1、Standard Specification for Stainless Clad Deformed and Plain Round Steel Bars for Concrete Reinforcement AASHTO Designation: M 329M/M 329-11 (2015)1American 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
2、AASHTO Standard Specification for Stainless Clad Deformed and Plain Round Steel Bars for Concrete Reinforcement AASHTO Designation: M 329M/M 329-11 (2015)11. SCOPE 1.1. This specification covers the stainless steelclad concrete reinforcement bars in cut lengths or coils, deformed and plain round. Th
3、e standard sizes 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, 3
4、00 MPa 40,000 psi, 420 MPa 60,000 psi, and 520 MPa 75,000 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 ti
5、es or supports, 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 ma
6、rking shall not 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 A510/A510M. 1.4. Welding of the material in this specification should not be attempted since no experience has been demonstrated regarding weldab
7、ility of this product. Mechanical coupling should be specified for bars requiring continuous longitudinal connection. Mechanical couplings must conform to ASTM A276, 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
8、inch-pound units are 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. 2015 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication i
9、s a violation of applicable 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, m
10、m2Perimeter, mm Maximum Average 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 3.9
11、73 25.4 510 79.8 17.8 1.27 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 p
12、lain round bar having the 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 Nomin
13、al DimensionsaDeformation Requirements, in. Bar Designation No.bNominal Weight, lb/ft Diameter, in. Cross- Sectional Area, in.2Perimeter, in. Maximum Average 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
14、 1.571 0.350 0.020 0.191 5 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
15、.56 4.430 0.987 0.071 0.540 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
16、 of eighths of an inch included 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 2015 by the American Association of State Highway and Transportation Officials.All righ
17、ts reserved. Duplication is a violation of applicable law.TS-4g M 329M/M 329-3 AASHTO 2.2. ASTM Standards: A6/A6M, Standard Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet Piling A264, Standard Specification for Stainless Chromium-Nickel Steel-Clad
18、Plate A276, Standard Specification for Stainless Steel Bars and Shapes A510/A510M, Standard Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel, and Alloy Steel A700-05, Standard Practices for Packaging, Marking, and Loading Methods for Steel Products for Shipmen
19、t (withdrawn 2014) A959, Standard Guide for Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels E29, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications E190, Standard Test Method for Guided Bend Test for Ductility of We
20、lds G12, Standard Test Method for Nondestructive Measurement of Film Thickness of Pipeline Coatings on Steel (withdrawn 2013) 2.3. Military Standards: MIL-STD-129, Marking for Shipment and Storage MIL-STD-163, Steel Mill Products Preparation for Shipment and Storage 2.4. Federal Standard: Fed. Std.
21、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 intended for use as reinforcement in re
22、inforced 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 provisions of this specification. 3.1
23、.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 surfaces, heat energy, and mechanical pr
24、essure. 3.1.5. plain bara round, square, or hexagonal steel bar without protrusions. 3.1.6. riblongitudinal protrusion on a deformed bar. 2015 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 32
25、9-4 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 corrosion protection to the level provi
26、ded by the thickness of the alloy furnished. The stainless steelclad 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: 4.1.1. Quantity (mass) weight; 4.1.2. Name of
27、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; 4.1.9. Certified mill test reports (if desi
28、red); 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, deformed, Grade 420, in secured lifts, to M
29、 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 reinforcement, No. 8, 60 ft 0 in. long, deformed,
30、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 shall be rolled from properly identified heat
31、s/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 identified in Table 3 shall be determined along wit
32、h identification of stainless alloy cladding, and conformance of its analysis with ASTM A276, Type 316 or Type 316L. 2015 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 329-5 AASHTO 6.2. The p
33、urchaser 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 A6/A6M. Table 3Chemical Requirements of Core Steels Element % of Ele
34、ment by Weight Carbon 0.45 max Manganese 1.40 max Phosphorus 0.040 max Sulfur 0.050 max Silicon 0.040.40 Chromium Nickel Copper Molybdenum Vanadium Note: Where a dash appears, there is no requirement. 7. REQUIREMENTS FOR STAINLESS STEEL CLADDING 7.1. Stainless steel cladding shall meet the requireme
35、nts of ASTM A959 A276, 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 of the completed bar. 7.3. Cladding Thick
36、ness: 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 cause for rejection. 7.3.2. A single recor
37、ded 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 minimum of ten recorded measurements per ba
38、r) 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 of the bar as rolled. 7.3.4.1. Measuremen
39、ts shall be made in accordance with ASTM G12, 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 (i.e., do not record the reading) shall no
40、t 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 requirements, the heat/lot shall be accepted
41、. 7.4. Bond StrengthThe cladding/core shall have minimum bond strength of 20 ksi per ASTM A264. 2015 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 8. REQUIREMENTS FOR DEFORMATION
42、S 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 that the included angle is not less than 45 d
43、egrees. 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 those on the opposite side. Where the line o
44、f 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 of deformations shall be such that the gap be
45、tween 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 than two longitudinal ribs are involved, the to
46、tal 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 nominal diameter. 8.5. The spacing, height,
47、 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 length by the number of spaces included in the m
48、easurement. 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 symbols involving letters or numbers. 9.2.
49、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 rejection unless it has been es
