ASTM A709 A709M-2017e1 Standard Specification for Structural Steel for Bridges.pdf

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1、Designation: A709/A709M 171Standard 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 revision. A number i

2、n parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1NOTETable 3 was corrected editorially in June 2018.1. Scope*1.1 This specification covers carbon and high-strength low-alloy steel structural shapes, plat

3、es, and bars, quenched andtempered alloy steel, and stainless steel for structural platesintended for use in bridges. Eight 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 34

4、550CR 345CR 50 345HPS 70W HPS 485W 70 485HPS 100W HPS 690W 100 6901.1.1 Grades 36 250, 50 345, 50S 345S, 50W 345W,and 50CR 345CR are also included in Specifications A36/A36M, A572/A572M, A992/A992M, A588/A588M, andA1010/A1010M (UNS S41003), respectively. When the re-quirements of Table 10 or Table 1

5、1 or the supplementaryrequirements of this specification are specified, they exceed therequirements of Specifications A36/A36M, A572/A572M,A992/A992M, A588/A588M, and A1010/A1010M (UNSS41003). Product availability is shown in Table 1.1.1.2 Grades 50W 345W, 50CR 345CR, HPS 50W HPS345W, HPS 70W HPS 48

6、5W, and HPS 100W HPS 690Whave enhanced atmospheric corrosion resistance (see 13.1.2).Product availability is shown in Table 1.1.2 Grade HPS 70W HPS 485W or HPS 100W HPS690W shall not be substituted for Grades 36 250, 50 345,50S 345S, 50W 345W, or HPS 50W HPS 345W. Grade50W 345W, or HPS 50W HPS 345W

7、shall not be substi-tuted for Grades 36 250, 50 345 or 50S 345S withoutagreement between the purchaser and the supplier.1.3 When the steel is to be welded, it is presupposed that awelding procedure suitable for the grade of steel and intendeduse or service will be utilized. See Appendix X3 of Specif

8、ica-tion A6/A6M for information on weldability.1.4 For structural products to be used as tension componentsrequiring notch toughness testing, standardized requirementsare provided in this standard, and they are based uponAmerican Association of State Highway and TransportationOfficials (AASHTO) requ

9、irements for both fracture critical andnon-fracture critical members.1.5 Supplementary requirements are available but shallapply only if specified in the purchase order.1.6 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach sys

10、tem may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.7 For structural products produced from coil and fur-nished without heat treatment or with stress relieving only, th

11、eadditional requirements, including additional testing require-ments and the reporting of additional test results, of Specifi-cation A6/A6M apply.1.8 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on

12、 Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requirements for RolledStructural Steel Bars, Plates, S

13、hapes, and Sheet PilingA36/A36M Specification for Carbon Structural SteelA370 Test Methods and Definitions for Mechanical Testingof Steel Products1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of Subcom

14、mitteeA01.02 on Structural Steel for Bridges, Buildings, Rolling Stock and Ships.Current edition approved Sept. 1, 2017. Published September 2017. Originallyapproved in 1974. Last previous edition approved in 2016 as A709/A709M 16a.DOI: 10.1520/A0709_A0709M-17E01.2For referenced ASTM standards, visi

15、t the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 10

16、0 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and R

17、ecommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1A572/A572M Specification for High-Strength Low-AlloyColumbium-Vanadium Structural SteelA588/A588M Specification for High-Strength Low-AlloyStructural Steel, up to 50 ksi 345 MPa Minimum YieldPoint, wit

18、h Atmospheric Corrosion ResistanceA673/A673M Specification for Sampling Procedure for Im-pact Testing of Structural SteelA992/A992M Specification for Structural Steel ShapesA1010/A1010M Specification for Higher-Strength Marten-sitic Stainless Steel Plate, Sheet, and StripTABLE 1 Tensile and Hardness

19、 RequirementsANOTE 1Where “. . .” appears in this table, there is no requirement.GradePlate Thickness,in. mmStructural ShapeFlange or LegThickness, in. mmYield Point orYield Strength,Bksi MPaTensile Strength, ksiMPaMinimum Elongation, %Reductionof AreaC,Dmin, %Plates and BarsC, EShapesE8 in. or200 m

20、m2 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 50 345 min 65 450 min 18 21 18 21F.50S 345SGall 5065345450H,I65 450Hmin . . 18 21 .50W 345WandHPS 50WHPS

21、 345Wto 4 100, incl all 50 345 min 70 485 min 18 21 18 21J.50CR 345CR to 2 50, inclG50 345 min 70 485 min 18 21 . . .HPS 70WHPS 485 Wto 4 100, inclG70 485 minB85110 585760 . 19K. . .HPS 100WHPS 690Wto 212 65, inclG100 690 minB110130 760895 . 18K. .Lover 212 to 465 to 100, inclMG90 620 minB100130 690

22、895 . 16K. .LASee specimen orientation and preparation subsection in the Tension Tests section of Specification A6/A6M.BMeasured at 0.2 % offset or 0.5 % extension under load as described in Section 13 of Test Methods A370.CElongation and reduction of area not required to be determined for floor pla

23、tes.DFor plates wider than 24 in. 600 mm, the reduction of area requirement, where applicable, is reduced by five percentage points.EFor plates wider than 24 in. 600 mm, the elongation requirement is reduced by two percentage points. See elongation requirement adjustments in the Tension Testssection

24、 of Specification A6/A6M.FElongation in 2 in. or 50 mm: 19 % for shapes with flange thickness over 3 in. 75 mm.GNot applicable.HThe yield to tensile ratio shall be 0.87 or less for shapes that are tested from the web location; for all other shapes, the requirement is 0.85.IA maximum yield strength o

25、f 70 ksi 480 MPa is permitted for structural shapes that are required to be tested from the web location.JFor wide flange shapes with flange thickness over 3 in. 75 mm, elongation in 2 in. or 50 mm of 18 % minimum applies.KIf measured on the Fig. 3 (Test Methods A370)112-in. 40mm wide specimen, the

26、elongation is determined in a 2-in. or 50-mm gage length that includes the fractureand shows the greatest elongation.L40 % minimum applies if measured on the Fig 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 sp

27、ecimen.MNot applicable to Fracture Critical Tension Components (see Table 11).TABLE 2 Grade 36 250 Chemical Requirements (Heat Analysis)NOTE 1Where “. . .” appears in this table there is no requirement. The heat analysis for manganese shall be determined and reported as describedin the Heat Analysis

28、 section of Specification A6/A6M.Product Thickness,in. mmShapesAAllPlates 15 in. 380 mm WidthBBars, Plates #15 in. 380 mm WidthBTo34 20,inclOver34 to 11220 to 40, inclOver 112 to 21240 to 65, inclOver 212 to465to 100, inclTo34 20, inclOver34 to 11220 to 40, inclOver 112 to 440 to 100,inclCarbon, max

29、, % 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 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

30、0.40 maxCopper, min, % whencopper steel is specified0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20AManganese content of 0.85 to 1.35 % and silicon content of 0.15 to 0.40 % is required for shapes with flange thickness over 3 in. 75 mm.BFor each reduction of 0.01 % below the specified carbon maximum, an inc

31、rease of 0.06 % manganese above the specified maximum will be permitted up to a maximumof 1.35 %.A709/A709M 1712G101 Guide for Estimating the Atmospheric Corrosion Re-sistance of Low-Alloy SteelsTABLE 3 Grade 50 345 Chemical RequirementsA(Heat Analysis)Maximum Diameter,Thickness, or DistanceBetween

32、Parallel Faces,in. mmCarbon,max, %Manganese,Bmax, %Phosphorus,Cmax, %Sulfur,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 and

33、Shapes withflange thicknessover 3 in. 75 mm,%4 100 0.23 1.35 0.030 0.030 0.40 0.150.40 See Table 4Editorially corrected.ACopper when specified shall have a minimum content of 0.20 % by heat analysis (0.18 % by product analysis).BManganese, minimum by heat analysis of 0.80 % (0.75 % by product analys

34、is) shall be required for all plates over38 in. 10 mm in thickness; a minimum of 0.50 %(0.45 % by product analysis) shall be required for plates38 in. 10 mm and less in thickness, and for all other products. The manganese to carbon ratio shall not be lessthan 2 to 1. For each reduction of 0.01 perce

35、ntage 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 %.CA maximum phosphorus content of 0.04 % and a maximum sulfur content of 0.05 % are permitted for the following materials: Structural shape

36、s Bars Plates with widths up to and including 15 in. 380 mmDSilicon content in excess of 0.40 % by heat analysis must be negotiated.EColumbium and niobium are interchangeable names for the same element.TABLE 4 Grade 50 345 Alloy ContentTypeAElements Heat Analysis, %1 Columbium (niobium)B0.0050.05C2

37、Vanadium 0.010.15D3 Columbium (niobium)B0.0050.05CVanadium 0.010.15DColumbium (niobium)Bplus vanadium0.020.15EAAlloy content shall be in accordance with Type 1, 2, or 3 and the contents of theapplicable elements shall be reported on the test report.BColumbium and niobium are interchangeable names fo

38、r the same element.CProduct analysis limits = 0.004 to 0.06 %.DProduct analysis limits = 0.005 to 0.17 %.EProduct analysis limits = 0.01 to 0.16 %.TABLE 5 Grade 50CR 345CR Chemical Requirements (HeatAnalysis)NOTE 1Where “. . .” appears in this table there is no requirement.Element Composition, %Carb

39、on 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 maxA709/A709M 17133. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 fracture critical membera main load-carrying ten-sion member or t

40、ension component of a bending memberwhose failure would be expected to cause collapse of astructure or bridge without multiple, redundant load paths.3.1.2 main load-carrying membera steel member de-signed to carry primary design loads, including dead, live,impact, and other loads.3.1.3 non-fracture

41、critical membera main load-carryingmember whose failure would not be expected to cause collapseof a structure or bridge with multiple, redundant load paths.3.1.4 non-tension componenta steel member that is not intension under any design loading.3.1.5 secondary membera steel member used for aligninga

42、nd bracing of main load-carrying members, or for attachingutilities, signs, or other items to them, but not to directlysupport primary design loads3.1.6 tension componenta part or element of a fracturecritical or non-fracture critical member that is in tension undervarious design loadings.4. Orderin

43、g Requirements4.1 In addition to the items listed in the ordering informa-tion section of Specification A6/A6M, the following itemsshould be considered if applicable:4.1.1 Type of component (tension or non-tension, fracturecritical or non-fracture critical) (see Section 10).4.2 Impact testing temper

44、ature zone (see Table 9).5. General Requirements for Delivery5.1 Structural products furnished under this specificationshall conform to the requirements of the current edition ofSpecification A6/A6M, for the specific structural productordered, unless a conflict exists in which case this specificatio

45、nshall prevail.5.2 Coils are excluded from qualification to this specifica-tion until they are processed into a finished structural product.Structural products produced from coil means structural prod-ucts that have been cut to individual lengths from a coil. Theprocessor directly controls, or is re

46、sponsible for, the operationsinvolved in the processing of a coil into a finished structuralproduct. Such operations include decoiling, leveling orstraightening, hot-forming or cold-forming (if applicable),TABLE 6 Grade 50W 345 W Chemical Requirements (HeatAnalysis)NOTE 1Types A and B are equivalent

47、 to Specification A588/A588M,Grades A and B, respectively.ElementComposition, %AType A Type BCarbonB0.19 max 0.20 maxManganeseB0.801.25 0.751.35PhosphorusC0.030 max 0.030 maxSulfurC0.030 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 0.200.40V

48、anadium 0.020.10 0.010.10AWeldability data for these types have been qualified by FHWA for use in bridgeconstruction.BFor 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 %.CA maximum phosphorus content 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 mmTABLE 7 Grades HPS 50W HPS 345W and HPS 70WHPS 485 W, and HPS