1、Standard Specification for Uncoated, Corrosion-Resistant, Deformed and Plain Chromium Alloyed, Billet-Steel Bars for Concrete Reinforcement and Dowels AASHTO Designation: M 334M/M 334-171 Technical Section: 4f, Metals Release: Group 2 (June 2017) American Association of State Highway and Transportat
2、ion Officials 444 North Capitol Street N.W., Suite 249 Washington, D.C. 20001TS 4f M 334M/M 334-1 AASHTO Standard Specification for Uncoated, Corrosion-Resistant, Deformed and Plain Chromium Alloyed, Billet-Steel Bars for Concrete Reinforcement and Dowels AASHTO Designation: M 334M/M 334-171Technica
3、l Section: 4f, Metals Release: Group 2 (June 2017) 1. SCOPE 1.1. This specification covers uncoated, corrosion-resistant, deformed and plain chromium alloyed, billet-steel concrete reinforcement and dowel bars in cut lengths or coils (Notes 1 and 2). The standard sizes and dimensions of deformed bar
4、s and their number designations shall be those listed in Table 2 for millimeter-kilogram bars Table 3 for inch-pound bars. Note 1For coils of deformed bars, the capacity of industrial equipment limits the maximum bar size that can be straightened. Note 2The degree of corrosion resistance specified f
5、or both concrete reinforcement and dowel bars is typically dependent on the type of structure, the expected in-service environmental conditions, and the material properties of the concrete in which they are embedded. 1.2. Bars are of three minimum yield levels: 420 MPa 60,000 psi, 550 MPa 80,000 psi
6、, and 690 MPa 100,000 psi, designated as Grade 420 60, Grade 550 80, and Grade 690 100, respectively. 1.3. Hot-rolled plain rounds, in sizes up to and including 57 mm 2.25 in. in diameter in coils or cut lengths, when specified for dowels, spirals, and structural ties or supports, shall be furnished
7、 under this specification in Grade 420 60, Grade 550 80, and Grade 690 100 (Note 3). For ductility properties, test provisions of the nearest nominal diameter deformed bar size shall apply. Those requirements providing for deformations and marking shall not be applicable (Note 3). Note 3The weight f
8、or plain rounds smaller than 10 mm 3/8in. in diameter shall be computed on the basis of the size in ASTM A510/A510M. Note 4When welding of the material listed in this specification is required, it should be in conformance with AWS D1.4 Structural Welding CodeReinforcing Steel and the applicable sect
9、ions of AWS D1.6 Structural Welding CodeStainless Steels. If the material is not addressed in these specifications, the manufacturer of the steel should be contacted to obtain a welding procedure for the particular application. 1.4. This specification is applicable for orders in either SI units (as
10、M 334M) or in inch-pound units (as M 334). SI units and 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 334. 2017 by the American Association of State Highway and Tra
11、nsportation Officials.All rights reserved. Duplication is a violation of applicable law.TS 4f M 334M/M 334-2 AASHTO 2. REFERENCED DOCUMENTS 2.1. AASHTO Standards: T 244, Mechanical Testing of Steel Products T 285, Bend Test for Bars for Concrete Reinforcement T 372M/T 372, Sensitivity of Stainless S
12、teel to Intergranular Attack T 373M/T 373, Comparative Qualitative Corrosion Characterization of Steel Bars Used for Concrete Reinforcement (Linear Polarization Resistance and Potentiodynamic Polarization Tests) T 374M/T 374, Comparative Qualitative Corrosion Characterization of Uncoated Chromium-Al
13、loyed Steel Bars Used in Concrete Reinforcement (Tombstone Test) T 375M/T 375, Identification of IronBased Alloy Steel Bars for Concrete Reinforcement or Dowels by Handheld XRay Fluorescence (XRF) Spectrometer T 376M/T 376, Macrocell Slab Chloride Threshold 2.2. ASTM Standards: A276/A276M, Standard
14、Specification for Stainless Steel Bars and Shapes A484/A484M, Standard Specification for General Requirements for Stainless Steel Bars, Billets, and Forgings A510/A510M, Standard Specification for General Requirements for Wire Rods and Coarse Round Wire, Carbon Steel, and Alloy Steel A700, Standard
15、Guide for Packaging, Marking, and Loading Methods for Steel Products for Shipment A751, Standard Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products A955/A955M, Standard Specification for Deformed and Plain Stainless-Steel Bars for Concrete Reinforcement A1035/A1035M, St
16、andard Specification for Deformed and Plain, Low-Carbon, Chromium, Steel Bars for Concrete Reinforcement E29, Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications 2.3. Military Standards: MIL-STD-129, Marking for Shipment and Storage MIL-STD-163, S
17、teel Mill Products Preparation for Shipment and Storage 2.4. Federal Standard: Fed. Std. No. 123, Marking for Shipment (Civil Agencies) 2.5. AWS Standards: AWS D1.4, Structural Welding CodeReinforcing Steel AWS D1.6, Structural Welding CodeStainless Steels 3. TERMINOLOGY 3.1. Description of Terms Sp
18、ecific to This Standard: 2017 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS 4f M 334M/M 334-3 AASHTO 3.1.1. corrosion-resistanta relative term indicating resistance to the several forms of corrosion in v
19、arious environments or corroding media, often compared to the resistance of uncoated plain carbon steels in the same environment or media. 3.1.2. deformed barsteel bar with protrusions; a bar that is intended for use as reinforcement in reinforced concrete construction. 3.1.2.1. DiscussionThe surfac
20、e 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. 3.1.3. deformationsprotrusions on a deformed bar. 3.1.4. plain b
21、arsteel bar without protrusions. 3.1.5. riblongitudinal protrusion on a deformed bar. 3.1.6. lotbars of one bar number, heat number, and pattern of deformation contained in an individual shipping release or shipping order. 3.1.7. heata batch of steel produced to meet specified physical and chemical
22、properties. A unique heat number is assigned by the manufacturer to identify each batch of steel. 3.1.8. Uncoated Corrosion Resistant Reinforcement (CRR)concrete reinforcing bar materials, because of their chemical composition and or microstructure, provide enhanced corrosion resistance properties.
23、4. ORDERING INFORMATION 4.1. Orders for deformed or plain chromium-alloyed steel billet-steel bars for concrete reinforcement under this specification should include the following information: 4.1.1. Quantity (mass) weight; 4.1.2. UNS number of the alloy, Type or Common Name (see Table 1); 4.1.3. Si
24、ze (diameter) or bar designation number (see Table 2 for mm-kg bars or Table 3 for in-lb bars); 4.1.4. Cut length or coils; 4.1.5. Deformed or plain; 4.1.6. Grade; 4.1.7. Packaging (see Section 22); and 4.1.8. AASHTO designation and year of issue. 4.2. Certified mill test reports (required for all o
25、rders). 4.3. The purchaser shall have the option to specify additional requirements, including but not limited to, the following: 2017 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS 4f M 334M/M 334-4 AASH
26、TO 4.3.1. Comparative corrosion performance data in accordance with Section 11 only when specified in the purchase order; 4.3.2. Special bar markings; 4.3.3. Other special requirements, if any. 5. MATERIALS AND MANUFACTURE 5.1. The steel reinforcement bars for concrete reinforcement and dowels confo
27、rming to this standard shall be rolled from individual heats that are properly identified and documented using any commercially accepted steelmaking process. 6. CHEMICAL REQUIREMENTS 6.1. The chemical analysis of each heat shall be determined in accordance with ASTM A751. The manufacturer shall make
28、 the analysis on test samples taken preferably during the pouring of the heat. The percentages of carbon, sulfur, nitrogen, manganese, phosphorus, silicon, chromium, nickel, copper, molybdenum, and vanadium shall be determined and reported as required in Section 20. 6.2. The analysis of the heat sha
29、ll be made by the manufacturer and shall conform to the analysis tolerances specified in Table 1 of ASTM A484/A484M when compared to the chemistry reported. 6.2.1. A product check made by the purchaser shall conform to the analysis tolerances specified in Table 1 of ASTM A484/A484M when compared to
30、the chemistry reported. 6.3. The chemical composition as shown by heat analysis shall meet the requirements as shown in the following Table 1. 2017 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS-4f M 334M
31、/M 334-5 AASHTO Table 1Selected Compositional Requirements for Iron-Based, Chromium, and Chromium-Nickel Reinforcing BarsaUNS Designation Type or Common Name Composition, %bCarbon (C) Manganese (Mn) Chromium (Cr) Nickel (Ni) Molybdenum (Mo) Nitrogen (N) Other Elements Austenitic Stainless Steels S24
32、000 XM-29 0.08 11.5014.50 17.019.0 2.33.7 0.200.40 S24100 XM-28 0.15 11.0014.00 16.519.0 0.502.50 0.200.45 S30400 304 0.08 2.00 18.020.0 8.011.0 S30453 304LN 0.030 2.00 18.020.0 8.011.0 0.100.16 S31603 316L 0.030 2.00 16.018.0 10.014.0 2.003.00 S31653 316LN 0.030 2.00 16.018.0 10.013.0 2.003.00 0.10
33、0.16 Duplex (Austenitic-Ferritic) Stainless Steels S31803 2205 0.030 2.00 21.023.0 4.56.5 2.53.5 0.080.20 S32101 0.040 4.06.0 21.022.0 1.351.70 0.100.80 0.200.25 Cu: 0.100.80 S32205 2205 0.030 2.00 22.023.0 4.56.5 3.03.5 0.140.20 S32304 2304 0.030 2.50 21.524.5 3.05.5 0.050.60 0.050.20 Cu: 0.050.60
34、Other Chromium Alloyed Steelsc41003 A1010 0.025 1.50 10.512.5 1.5 0.200.35 0.030 K81550 1035 CS 0.15 1.5 9.2d-10.9 0.050 aUnlisted elements are governed by ASTM A276/A276M for Austenitic and Duplex stainless steel products listed in Table 1. bSingle values are maximum weight percentages except where
35、 noted. cThese alloys have a single producer. d Minimum Cr value of 9.2 percent in Alloy Type 1035 CS steel, as specified in ASTM A1035/A1035M, has been demonstrated to conform to T 373M/T 373 requirements for ratio of polarization resistance (Rp) and pitting potential. 2017 by the American Associat
36、ion of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS 4f M 334M/M 334-6 AASHTO 7. REQUIREMENTS FOR DEFORMATIONS 7.1. Deformations shall be spaced along the bar at substantially uniform distances. The deformations on opposite sides of t
37、he 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 degrees. Where the line of deformations forms an included angle with the axis of the bar from 45 to 70 degrees inclusive, the
38、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 deformation is greater than 70 degrees, a reversal in direction is not required. 7.3. The average spacing or distance between defor
39、mations 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 12.5 percent of the nominal perimeter of the bar. Wh
40、ere 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 percent of the nominal perimeter of the bar; furthermore, the summation of gap
41、s 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. 7.5. The spacing, height, and gap of deformations shall conform to the requirements prescribed in Table 2 Table 3. Table 2Deformed Bar Designation Numbers, No
42、minal Masses, Nominal Dimensions, and Deformation Requirements, SI Units Bar Designation No.aNominal Mass, kg/m Nominal DimensionsbDeformation Requirements, mm Diameter, mm Cross-Sectional Area, mm2Perimeter, mm Maximum Average Spacing Minimum Average Height Maximum Gap (Chord of 12.5% of Nominal Pe
43、rimeter) 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 1.27 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 1
44、2.4 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 aBar numbers approximate the number of millimeters of the nominal diameter of the bar. bThe nominal dimensions of a deformed bar are equivalent to those of a plain round bar ha
45、ving the same mass per meter as the deformed bar. 2017 by the American Association of State Highway and Transportation Officials.All rights reserved. Duplication is a violation of applicable law.TS 4f M 334M/M 334-7 AASHTO Table 3Deformed Bar Designation Numbers, Nominal Weights, Nominal Dimensions,
46、 and Deformation Requirements, U.S. Customary Units Bar Designation No.aNominal Weight, lb/ft Nominal DimensionsbDeformation Requirements, in. Diameter, in. Cross-Sectional Area, in.2Perimeter, in. Maximum Average Spacing Minimum Average Height Maximum Gap (Chord of 12.5% of Nominal Perimeter) 3 0.3
47、76 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 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
48、.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 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 aBar numbers are based on the number of eighths of an inch included in the nominal diameter of the bars. bThe nominal dimensions of
49、a deformed bar are equivalent to those of a plain round bar having the same weight per foot as the deformed bar. 8. MEASUREMENTS OF DEFORMATIONS 8.1. 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 measurement. The measurement shall begin from a point on a deformation at the beginning of the first space to a corresponding
