1、Designation: A709/A709M 16aA709/A709M 17Standard Specification forStructural Steel for Bridges1This standard is issued under the fixed designation A709/A709M; the number immediately following the designation indicates the yearof original adoption or, in the case of revision, the year of last revisio
2、n. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This specification covers carbon and high-strength low-alloy steel structural shapes, plates, and bars and bars, quenched andtemp
3、ered alloy steel, and stainless steel for structural plates intended for use in bridges. SevenEight grades are available in fouryield strength levels as follows:Grade U.S. SI Yield Strength, ksi MPa36 250 36 25050 345 50 34550S 345S 50 34550W 345W 50 345HPS 50W HPS 345W 50 34550CR 345CR 50 345HPS 70
4、W HPS 485W 70 485HPS 100W HPS 690W 100 6901.1.1 Grades 36 250, 50 345, 50S 345S, and 50W 345W50W 345W, and 50CR 345CR are also included inSpecifications A36/A36M, A572/A572M, A992/A992M, and A588/A588M, and A1010/A1010M (UNS S41003), respectively.When the requirements of Table 910 or Table 1011 or t
5、he supplementary requirements of this specification are specified, theyexceed the requirements of Specifications A36/A36M, A572/A572M, A992/A992M, A588/A588Mand , and A588/A588MA1010/A1010M (UNS S41003). Product availability is shown in Table 1.1.1.2 Grades 50W 345W, 50CR 345CR, HPS 50W HPS 345W, HP
6、S 70W HPS 485W, and HPS 100W HPS 690W haveenhanced atmospheric corrosion resistance (see 13.1.2). Product availability is shown in Table 1.1.2 Grade HPS 70W HPS 485W or HPS 100W HPS 690W shall not be substituted for Grades 36 250, 50 345, 50S345S, 50W 345W, or HPS 50W HPS 345W. Grade 50W 345W, or HP
7、S 50W HPS 345W shall not be substituted forGrades 36 250, 50 345 or 50S 345S without agreement between the purchaser and the supplier.1.3 When the steel is to be welded, it is presupposed that a welding procedure suitable for the grade of steel and intended useor service will be utilized. See Append
8、ix X3 of Specification A6/A6M for information on weldability.1.4 For structural products to be used as tension components requiring notch toughness testing, standardized requirements areprovided in this standard, and they are based upon American Association of State Highway and Transportation Offici
9、als(AASHTO) requirements for both fracture critical and non-fracture critical members.1.5 Supplementary requirements are available but shall apply only if specified in the purchase order.1.6 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The value
10、s stated in eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with the standard.1.7 For structural products produced from coil and furnished without heat treatment or with stres
11、s relieving only, the additionalrequirements, including additional testing requirements and the reporting of additional test results, of Specification A6/A6M apply.1.8 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in
12、the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.1 This specification is under the jurisdiction ofASTM Committee A01 on Steel, Stainless Steel and RelatedAlloys and
13、is the direct responsibility of Subcommittee A01.02on Structural Steel for Bridges, Buildings, Rolling Stock and Ships.Current edition approved May 1, 2016Sept. 1, 2017. Published May 2016September 2017. Originally approved in 1974. Last previous edition approved in 2016 asA709/A709M 16.A709/A709M 1
14、6a. DOI: 10.1520/A0709_A0709M-16A.10.1520/A0709_A0709M-17.This 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 technically possible to adequately depict all change
15、s 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 standardCopyright ASTM International, 100 Barr
16、Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1TABLE 1 Tensile and Hardness RequirementsANOTE 1Where “. . .” appears in this table, there is no requirement.Grade Plate Thickness,in. mmStructural ShapeFlange or LegThickness, in. mmYield Point orYield Strength,Bksi MPaTensi
17、le Strength, ksiMPaMinimum Elongation, %Reductionof AreaC,Dmin, %Plates and BarsC, E ShapesE8 in. or200 mm2 in. or 50mm8 in. or200 mm2 in. or 50mm36 250 to 4 100, incl to 3 in. 75 mm, incl 36 250 min 5880 400550 20 23 20 21 .over 3 in. 75 mm 36 250 min 58 400 min . . 20 19 .50 345 to 4 100, incl all
18、 50 345 min 65 450 min 18 21 18 21F .50S 345S G all 5065345450H,I65 450H min . . 18 21 .50W 345WandHPS 50WHPS 345Wto 4 100, incl all 50 345 min 70 485 min 18 21 18 21J .50CR 345CR to 2 50, incl G 50 345 min 70 485 min 18 21 . . .HPS 70WHPS 485 Wto 4 100, incl G 70 485 minB 85110 585760 . 19K . . .HP
19、S 100WHPS 690Wto 212 65, incl G 100 690 minB 110130 760895 . 18K . . Lover 212 to 465 to 100, inclMG 90 620 minB 100130 690895 . 16K . . LA See specimen orientation and preparation subsection in the Tension Tests section of Specification A6/A6M.B Measured at 0.2 % offset or 0.5 % extension under loa
20、d as described in Section 13 of Test Methods A370.C Elongation and reduction of area not required to be determined for floor plates.D For plates wider than 24 in. 600 mm, the reduction of area requirement, where applicable, is reduced by five percentage points.E For plates wider than 24 in. 600 mm,
21、the elongation requirement is reduced by two percentage points. See elongation requirement adjustments in the Tension Testssection of Specification A6/A6M.F Elongation in 2 in. or 50 mm: 19 % for shapes with flange thickness over 3 in. 75 mm.G Not applicable.H The yield to tensile ratio shall be 0.8
22、7 or less for shapes that are tested from the web location; for all other shapes, the requirement is 0.85.I A maximum yield strength of 70 ksi 480 MPa is permitted for structural shapes that are required to be tested from the web location.J For wide flange shapes with flange thickness over 3 in. 75
23、mm, elongation in 2 in. or 50 mm of 18 % minimum applies.K If measured on the Fig. 3 (Test Methods A370) 112-in. 40mm wide specimen, the elongation is determined in a 2-in. or 50-mm gage length that includes the fractureand shows the greatest elongation.L 40 % minimum applies if measured on the Fig
24、3 (Test Methods A370) 112-in. 40-mm wide specimen; 50 % minimum applies if measured on the Fig. 4 (Test MethodsA370) 12-in. 12.5-mm round specimen.M Not applicable to Fracture Critical Tension Components (see Table 1011).TABLE 2 Grade 36 250 Chemical Requirements (Heat Analysis)NOTE 1Where “. . .” a
25、ppears in this table there is no requirement. The heat analysis for manganese shall be determined and reported as describedin the Heat Analysis section of Specification A6/A6M.Product Thickness,in. mm ShapesA AllPlates 15 in. 380 mm WidthB Bars, Plates #15 in. 380 mm WidthBTo 34 20,inclOver 34 to 11
26、220 to 40, inclOver 112 to 21240 to 65, inclOver 212 to 4 65to 100, incl To 34 20, inclOver 34 to 11220 to 40, inclOver 112 to 440 to 100,inclCarbon, max, % 0.26 0.25 0.25 0.26 0.27 0.26 0.27 0.28Manganese, % . . 0.801.20 0.801.20 0.851.20 . 0.600.90 0.600.90Phosphorus, max, % 0.04 0.030 0.030 0.030
27、 0.030 0.04 0.04 0.04Sulfur, max, % 0.05 0.030 0.030 0.030 0.030 0.05 0.05 0.05Silicon, % 0.40 max 0.40 max 0.40 max 0.150.40 0.150.40 0.40 max 0.40 max 0.40 maxCopper, min, % whencopper steel is specified0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20A Manganese content of 0.85 to 1.35 % and silicon conten
28、t of 0.15 to 0.40 % is required for shapes with flange thickness over 3 in. 75 mm.B For each reduction of 0.01 % below the specified carbon maximum, an increase of 0.06 % manganese above the specified maximum will be permitted up to a maximumof 1.35 %.A709/A709M 1722. Referenced Documents2.1 ASTM St
29、andards:2A6/A6M Specification for General Requirements for Rolled Structural Steel Bars, Plates, Shapes, and Sheet PilingA36/A36M Specification for Carbon Structural SteelA370 Test Methods and Definitions for Mechanical Testing of Steel ProductsA572/A572M Specification for High-Strength Low-Alloy Co
30、lumbium-Vanadium Structural SteelA588/A588M Specification for High-Strength Low-Alloy Structural Steel, up to 50 ksi 345 MPa Minimum Yield Point, withAtmospheric Corrosion Resistance2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.or
31、g. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.TABLE 3 Grade 50 345 Chemical RequirementsA (Heat Analysis)Maximum Diameter,Thickness, or DistanceBetween Parallel Faces,in. mmCarbon,max, %Manganese,Bmax, %Phosphorus,Cmax, %Phos
32、phorus,Cmax, %SiliconDColumbium(Niobium),EVanadium,and NitrogenPlates to 112-in.40-mm Thick,Shapes with flangeor leg thickness to3 in. 75 mminclusive, SheetPiling, Bars, Zees,and Rolled Tees,max, %Plates Over 112-in.40-mm Thick andShapes withflange thicknessover 3 in. 75 mm,%Columbium,Vanadium,and N
33、itrogenMaximum Diameter,Thickness, or DistanceBetween Parallel Faces,in. mmCarbon,max, %Manganese,Bmax, %Phosphorus,Cmax, %Sulfur,Cmax, %Plates to 112-in.4 100 0.23 1.35 0.030 0.030 0.40 0.150.40 See Table 4A Copper when specified shall have a minimum content of 0.20 % by heat analysis (0.18 % by pr
34、oduct analysis).B Manganese, minimum by heat analysis of 0.80 % (0.75 % by product analysis) shall be required for all plates over 38 in. 10 mm in thickness; a minimum of 0.50 %(0.45 % by product analysis) shall be required for plates 38 in. 10 mm and less in thickness, and for all other products. T
35、he manganese to carbon ratio shall not be lessthan 2 to 1. For each reduction of 0.01 percentage point below the specified carbon maximum, an increase of 0.06 percentage point manganese above the specifiedmaximum is permitted, up to a maximum of 1.60 %.C A maximum phosphorus content of 0.04 % and a
36、maximum sulfur content of 0.05 % are permitted for the following materials: Structural shapes Bars Plates with widths up to and including 15 in. 380 mmD Silicon content in excess of 0.40 % by heat analysis must be negotiated.E Columbium and niobium are interchangeable names for the same element.TABL
37、E 4 Grade 50 345 Alloy ContentTypeA Elements Heat Analysis, %1 Columbium 0.0050.05B1 Columbium (niobium)B 0.0050.05C2 Vanadium 0.010.15C2 Vanadium 0.010.15D3 Columbium 0.0050.05B3 Columbium (niobium)B 0.0050.05CVanadium 0.010.15CVanadium 0.010.15DColumbiumplus vanadium0.020.15DColumbium (niobium)Bpl
38、us vanadium0.020.15E5 Titanium 0.0060.04Nitrogen 0.0030.015Vanadium 0.06 maxA Alloy content shall be in accordance with Type 1, 2, 3, or 53 and the contents ofthe applicable elements shall be reported on the test report.B Columbium and niobium are interchangeable names for the same element.C Product
39、 analysis limits = 0.004 to 0.06 %.D Product analysis limits = 0.005 to 0.17 %.E Product analysis limits = 0.01 to 0.16 %.A709/A709M 173A673/A673M Specification for Sampling Procedure for Impact Testing of Structural SteelA992/A992M Specification for Structural Steel ShapesA1010/A1010M Specification
40、 for Higher-Strength Martensitic Stainless Steel Plate, Sheet, and StripG101 Guide for Estimating the Atmospheric Corrosion Resistance of Low-Alloy SteelsTABLE 5 Grade 50CR 345CR Chemical Requirements (HeatAnalysis)NOTE 1Where “. . .” appears in this table there is no requirement.Element Composition
41、, %Carbon 0.030 maxManganese 1.50 maxPhosphorus 0.040 maxSulfur 0.010 maxSilicon 1.00 maxNickel 1.50 maxChromium 10.5 12.5Molybdenum . . .Nitrogen 0.030 maxTABLE 56 Grade 50W 345 W Chemical Requirements (HeatAnalysis)NOTE 1Types A and B are equivalent to Specification A588/A588M,Grades A and B, resp
42、ectively.Element Composition, %AType A Type BCarbonB 0.19 max 0.20 maxManganeseB 0.801.25 0.751.35PhosphorusC 0.030 max 0.030 maxSulfurC 0.030 max 0.030 maxSilicon 0.300.65 0.150.50Nickel 0.40 max 0.50 maxChromium 0.400.65 0.400.70Copper 0.250.40 0.200.40Vanadium 0.020.10 0.010.10A Weldability data
43、for these types have been qualified by FHWA for use in bridgeconstruction.B For each reduction of 0.01 percentage point below the specified maximum forcarbon, an increase of 0.06 percentage point above the specified maximum formanganese is permitted, up to a maximum of 1.50 %.CAmaximum phosphorus co
44、ntent of 0.04 % and a maximum sulfur content of 0.05% are permitted for the following materials: Structural shapes Bars Plates with widths up to and including 15 in. 380 mmA709/A709M 1743. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 fracture critical membera main load-carryin
45、g tension member or tension component of a bending member whose failurewould be expected to cause collapse of a structure or bridge without multiple, redundant load paths.TABLE 67 Grades HPS 50W HPS 345W and HPS 70WHPS 485 W, and HPS 100W HPS 690W Chemical Requirements(Heat Analysis)NOTE 1Where “. .
46、 .” appears in this table, there is no requirement.ElementComposition, %GradesHPS 50WHPS 345W,HPS 70WHPS 485WGradeHPS 100WHPS 690WCarbon 0.11 max 0.08 maxManganese2.5 in. 65 mm and under 1.101.35 0.951.50Over 2.5 in. 65 mm 1.101.50 0.951.50Phosphorus 0.020 max 0.015 maxSulfurA 0.006 max 0.006 maxSil
47、icon 0.300.50 0.150.35Copper 0.250.40 0.901.20Nickel 0.250.40 0.650.90Chromium 0.450.70 0.400.65Molybdenum 0.020.08 0.400.65Vanadium 0.040.08 0.040.08Columbium (Niobium) . . . 0.010.03Columbium (niobium)B . . . 0.010.03Aluminum 0.0100.040 0.0200.050Nitrogen 0.015 max 0.015 maxA The steel shall be ca
48、lcium treated for sulfide shape control.B Columbium and niobium are interchangeable names for the same element.TABLE 7 Grade 50S 345S Chemical Requirements(Heat Analysis)Element Composition, %Carbon, max 0.23Manganese 0.50 to 1.60ASilicon, max 0.40Vanadium, max 0.15BColumbium, max 0.05BPhosphorus, max 0.035Sulfur, max 0.045Copper, max 0.60Nickel, max 0.45Chromium, max 0.35Molybdenum, max 0.15TABLE 8 Grade 50S 345S Chemical Requirements(Heat Analysis)Element Composition, %Carbon, max 0.23Manganese 0.50 to 1.60ASilicon, max 0.40Va
