1、Designation: A 490M 09aStandard Specification forHigh-Strength Steel Bolts, Classes 10.9 and 10.9.3, forStructural Steel Joints (Metric)1This standard is issued under the fixed designation A 490M; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、 of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope*1.1 This speci
3、fication covers two types of quenched andtempered alloy steel, metric heavy hex structural bolts havinga tensile strength of 1040 to 1210 MPa.1.2 These bolts are intended for use in structural connec-tions comparable to those covered under the requirements ofthe Specification for Structural Joints U
4、sing ASTM A325 andA490 bolts, approved by the Research Council on StructuralConnections; endorsed by the American Institute of SteelConstruction and by the Industrial Fastener Institute.21.3 The bolts are furnished in nominal bolt diameters M12to M36, inclusive. They are designated by type denotingc
5、hemical composition as follows:Type DescriptionType 1 Medium carbon alloy steelType 2 Withdrawn in 2002Type 3 Weathering steel1.4 This specification is applicable to metric heavy hexstructural bolts and alternate designs as established by theResearch Council in its publication, Specification for Str
6、ucturalJoints Using ASTM A325 and A490 bolts.1.5 For inch-pound bolts, see Specification A490.1.6 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.7 The following safety hazards caveat pertains only to theTest Methods portion,
7、Section 13, of this specification: Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions
8、prior to use.2. Referenced Documents2.1 ASTM Standards:3A325 Specification for Structural Bolts, Steel, Heat Treated,120/105 ksi Minimum Tensile StrengthA490 Specification for Structural Bolts, Alloy Steel, HeatTreated, 150 ksi Minimum Tensile StrengthA490M Specification for High-Strength Steel Bolt
9、s, Classes10.9 and 10.9.3, for Structural Steel Joints (Metric)A563M Specification for Carbon and Alloy Steel Nuts(Metric)A751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsD3951 Practice for Commercial PackagingE384 Test Method for Microindentation Hardness of Mat
10、e-rialsE709 Guide for Magnetic Particle TestingE1444 Practice for Magnetic Particle TestingF436M Specification for Hardened Steel Washers (Metric)F568M Specification for Carbon and Alloy Steel ExternallyThreaded Metric Fasteners (Metric)F606M Test Methods for Determining the MechanicalProperties of
11、Externally and Internally Threaded Fasteners,Washers, and Rivets (Metric)F788/F788M Specification for Surface Discontinuities ofBolts, Screws, and Studs, Inch and Metric SeriesF959M Specification for Compressible-Washer-Type DirectTension Indicators for Use With Structural Fasteners (Met-ric)F1136M
12、Specification for Zinc/Aluminum Corrosion Pro-tective Coatings for Fasteners (Metric)F1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF1789 Terminology for F16 Mechanical FastenersF2328M Test Method for Determining Decarburization andCarburization i
13、n Hardened and Tempered Threaded SteelBolts, Screws and Studs (Metric)1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.02 on Steel Bolts,Nuts, Rivets and Washers.Current edition approved Nov. 1, 2009. Published Decem
14、ber 2009. Originallyapproved in 1982. Last previous edition approved in 2009 as A 490M 09.DOI:10.1520/A0490M-09A.2Available from American Institute of Steel Construction (AISC), One E.Wacker Dr., Suite 700, Chicago, IL 60601-2001, http:/www.aisc.org3For referenced ASTM standards, visit the ASTM webb
15、iest, 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 webbiest.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International, 100 Barr Harb
16、or Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.G101 Guide for Estimating the Atmospheric CorrosionResistance of Low-Alloy Steels2.2 ASME Standards:4B1.13M Metric Screw ThreadsB18.2.3.7M Metric Heavy Hex Structural BoltsB18.24 Part Identifying Number (PIN) Code System Stan-dar
17、d for B18 Fastener Products2.3 ISO Standards:47412 Hexagon Bolts for High Strength StructuralBolting With Large Width Across Flats (Short ThreadLength)Product Grade CProperty Classes 8.8 and 10.92.4 IFI Standard5:IFI 144 Test Evaluation Procedures for Coating Qualifica-tion Intended for Use on High-
18、Strength Structural Bolts3. Terminology3.1 Terms used in this specification are defined in Termi-nology F1789, unless otherwise defined herein.4. Ordering Information4.1 Orders for bolts under this specification shall include thefollowing (see Note 1):4.1.1 Quantity (number of pieces of bolts and ac
19、cessories);4.1.2 Size, including nominal bolt diameter, thread pitch,and bolt length;4.1.3 Name of product: metric heavy hex structural bolts;4.1.4 Type of bolt (Type 1 or 3). When type is not specified,either Type 1 or Type 3 shall be furnished at the suppliersoption;4.1.5 ASTM designation and year
20、 of issue;4.1.6 Other components such as nuts, washers, and washer-type direct tension indicators, if required;4.1.7 Certification, if required (see Section 16); and4.1.8 Protective Coating per Specification F1136M, Grade3, if required. See 5.3.4.1.9 Special requirements, if required.4.1.10 For esta
21、blishment of a part identifying system, seeASME B18.24.NOTE 1A typical ordering description follows: 1000 pieces M24 3 33 100 mm long, heavy hex structural bolt, Type 1, ASTM A 490 M 03;each with two hardened washers, ASTM F436M, Type 1; and one heavyhex nut, ASTM A563M, Grade DH.4.2 Recommended Nut
22、s4.2.1 Nuts conforming to the requirements of SpecificationA563M are the recommended nuts for use with SpecificationA 490M heavy hex structural bolts. The nuts shall be of theclass and have a surface finish for each type of bolt as follows.Bolt Type and Finish Nut Class and Finish1, plain (uncoated)
23、 A563M10S, 10S3, plain (uncoated)1, coated in accordance withF1136M, Grade 3A563M10S, 10S3coated in accordance withF1136M, Grade 53, weathering steel A563M10S3, weathering steel4.3 Recommended Washers4.3.1 Washers conforming to Specification F436M are therecommended washers for use with Specificatio
24、n A490Mheavy hex structural bolts. The washers shall have a surfacefinish for each type of bolt as follows.Bolt Type and Finish Washer Finish1, plain (uncoated) plain (uncoated)1, coated in accordance withF1136M, Grade 3coated in accordance withF1136M, Grade 33, weathering steel weathering steel4.4
25、Other Accessories4.4.1 When compressible washer type tension indicators arespecified to be used with these bolts, they shall conform toSpecification F959M, Type 10.9.5. Materials and Manufacture5.1 Heat TreatmentType 1 and Type 3 bolts shall be heattreated by quenching in oil from the austenitic tem
26、perature andthen tempered by reheating to a temperature of not less than425C.5.2 ThreadingThe threads shall be cut or rolled.5.3 Protective Coatings:5.3.1 When a protective coating is required and specified,the bolts shall be coated with Zinc/Aluminum CorrosionProtective Coatings in accordance with
27、F1136M Grade 3,which has been qualified in accordance with IFI 1446.5.3.2 No other metallic coatings are permitted unless autho-rized by Committee F16. Future consideration of any coating4Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave.,
28、 New York, NY 10016-5990, http:/www.asme.org.5Available form Industrial Fastener Institute (IFI), 6363 Oak tree Boulevard,Independence. OH 44131, www.industrial-fasteners.org.6Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:F1610
29、01.TABLE 1 Chemical Requirements for Type 1 BoltsElement Heat Analysis, % ProductAnalysis, %CarbonFor sizes through M30 0.300.48 0.280.50For size M36 0.350.53 0.330.55Phosphorus, max 0.040 0.045Sulfur, max 0.040 0.045Alloying Elements See 6.1 TABLE 2 Chemical Requirements for Type 3 BoltsElement Hea
30、t Analysis, % Product Analysis, %CarbonSizes M20 and smaller 0.200.53 0.190.55Sizes larger than M20. 0.300.53 0.280.55Manganese, min 0.40 0.37Phosphorus, max 0.035 0.040Sulfur, max 0.040 0.045Copper 0.200.60 0.170.63Chromium, min 0.45 0.42Nickel, minor0.20 0.17Molybdenum, min 0.15 0.14A 490M 09a2wil
31、l be based on a review of test results submitted to Commit-tee F16 in accordance with the requirements of IFI 144.6. Chemical Composition6.1 Type 1 bolts shall be alloy steel conforming to thechemical composition requirements in Table 1. The steel shallcontain sufficient alloying elements to qualify
32、 it as an alloysteel (see Note 2).NOTE 2Steel is considered to be alloy, by theAmerican Iron and SteelInstitute, when the maximum of the range given for the content of alloyingelements exceeds one or more of the following limits: manganese, 1.65 %;silicon, 0.60 %; copper, 0.60 %; or in which a defin
33、ite range or a definiteminimum quantity of any of the following elements is specified orrequired within the limits of the recognized field of constructional alloysteels: aluminum, chromium up to 3.99 %, cobalt, columbium, molybde-num, nickel, titanium, tungsten, vanadium, zirconium, or any otherallo
34、ying elements added to obtain a desired alloying effect.6.2 Type 3 bolts shall be weathering steel conforming to thechemical composition requirements in Table 2. See GuideG101 for methods of estimating the atmospheric corrosionresistance of low alloy steel.6.3 Product analyses made on finished bolts
35、 representingeach lot shall conform to the product analysis requirementsspecified in Table 1 or Table 2, as applicable.6.4 Applications of heats of steel to which bismuth, sele-nium, tellurium, or lead has been intentionally added shall notbe permitted for bolts. Compliance with this requirement sha
36、llbe based on a statement on the steel certificate indicating thatthese elements were not intentionally added.6.5 Chemical analyses shall be performed in accordancewith Test Methods, Practices, and Terminology A751.7. Mechanical Properties7.1 HardnessThe bolts shall conform to the hardnessspecified
37、in Table 3.7.2 Tensile Properties:7.2.1 Except as permitted in 7.2.2 for long bolts and 7.2.3for short bolts, nominal bolt diameters M24 and smaller havinga length of 214 D and longer, and nominal bolt diameters largerthan M24 having a length of 3D and longer shall be wedgetested full size and shall
38、 conform to the minimum wedgetensile load, and proof load or alternative proof load specifiedin Table 4. The load achieved during proof load testing shall beequal to or greater than the specified proof load.7.2.2 When the length of the bolt makes full-size testingimpractical, machined specimens shal
39、l be tested and shallconform to the requirements specified in Table 5. When boltsare tested by both full-size and machined specimen methods,the full-size test shall take precedence.7.2.3 Nominal bolt diameters M24 and smaller having alength shorter than 214 D down to 2D inclusive, which cannotbe wed
40、ge tensile tested shall be axially tension tested full sizeand shall conform to the minimum tensile load and proof loador alternate proof load specified in Table 4. Nominal boltdiameters M24 and smaller having a length shorter than 2Dwhich cannot be axially tensile tested shall be qualified on theba
41、sis of hardness.7.2.4 For bolts on which both hardness and tension tests areperformed, acceptance based on tensile requirements shall takeprecedence in the event of low hardness readings.8. Carburization/Decarburization8.1 DefinitionThis test is intended to evaluate the pres-ence or absence of carbu
42、rization and decarburization as deter-mined by the difference in microhardness near the surface andcore.8.2 Requirements:8.2.1 CarburizationThe bolts shall show no evidence of acarburized surface when evaluated in accordance with thehardness methods established in Test Method F2328M.8.2.2 Decarburiz
43、ationHardness value differences shallnot exceed the requirements set forth for decarburization inTest Method F2328M materials.8.3 ProcedureTesting for carburization/decarburizationshall be performed in accordance with the microhardness(referee) methods established in Test Method F2328M.9. Dimensions
44、9.1 Head and Body:9.1.1 The bolts shall conform to the dimensions for heavyhex structural bolts specified in ASME B18.2.3.7M for nomi-nal bolt diameter M16 to M36 inclusive and ISO 7412 for sizeM12.9.2 Threads:9.2.1 Threads shall Metric Coarse Thread Series as specifiedin ASME B1.13M, and shall have
45、 Grade 6g tolerance.9.2.2 The thread length shall not be changed from thatspecified for heavy hex structural bolts in ASME B18.2.3.7Mand ISO 7412 in 9.1.1. Bolts requiring thread lengths otherthan those required by this specification shall be ordered underSpecification F568M, Class 10.9 and 10.9.3.1
46、0. Workmanship10.1 The allowable limits, inspection, and evaluation of thesurface discontinuities, quench cracks, forging cracks, headbursts, shear bursts, seams, folds, thread laps, voids, toolmarks, nicks, and gouges shall be in accordance with Specifi-cation F788/F788M.11. Magnetic Particle Inspe
47、ction for LongitudinalDiscontinuities and Transverse Cracks11.1 Requirements:11.1.1 Each sample representative of the lot shall be mag-netic particle inspected for longitudinal discontinuities andtransverse cracks.TABLE 3 Hardness Requirements for Bolt SizesM12 to M36 InclusiveNominal BoltDiameter,
48、mmLengthABrinell Rockwell Cmin max min maxM12 to M24, Less than 2D 311 352 33 39inclusive 2D and longer . . . 352 . . . 39Over M24 to M36, Less than 3D 311 352 33 39inclusive 3D and longer . . . 352 . . . 39AHeavy hex structural bolts M24 and smaller and shorter than 2D are subjectonly to minimum an
49、d maximum hardness. Heavy hex structural bolts larger thanM24 to M36 inclusive and shorter than 3D are subject only to minimum andmaximum hardness.A 490M 09a311.1.2 The lot, as represented by the sample, shall be freefrom nonconforming bolts, as defined in 11.3, when inspectedin accordance with 11.2-11.2.4.11.2 Inspection Procedure:11.2.1 The inspection sample shall be selected at randomfrom each lot in accordance with Table 6 and examined forlongitudinal discontinuities and transverse cracks.11.2.2 Magnetic particle inspection shall be conducted
