Requirements, U.S. Customary Units Nominal DimensionsaDeformati
13、on Requirements, in. Bar Designation No.bNominal Weight, lb/ft Diameter, in. Cross- SectionalArea, in.2Perimeter,in. MaximumAverage Spacing Minimum Average Height Maximum Gap (Chord of 12.5%of Nominal Perimeter) 3 0.376 0.375 0.11 1.178 0.262 0.015 0.143 4 0.668 0.500 0.20 1.571 0.350 0.020 0.191 5
14、1.043 0.625 0.31 1.963 0.437 0.028 0.239 6 1.502 0.750 0.44 2.356 0.525 0.038 0.286 7 2.044 0.875 0.60 2.749 0.612 0.044 0.334 8 2.670 1.000 0.79 3.142 0.700 0.050 0.383 9 3.400 1.128 1.00 3.544 0.790 0.056 0.431 10 4.303 1.270 1.27 3.990 0.889 0.064 0.487 11 5.313 1.410 1.56 4.430 0.987 0.071 0.540
15、 14 7.65 1.693 2.25 5.32 1.185 0.085 0.648 18 13.60 2.257 4.00 7.09 1.58 0.102 0.864 aThe nominal dimensions of a deformed bar are equivalent to those of a plain round bar having the same weight per foot as the deformed bar. bBar designation numbers are based on the number of eighths of an inch incl
16、uded in the nominal diameter of the bars. 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: T 244, Mechanical Testing of Steel Products T 285, Bend Test for Bars for Concrete Reinforcement 2011 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is
17、 a violation of applicable law.TS-4g M 329M/M 329-3 AASHTO 2.2. ASTM Standards: A 6/A 6M, Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling A 264, Standard Specification for Stainless Chromium-Nickel Steel-Clad Plate A 276, Standard Sp
18、ecification for Stainless Steel Bars and Shapes A 510, Standard Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel A 510M, Standard Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel (Metric) A 700, Standard Practices for Pa
19、ckaging, Marking, and Loading Methods for Steel Products for Shipment A 959, Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels E 29, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications E 190, Standar
20、d Test Method for Guided Bend Test for Ductility of Welds G 12, Standard Test Method for Nondestructive Measurement of Film Thickness of Pipeline Coatings on Steel 2.3. Military Standards: MIL-STD-129, Marking for Shipment and Storage MIL-STD-163, Steel Mill Products Preparation for Shipment and Sto
21、rage 2.4. Federal Standard: Fed. Std. No. 123, Marking for Shipment (Civil Agencies) 3. TERMINOLOGY 3.1. Definition of Terms Specific to This Standard: 3.1.1. completed barsteel bar with stainless cladding and deformations (if deformed). 3.1.2. deformed barsteel bar with protrusions; a bar that is i
22、ntended for use as reinforcement in reinforced concrete construction. 3.1.2.1. DiscussionThe 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 protrusions conform to the
23、 provisions of this specification. 3.1.3. deformationsprotrusions on a deformed bar. 3.1.4. metallurgical bondingthe joining of metals so as to form a permanent joint between the mating surfaces. The principal requirements of joining two metals to achieve a metallurgical bond are thoroughly clean su
24、rfaces, heat energy, and mechanical pressure. 3.1.5. plain bara round, square, or hexagonal steel bar without protrusions. 3.1.6. riblongitudinal protrusion on a deformed bar. 2011 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violati
25、on of applicable law.TS-4g M 329M/M 329-4 AASHTO 3.1.7. stainless clad barsteel bar with stainless cladding for corrosion protection. 3.1.7.1. DiscussionThe stainless cladding on the surface of the bar is provided by means of metallurgical bonding with the base steel. The stainless cladding offers c
26、orrosion protection to the level provided by the thickness of the alloy furnished. The stainless steel cladded reinforcement shall conform to the provisions of this specification. 4. ORDERING INFORMATION 4.1. Orders for material under this specification should include the following information: 4.1.
27、1. Quantity (mass) weight, 4.1.2. Name of material (stainless clad deformed and plain round steel bars for concrete reinforcement), 4.1.3. Size, 4.1.4. Cut length or coils, 4.1.5. Deformed or plain round, 4.1.6. Grade, 4.1.7. Packaging (see Section 19), 4.1.8. AASHTO designation and year of issue, 4
28、.1.9. Certified mill test reports (if desired), and 4.1.10. Country of origin, which identifies producer and where material was produced. Note 3A typical ordering description is as follows: 10 000 kg , stainless clad deformed and plain round steel bars for concrete reinforcement, No. 25, 18 m long,
29、deformed, Grade 420, in secured lifts, to M 329M/M 329-_. Certified mill test reports are required. Metric: Bundles shall have tags identifying the producer, the heat/lot number, and where the material was manufactured. 10 tons, stainless clad deformed and plain round steel bars for concrete reinfor
30、cement, No. 8, 60 ft 0 in. long, deformed, Grade 60, in secured lifts, to M 329M/M 329-_. Certified mill test reports are required. Customary: Bundles shall have tags identifying the producer, the heat/lot number, and where the material was manufactured. 5. MATERIALS AND MANUFACTURE 5.1. The bars sh
31、all be rolled from properly identified heats/lots of stainless clad and core steel billets. 6. CHEMICAL REQUIREMENTS OF BAR 6.1. The manufacturer shall make an analysis of each heat/lot of steel from test samples taken preferably on the finished product. The percentages of required elements identifi
32、ed in Table 3 shall be determined along with identification of stainless alloy cladding, and conformance of its analysis with ASTM A 276, Type 316 or Type 316L. 2011 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicabl
33、e law.TS-4g M 329M/M 329-5 AASHTO 6.2. The purchaser may make an analysis from finished bars. The product analysis of the core steel of the finished bars may vary from the heat analysis requirements of Table 3 by the percentages listed for each element as per Table B of ASTM A 6/A 6M. Table 3Chemica
34、l Requirements of Core Steels Element % of Element by Weight Carbon 0.45 max Manganese 1.40 maPhosphorus 0.040 max Sulfur 0.050 maSilicon 0.040.40 Chromium Nickel CopperMolybdenum VanadiumNote: Where a dash appears, there is no requirement. 7. REQUIREMENTS FOR STAINLESS STEEL CLADDING 7.1. Stainless
35、 steel cladding shall meet the requirements of ASTM A 959 A 276, UNS S31600, or UNS S31603. These are austenitic, nonmagnetic stainless steels and will allow for the use of magnetic thickness gauges in determining coating thickness. 7.2. Stainless steel cladding shall be applied prior to the rolling
36、 of the completed bar. 7.3. Cladding Thickness: 7.3.1. For acceptance purpose, at least 90 percent of all recorded thickness measurements of the cladding on the completed bar shall be a minimum of 175 m 0.007 in. on the completed bar. Thickness measurements below 125 m 0.005 in. shall be considered
37、cause for rejection. 7.3.2. A single recorded thickness measurement is the average of three individual readings obtained between three consecutive deformations (or within a 50-mm 2-in. section for smooth bar). A minimum of five recorded measurements evenly spaced along each side of the test bar (a m
38、inimum of ten recorded measurements per bar) shall be obtained. 7.3.3. The cladding thickness shall be measured on the body of a straight length of bar between the deformations (or within a 50-mm 2-in. section for smooth bar). 7.3.4. Cladding thickness measurements shall be taken on the full section
39、 of the bar as rolled. 7.3.4.1. Measurements shall be made in accordance with ASTM G 12, following the instructions for calibration and use recommended by the thickness gauge manufacturer. Pull-off or fixed probe gauges shall be used. “Pencil-type” pull-off gauges that require instantaneous readings
40、 (i.e., do not record the reading) shall not be used. 7.3.4.2. If a specimen for cladding thickness fails to meet the specified requirements, two retests shall be permitted on two random specimens from the same heat/lot for each failed test. If the results of both test specimens meet the specified r
41、equirements, the heat/lot shall be accepted. 2011 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4g M 329M/M 329-6 AASHTO 7.4. Bond StrengthThe cladding/core shall have minimum bond strength of 20 ksi per
42、 ASTM A 264. 8. REQUIREMENTS FOR DEFORMATIONS 8.1. Deformations shall be spaced along the bar at substantially uniform distances. The deformations on opposite sides of the bar shall be similar in size, shape, and pattern. 8.2. The deformations shall be placed with respect to the axis of the bar so t
43、hat the included angle is not less than 45 degrees. Where the line of deformations forms an included angle with the axis of the bar from 45 degrees to 70 degrees inclusive, the deformations shall alternately reverse in direction on each side, or those on one side shall be reversed in direction from
44、those on the opposite side. Where the line of deformation is greater than 70 degrees, a reversal in direction is not required. 8.3. 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. 8.4. The overall length o
45、f deformations shall be such that the gap between the ends of the deformations on opposite sides of the bar shall not exceed 12.5 percent 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 tha
46、n two longitudinal ribs are involved, the total width of all longitudinal ribs shall not exceed 25 percent of the nominal perimeter of the bar; furthermore, the summation of gaps shall not exceed 25 percent of the nominal perimeter of the bar. The nominal perimeter of the bar shall be 3.14 times the
47、 nominal diameter. 8.5. The spacing, height, and gap of deformations shall conform to the requirements prescribed in Table 1 Table 2. 9. MEASUREMENTS OF DEFORMATIONS 9.1. The average spacing of deformations shall be determined by measuring the length of a minimum of ten spaces and dividing that leng
48、th 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 corresponding point on a deformation after the last included space. Spacing measurements shall not be made over a bar area containing bar-marking
49、 symbols involving letters or numbers. 9.2. The average height of deformations shall be determined from measurements made on not fewer than two typical deformations. 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. 9.3. Insufficient height, insufficient circumferential coverage, or excessive spacing of deformations shall not constitute cause for reject
